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boundary="_000_ZRAP278MB01254626C0D5014568B7E515892E0ZRAP278MB0125CHEP_" Content-Language: en-US --_000_ZRAP278MB01254626C0D5014568B7E515892E0ZRAP278MB0125CHEP_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Ketan, Thanks a lot for the feedback. So far Sergey feedbacked in favor to keep IE= 46 and SrSidType being separate. Lets see which opinion others have on the = list. * Also, from an operational perspective (looking holistically), we have= LSP ping/trace tools specified for MPLS (including SR segments/labels) to = verify/validate consistency between forwarding and control plane to determi= ne which protocol/label is being used and lot's more details. I am well aware on MPLS OAM. And indeed gives additional insights. There is= a difference from a data plane viewpoint between packets traversing the MP= LS domain vs. packets being generated within the MPLS domain though. Speaki= ng from past maintenance windows, probing with MPLS OAM gave Swisscom limit= ed insights into the MPLS data plane due to the amount of probes possible w= ithin a 1-2 minute time frame and above mentioned constraints. IPFIX was mi= ssion critical in validating within minutes to understand if data plane cha= nges was affecting the forwarding according the intend by using IE ingressI= nterface, egressInterface, mplsTopLabelIPv4Address, mplsTopLabelStackSecti= on and ForwardingStatus. This of course requires a big data infrastructure = to make the data instantly accessible. Best Wishes Thomas From: Ketan Talaulikar (ketant) Sent: Tuesday, August 18, 2020 4:23 PM To: Graf Thomas, INI-NET-DCF ; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Thanks for your response. Let us also wait for inputs from others in the WG= s. One small bit. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. KT2> The proposal to extend IE46 will cover the "sr-prefer" scenario and in= dicate whether the forwarding is happening with SR or LDP label. IMHO OSPF = SR vs ISIS SR is perhaps not as useful? Also, from an operational perspective (looking holistically), we have LSP p= ing/trace tools specified for MPLS (including SR segments/labels) to verify= /validate consistency between forwarding and control plane to determine whi= ch protocol/label is being used and lot's more details. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 18 August 2020 18:28 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the feedback. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? Thomas> I am open to this approach to change IE46 to include segment types = for RFC8402. I understand your concern to add additional fields. I would ap= preciate feedback from the wg if that is the path we like to go. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... Thomas> Correct [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? Thomas> See feedback above. [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thomas> Absolutely. I fully agree on your feedback. We need to have the min= imum possible in order to have a clear view about the MPL-SR forwarding. Si= nce IPFIX using UDP for transport, without the possibility of fragmentation= , we need to be careful as well not to add many more dimension's/fields. Best Wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Monday, August 17, 2020 8:51 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Please check inline below. From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 11:31 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, * This helps identification of specific SR-MPLS segment types as well a= s differentiating them from LDP, RSVP-TE, etc. To be precise, the existing MPLS Label Type identifier differentiates from = LDP, RSVP-TE. Not the new SrSidType IPFIX IE being proposed. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? * What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? It is important to distinguish between intend and result. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? If you migrate from one label distribution protocol to another, a network o= perator want's to understand if the data plane is still forwarding packets = with the label distribution protocol which needs to be removed or not. IE46= enables that by looking at the result of the forwarded traffic and not at = the intend. RFC 8661 section 3, https://tools.ietf.org/html/rfc8661#section= -3, describes the context. [KT] Sure, so adding the SR Segments to IE46, one can check whether the tra= ffic forwarding is happening using LDP or SR labels at any link in the netw= ork. * What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? Quote from RFC8402. "Segment Routing (SR) leverages the source routing para= digm". Means that not the routing protocol does all the forwarding decision= s, the node can change the forwarding by pushing additional labels. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... With IPFIX SrSidType we are able to cover this dimension in IPFIX. Enabling= to analyze the result of this decision. The example with " Adjacency SID o= r a LAN Adjacency SID" is not very useful because the difference of the two= is the topology among the adjacency. If you compare " Adjacency SID with P= refix SID", that makes much more sense. Since it describes that a particula= r adjacency is chosen to forward the packet instead of a prefix. If IE 89, = ForwardingStatus is drop, we understand that result of that decision lead t= o the drop and this enables to narrow down forwarding issues in segment rou= ting networks more efficiently and quickly. [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? * am asking for WG to weigh the implementation complexities For the WG and me, I would be important if you can describe more detailed w= hat you mean with implementation complexities. I would like to have a bette= r understanding where your fear is coming from. I would appreciate if you c= ould differentiate between MPLS Label Type identifier, IE46, from which lab= el protocol the label was coming from and SrSidType which SID type was used= . [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thanks, Ketan Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Saturday, August 15, 2020 7:09 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, I should have been more clear in my email. The proposal/suggestion is to add the following to the IPFIX MPLS Label typ= e identifier registry: * SR Prefix SID * SR Adjacency SID * SR Binding SID * SR BGP Peering SID * ... and so on This helps identification of specific SR-MPLS segment types as well as diff= erentiating them from LDP, RSVP-TE, etc. And my questions were: 1. What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? 2. What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? I am asking for WG to weigh the implementation complexities and overheads w= ith the proposed details of SR-MPLS segments in IPFIX against the benefit (= if any) that they provide for the flow analysis and monitoring. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 09:40 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the review and feedback. * What or how much value be there on determining whether a SR Prefix SI= D was signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters = and is more important is that it is a Prefix SID. Hardly any deployments wo= uld be running multiple protocols and learning the same prefix from differe= nt IGPs. As Jeff already pointed out. Multiple IGP labelling protocols are used in = networks when migrations are ongoing. Usually in a life cycle. Migrating fr= om LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swisscom = when we first discovered this shortcoming in vendor implementations. The ke= y point here, with these additional IPFIX MPLS Label Type identifiers we en= able the possibility to verify the label protocol migration without taking = the label value into the consideration. * IPFIX may be picking this information from a FIB in some implementati= on where the protocol does not matter and this information is not available= therein. I am not sure if you have seen the presentation in IETF 108 at OPSAWG and S= PRING. https://www.ietf.org/proceedings/108/slides/slides-108-opsawg-export-of-mpl= s-sr-label-type-information-in-ipfix-00.pdf Slide 2 shows Cisco as example vendor which implemented IE 46, MPLS Label T= ype identifier. There is an open ddts where vendor feasibility has been cla= rified. Ping me off the list when you like to have more details. I do understand your point that not all the vendors are capable to implemen= t IE 46. But that's not the point about the IPFIX IE registry. The IE regis= try enables that an IPFIX implementation can refer to the right code point.= With RFC 5102 the decision has been made that MPLS Label Type identifier m= ake sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type just= extends the IE 46 registry with the Segment Routing label protocol code po= ints so when OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, the= IPFIX implementation can point to the right code point. * On some nodes, the same Prefix SID may be learnt via both BGP and IGP= - what would we use/show? In this case the IE 46 shows the label protocol which was used to program t= he FIB. * For that table proposal, it is very difficult and in some cases not p= ossible to different between Prefix and Node and Anycast SID. Many of these= types are control plane elements and we can be sure more get added. I fully agree. As a network operator its still hard to understand the archi= tecture and constraints within a router. When monitoring capabilities are d= iscussed at IETF, this is the usual topic. What is possible, what make sens= e. By purpose, all available SID types are listed in the draft. This with t= he aim to start the discussion in the working groups what is possible what = makes sense. I would be interested to get your and also Jeff's feedback. In above mentioned slides I described how TI-LFA application would benefit = of visibility in the FIB by showing where Adj-SID was used. This should be = a simple example why it make sense not only to look at which label protocol= was used to forward a particular packet, but also which SID type to furthe= r understand the intend why this label is being pushed. I hope this makes all sense. Looking forward for reply. Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Friday, August 14, 2020 7:35 PM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; SPRING WG > Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type < also copying Spring WG for their review/inputs > Hi Thomas/All, I have reviewed the draft and would like to share a different perspective. What or how much value be there on determining whether a SR Prefix SID was = signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters and is= more important is that it is a Prefix SID. Hardly any deployments would be= running multiple protocols and learning the same prefix from different IGP= s. IPFIX may be picking this information from a FIB in some implementation = where the protocol does not matter and this information is not available th= erein. On some nodes, the same Prefix SID may be learnt via both BGP and IGP - wha= t would we use/show? I would recommend using SR Prefix SID, SR Adjacency SID, SR Binding SID, SR= BGP Peering SID and so on ... for the MPLS Label Type. This also takes away the need for the second table that is being proposed t= o a large extent. For that table proposal, it is very difficult and in some= cases not possible to different between Prefix and Node and Anycast SID. M= any of these types are control plane elements and we can be sure more get a= dded. Is there really much value in differentiation between say an Adjacenc= y SID and LAN Adjacency SID? Could we evaluate the implementation overhead and complexity of this level = of categorization/information in IPFIX against their value in flow analysis= to perhaps consider a middle ground? Thanks, Ketan From: Lsr > On Behalf Of = Thomas.Graf@swisscom.com Sent: 31 July 2020 20:52 To: hannes@gredler.at Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Hannes, Thanks a lot for the feedback. Yes, makes completely sense. Will take it fo= r the next update.. Best Wishes Thomas From: Hannes Gredler > Sent: Wednesday, July 29, 2020 9:31 AM To: Graf Thomas, INI-NET-DCF > Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Thomas, I have one comment/suggestion to Paragraph 4 (IANA Considerations). Please add also a code point for BGP Prefix-SID - it's quite popular in DC = deployments. https://tools.ietf.org/html/rfc8669 thanks, /hannes On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote: Dear lsr, I presented the following draft Export of MPLS Segment Routing Label Type Information in IP Flow Informatio= n Export (IPFIX) https://tools.ietf.org/html/draft-tgraf-ipfix-mpls-sr-label-type-04 at the spring working group at IETF 108 yesterday https://www.ietf.org/proceedings/108/slides/slides-108-spring-ip-flow-infor= mation-export-ipfix-00.pdf and today at OPSAWG where I call for adoption. This draft adds additional segment routing code points for in the IANA IPFI= X registry for IS-IS, OPSFv2 and OPSF v3 and segment routing SID types to g= ain further insights into the MPLS-SR forwarding-plane. I have been asked to not only gather feedback from spring and opsawg but al= so from lsr and mpls working groups since these code points are related to = link state routing protocols and mpls data plane. I am looking forward to your feedback and input. Best Wishes Thomas Graf _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr --_000_ZRAP278MB01254626C0D5014568B7E515892E0ZRAP278MB0125CHEP_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Ketan,

 

Thanks a lot for = the feedback. So far Sergey feedbacked in favor to keep IE46 and SrSidType = being separate. Lets see which opinion others have on the list.

 =

  • Also, from = an operational perspective (looking holistically), we have LSP ping/trace t= ools specified for MPLS (including SR segments/labels) to verify/validate consistency between forwarding and control plane to det= ermine which protocol/label is being used and lot’s more details.

 =

I am well aware o= n MPLS OAM. And indeed gives additional insights. There is a difference fro= m a data plane viewpoint between packets traversing the MPLS domain vs. packets being generated within the MPLS domain though.= Speaking from past maintenance windows, probing with MPLS OAM gave Swissco= m limited insights into the MPLS data plane due to the amount of probes pos= sible within a 1-2 minute time frame and above mentioned constraints. IPFIX was mission critical in validating = within minutes to understand if data plane changes was affecting the forwar= ding according the intend by using IE ingressInterface, egressInterface, &n= bsp;mplsTopLabelIPv4Address, mplsTopLabelStackSection and ForwardingStatus. This of course requires a big data infrastructure to= make the data instantly accessible.

 =

Best Wishes<= /o:p>

Thomas=

 

From: Ketan Talaulikar (ketant) <ketant@ci= sco.com>
Sent: Tuesday, August 18, 2020 4:23 PM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hanne= s@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Thanks for your response. Let us also wait for inputs from others in = the WGs.

 

One small bit.

 

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

Thomas> "= admin distance" is one reason why one path is considered over another = from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

KT2> The proposal to extend IE46 will cover the “sr-prefer&#= 8221; scenario and indicate whether the forwarding is happening with SR or = LDP label. IMHO OSPF SR vs ISIS SR is perhaps not as useful?

 

Also, from an operational perspective (looking holistically), we have= LSP ping/trace tools specified for MPLS (including SR segments/labels) to = verify/validate consistency between forwarding and control plane to determine which protocol/label is being used and lot&= #8217;s more details.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 18 August 2020 18:28
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

Thank you very mu= ch for the feedback.

 =

[KT] Why not extend the existing IPFIX MPLS Label Type (value 4= 6) to add SR Prefix SID, SR Adjacency SID, SR Binding SID … (basicall= y the segment types from RFC8402)? It’s a simpler change to an existing element/field that makes it easier for routers, coll= ectors and analysers?

Thomas> I am o= pen to this approach to change IE46 to include segment types for RFC8402. I= understand your concern to add additional fields. I would appreciate feedback from the wg if that is the path we like to go.=

 =

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

Thomas> "= admin distance" is one reason why one path is considered over another = from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

 =

[KT] From the document, I= believe we are still talking only about the top of the stack label …=

Thomas> Correc= t

 =

[KT] My point is why do w= e need to introduce another ElementID and why not use the existing Type 46 = as suggested above?

Thomas> See fe= edback above.

 =

 =

[KT] To be clear, I am no= t talking from the POV of a specific implementation. Let me summarize my fe= edback and perspective:

  • Carefully consider the addition of more co= ntrol plane elements and nuances into IPFIX since they require all that add= itional context/information to be made available at the “layer” (or component) from where IPFIX picks= this info (traditionally from the “FIB”). This added informati= on should have a strong enough justification of benefit – e.g. How do= es difference between Adj SID and LAN Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” = of flow information collected and perhaps not everything needs to be determ= ined and reported by routers.

 =

Thomas> Absolu= tely. I fully agree on your feedback. We need to have the minimum possible = in order to have a clear view about the MPL-SR forwarding. Since IPFIX using UDP for transport, without the possibility of fragmentat= ion, we need to be careful as well not to add many more dimension's/fields.=

 =

Best Wishes<= /o:p>

Thomas=

 

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Monday, August 17, 2020 8:51 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Please check inline below.

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 11:31
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

  • This helps = identification of specific SR-MPLS segment types as well as differentiating= them from LDP, RSVP-TE, etc.

 =

To be precise, th= e existing MPLS Label Type identifier differentiates from LDP, RSVP-TE. Not= the new SrSidType IPFIX IE being proposed.

[KT] Why not extend the existing IPFIX MPLS Label Type (value 4= 6) to add SR Prefix SID, SR Adjacency SID, SR Binding SID … (basicall= y the segment types from RFC8402)? It’s a simpler change to an existing element/field that makes it easier for routers, coll= ectors and analysers?

 

  • What value = is provided for IPFIX analysis if the SR Prefix SID was being signalled via= OSPF or ISIS?

 

It is important t= o distinguish between intend and result.

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

 

If you migrate fr= om one label distribution protocol to another, a network operator want's to= understand if the data plane is still forwarding packets with the label distribution protocol which needs to be removed or = not. IE46 enables that by looking at the result of the forwarded traffic an= d not at the intend. RFC 8661 section 3, https://tools.ietf.org/html/rfc8661#section-3, describes the context.

[KT] Sure, so adding the SR Segments to IE46, one can check whe= ther the traffic forwarding is happening using LDP or SR labels at any link= in the network.

 

  • What value = is provided for IPFIX analysis if it was a Adjacency SID or a LAN Adjacency= SID?

 =

Quote from RFC840= 2. "Segment Routing (SR) leverages the source routing paradigm". = Means that not the routing protocol does all the forwarding decisions, the node can change the forwarding by pushing additional labels= .

[KT] From the document, I= believe we are still talking only about the top of the stack label …=

 

With IPFIX SrSidT= ype we are able to cover this dimension in IPFIX. Enabling to analyze the r= esult of this decision. The example with " Adjacency SID or a LAN Adjacency SID" is not very useful because the difference= of the two is the topology among the adjacency. If you compare " Adja= cency SID with Prefix SID", that makes much more sense. Since it descr= ibes that a particular adjacency is chosen to forward the packet instead of a prefix. If IE 89, ForwardingStatus is drop, we und= erstand that result of that decision lead to the drop and this enables to n= arrow down forwarding issues in segment routing networks more efficiently a= nd quickly.

[KT] My point is why do w= e need to introduce another ElementID and why not use the existing Type 46 = as suggested above?

 =

  • = am asking for WG to weigh the implementation complexities

 =

For the WG and me= , I would be important if you can describe more detailed what you mean with implementa= tion complexities. I would like to have a better understanding where your f= ear is coming from. I would appreciate if you could differentiate between MPLS Label Type identifier, IE46,= from which label protocol the label was coming from and SrSidType which SI= D type was used.

[KT] To be clear, I am no= t talking from the POV of a specific implementation. Let me summarize my fe= edback and perspective:

  • Carefully consider the addition of more co= ntrol plane elements and nuances into IPFIX since they require all that add= itional context/information to be made available at the “layer” (or component) from where IPFIX picks= this info (traditionally from the “FIB”). This added informati= on should have a strong enough justification of benefit – e.g. How do= es difference between Adj SID and LAN Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” = of flow information collected and perhaps not everything needs to be determ= ined and reported by routers.

 

Thanks,=

Ketan

 =

Best wishes<= /o:p>

Thomas=

 =

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Saturday, August 15, 2020 7:09 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

I should have been more clear in my email.

 

The proposal/suggestion is to add the following to the IPFIX MPLS Lab= el type identifier registry:

  • SR Prefix S= ID
  • SR Adjacency SID
  • SR Binding SID<= /li>
  • SR BGP = Peering SID
  • … and so on

 

This helps identification of specific SR-MPLS segment types as well a= s differentiating them from LDP, RSVP-TE, etc.

 

And my questions were:

  1. What value = is provided for IPFIX analysis if the SR Prefix SID was being signalled via= OSPF or ISIS?
  2. What value is provided for IPFIX analysis if it was a Adjacency= SID or a LAN Adjacency SID?

 

I am asking for WG to weigh the implementation complexities and overh= eads with the proposed details of SR-MPLS segments in IPFIX against the ben= efit (if any) that they provide for the flow analysis and monitoring.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 09:40
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

Thank you very mu= ch for the review and feedback.

 =

  • What or how= much value be there on determining whether a SR Prefix SID was signalled/p= rogrammed on a node via OSPFv2/OSPFv3/ISIS – what matters and is more important is that it is a Prefix SID. Har= dly any deployments would be running multiple protocols and learning the sa= me prefix from different IGPs.

 

As Jeff already pointed out. Mul= tiple IGP labelling protocols are used  in networks when migrations ar= e ongoing. Usually in a life cycle. Migrating from LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swisscom wh= en we first discovered this shortcoming in vendor implementations. The key = point here, with these additional IPFIX MPLS Label Type identifiers we enab= le the possibility to verify the label protocol migration without taking the label value into the considera= tion.

 

  • IPFIX may b= e picking this information from a FIB in some implementation where the prot= ocol does not matter and this information is not available therein.

 

I am not sure if you have seen t= he presentation in IETF 108 at OPSAWG and SPRING.

https://www.ie= tf.org/proceedings/108/slides/slides-108-opsawg-export-of-mpls-sr-label-typ= e-information-in-ipfix-00.pdf

 

Slide 2 shows Cisco as example v= endor which implemented IE 46, MPLS Label Type identifier. There is an open= ddts where vendor feasibility has been clarified. Ping me off the list when you like to have more details.=

 

I do understand y= our point that not all the vendors are capable to implement IE 46. But that= ’s not the point about the IPFIX IE registry. The IE registry enables that an IPFIX implementa= tion can refer to the right code point. With RFC 5102 the decision has been= made that MPLS Label Type identifier make sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type just extends = the IE 46 registry with the Segment Routing label protocol code points so w= hen OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, the IPFIX im= plementation can point to the right code point.

 

  • On some nod= es, the same Prefix SID may be learnt via both BGP and IGP – what wou= ld we use/show?

 =

In this case the = IE 46 shows the label protocol which was used to program the FIB.

 =

  • = For that table proposal, it is very difficult and in some cases not possibl= e to different between Prefix and Node and Anycast SID. Many of these types= are control plane elements and we can be sure more get added.
    • =

 =

I fully agree. As= a network operator its still hard to understand the architecture and const= raints within a router. When monitoring capabilities are discussed at IETF, this is the usual topic. What is possible, what mak= e sense. By purpose, all available SID types are listed in the draft. This = with the aim to start the discussion in the working groups what is possible= what makes sense. I would be interested to get your and also Jeff's feedback.

 =

In above mentione= d slides I described how TI-LFA application would benefit of visibility in = the FIB by showing where Adj-SID was used. This should be a simple example why it make sense not only to look at which lab= el protocol was used to forward a particular packet, but also which SID typ= e to further understand the intend why this label is being pushed.

 =

I hope this makes= all sense. Looking forward for reply.

 

Best wishes

Thomas

 

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Friday, August 14, 2020 7:35 PM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; SPRING WG <= spring@ietf.org>
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

< also copying Spring WG for their review/inputs >

 

Hi Thomas/All,

 

I have reviewed the draft and would like to share a different perspec= tive.

 

What or how much value be there on determining whether a SR Prefix SI= D was signalled/programmed on a node via OSPFv2/OSPFv3/ISIS – what ma= tters and is more important is that it is a Prefix SID. Hardly any deployments would be running multiple protocols and= learning the same prefix from different IGPs. IPFIX may be picking this in= formation from a FIB in some implementation where the protocol does not mat= ter and this information is not available therein.

 

On some nodes, the same Prefix SID may be learnt via both BGP and IGP= – what would we use/show?

 

I would recommend using SR Prefix SID, SR Adjacency SID, SR Binding S= ID, SR BGP Peering SID and so on … for the MPLS Label Type.

 

This also takes away the need for the second table that is being prop= osed to a large extent. For that table proposal, it is very difficult and i= n some cases not possible to different between Prefix and Node and Anycast SID. Many of these types are control p= lane elements and we can be sure more get added. Is there really much value= in differentiation between say an Adjacency SID and LAN Adjacency SID?

 

Could we evaluate the implementation overhead and complexity of this = level of categorization/information in IPFIX against their value in flow an= alysis to perhaps consider a middle ground?

 

Thanks,

Ketan

 

From: Lsr <lsr-bounces@iet= f.org> On Behalf Of Thomas.Graf= @swisscom.com
Sent: 31 July 2020 20:52
To: hannes@gredler.at
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Hannes,

 

Thanks a lot for = the feedback. Yes, makes completely sense. Will take it for the next update= ..

 =

Best Wishes<= /o:p>

Thomas=

 

 

From: Hannes Gredler <hannes@= gredler.at>
Sent: Wednesday, July 29, 2020 9:31 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Thomas,

 

I have one comment/suggestion to Paragraph 4 (IANA C= onsiderations).

 

Please add also a code point for BGP Prefix-SID - it= ’s quite popular in DC deployments.

 

thanks,

 

/hannes

 

On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote:

 

Dear lsr,

 

I presented the following draft=

 

Export of MPLS Segment Routing = Label Type Information in IP Flow Information Export (IPFIX)

 

at the spring working group at = IETF 108 yesterday

 

and today at OPSAWG where I cal= l for adoption.

 

This draft adds additional segm= ent routing code points for in the IANA IPFIX registry for IS-IS, OPSFv2 an= d OPSF v3 and segment routing SID types to gain further insights into the MPLS-SR forwarding-plane.

 

I have been asked to not only g= ather feedback from spring and opsawg but also from lsr and mpls working gr= oups since these code points are related to link state routing protocols and mpls data plane.

 

I am looking forward to your fe= edback and input.

 

Best Wishes

Thomas Graf

_______________________________________________ Lsr mailing list
Lsr@ietf.org<= /a>
https= ://www.ietf.org/mailman/listinfo/lsr

 

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--_000_ZRAP278MB01258847D06A7103FBEF03D5892E0ZRAP278MB0125CHEP_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Sergey, Thanks for the feedback. I am fully in line with your comment. * Maybe we should consider adding a generic type 'Segment Routing' w/o = extra details if this might become an implementation challenge? I would be interested to understand what extra details you would include in= this type. Potentially this could also apply to SRv6 (draft-patki-srv6-ipf= ix) * this seems to be significantly more complex to implement and arguably= IPFIX may not be the best way to collect this info. You probably are referring to draft-ietf-spring-sr-yang-22, collecting MPLS= -SR operational state information. Correct? https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-yang-22#section-= 8.3 As you know, TI-LFA pushing Adj-SID's in sub seconds, to take an example. F= rom a vendor perspective, do you think it is technically feasible to get th= e label number and SID type through YANG push and label number and packet d= etails from IPFIX within a time frame that the data can be correlated outsi= de the router to understand that TI-LFA affected the mpls data plane. I fea= r from past experience in data-collection, that this is quiet a challenge. = But I do also understand the constraints of IPFIX. Best Wishes Thomas From: Fomin, Sergey (Nokia - US/Mountain View) Sent: Monday, August 24, 2020 4:08 AM To: Ketan Talaulikar (ketant) ; Graf T= homas, INI-NET-DCF Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Ketan, all, While I tend to agree with Ketan that, in principle, specific control plane= protocol name might not be the most useful bit of info, I would argue that= it still makes more sense to keep IE46 in this format instead of replacing= it with srsidtype. I.e. treat IE46 as in 'control plane protocol that is t= he source/owner of a particular label in LIB/LFIB'. Maybe we should conside= r adding a generic type 'Segment Routing' w/o extra details if this might b= ecome an implementation challenge? I'm in favor of keeping SrSidType as a separate entity -> this seems to be = significantly more complex to implement and arguably IPFIX may not be the b= est way to collect this info. -- Sergey From: spring > On B= ehalf Of Ketan Talaulikar (ketant) Sent: Tuesday, August 18, 2020 7:23 AM To: Thomas.Graf@swisscom.com; hannes@gredl= er.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: Re: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Thanks for your response. Let us also wait for inputs from others in the WG= s. One small bit. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. KT2> The proposal to extend IE46 will cover the "sr-prefer" scenario and in= dicate whether the forwarding is happening with SR or LDP label. IMHO OSPF = SR vs ISIS SR is perhaps not as useful? Also, from an operational perspective (looking holistically), we have LSP p= ing/trace tools specified for MPLS (including SR segments/labels) to verify= /validate consistency between forwarding and control plane to determine whi= ch protocol/label is being used and lot's more details. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 18 August 2020 18:28 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the feedback. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? Thomas> I am open to this approach to change IE46 to include segment types = for RFC8402. I understand your concern to add additional fields. I would ap= preciate feedback from the wg if that is the path we like to go. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... Thomas> Correct [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? Thomas> See feedback above. [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thomas> Absolutely. I fully agree on your feedback. We need to have the min= imum possible in order to have a clear view about the MPL-SR forwarding. Si= nce IPFIX using UDP for transport, without the possibility of fragmentation= , we need to be careful as well not to add many more dimension's/fields. Best Wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Monday, August 17, 2020 8:51 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Please check inline below. From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 11:31 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, * This helps identification of specific SR-MPLS segment types as well a= s differentiating them from LDP, RSVP-TE, etc. To be precise, the existing MPLS Label Type identifier differentiates from = LDP, RSVP-TE. Not the new SrSidType IPFIX IE being proposed. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? * What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? It is important to distinguish between intend and result. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? If you migrate from one label distribution protocol to another, a network o= perator want's to understand if the data plane is still forwarding packets = with the label distribution protocol which needs to be removed or not. IE46= enables that by looking at the result of the forwarded traffic and not at = the intend. RFC 8661 section 3, https://tools.ietf.org/html/rfc8661#section= -3, describes the context. [KT] Sure, so adding the SR Segments to IE46, one can check whether the tra= ffic forwarding is happening using LDP or SR labels at any link in the netw= ork.. * What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? Quote from RFC8402. "Segment Routing (SR) leverages the source routing para= digm". Means that not the routing protocol does all the forwarding decision= s, the node can change the forwarding by pushing additional labels.. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... With IPFIX SrSidType we are able to cover this dimension in IPFIX. Enabling= to analyze the result of this decision. The example with " Adjacency SID o= r a LAN Adjacency SID" is not very useful because the difference of the two= is the topology among the adjacency. If you compare " Adjacency SID with P= refix SID", that makes much more sense. Since it describes that a particula= r adjacency is chosen to forward the packet instead of a prefix. If IE 89, = ForwardingStatus is drop, we understand that result of that decision lead t= o the drop and this enables to narrow down forwarding issues in segment rou= ting networks more efficiently and quickly. [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? * am asking for WG to weigh the implementation complexities For the WG and me, I would be important if you can describe more detailed w= hat you mean with implementation complexities. I would like to have a bette= r understanding where your fear is coming from. I would appreciate if you c= ould differentiate between MPLS Label Type identifier, IE46, from which lab= el protocol the label was coming from and SrSidType which SID type was used= . [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thanks, Ketan Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Saturday, August 15, 2020 7:09 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, I should have been more clear in my email. The proposal/suggestion is to add the following to the IPFIX MPLS Label typ= e identifier registry: * SR Prefix SID * SR Adjacency SID * SR Binding SID * SR BGP Peering SID * ... and so on This helps identification of specific SR-MPLS segment types as well as diff= erentiating them from LDP, RSVP-TE, etc. And my questions were: 1. What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? 2. What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? I am asking for WG to weigh the implementation complexities and overheads w= ith the proposed details of SR-MPLS segments in IPFIX against the benefit (= if any) that they provide for the flow analysis and monitoring. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 09:40 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the review and feedback. * What or how much value be there on determining whether a SR Prefix SI= D was signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters = and is more important is that it is a Prefix SID. Hardly any deployments wo= uld be running multiple protocols and learning the same prefix from differe= nt IGPs. As Jeff already pointed out. Multiple IGP labelling protocols are used in = networks when migrations are ongoing. Usually in a life cycle. Migrating fr= om LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swisscom = when we first discovered this shortcoming in vendor implementations. The ke= y point here, with these additional IPFIX MPLS Label Type identifiers we en= able the possibility to verify the label protocol migration without taking = the label value into the consideration. * IPFIX may be picking this information from a FIB in some implementati= on where the protocol does not matter and this information is not available= therein. I am not sure if you have seen the presentation in IETF 108 at OPSAWG and S= PRING. https://www.ietf.org/proceedings/108/slides/slides-108-opsawg-export-of-mpl= s-sr-label-type-information-in-ipfix-00.pdf Slide 2 shows Cisco as example vendor which implemented IE 46, MPLS Label T= ype identifier. There is an open ddts where vendor feasibility has been cla= rified. Ping me off the list when you like to have more details. I do understand your point that not all the vendors are capable to implemen= t IE 46. But that's not the point about the IPFIX IE registry. The IE regis= try enables that an IPFIX implementation can refer to the right code point.= With RFC 5102 the decision has been made that MPLS Label Type identifier m= ake sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type just= extends the IE 46 registry with the Segment Routing label protocol code po= ints so when OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, the= IPFIX implementation can point to the right code point. * On some nodes, the same Prefix SID may be learnt via both BGP and IGP= - what would we use/show? In this case the IE 46 shows the label protocol which was used to program t= he FIB. * For that table proposal, it is very difficult and in some cases not p= ossible to different between Prefix and Node and Anycast SID. Many of these= types are control plane elements and we can be sure more get added. I fully agree. As a network operator its still hard to understand the archi= tecture and constraints within a router. When monitoring capabilities are d= iscussed at IETF, this is the usual topic. What is possible, what make sens= e. By purpose, all available SID types are listed in the draft. This with t= he aim to start the discussion in the working groups what is possible what = makes sense. I would be interested to get your and also Jeff's feedback. In above mentioned slides I described how TI-LFA application would benefit = of visibility in the FIB by showing where Adj-SID was used. This should be = a simple example why it make sense not only to look at which label protocol= was used to forward a particular packet, but also which SID type to furthe= r understand the intend why this label is being pushed. I hope this makes all sense. Looking forward for reply. Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Friday, August 14, 2020 7:35 PM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; SPRING WG > Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type < also copying Spring WG for their review/inputs > Hi Thomas/All, I have reviewed the draft and would like to share a different perspective. What or how much value be there on determining whether a SR Prefix SID was = signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters and is= more important is that it is a Prefix SID. Hardly any deployments would be= running multiple protocols and learning the same prefix from different IGP= s. IPFIX may be picking this information from a FIB in some implementation = where the protocol does not matter and this information is not available th= erein. On some nodes, the same Prefix SID may be learnt via both BGP and IGP - wha= t would we use/show? I would recommend using SR Prefix SID, SR Adjacency SID, SR Binding SID, SR= BGP Peering SID and so on ... for the MPLS Label Type. This also takes away the need for the second table that is being proposed t= o a large extent. For that table proposal, it is very difficult and in some= cases not possible to different between Prefix and Node and Anycast SID. M= any of these types are control plane elements and we can be sure more get a= dded. Is there really much value in differentiation between say an Adjacenc= y SID and LAN Adjacency SID? Could we evaluate the implementation overhead and complexity of this level = of categorization/information in IPFIX against their value in flow analysis= to perhaps consider a middle ground? Thanks, Ketan From: Lsr > On Behalf Of = Thomas.Graf@swisscom.com Sent: 31 July 2020 20:52 To: hannes@gredler.at Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Hannes, Thanks a lot for the feedback. Yes, makes completely sense. Will take it fo= r the next update... Best Wishes Thomas From: Hannes Gredler > Sent: Wednesday, July 29, 2020 9:31 AM To: Graf Thomas, INI-NET-DCF > Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Thomas, I have one comment/suggestion to Paragraph 4 (IANA Considerations). Please add also a code point for BGP Prefix-SID - it's quite popular in DC = deployments. https://tools.ietf.org/html/rfc8669 thanks, /hannes On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote: Dear lsr, I presented the following draft Export of MPLS Segment Routing Label Type Information in IP Flow Informatio= n Export (IPFIX) https://tools.ietf.org/html/draft-tgraf-ipfix-mpls-sr-label-type-04 at the spring working group at IETF 108 yesterday https://www.ietf.org/proceedings/108/slides/slides-108-spring-ip-flow-infor= mation-export-ipfix-00.pdf and today at OPSAWG where I call for adoption. This draft adds additional segment routing code points for in the IANA IPFI= X registry for IS-IS, OPSFv2 and OPSF v3 and segment routing SID types to g= ain further insights into the MPLS-SR forwarding-plane. I have been asked to not only gather feedback from spring and opsawg but al= so from lsr and mpls working groups since these code points are related to = link state routing protocols and mpls data plane. I am looking forward to your feedback and input. Best Wishes Thomas Graf _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr --_000_ZRAP278MB01258847D06A7103FBEF03D5892E0ZRAP278MB0125CHEP_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Sergey,

 

Thanks for the fe= edback. I am fully in line with your comment.

 =

  • Maybe we should consider adding a generic type '= Segment Routing' w/o extra details if this might become an implementation c= hallenge?

 =

I would be intere= sted to understand what extra details you would include in this type. Poten= tially this could also apply to SRv6 (draft-patki-srv6-ipfix)

 =

  • this seems to be significan= tly more complex to implement and arguably IPFIX may not be the best way to= collect this info.

 =

You probably are = referring to draft-ietf-spring-sr-yang-22, collecting MPLS-SR operational s= tate information. Correct?

https://datatrack= er.ietf.org/doc/html/draft-ietf-spring-sr-yang-22#section-8.3

 =

As you know, TI-L= FA pushing Adj-SID's in sub seconds, to take an example. From a vendor pers= pective, do you think it is technically feasible to get the label number and SID type through YANG push and label number an= d packet details from IPFIX within a time frame that the data can be correl= ated outside the router to understand that TI-LFA affected the mpls data pl= ane. I fear from past experience in data-collection, that this is quiet a challenge. But I do also understa= nd the constraints of IPFIX.

 =

Best Wishes<= /o:p>

Thomas=

 =

From: Fomin, Sergey (Nokia - US/Mountain View) <sergey.fomin@nokia= .com>
Sent: Monday, August 24, 2020 4:08 AM
To: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.or= g>; Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org
Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas, Ketan, all,

 

While I tend to agree with Keta= n that, in principle, specific control plane protocol name might not be the= most useful bit of info, I would argue that it still makes more sense to k= eep IE46 in this format instead of replacing it with srsidtype. I.e. treat IE46 as in ‘control plane protocol tha= t is the source/owner of a particular label in LIB/LFIB’. Maybe we sh= ould consider adding a generic type 'Segment Routing' w/o extra details if = this might become an implementation challenge?

 

I'm in favor of keeping SrSidTy= pe as a separate entity -> this seems to be significantly more complex t= o implement and arguably IPFIX may not be the best way to collect this info= .

 

--

Serge= y

From: spring <spring-bo= unces@ietf.org> On Behalf Of Ketan Talaulikar (ketant)
Sent: Tuesday, August 18, 2020 7:23 AM
To: Thomas.Graf@swisscom= .com; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: Re: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Thanks for your response. Let u= s also wait for inputs from others in the WGs.

 

One small bit.

 

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

Thomas> "= admin distance" is one reason why one path is considered over another = from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

KT2> The proposal to extend = IE46 will cover the “sr-prefer” scenario and indicate whether t= he forwarding is happening with SR or LDP label. IMHO OSPF SR vs ISIS SR is= perhaps not as useful?

 

Also, from an operational persp= ective (looking holistically), we have LSP ping/trace tools specified for M= PLS (including SR segments/labels) to verify/validate consistency between f= orwarding and control plane to determine which protocol/label is being used and lot’s more details.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 18 August 2020 18:28
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

Thank you very mu= ch for the feedback.

 =

[KT] Why not extend the e= xisting IPFIX MPLS Label Type (value 46) to add SR Prefix SID, SR Adjacency= SID, SR Binding SID … (basically the segment types from RFC8402)? It= ’s a simpler change to an existing element/field that makes it easier for routers, collectors and analysers?=

Thomas> I am o= pen to this approach to change IE46 to include segment types for RFC8402. I= understand your concern to add additional fields. I would appreciate feedback from the wg if that is the path we like to go.=

 =

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

Thomas> "= admin distance" is one reason why one path is considered over another = from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

 =

[KT] From the document, I= believe we are still talking only about the top of the stack label …=

Thomas> Correc= t

 =

[KT] My point is why do w= e need to introduce another ElementID and why not use the existing Type 46 = as suggested above?

Thomas> See fe= edback above.

 =

 =

[KT] To be clear, I am no= t talking from the POV of a specific implementation. Let me summarize my fe= edback and perspective:

  • Carefully consider the addition of more co= ntrol plane elements and nuances into IPFIX since they require all that add= itional context/information to be made available at the “layer” (or component) from where IPFIX picks= this info (traditionally from the “FIB”). This added informati= on should have a strong enough justification of benefit – e.g. How do= es difference between Adj SID and LAN Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” = of flow information collected and perhaps not everything needs to be determ= ined and reported by routers.

 =

Thomas> Absolu= tely. I fully agree on your feedback. We need to have the minimum possible = in order to have a clear view about the MPL-SR forwarding. Since IPFIX using UDP for transport, without the possibility of fragmentat= ion, we need to be careful as well not to add many more dimension's/fields.=

 =

Best Wishes<= /o:p>

Thomas=

 

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Monday, August 17, 2020 8:51 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Please check inline below.=

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 11:31
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

  • This helps identification of specific SR-MPLS se= gment types as well as differentiating them from LDP, RSVP-TE, etc.

 =

To be precise, th= e existing MPLS Label Type identifier differentiates from LDP, RSVP-TE. Not= the new SrSidType IPFIX IE being proposed.

[KT] Why not extend the e= xisting IPFIX MPLS Label Type (value 46) to add SR Prefix SID, SR Adjacency= SID, SR Binding SID … (basically the segment types from RFC8402)? It= ’s a simpler change to an existing element/field that makes it easier for routers, collectors and analysers?=

 

  • What value is provided for IPFIX analysis if the= SR Prefix SID was being signalled via OSPF or ISIS?

 

It is important t= o distinguish between intend and result.

[KT] By giving different = types for OSPF and ISIS, is the intention to troubleshoot routing preferenc= e selection (done based on “admin distance” between protocol se= lection in RIB)?

 

If you migrate fr= om one label distribution protocol to another, a network operator want's to= understand if the data plane is still forwarding packets with the label distribution protocol which needs to be removed or = not. IE46 enables that by looking at the result of the forwarded traffic an= d not at the intend. RFC 8661 section 3, https://tools= .ietf.org/html/rfc8661#section-3, describes the context.

[KT] Sure, so adding the = SR Segments to IE46, one can check whether the traffic forwarding is happen= ing using LDP or SR labels at any link in the network..

 =

  • What value is provided for IPFIX analysis if it = was a Adjacency SID or a LAN Adjacency SID?

 =

Quote from RFC840= 2. "Segment Routing (SR) leverages the source routing paradigm". = Means that not the routing protocol does all the forwarding decisions, the node can change the forwarding by pushing additional labels= ..

[KT] From the document, I= believe we are still talking only about the top of the stack label …=

 

With IPFIX SrSidT= ype we are able to cover this dimension in IPFIX. Enabling to analyze the r= esult of this decision. The example with " Adjacency SID or a LAN Adjacency SID" is not very useful because the difference= of the two is the topology among the adjacency. If you compare " Adja= cency SID with Prefix SID", that makes much more sense. Since it descr= ibes that a particular adjacency is chosen to forward the packet instead of a prefix. If IE 89, ForwardingStatus is drop, we und= erstand that result of that decision lead to the drop and this enables to n= arrow down forwarding issues in segment routing networks more efficiently a= nd quickly.

[KT] My point is why do w= e need to introduce another ElementID and why not use the existing Type 46 = as suggested above?

 =

  • am asking for WG to weigh t= he implementation complexities

 =

For the WG and me= , I would be important if you can describe more detailed what you mean with implementation complexities. I would like to ha= ve a better understanding where your fear is coming from. I would appreciat= e if you could differentiate between MPLS Label Type identifier, IE46,= from which label protocol the label was coming from and SrSidType which SI= D type was used.

[KT] To be clear, I am no= t talking from the POV of a specific implementation. Let me summarize my fe= edback and perspective:

  • Carefully consider the addition of more co= ntrol plane elements and nuances into IPFIX since they require all that add= itional context/information to be made available at the “layer” (or component) from where IPFIX picks= this info (traditionally from the “FIB”). This added informati= on should have a strong enough justification of benefit – e.g. How do= es difference between Adj SID and LAN Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” = of flow information collected and perhaps not everything needs to be determ= ined and reported by routers.

 

Thanks,=

Ketan

 =

Best wishes<= /o:p>

Thomas=

 =

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Saturday, August 15, 2020 7:09 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

I should have been more clear i= n my email.

 

The proposal/suggestion is to a= dd the following to the IPFIX MPLS Label type identifier registry:

  • SR Prefix SID
  • SR Adjacency SID
  • SR Binding SID
  • SR BG= P Peering SID
  • … and = so on

 

This helps identification of sp= ecific SR-MPLS segment types as well as differentiating them from LDP, RSVP= -TE, etc.

 

And my questions were:

  1. What value is provided for IPFIX analysis if the= SR Prefix SID was being signalled via OSPF or ISIS?
  2. What value is provided fo= r IPFIX analysis if it was a Adjacency SID or a LAN Adjacency SID?

 

I am asking for WG to weigh the= implementation complexities and overheads with the proposed details of SR-= MPLS segments in IPFIX against the benefit (if any) that they provide for t= he flow analysis and monitoring.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 09:40
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 

Thank you very mu= ch for the review and feedback.

 =

  • What or how much value be there on determining w= hether a SR Prefix SID was signalled/programmed on a node via OSPFv2/OSPFv3= /ISIS – what matters and is more important is that it is a Prefix SID. Hardly any deployments would be running multip= le protocols and learning the same prefix from different IGPs.

 

As Jeff already pointed out. Mul= tiple IGP labelling protocols are used  in networks when migrations ar= e ongoing. Usually in a life cycle. Migrating from LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swisscom wh= en we first discovered this shortcoming in vendor implementations. The key = point here, with these additional IPFIX MPLS Label Type identifiers we enab= le the possibility to verify the label protocol migration without taking the label value into the considera= tion.

 

  • IPFIX may be picking this information from a FIB= in some implementation where the protocol does not matter and this informa= tion is not available therein.

 

I am not sure if you have seen t= he presentation in IETF 108 at OPSAWG and SPRING.

https://www.ietf.org/proceedings/108/slides/slides-108= -opsawg-export-of-mpls-sr-label-type-information-in-ipfix-00.pdf

 

Slide 2 shows Cisco as example v= endor which implemented IE 46, MPLS Label Type identifier. There is an open= ddts where vendor feasibility has been clarified. Ping me off the list when you like to have more details.=

 

I do understand y= our point that not all the vendors are capable to implement IE 46. But that= ’s not the point about the IPFIX IE registry. The IE registry enables that an IPFIX implementa= tion can refer to the right code point. With RFC 5102 the decision has been= made that MPLS Label Type identifier make sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type just extends = the IE 46 registry with the Segment Routing label protocol code points so w= hen OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, the IPFIX im= plementation can point to the right code point.

 

  • On some nodes, the same Prefix SID may be learnt= via both BGP and IGP – what would we use/show?

 =

In this case the = IE 46 shows the label protocol which was used to program the FIB.

 =

  • For that table proposal, it= is very difficult and in some cases not possible to different between Pref= ix and Node and Anycast SID. Many of these types are control plane elements= and we can be sure more get added.<= /span>

 =

I fully agree. As= a network operator its still hard to understand the architecture and const= raints within a router. When monitoring capabilities are discussed at IETF, this is the usual topic. What is possible, what mak= e sense. By purpose, all available SID types are listed in the draft. This = with the aim to start the discussion in the working groups what is possible= what makes sense. I would be interested to get your and also Jeff's feedback.

 =

In above mentione= d slides I described how TI-LFA application would benefit of visibility in = the FIB by showing where Adj-SID was used. This should be a simple example why it make sense not only to look at which lab= el protocol was used to forward a particular packet, but also which SID typ= e to further understand the intend why this label is being pushed.

 =

I hope this makes= all sense. Looking forward for reply.

 

Best wishes

Thomas

 

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Friday, August 14, 2020 7:35 PM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; SPRING WG <= spring@ietf.org>
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

< also copying Spring WG for= their review/inputs >

 

Hi Thomas/All,

 

I have reviewed the draft and w= ould like to share a different perspective.

 

What or how much value be there= on determining whether a SR Prefix SID was signalled/programmed on a node = via OSPFv2/OSPFv3/ISIS – what matters and is more important is that i= t is a Prefix SID. Hardly any deployments would be running multiple protocols and learning the same prefix from diff= erent IGPs. IPFIX may be picking this information from a FIB in some implem= entation where the protocol does not matter and this information is not ava= ilable therein.

 

On some nodes, the same Prefix = SID may be learnt via both BGP and IGP – what would we use/show?=

 

I would recommend using SR Pref= ix SID, SR Adjacency SID, SR Binding SID, SR BGP Peering SID and so on R= 30; for the MPLS Label Type.

 

This also takes away the need f= or the second table that is being proposed to a large extent. For that tabl= e proposal, it is very difficult and in some cases not possible to differen= t between Prefix and Node and Anycast SID. Many of these types are control plane elements and we can be sure mor= e get added. Is there really much value in differentiation between say an A= djacency SID and LAN Adjacency SID?

 

Could we evaluate the implement= ation overhead and complexity of this level of categorization/information i= n IPFIX against their value in flow analysis to perhaps consider a middle g= round?

 

Thanks,

Ketan

 

From: Lsr <lsr-bounces@iet= f.org> On Behalf Of Thomas.Graf= @swisscom.com
Sent: 31 July 2020 20:52
To: hannes@gredler.at
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Hannes,

 

Thanks a lot for = the feedback. Yes, makes completely sense. Will take it for the next update= ...

 =

Best Wishes<= /o:p>

Thomas=

 

 

From: Hannes Gredler <hannes@= gredler.at>
Sent: Wednesday, July 29, 2020 9:31 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Thomas,

 

I have one comment/suggestion to Paragraph 4 (IANA C= onsiderations).

 

Please add also a code point for BGP Prefix-SID - it= ’s quite popular in DC deployments.

 

thanks,

 

/hannes

 

On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote:

 

Dear lsr,

 

I presented the following draft=

 

Export of MPLS Segment Routing = Label Type Information in IP Flow Information Export (IPFIX)

 

at the spring working group at = IETF 108 yesterday

 

and today at OPSAWG where I cal= l for adoption.

 

This draft adds additional segm= ent routing code points for in the IANA IPFIX registry for IS-IS, OPSFv2 an= d OPSF v3 and segment routing SID types to gain further insights into the MPLS-SR forwarding-plane.

 

I have been asked to not only g= ather feedback from spring and opsawg but also from lsr and mpls working gr= oups since these code points are related to link state routing protocols and mpls data plane.

 

I am looking forward to your fe= edback and input.

 

Best Wishes

Thomas Graf

_______________________________________________ Lsr mailing list
Lsr@ietf.org<= /a>
https:/= /www.ietf.org/mailman/listinfo/lsr

 

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Sri Karthik Goud" To: "spring@ietf.org" CC: Swamy SRK Thread-Topic: PSP and USP uN Flavors Thread-Index: AdZ7Lz2AA+mT+DNyR32P99LVzfPpMQ== Date: Tue, 25 Aug 2020 22:30:01 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Enabled=true; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SetDate=2020-08-25T22:29:34Z; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Method=Privileged; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Name=106ee314-308e-4f40-a474-5b984ee7b7ff; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ActionId=98a14009-1467-4322-8d0e-f3eb7ac60356; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ContentBits=2 dlp-product: dlpe-windows dlp-version: 11.5.0.60 dlp-reaction: no-action authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=juniper.net; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Folks, In draft-filsfils-spring-net-pgm-extension-srv6-usid, a uN represents an in= struction (END, END.T) instantiated on a node. Can that instruction have a = PSP or USP flavor? If so, wouldn't the PSP/USP cause an SRH that has not ye= t been processed to be deleted? - Karthik Non-Juniper --_000_BYAPR05MB571845555884BBB8985EBB0CD5570BYAPR05MB5718namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Folks,

 

In draft-filsfils-spring-net-pgm-extension-srv6-usid= , a uN represents an instruction (END, END.T) instantiated on a node. Can t= hat instruction have a PSP or USP flavor? If so, wouldn’t the PSP/USP= cause an SRH that has not yet been processed to be deleted?

 

- Karthik

 


Non-Juniper

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Can that instruction have a = PSP or USP flavor? If so, wouldn't the PSP/USP cause an SRH that has not ye= t been processed to be deleted? -Karthik Juniper Business Use Only --_000_BYAPR05MB5718BA0D82F8FCA0E97C1C6BD5510BYAPR05MB5718namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

2nd try,

 

Folks,

 

In draft-filsfils-spring-net-pgm-extension-srv6-usid= , a uN represents an instruction (END, END.T) instantiated on a node. Can t= hat instruction have a PSP or USP flavor? If so, wouldn’t the PSP/USP= cause an SRH that has not yet been processed to be deleted?

 

-Karthik

 


Juniper Business= Use Only

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Tue, 1 Sep 2020 12:26:44 +0000 From: Rajesh M To: "Ketan Talaulikar (ketant)" , "gdawra.ietf@gmail.com" , "Clarence Filsfils (cfilsfil)" , "robert@raszuk.net" , "bruno.decraene@orange.com" , "zhuangshunwan@huawei.com" , "jorge.rabadan@nokia.com" CC: "spring@ietf.org" Thread-Topic: https://tools.ietf.org/html/draft-ietf-bess-srv6-services-04 Thread-Index: AdZ4MNW2XqUqDnZ6QwCVe2fsN6tJPwEDhcRQAAA2K+ABBnf/0A== Date: Tue, 1 Sep 2020 12:26:44 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-08-22T03:13:26Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=558e4b75-cfc5-4de3-87d0-5beb9c66ec74; 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boundary="_000_MN2PR05MB6080BF0F8829819566AEDD2ABE2E0MN2PR05MB6080namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB6080.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1171767d-8a67-46b7-c2c6-08d84e7249e6 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Sep 2020 12:26:44.4694 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: iwjI4UVsWMuUoV/tD0ugHstYeTkDcurYhES0Z0ncorJsMkJDzZ4pPtcADJudDGqVgpaRo1pQf8J8V856mcFOCw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB5968 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-01_08:2020-09-01, 2020-09-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 suspectscore=0 bulkscore=0 spamscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1011 priorityscore=1501 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009010108 Archived-At: Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-bess-srv6-services-04 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Sep 2020 12:27:05 -0000 --_000_MN2PR05MB6080BF0F8829819566AEDD2ABE2E0MN2PR05MB6080namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable May be I was not very clear. My only ask is we must Recommended "BGP next h= op and SRV6 service SID for a BGP route must be derived from the same locat= or" So that we no need to check the reachability to BGP nexthop and then check = the reachability to SRV6 service SID >From the draft section "5. BGP based L3 service over SRv6" When the egress PE sets the next-hop to a value that is not covered by the SRv6 Locator from which the SRv6 Service SID is allocated, then the ingress PE SHOULD perform reachability check for the SRv6 Service SID in addition to the BGP next-hop reachability procedures. Juniper Business Use Only From: spring > On B= ehalf Of Rajesh M Sent: Saturday, August 22, 2020 8:43 AM To: gdawra.ietf@gmail.com; cfilsfil@cisco.com= ; robert@raszuk.net; b= runo.decraene@orange.com; zhuangshunwan@h= uawei.com; jorge.rabadan@nokia.com Cc: spring@ietf.org Subject: [spring] https://tools.ietf.org/html/draft-ietf-bess-srv6-services= -04 [External Email. Be cautious of content] 5. BGP based L3 service over SRv6 When the egress PE sets the next-hop to a value that is not covered by the = SRv6 Locator from which the SRv6 Service SID is allocated, then the ingress PE SHOULD perform reachability check for the SRv6 Service = SID in addition to the BGP next-hop reachability procedures. I think we should mention, few points for egress side a) Recommended to set the bgp nexthop based upon locator. [KT] I would think that it is difficult to normatively recommend such a thi= ng in the spec. There would be implementation and deployment design aspects= to be considered. b) All the service SIDs across vrfs(DT4,DT6....) must be derived from the s= ame locator (this is independent of setting bgp nexthop) [KT] I am not sure such a restriction is required and in fact would be seve= rely limiting in nature. Consider that some service may wish to leverage a = FlexAlgo based on delay metric computation to get from the ingress to egres= s PE. In such cases, the egress PE can allocate the SRv6 SID for that servi= ce from its FlexAlgo specific locator. Thanks, Ketan Juniper Business Use Only --_000_MN2PR05MB6080BF0F8829819566AEDD2ABE2E0MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

May be I was not very clear. My= only ask is we must Recommended “BGP next hop and SRV6 service SID for a BGP = route must be derived from the same locator”

So that we no need to check the= reachability to BGP nexthop and then check the reachability to SRV6= service SID

 

From the draft section “5.  BGP based L3 = service over SRv6”

When the egress PE sets the next-hop to a value that is no= t covered

by the SRv6 Locator from which the SRv6 Service SID is all= ocated,

then the ingress PE SHOULD perform reachability check for = the SRv6

Service SID in addition to the BGP next-hop reachability p= rocedures.

 

 

 

 

Juniper Business Use Only

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

5.  BGP based L3 service over SRv6

When the egress PE sets the next-hop to a value that= is not covered by the SRv6 Locator from which the SRv6 Service SID is allo= cated,

then the ingress PE SHOULD perform reachability chec= k for the SRv6 Service SID in addition to the BGP next-hop reachability pro= cedures.

 

 

I think we should mention, few points for egress side=

a) Recommended to set the bgp nexthop based upon locator.<= o:p>

 

[KT] I would think that it is difficult to nor= matively recommend such a thing in the spec. There would be implementation = and deployment design aspects to be considered.

 

b) All the service SIDs across vrfs(DT4,DT6....) must be d= erived from the same locator (this is independent of setting bgp nexthop)

[KT] I am not sure such a restriction is requi= red and in fact would be severely limiting in nature. Consider that some se= rvice may wish to leverage a FlexAlgo based on delay metric computation to = get from the ingress to egress PE. In such cases, the egress PE can allocate the SRv6 SID for that service fr= om its FlexAlgo specific locator.

 

 

 

Thanks,

Ketan

 

Juniper Business Use Only

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aWxlIHByZXZlbnRpbmcgYW55DQogICBleHRlcm5hbCB0cmFmZmljIGZyb20gYWNjZXNzaW5nIG9y IGV4cGxvaXRpbmcgdGhlIFNSdjYtYmFzZWQNCiAgIHNlcnZpY2VzLiBBZGRpdGlvbmFsbHksIFJG Qzg3NTQgZGVmaW5lcyBhbiBITUFDIFRMViBwZXJtaXR0aW5nIG5vZGVzIGluIHRoZSBTUiBkb21h aW4gdG8gdmVyaWZ5IHRoYXQgdGhlIFNSSCBhcHBsaWVkIHRvIGEgcGFja2V0IHdhcyBzZWxlY3Rl ZCBieSBhbiBhdXRob3JpemVkIHBhcnR5IGFuZCB0byBlbnN1cmUgdGhhdCB0aGUgc2VnbWVudCBs aXN0IGlzIG5vdCBtb2RpZmllZCBhZnRlciBnZW5lcmF0aW9uLCBwcm92aWRpbmcgZnVydGhlciBw cm90ZWN0aW9uIGFnYWluc3QgYmFkIGFjdG9ycyB3aXRoaW4gdGhlIFNSIGRvbWFpbi4NCjwvTkVX Pg0KDQpBbHNvLCBpZiBJ4oCZbSBub3QgbWlzdGFrZW4sIHdoZW4gdGhlcmUgaXMganVzdCBvbmUg U0lEIHRoZW4gaXQgaXMgcGxhY2VkIGluIHRoZQ0KSVB2NiBEQSBhbmQgdGhlcmUgaXMgbm8gU1JI IGhlYWRlciBvciBITUFDIFRMVi4gDQoNCltQQ10gVGhlIFNSSCBNQVkgYmUgaW5jbHVkZWQgd2hl biB0aGVyZSBpcyBqdXN0IG9uZSBTSUQgaWYgZmxhZ3Mgb3IgVExWcyBhcmUgcmVxdWlyZWQgKFJG Qzg3NTQgc2VjdGlvbiA0LjEgcGFyYWdyYXBoIDEpIHNvIHRoZSBITUFDIFRMViBtYXkgYmUgdXNl ZCBpbiB0aGlzIGNhc2UuDQoNClRoaXMgaXMgYSBnZW5lcmFsIHByb2JsZW0gd2l0aCBlbnN1cmlu ZyB0aGF0IHRoZSBEQSBvbiBwYWNrZXRzIGFyZSBub3QgY2hhbmdlZCBpbiB0cmFuc2l0LCBhbmQg b25lIGNvdWxkIHVzZSBJUHNlYyB0byBtaXRpZ2F0ZSB0aGF0IGlzc3VlLiBJdOKAmXMgcHJvYmFi bHkgd29ydGh3aGlsZSBtZW50aW9uaW5nIHNvbWV0aGluZyBsaWtlIHRoYXQuDQoNCg0K From nobody Tue Sep 1 19:41:57 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F5123A0A90; Tue, 1 Sep 2020 19:41:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.791 X-Spam-Level: X-Spam-Status: No, score=-1.791 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com 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X-MS-Exchange-CrossTenant-Network-Message-Id: 70813504-3c82-4d56-8a09-08d84ee9ba6d X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Sep 2020 02:41:43.2723 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9QlI0N71y3kLUZHTWPPVdbL62rosA1I7VkCbO5e3HUZWq+i6tI7Q1FIhuyvSCAZCtXkOfjlrJw/xCPCserOusQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR08MB3959 Archived-At: Subject: Re: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Sep 2020 02:41:50 -0000 --_000_BYAPR08MB5493C2177F16E6ABD85E1EF4852F0BYAPR08MB5493namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Thomas, I've clarified a few points inline. Thank you, -- Sergey From: Thomas.Graf@swisscom.com Sent: Tuesday, September 1, 2020 12:55 AM To: Fomin, Sergey (Nokia - US/Mountain View) ; keta= nt=3D40cisco.com@dmarc.ietf.org Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Sergey, Thanks for the feedback. I am fully in line with your comment. * Maybe we should consider adding a generic type 'Segment Routing' w/o = extra details if this might become an implementation challenge? I would be interested to understand what extra details you would include in= this type. Potentially this could also apply to SRv6 (draft-patki-srv6-ipf= ix) [SF] On the contrary, here I meant without extra details. I think someone m= entioned that it might be challenging to put a protocol identifier there, s= o in such cases one option would be is to allow generic "Segment Routing" l= abel type (just to distinguish it from LDP/RSVP). But I'm not sure it is needed. Just an option. * this seems to be significantly more complex to implement and arguably= IPFIX may not be the best way to collect this info. You probably are referring to draft-ietf-spring-sr-yang-22, collecting MPLS= -SR operational state information. Correct? https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-yang-22#section-= 8.3 [SF] I'm not pointing in any specific direction, I believe there are multip= le ways to achieve this; each with its own set of pros and cons. E.g. an operator may decide to collect control plane information using tele= metry (yang push or openconfig gnmi or anything else) and any type of model= s (IETF, openconfig, vendor's proprietary), or go with BGP-LS, or put a sen= sor/NMS into an IGP domain, etc; and do a correlation with IPFIX statistics using an NMS at a later stage. O= r do a simple data enrichment in kafka or whatever pipeline they use for co= llecting, processing & storing the data. [SF] But I'm not against SrSidType in the current form. As you know, TI-LFA pushing Adj-SID's in sub seconds, to take an example. F= rom a vendor perspective, do you think it is technically feasible to get th= e label number and SID type through YANG push and label number and packet d= etails from IPFIX within a time frame that the data can be correlated outsi= de the router to understand that TI-LFA affected the mpls data plane. I fea= r from past experience in data-collection, that this is quiet a challenge. = But I do also understand the constraints of IPFIX. [SF] Could you elaborate a little bit on this or correct me if I'm missing = something? TI-LFA is a local action of re-programming the data plane, which you'll be = able to see in IPFIX (assuming enough amount traffic & sampling rate). Next= you only need to correlate a specific label to its type and the label itse= lf has relatively long lifespan (or could be static, depending on the node = config). I don't see how getting srsidtype via IPFIX or another method chan= ges anything here. Though you won't be able to automatically assume whether it was a TI-LFA ac= tion or some other traffic engineering mechanism (if you have mix of both i= n a network), and not any TI-LFA actions results in adj-sid push. Best Wishes Thomas From: Fomin, Sergey (Nokia - US/Mountain View) Sent: Monday, August 24, 2020 4:08 AM To: Ketan Talaulikar (ketant) ; Graf T= homas, INI-NET-DCF Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Ketan, all, While I tend to agree with Ketan that, in principle, specific control plane= protocol name might not be the most useful bit of info, I would argue that= it still makes more sense to keep IE46 in this format instead of replacing= it with srsidtype. I.e. treat IE46 as in 'control plane protocol that is t= he source/owner of a particular label in LIB/LFIB'. Maybe we should conside= r adding a generic type 'Segment Routing' w/o extra details if this might b= ecome an implementation challenge? I'm in favor of keeping SrSidType as a separate entity -> this seems to be = significantly more complex to implement and arguably IPFIX may not be the b= est way to collect this info. -- Sergey From: spring > On B= ehalf Of Ketan Talaulikar (ketant) Sent: Tuesday, August 18, 2020 7:23 AM To: Thomas.Graf@swisscom.com; hannes@gredl= er.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: Re: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Thanks for your response. Let us also wait for inputs from others in the WG= s. One small bit. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. KT2> The proposal to extend IE46 will cover the "sr-prefer" scenario and in= dicate whether the forwarding is happening with SR or LDP label. IMHO OSPF = SR vs ISIS SR is perhaps not as useful? Also, from an operational perspective (looking holistically), we have LSP p= ing/trace tools specified for MPLS (including SR segments/labels) to verify= /validate consistency between forwarding and control plane to determine whi= ch protocol/label is being used and lot's more details. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 18 August 2020 18:28 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the feedback. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? Thomas> I am open to this approach to change IE46 to include segment types = for RFC8402. I understand your concern to add additional fields. I would ap= preciate feedback from the wg if that is the path we like to go. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? Thomas> "admin distance" is one reason why one path is considered over anot= her from two different protocols. In case of LDP vs IS-IS, in IOS-XR as an = examples, it is "sr-prefer" configuration option. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... Thomas> Correct [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? Thomas> See feedback above. [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thomas> Absolutely. I fully agree on your feedback. We need to have the min= imum possible in order to have a clear view about the MPL-SR forwarding. Si= nce IPFIX using UDP for transport, without the possibility of fragmentation= , we need to be careful as well not to add many more dimension's/fields. Best Wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Monday, August 17, 2020 8:51 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, Please check inline below. From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 11:31 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, * This helps identification of specific SR-MPLS segment types as well a= s differentiating them from LDP, RSVP-TE, etc. To be precise, the existing MPLS Label Type identifier differentiates from = LDP, RSVP-TE. Not the new SrSidType IPFIX IE being proposed. [KT] Why not extend the existing IPFIX MPLS Label Type (value 46) to add SR= Prefix SID, SR Adjacency SID, SR Binding SID ... (basically the segment ty= pes from RFC8402)? It's a simpler change to an existing element/field that = makes it easier for routers, collectors and analysers? * What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? It is important to distinguish between intend and result. [KT] By giving different types for OSPF and ISIS, is the intention to troub= leshoot routing preference selection (done based on "admin distance" betwee= n protocol selection in RIB)? If you migrate from one label distribution protocol to another, a network o= perator want's to understand if the data plane is still forwarding packets = with the label distribution protocol which needs to be removed or not. IE46= enables that by looking at the result of the forwarded traffic and not at = the intend. RFC 8661 section 3, https://tools.ietf.org/html/rfc8661#section= -3, describes the context. [KT] Sure, so adding the SR Segments to IE46, one can check whether the tra= ffic forwarding is happening using LDP or SR labels at any link in the netw= ork.. * What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? Quote from RFC8402. "Segment Routing (SR) leverages the source routing para= digm". Means that not the routing protocol does all the forwarding decision= s, the node can change the forwarding by pushing additional labels.. [KT] From the document, I believe we are still talking only about the top o= f the stack label ... With IPFIX SrSidType we are able to cover this dimension in IPFIX. Enabling= to analyze the result of this decision. The example with " Adjacency SID o= r a LAN Adjacency SID" is not very useful because the difference of the two= is the topology among the adjacency. If you compare " Adjacency SID with P= refix SID", that makes much more sense. Since it describes that a particula= r adjacency is chosen to forward the packet instead of a prefix. If IE 89, = ForwardingStatus is drop, we understand that result of that decision lead t= o the drop and this enables to narrow down forwarding issues in segment rou= ting networks more efficiently and quickly. [KT] My point is why do we need to introduce another ElementID and why not = use the existing Type 46 as suggested above? * am asking for WG to weigh the implementation complexities For the WG and me, I would be important if you can describe more detailed w= hat you mean with implementation complexities. I would like to have a bette= r understanding where your fear is coming from. I would appreciate if you c= ould differentiate between MPLS Label Type identifier, IE46, from which lab= el protocol the label was coming from and SrSidType which SID type was used= . [KT] To be clear, I am not talking from the POV of a specific implementatio= n. Let me summarize my feedback and perspective: * Carefully consider the addition of more control plane elements and nu= ances into IPFIX since they require all that additional context/information= to be made available at the "layer" (or component) from where IPFIX picks = this info (traditionally from the "FIB"). This added information should hav= e a strong enough justification of benefit - e.g. How does difference betwe= en Adj SID and LAN Adj SID matter? How relevant it is to determine if the = SR signaling protocol is OSPF or ISIS? * Try to add/extend existing elements/fields with just the right amount= and sufficient information that is necessary for flow analysis. We need to= note that there may be many more/other sources for "off-box enrichment" of= flow information collected and perhaps not everything needs to be determin= ed and reported by routers. Thanks, Ketan Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Saturday, August 15, 2020 7:09 AM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Thomas, I should have been more clear in my email. The proposal/suggestion is to add the following to the IPFIX MPLS Label typ= e identifier registry: * SR Prefix SID * SR Adjacency SID * SR Binding SID * SR BGP Peering SID * ... and so on This helps identification of specific SR-MPLS segment types as well as diff= erentiating them from LDP, RSVP-TE, etc. And my questions were: 1. What value is provided for IPFIX analysis if the SR Prefix SID was be= ing signalled via OSPF or ISIS? 2. What value is provided for IPFIX analysis if it was a Adjacency SID o= r a LAN Adjacency SID? I am asking for WG to weigh the implementation complexities and overheads w= ith the proposed details of SR-MPLS segments in IPFIX against the benefit (= if any) that they provide for the flow analysis and monitoring. Thanks, Ketan From: Thomas.Graf@swisscom.com > Sent: 15 August 2020 09:40 To: Ketan Talaulikar (ketant) >; = hannes@gredler.at Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Ketan, Thank you very much for the review and feedback. * What or how much value be there on determining whether a SR Prefix SI= D was signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters = and is more important is that it is a Prefix SID. Hardly any deployments wo= uld be running multiple protocols and learning the same prefix from differe= nt IGPs. As Jeff already pointed out. Multiple IGP labelling protocols are used in = networks when migrations are ongoing. Usually in a life cycle. Migrating fr= om LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swisscom = when we first discovered this shortcoming in vendor implementations. The ke= y point here, with these additional IPFIX MPLS Label Type identifiers we en= able the possibility to verify the label protocol migration without taking = the label value into the consideration. * IPFIX may be picking this information from a FIB in some implementati= on where the protocol does not matter and this information is not available= therein. I am not sure if you have seen the presentation in IETF 108 at OPSAWG and S= PRING. https://www.ietf.org/proceedings/108/slides/slides-108-opsawg-export-of-mpl= s-sr-label-type-information-in-ipfix-00.pdf Slide 2 shows Cisco as example vendor which implemented IE 46, MPLS Label T= ype identifier. There is an open ddts where vendor feasibility has been cla= rified. Ping me off the list when you like to have more details. I do understand your point that not all the vendors are capable to implemen= t IE 46. But that's not the point about the IPFIX IE registry. The IE regis= try enables that an IPFIX implementation can refer to the right code point.= With RFC 5102 the decision has been made that MPLS Label Type identifier m= ake sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type just= extends the IE 46 registry with the Segment Routing label protocol code po= ints so when OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, the= IPFIX implementation can point to the right code point. * On some nodes, the same Prefix SID may be learnt via both BGP and IGP= - what would we use/show? In this case the IE 46 shows the label protocol which was used to program t= he FIB. * For that table proposal, it is very difficult and in some cases not p= ossible to different between Prefix and Node and Anycast SID. Many of these= types are control plane elements and we can be sure more get added. I fully agree. As a network operator its still hard to understand the archi= tecture and constraints within a router. When monitoring capabilities are d= iscussed at IETF, this is the usual topic. What is possible, what make sens= e. By purpose, all available SID types are listed in the draft. This with t= he aim to start the discussion in the working groups what is possible what = makes sense. I would be interested to get your and also Jeff's feedback. In above mentioned slides I described how TI-LFA application would benefit = of visibility in the FIB by showing where Adj-SID was used. This should be = a simple example why it make sense not only to look at which label protocol= was used to forward a particular packet, but also which SID type to furthe= r understand the intend why this label is being pushed. I hope this makes all sense. Looking forward for reply. Best wishes Thomas From: Ketan Talaulikar (ketant) > Sent: Friday, August 14, 2020 7:35 PM To: Graf Thomas, INI-NET-DCF >; hannes@gredler.at Cc: lsr@ietf.org; SPRING WG > Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type < also copying Spring WG for their review/inputs > Hi Thomas/All, I have reviewed the draft and would like to share a different perspective. What or how much value be there on determining whether a SR Prefix SID was = signalled/programmed on a node via OSPFv2/OSPFv3/ISIS - what matters and is= more important is that it is a Prefix SID. Hardly any deployments would be= running multiple protocols and learning the same prefix from different IGP= s. IPFIX may be picking this information from a FIB in some implementation = where the protocol does not matter and this information is not available th= erein. On some nodes, the same Prefix SID may be learnt via both BGP and IGP - wha= t would we use/show? I would recommend using SR Prefix SID, SR Adjacency SID, SR Binding SID, SR= BGP Peering SID and so on ... for the MPLS Label Type. This also takes away the need for the second table that is being proposed t= o a large extent. For that table proposal, it is very difficult and in some= cases not possible to different between Prefix and Node and Anycast SID. M= any of these types are control plane elements and we can be sure more get a= dded. Is there really much value in differentiation between say an Adjacenc= y SID and LAN Adjacency SID? Could we evaluate the implementation overhead and complexity of this level = of categorization/information in IPFIX against their value in flow analysis= to perhaps consider a middle ground? Thanks, Ketan From: Lsr > On Behalf Of = Thomas.Graf@swisscom.com Sent: 31 July 2020 20:52 To: hannes@gredler.at Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Hi Hannes, Thanks a lot for the feedback. Yes, makes completely sense. Will take it fo= r the next update... Best Wishes Thomas From: Hannes Gredler > Sent: Wednesday, July 29, 2020 9:31 AM To: Graf Thomas, INI-NET-DCF > Cc: lsr@ietf.org Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type Thomas, I have one comment/suggestion to Paragraph 4 (IANA Considerations). Please add also a code point for BGP Prefix-SID - it's quite popular in DC = deployments. https://tools.ietf.org/html/rfc8669 thanks, /hannes On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote: Dear lsr, I presented the following draft Export of MPLS Segment Routing Label Type Information in IP Flow Informatio= n Export (IPFIX) https://tools.ietf.org/html/draft-tgraf-ipfix-mpls-sr-label-type-04 at the spring working group at IETF 108 yesterday https://www.ietf.org/proceedings/108/slides/slides-108-spring-ip-flow-infor= mation-export-ipfix-00.pdf and today at OPSAWG where I call for adoption. This draft adds additional segment routing code points for in the IANA IPFI= X registry for IS-IS, OPSFv2 and OPSF v3 and segment routing SID types to g= ain further insights into the MPLS-SR forwarding-plane. I have been asked to not only gather feedback from spring and opsawg but al= so from lsr and mpls working groups since these code points are related to = link state routing protocols and mpls data plane. I am looking forward to your feedback and input. Best Wishes Thomas Graf _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr --_000_BYAPR08MB5493C2177F16E6ABD85E1EF4852F0BYAPR08MB5493namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Thomas,

I’ve clarified a few points inline.=

 

Thank you,

--=

Sergey

 

From: Thomas.Graf@swisscom.com <Thomas.Gra= f@swisscom.com>
Sent: Tuesday, September 1, 2020 12:55 AM
To: Fomin, Sergey (Nokia - US/Mountain View) <sergey.fomin@nokia.= com>; ketant=3D40cisco.com@dmarc.ietf.org
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org
Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Sergey,

 =

Thanks for the feedback. I am fu= lly in line with your comment.

 

  • Maybe we should consider adding a generic type 'Segment Routing' w/o = extra details if this might become an implementation challenge?<= /li>

 

I would be interested to underst= and what extra details you would include in this type. Potentially this cou= ld also apply to SRv6 (draft-patki-srv6-ipfix)

[S= F] On the contrary, here I meant without extra details. I think someone menti= oned that it might be challenging to put a protocol identifier there, so in= such cases one option would be is to allow generic “Segment Routing&= #8221; label type (just to distinguish it from LDP/RSVP).

But I= ’m not sure it is needed. Just an option.

 

  • this seems to be significantly more comple= x to implement and arguably IPFIX may not be the best way to collect this i= nfo.

 

You probably are referring to dr= aft-ietf-spring-sr-yang-22, collecting MPLS-SR operational state informatio= n. Correct?

https://datatracker.ietf.org/doc= /html/draft-ietf-spring-sr-yang-22#section-8.3

[S= F] I’m not pointing in any specific direction, I believe there are mult= iple ways to achieve this; each with its own set of pros and cons.

E.g. = an operator may decide to collect control plane information using telemetry= (yang push or openconfig gnmi or anything else) and any type of models (IETF, openconfig, vendor’s proprietary= ), or go with BGP-LS, or put a sensor/NMS into an IGP domain, etc;

and d= o a correlation with IPFIX statistics using an NMS at a later stage. Or do = a simple data enrichment in kafka or whatever pipeline they use for collecting, processing & storing the da= ta.

=  

[S= F] But I’m not against SrSidType in the current form.=

 

As you know, TI-LFA pushing Adj-= SID's in sub seconds, to take an example. From a vendor perspective, do you= think it is technically feasible to get the label number and SID type through YANG push and label number and packet details = from IPFIX within a time frame that the data can be correlated outside the = router to understand that TI-LFA affected the mpls data plane. I fear from = past experience in data-collection, that this is quiet a challenge. But I do also understand the constraints o= f IPFIX.

[SF] Could you ela= borate a little bit on this or correct me if I’m missing something?

TI-LF= A is a local action of re-programming the data plane, which you’ll be= able to see in IPFIX (assuming enough amount traffic & sampling rate). Next you only need to correlate a specific l= abel to its type and the label itself has relatively long lifespan (or coul= d be static, depending on the node config). I don’t see how getting s= rsidtype via IPFIX or another method changes anything here.

Thoug= h you won’t be able to automatically assume whether it was a TI-LFA a= ction or some other traffic engineering mechanism (if you have mix of both in a network), and not any TI-LFA actions results= in adj-sid push.

 

 

Best Wishes

Thomas

 

From: Fomin, Sergey (Nokia - US/Mountain View= ) <sergey.fomin@nokia.com>
Sent: Monday, August 24, 2020 4:08 AM
To: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.or= g>; Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org
Subject: RE: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas, Ketan, all,

 

While I tend to agree with Ketan that, in principle,= specific control plane protocol name might not be the most useful bit of i= nfo, I would argue that it still makes more sense to keep IE46 in this form= at instead of replacing it with srsidtype. I.e. treat IE46 as in ‘control plane protocol that is the source/own= er of a particular label in LIB/LFIB’. Maybe we should consider addin= g a generic type 'Segment Routing' w/o extra details if this might become a= n implementation challenge?

 

I'm in favor of keeping SrSidType as a separate enti= ty -> this seems to be significantly more complex to implement and argua= bly IPFIX may not be the best way to collect this info.

 

--=

Sergey

From: spring <spring-bounces@ietf.org> On Behalf Of Ketan Talaulikar (ketant)
Sent: Tuesday, August 18, 2020 7:23 AM
To: Thomas.Graf@swisscom= .com; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: Re: [spring] [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Thanks for your response. Let u= s also wait for inputs from others in the WGs.

 

One small bit.

 

[KT] By giving different types for OSPF and IS= IS, is the intention to troubleshoot routing preference selection (done bas= ed on “admin distance” between protocol selection in RIB)?<= /b>

Thomas> "admin distance&= quot; is one reason why one path is considered over another from two differ= ent protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

KT2> The proposal to extend = IE46 will cover the “sr-prefer” scenario and indicate whether t= he forwarding is happening with SR or LDP label. IMHO OSPF SR vs ISIS SR is= perhaps not as useful?

 

Also, from an operational persp= ective (looking holistically), we have LSP ping/trace tools specified for M= PLS (including SR segments/labels) to verify/validate consistency between f= orwarding and control plane to determine which protocol/label is being used and lot’s more details.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 18 August 2020 18:28
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 =

Thank you very much for the feed= back.

 

[KT] Why not extend the e= xisting IPFIX MPLS Label Type (value 46) to add SR Prefix SID, SR Adjacency= SID, SR Binding SID … (basically the segment types from RFC8402)? It= ’s a simpler change to an existing element/field that makes it easier for routers, collectors and analysers?=

Thomas> I am o= pen to this approach to change IE46 to include segment types for RFC8402. I= understand your concern to add additional fields. I would appreciate feedback from the wg if that is the path we like to go.=

 =

[KT] By giving different types for OSPF and IS= IS, is the intention to troubleshoot routing preference selection (done bas= ed on “admin distance” between protocol selection in RIB)?<= /b>

Thomas> "admin distance&= quot; is one reason why one path is considered over another from two differ= ent protocols. In case of LDP vs IS-IS, in IOS-XR as an examples, it is "sr-prefer" configuration option.

 

[KT] From the document, I believe we are still= talking only about the top of the stack label …=

Thomas> Correct

 

[KT] My point is why do we need to introduce a= nother ElementID and why not use the existing Type 46 as suggested above?

Thomas> See feedback above.

 

 

[KT] To be clear, I am not talking from the PO= V of a specific implementation. Let me summarize my feedback and perspectiv= e:

  • Carefully consider the addition of more control plane elements = and nuances into IPFIX since they require all that additional context/infor= mation to be made available at the “layer” (or component) from where IPFIX picks this info (traditionally from the &#= 8220;FIB”). This added information should have a strong enough justif= ication of benefit – e.g. How does difference between Adj SID and LAN= Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” of flow information collected= and perhaps not everything needs to be determined and reported by routers.=

 

Thomas> Absolutely. I fully a= gree on your feedback. We need to have the minimum possible in order to hav= e a clear view about the MPL-SR forwarding. Since IPFIX using UDP for transport, without the possibility of fragmentation, w= e need to be careful as well not to add many more dimension's/fields.<= /o:p>

 

Best Wishes

Thomas

 =

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Monday, August 17, 2020 8:51 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

Please check inline below.=

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 11:31
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 =

  • This helps identification of specific SR-MPLS se= gment types as well as differentiating them from LDP, RSVP-TE, etc.

 

To be precise, the existing MPLS= Label Type identifier differentiates from LDP, RSVP-TE. Not the new SrSidT= ype IPFIX IE being proposed.

[KT] Why not extend the e= xisting IPFIX MPLS Label Type (value 46) to add SR Prefix SID, SR Adjacency= SID, SR Binding SID … (basically the segment types from RFC8402)? It= ’s a simpler change to an existing element/field that makes it easier for routers, collectors and analysers?=

 

  • What value is provided for IPFIX analysis if the= SR Prefix SID was being signalled via OSPF or ISIS?

 

It is important to distinguish b= etween intend and result.

[KT] By giving different types for OSPF and IS= IS, is the intention to troubleshoot routing preference selection (done bas= ed on “admin distance” between protocol selection in RIB)?<= /b>

 

If you migrate from one label di= stribution protocol to another, a network operator want's to understand if = the data plane is still forwarding packets with the label distribution protocol which needs to be removed or not. IE46 ena= bles that by looking at the result of the forwarded traffic and not at the = intend. RFC 8661 section 3, https://tools= .ietf.org/html/rfc8661#section-3, describes the context.

[KT] Sure, so adding the = SR Segments to IE46, one can check whether the traffic forwarding is happen= ing using LDP or SR labels at any link in the network..

 =

  • What value is provided for IPFIX analysis if it = was a Adjacency SID or a LAN Adjacency SID?

 

Quote from RFC8402. "Segmen= t Routing (SR) leverages the source routing paradigm". Means that not = the routing protocol does all the forwarding decisions, the node can change the forwarding by pushing additional labels.. <= span style=3D"font-size:10.0pt;font-family:"Trebuchet MS",sans-se= rif">

[KT] From the document, I believe we are still= talking only about the top of the stack label …=

 

With IPFIX SrSidType we are able= to cover this dimension in IPFIX. Enabling to analyze the result of this d= ecision. The example with " Adjacency SID or a LAN Adjacency SID" is not very useful because the difference of the t= wo is the topology among the adjacency. If you compare " Adjacency SID= with Prefix SID", that makes much more sense. Since it describes that= a particular adjacency is chosen to forward the packet instead of a prefix. If IE 89, ForwardingStatus is drop, we underst= and that result of that decision lead to the drop and this enables to narro= w down forwarding issues in segment routing networks more efficiently and q= uickly.

[KT] My point is why do we need to introduce a= nother ElementID and why not use the existing Type 46 as suggested above?

 

  • am asking for WG to weigh t= he implementation complexities

 

For the WG and me, I would be im= portant if you can describe more detailed what you mean with implementation complexities. I would like to ha= ve a better understanding where your fear is coming from. I would appreciat= e if you could differentiate between MPLS Label Type identifier, IE46, from which lab= el protocol the label was coming from and SrSidType which SID type was used= .

[KT] To be clear, I am not talking from the PO= V of a specific implementation. Let me summarize my feedback and perspectiv= e:

  • Carefully consider the addition of more control plane elements = and nuances into IPFIX since they require all that additional context/infor= mation to be made available at the “layer” (or component) from where IPFIX picks this info (traditionally from the &#= 8220;FIB”). This added information should have a strong enough justif= ication of benefit – e.g. How does difference between Adj SID and LAN= Adj SID matter?  How relevant it is to determine if the SR signaling protocol is OSPF or ISIS?
  • Try to add/extend existing elements/fields with just the right amoun= t and sufficient information that is necessary for flow analysis. We need t= o note that there may be many more/other sources for “off-box enrichment” of flow information collected= and perhaps not everything needs to be determined and reported by routers.=

 

Thanks,

Ketan

 

Best wishes

Thomas

 

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Saturday, August 15, 2020 7:09 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Thomas,

 

I should have been more clear i= n my email.

 

The proposal/suggestion is to a= dd the following to the IPFIX MPLS Label type identifier registry:

  • SR Prefix SID
  • SR Adjacency SID
  • SR Binding SID
  • SR BG= P Peering SID
  • … and = so on

 

This helps identification of sp= ecific SR-MPLS segment types as well as differentiating them from LDP, RSVP= -TE, etc.

 

And my questions were:

  1. What value is provided for IPFIX analysis if the= SR Prefix SID was being signalled via OSPF or ISIS?
  2. What value is provided fo= r IPFIX analysis if it was a Adjacency SID or a LAN Adjacency SID?

 

I am asking for WG to weigh the= implementation complexities and overheads with the proposed details of SR-= MPLS segments in IPFIX against the benefit (if any) that they provide for t= he flow analysis and monitoring.

 

Thanks,

Ketan

 

From: Thomas.Graf@swisscom.com <Thomas.Graf@swisscom.com>
Sent: 15 August 2020 09:40
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; hannes@gredler.at
Cc: lsr@ietf.org; spring@ietf.org; opsawg@ietf.org=
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Ketan,

 =

Thank you very much for the revi= ew and feedback.

 

  • What or how much value be there on determining w= hether a SR Prefix SID was signalled/programmed on a node via OSPFv2/OSPFv3= /ISIS – what matters and is more important is that it is a Prefix SID. Hardly any deployments would be running multip= le protocols and learning the same prefix from different IGPs.

 

As Jeff already p= ointed out. Multiple IGP labelling protocols are used  in networks whe= n migrations are ongoing. Usually in a life cycle. Migrating from LDP to OSPFv2/OSPFv3/ISIS SR TLV. This is/was also the case at Swissc= om when we first discovered this shortcoming in vendor implementations. The= key point here, with these additional IPFIX MPLS Label Type identifiers we= enable the possibility to verify the label protocol migration without taking the label value into the consi= deration.

 

  • IPFIX may be picking this information from a FIB= in some implementation where the protocol does not matter and this informa= tion is not available therein.

 

I am not sure if = you have seen the presentation in IETF 108 at OPSAWG and SPRING.=

https://www.ietf.org/proceedings/108/slides/slides-108= -opsawg-export-of-mpls-sr-label-type-information-in-ipfix-00.pdf

 

Slide 2 shows Cis= co as example vendor which implemented IE 46, MPLS Label Type identifier. T= here is an open ddts where vendor feasibility has been clarified. Ping me off the list when you like to have more details.

 =

I do understand your point that = not all the vendors are capable to implement IE 46. But that’s not th= e point about the IPFIX IE registry. The IE registry enables that an I= PFIX implementation can refer to the right code point. With RFC 5102 the de= cision has been made that MPLS Label Type identifier make sense and can be implemented. draft-tgraf-ipfix-mpls-sr-label-type ju= st extends the IE 46 registry with the Segment Routing label protocol code = points so when OSPFv2/OSPFv3/ISIS SR TLV is used, and IE 46 is supported, t= he IPFIX implementation can point to the right code point.

 

  • On some nodes, the same Prefix SID may be learnt= via both BGP and IGP – what would we use/show?

 =

In this case the = IE 46 shows the label protocol which was used to program the FIB.

 =

  • For that table proposal, it= is very difficult and in some cases not possible to different between Pref= ix and Node and Anycast SID. Many of these types are control plane elements= and we can be sure more get added.<= /span>

 

I fully agree. As a network oper= ator its still hard to understand the architecture and constraints within a= router. When monitoring capabilities are discussed at IETF, this is the usual topic. What is possible, what make sense. By pu= rpose, all available SID types are listed in the draft. This with the aim t= o start the discussion in the working groups what is possible what makes se= nse. I would be interested to get your and also Jeff's feedback.

 

In above mentioned slides I desc= ribed how TI-LFA application would benefit of visibility in the FIB by show= ing where Adj-SID was used. This should be a simple example why it make sense not only to look at which label protocol was use= d to forward a particular packet, but also which SID type to further unders= tand the intend why this label is being pushed.

 

I hope this makes all sense. Loo= king forward for reply.

 =

Best wishes<= /o:p>

Thomas=

 =

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Friday, August 14, 2020 7:35 PM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>; hannes@gredler.at
Cc: lsr@ietf.org; SPRING WG <= spring@ietf.org>
Subject: RE: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

< also copying Spring WG for= their review/inputs >

 

Hi Thomas/All,

 

I have reviewed the draft and w= ould like to share a different perspective.

 

What or how much value be there= on determining whether a SR Prefix SID was signalled/programmed on a node = via OSPFv2/OSPFv3/ISIS – what matters and is more important is that i= t is a Prefix SID. Hardly any deployments would be running multiple protocols and learning the same prefix from diff= erent IGPs. IPFIX may be picking this information from a FIB in some implem= entation where the protocol does not matter and this information is not ava= ilable therein.

 

On some nodes, the same Prefix = SID may be learnt via both BGP and IGP – what would we use/show?=

 

I would recommend using SR Pref= ix SID, SR Adjacency SID, SR Binding SID, SR BGP Peering SID and so on R= 30; for the MPLS Label Type.

 

This also takes away the need f= or the second table that is being proposed to a large extent. For that tabl= e proposal, it is very difficult and in some cases not possible to differen= t between Prefix and Node and Anycast SID. Many of these types are control plane elements and we can be sure mor= e get added. Is there really much value in differentiation between say an A= djacency SID and LAN Adjacency SID?

 

Could we evaluate the implement= ation overhead and complexity of this level of categorization/information i= n IPFIX against their value in flow analysis to perhaps consider a middle g= round?

 

Thanks,

Ketan

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Thomas.Graf= @swisscom.com
Sent: 31 July 2020 20:52
To: hannes@gredler.at
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Hi Hannes,

 =

Thanks a lot for the feedback. Y= es, makes completely sense. Will take it for the next update...<= /span>

 

Best Wishes

Thomas

 

 =

From: Hannes Gredler <hannes@gredler.at>
Sent: Wednesday, July 29, 2020 9:31 AM
To: Graf Thomas, INI-NET-DCF <Thomas.Graf@swisscom.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] draft-tgraf-ipfix-mpls-sr-label-type

 

Thomas,

 

I have one comment/suggestion t= o Paragraph 4 (IANA Considerations).

 

Please add also a code point fo= r BGP Prefix-SID - it’s quite popular in DC deployments.

 

thanks,

 

/hannes

=  

On 28.07.2020, at 10:11, Thomas.Graf@swisscom.com wrote:

 

Dear lsr,

 

I presented the following draft

 <= /span>

Export of MPLS Segment Routing Label Type Info= rmation in IP Flow Information Export (IPFIX)

 

at the spring working group at IETF 108 yester= day

 <= /span>

and today at OPSAWG where I call for adoption.=

 <= /span>

This draft adds additional segment routing cod= e points for in the IANA IPFIX registry for IS-IS, OPSFv2 and OPSF v3 and s= egment routing SID types to gain further insights into the MPLS-SR forwarding-plane.<= /span>

 <= /span>

I have been asked to not only gather feedback = from spring and opsawg but also from lsr and mpls working groups since thes= e code points are related to link state routing protocols and mpls data plane.

 <= /span>

I am looking forward to your feedback and inpu= t.

 <= /span>

Best Wishes

Thomas Graf

___________________________________= ____________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

 

--_000_BYAPR08MB5493C2177F16E6ABD85E1EF4852F0BYAPR08MB5493namp_-- From nobody Fri Sep 4 07:57:15 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E250A3A0C31 for ; Fri, 4 Sep 2020 07:57:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.645 X-Spam-Level: X-Spam-Status: No, score=-2.645 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, NICE_REPLY_A=-0.948, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (public key: not available)" header.d=lab.dtag.de Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QU6V8HH3KkQ6 for ; Fri, 4 Sep 2020 07:57:11 -0700 (PDT) Received: from OldBailey.lab.dtag.de (OldBailey.lab.DTAG.DE [194.25.1.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E7AC43A0C1E for ; Fri, 4 Sep 2020 07:57:09 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 0937BCB992; Fri, 4 Sep 2020 16:57:00 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lab.dtag.de; s=dkim; t=1599231421; h=from:subject:date:message-id:to:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=UW2q5/CFs1kLWWR8yfXh5O32trKvT8MCpA2WafpD+h8=; b=dMV98QEKZ/s5VApGrVjDLoWfd+PbSctw6jG9NGiVZi4LOyg1vl+c3GlY77SbqtDhEiSvTb BCDT3s7xnzmUX8EQT5DkOQQbcNd5WiQ/eR9HxMyOJrERBeCrUmwqsBX+WQyAfSX87+xz8M FJSoHqpuFru39ekuK1GzI72yXLa9r+pEjy7VjiggpcoIW3c3NAG9ERNNEvKaz1Twp6Pb8D 6QWaLjdkv5+rmDXWWe7yxmIG0QY142roKxp/V/2GmkNCeLqlx0NDRdv/K881Xb7uAlnkpB +Q/onbmJDvJhvvkvdPLLEMkAbDhiX1vFYlO2KCtn9fJuq3kqRBwnYY80B9N30A== To: Tarek Saad , "spring@ietf.org" References: <15389fb7-d7d5-2f28-2869-4ee9fb84fccb@lab.dtag.de> <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> From: Martin Horneffer Message-ID: Date: Fri, 4 Sep 2020 16:56:59 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Sep 2020 14:57:14 -0000 Hi Tarek, 1) it's a good question what to do label stack has more than one label left, e.g. more SR-MPLS segments. Or a service label. Or both... So far I was considering two possibilities: a) Only one label is dumped. In case of SR-MPLS this means that one sgement can be skipped. In case of a folloowing service label, this could theoretically put the packet in a wrong context. b) The packets is only forwarded if the label was the last, i.e. bottom-of-stack set. Any of the two possibilities would help in the relevant case of an IP packet with a single label (which is the transport label). 2) My assumption would be that the last path information is being used. I.e. if a packets arrives at a router R with a single label. Based on the label R determines a next-hop. If the next-hop does not provide a label for this FEC, then the router effectively performs a POP operations, but still forwards. If the packets arrives at R as plain IP, and the routes can successfully do a route lookup and determine a next-hop, then it sends the packets WITHOUT doing a PUSH operation. If I understood it correctly, this is the way LDP behaves. Best regards, Martin Am 30.08.20 um 02:36 schrieb Tarek Saad: > Hi Martin, > > See inline for some comments. > > On 8/27/20, 6:35 AM, "spring on behalf of Martin Horneffer" wrote: > > Hello everyone, > > may I come back the the question below? Or rather let me update it a little: > > In case an SR-MPLS path is broken, should a node rather drop the packet, > or forward it? > > This can happen whenever the IGP points to a certain next hop, but that > neither supplies a valid SID, nor allows LDP-stitching for whatever > reason. For PUSH as well as for CONTINUE. > > We have been using MPLS transport and a BGP free core since about two > decades now, using LDP. In the analog case, LDP creates "unlabelled" > entries in the LFIB, does the equivalent of a POP operation and forwards > the packet to the next-hop as chosen by the IGP. > > This behavior obviously breaks any traffic that relies on a service > label, but it can protect some traffic. > In our case a huge percentage of all traffic still is public IPv4. This > needs MPLS only for a transport label, be it LDP or SR-MPLS. If this > traffic gets forwarded unlabelled, it follows an IGP default route to a > central device, where it is 1) redirected to the correct destination and > 2) counted in a way that operators can quickly see whether and where > this kind of failure occurs at some point in the network. > > [TS]: The SR Path may be composed of multiple SIDs (i.e. label stack) -- where the top SID destination is not the SR Path endpoint.. I sense from "gets forwarded unlabelled " as you will discard the full label stack (?) and forward the packet unlabeled to the central device? Or are you encapsulating the remaining MPLS packet over IP and IP routing packet to the central device to be inspected? In either case, I expect somehow the packet to be ultimately delivered to the original SR Path endpoint/egress? > > After more operational experience and several internal discussions we > agreed that we want packets to be forwarded unlabelled rather than > dropped. Anyone to share, or oppose this position? > [TS]: again, I'm not clear on when you say "forward unlabelled" - do you mean packets will follow the top SID's the IP IGP route? Or are you peaking into the destination IP (public IPv4) of packet encapsulated in MPLS to determine how to forward it? > > Regards, > Tarek > > Best regards, Martin > > > Am 31.01.20 um 16:50 schrieb Martin Horneffer: > > Hello everyone, > > > > again it seems the interesting questions only show up when applying > > something to the live network... > > > > We ran into something that poses a question related to RFC8660: What > > is the exact meaning of section 2.10.1, "Forwarding for PUSH and > > CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a > > valid MPLS path? > > > > The relevant sections reads: > > > > - Else, if there are other usable next hops, use them to forward > > the incoming packet. The method by which the router "R0" > > decides on the possibility of using other next hops is beyond > > the scope of this document. For example, the MCC on "R0" may > > chose the send an IPv4 packet without pushing any label to > > another next hop. > > > > Does the part "send an IPv4 packet without pushing any label" apply to > > PUSH and CONTINUE, or just to PUSH? > > Does R0 have to validate that neighbor N can correctly process to > > packet? Or can it forward the packet regardless? > > > > The reason for asking is that we are now seeing issues similar to ones > > we had when starting with LDP based MPLS about two decades ago: > > traffic being black holed even though a path to the destination > > exists, because the MPLS path is interrupted somewhere in the middle. > > > > With LDP we know the case of LFIBentries called "unlabelled". While > > this does break connectivity for many kinds of service, e.g. those > > relying on an additional service labels, it still works for plain > > IP(v4) traffic. In our cases, this works perfectly fine for all > > internal routing and control traffic. And even for IPv4 traffic that > > gets collected by a central router that injects a default route. > > > > However, depending on the exact interpretation of the above paragraph, > > an implementor might feel obliged to chose the next paragraph: > > > > - Otherwise, drop the packet. > > > > Which is, at least in our case, very unfortunate... > > > > Any advice or opinion appreciated! > > > > > > Best regards, Martin > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Fri Sep 4 08:01:16 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A3D263A0C85 for ; Fri, 4 Sep 2020 08:01:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.634 X-Spam-Level: X-Spam-Status: No, score=-2.634 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, HTML_MESSAGE=0.001, NICE_REPLY_A=-0.948, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (public key: not available)" header.d=lab.dtag.de Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6EkEhP5OMc4k for ; Fri, 4 Sep 2020 08:01:11 -0700 (PDT) Received: from OldBailey.lab.dtag.de (OldBailey.lab.DTAG.DE [194.25.1.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F4903A0C84 for ; Fri, 4 Sep 2020 08:01:11 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id B263ECB83E; Fri, 4 Sep 2020 17:01:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lab.dtag.de; s=dkim; t=1599231665; h=from:subject:date:message-id:to:cc:mime-version:content-type: in-reply-to:references; bh=k0pSdPqaEF/n5bCOuwRPcyLPQo7aTxw82cJbIfT1xJ4=; b=nwTPiCsK3O+UzlWfoy1bklCzYAukcelYQSf+zBDTy1t6Yt7UTwppBpEDpaoGKL+tQxmKA+ 2PlV093zne8nJMMBkPT7WSWVVtlHVxGtyHBV3J9Lgq9EI5o4HqOEbDTzZOcfgc1nTEHQ2n VYT9C9loCJ1g/bbnr5tD7FivnOuk7kmbLPSh/YDvhdWKuZGqzIrw9AV8U+ZgqjGdOIukg0 jVowQBBdU/+8mTWSzFtIxivLD438eDbAUKkK6RKBFfiwC73xZCLUdyt4pLYv5rTh34DMmy vcfNZOxcz+3Wz0vtkT498nIIqameb3Y+hkV0wVjL+9f/CxTwz6sGIiWXaBXQRw== To: Gyan Mishra , Tarek Saad Cc: "spring@ietf.org" References: <15389fb7-d7d5-2f28-2869-4ee9fb84fccb@lab.dtag.de> <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> From: Martin Horneffer Message-ID: <5f07d1ae-cdc3-7b8b-4bf7-6e7ba97a7669@lab.dtag.de> Date: Fri, 4 Sep 2020 17:01:05 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------AE57A0A3C279A0A851E5140C" X-Last-TLS-Session-Version: TLSv1.3 Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Sep 2020 15:01:15 -0000 This is a multi-part message in MIME format. --------------AE57A0A3C279A0A851E5140C Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Gyan, we had this kind of issue since the rise of LDP and the invention of the BGP free core. In a larger network, every now and then. Some years later the notions of setting up targeted LDP sessions solved some part of the issue. Some more years later, IGP-LDP synchronization indeed solved a big part of the issue in a more elegant way. Yet they don't cover all possible failure cases. Best regards, Martin Am 30.08.20 um 16:21 schrieb Gyan Mishra: > > Hi Martin > > That is a very common scenario that occurs where one path where LDP > neighbor has lost its label binding for FEC destinations. > > Most providers don’t label all prefixes and only label interesting > traffic meaning FEC destination which is the egress endpoint loopback > iBGP peers for an LSP. > > So their is an ACL that is used for label allocation, label > advertisement and label accept policy to created the label binding LIB > and and Label forwarding table LFIB. > > So the LSP is built from ingress PE to egress PE and the label mapping > along the path occurs downstream unsolicited in the opposite direction > of the LSP via label mapping message from the egress PE that the LSP > is being built to - to the ingress PE from the downstream node to the > upstream node. > > Most operators have a BGP free and PIM free core and usually don’t > dual stack the core and the concept of softwire mesh framework RFC > 5565 so 6to4 softwire would be v6 edge over a v4 core or v4 edge over > a v6 core. > > So with the BGP free core all PE are BGP route reflector clients and > have a peer to RRs that sit in the P core. > > The P core is BGP free so only runs an IGP ISIS PE OSPF.  This point > is critical and that is that since the core is BGP free it can not > perform L3 forwarding so all packets must be L2.5 label switched via > topmost label either LDP or RSVP or SR-TE. > > So now that we have established the core construct let’s dig into the > problem with the label mapping being broken on a node along a path. > > So with LDPv4 or LDPv6 or SR-MPLS we have a concept called “ldp-IGP” > synchronization.  SR-MPLS uses IGP sync for SR sid labels as well > since SR is reusing the MPLS data plane. > > So on all MPLS core enabled interfaces on both PE and P LDP sync is > enabled. > > So the goal of ldp-IGP sync is to prevent black hole of packets on > MPLS interfaces cause by MPLS LDP failure and so how it works is the > IGP prefix that needs to build a label binding for FEC destination for > label swapping to occurs in the core so the IGP must not come up and > forward traffic along the path until MPLS is up or traffic will be > “black holed” and dropped.  So how this is accomplished is the IGP > sets the prefix metric to maximum 65535 for ospf and ISIS wide metric > does the same so the path now cannot be utilized until ldp comes up > and the label binding message is received via downstream unsolicited > to create outgoing label for the LFIB entry.  Once LDP is up and the > LFIB entry outing label is populated the IGP prefix is “unset” so now > is set to its normal IGP metric and traffic can now flow over the path. > > For LDP troubleshooting first you have to see if discovery link LDP is > up on the interface and then have to check if both Ldp adjacencent > nodes have a route in rib for each other’s LDP router id for the ldp > neighbor to come UP and label mapping message to be sent.  As you > mentioned if their is summarization for FEC which results in a loop > the binding does not get built for the FEC resulting in unlabeled FECs > in the LFIB. > > Hope that explanation helps. > > > Kind Regards > > Gyan > > On Sat, Aug 29, 2020 at 8:37 PM Tarek Saad > wrote: > > Hi Martin, > > > > See inline for some comments. > > > > On 8/27/20, 6:35 AM, "spring on behalf of Martin Horneffer" > on > behalf of maho@lab.dtag.de > wrote: > > > >     Hello everyone, > > > >     may I come back the the question below? Or rather let me > update it a little: > > > >     In case an SR-MPLS path is broken, should a node rather drop > the packet, > >     or forward it? > > > >     This can happen whenever the IGP points to a certain next hop, > but that > >     neither supplies a valid SID, nor allows LDP-stitching for > whatever > >     reason. For PUSH as well as for CONTINUE. > > > >     We have been using MPLS transport and a BGP free core since > about two > >     decades now, using LDP. In the analog case, LDP creates > "unlabelled" > >     entries in the LFIB, does the equivalent of a POP operation > and forwards > >     the packet to the next-hop as chosen by the IGP. > > > >     This behavior obviously breaks any traffic that relies on a > service > >     label, but it can protect some traffic. > >     In our case a huge percentage of all traffic still is public > IPv4. This > >     needs MPLS only for a transport label, be it LDP or SR-MPLS. > If this > >     traffic gets forwarded unlabelled, it follows an IGP default > route to a > >     central device, where it is 1) redirected to the correct > destination and > >     2) counted in a way that operators can quickly see whether and > where > >     this kind of failure occurs at some point in the network. > > > > [TS]: The SR Path may be composed of multiple SIDs (i.e. label > stack) -- where the top SID destination is not the SR Path > endpoint.. I sense from "gets forwarded unlabelled " as you will > discard the full label stack (?) and forward the packet unlabeled > to the central device? Or are you encapsulating the remaining MPLS > packet over IP and IP routing packet to the central device to be > inspected? In either case, I expect somehow the packet to be > ultimately delivered to the original SR Path endpoint/egress? > > > >     After more operational experience and several internal > discussions we > >     agreed that we want packets to be forwarded unlabelled rather > than > >     dropped. Anyone to share, or oppose this position? > > [TS]: again, I'm not clear on when you say "forward unlabelled" - > do you mean packets will follow the top SID's the IP IGP route? Or > are you peaking into the destination IP (public IPv4) of packet > encapsulated in MPLS to determine how to forward it? > > > > Regards, > > Tarek > > > >     Best regards, Martin > > > > > >     Am 31.01.20 um 16:50 schrieb Martin Horneffer: > >     > Hello everyone, > >     > > >     > again it seems the interesting questions only show up when > applying > >     > something to the live network... > >     > > >     > We ran into something that poses a question related to > RFC8660: What > >     > is the exact meaning of section 2.10.1, "Forwarding for PUSH > and > >     > CONTINUE of Global SIDs", when the chosen neighbor doesn't > provide a > >     > valid MPLS path? > >     > > >     > The relevant sections reads: > >     > > >     >       -  Else, if there are other usable next hops, use them > to forward > >     >          the incoming packet.  The method by which the > router "R0" > >     >          decides on the possibility of using other next hops > is beyond > >     >          the scope of this document.  For example, the MCC > on "R0" may > >     >          chose the send an IPv4 packet without pushing any > label to > >     >          another next hop. > >     > > >     > Does the part "send an IPv4 packet without pushing any > label" apply to > >     > PUSH and CONTINUE, or just to PUSH? > >     > Does R0 have to validate that neighbor N can correctly > process to > >     > packet? Or can it forward the packet regardless? > >     > > >     > The reason for asking is that we are now seeing issues > similar to ones > >     > we had when starting with LDP based MPLS about two decades ago: > >     > traffic being black holed even though a path to the destination > >     > exists, because the MPLS path is interrupted somewhere in > the middle. > >     > > >     > With LDP we know the case of LFIBentries called > "unlabelled". While > >     > this does break connectivity for many kinds of service, e.g. > those > >     > relying on an additional service labels, it still works for > plain > >     > IP(v4) traffic. In our cases, this works perfectly fine for all > >     > internal routing and control traffic. And even for IPv4 > traffic that > >     > gets collected by a central router that injects a default route. > >     > > >     > However, depending on the exact interpretation of the above > paragraph, > >     > an implementor might feel obliged to chose the next paragraph: > >     > > >     >       -  Otherwise, drop the packet. > >     > > >     > Which is, at least in our case, very unfortunate... > >     > > >     > Any advice or opinion appreciated! > >     > > >     > > >     > Best regards, Martin > >     > > >     > > >     > > >     > > >     > _______________________________________________ > >     > spring mailing list > >     > spring@ietf.org > >     > https://www.ietf.org/mailman/listinfo/spring > > > >     _______________________________________________ > >     spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- > > > > *Gyan Mishra* > > /Network Solutions A//rchitect / > > /M 301 502-1347 > 13101 Columbia Pike > /Silver Spring, MD > > --------------AE57A0A3C279A0A851E5140C Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Hi Gyan,

we had this kind of issue since the rise of LDP and the invention of the BGP free core. In a larger network, every now and then.

Some years later the notions of setting up targeted LDP sessions solved some part of the issue.
Some more years later, IGP-LDP synchronization indeed solved a big part of the issue in a more elegant way.
Yet they don't cover all possible failure cases.

Best regards, Martin


Am 30.08.20 um 16:21 schrieb Gyan Mishra:

Hi Martin

That is a very common scenario that occurs where one path where LDP neighbor has lost its label binding for FEC destinations.  

Most providers don’t label all prefixes and only label interesting traffic meaning FEC destination which is the egress endpoint loopback iBGP peers for an LSP.

So their is an ACL that is used for label allocation, label advertisement and label accept policy to created the label binding LIB and and Label forwarding table LFIB.  

So the LSP is built from ingress PE to egress PE and the label mapping along the path occurs downstream unsolicited in the opposite direction of the LSP via label mapping message from the egress PE that the LSP is being built to - to the ingress PE from the downstream node to the upstream node.

Most operators have a BGP free and PIM free core and usually don’t dual stack the core and the concept of softwire mesh framework RFC 5565 so 6to4 softwire would be v6 edge over a v4 core or v4 edge over a v6 core.  

So with the BGP free core all PE are BGP route reflector clients and have a peer to RRs that sit in the P core. 

The P core is BGP free so only runs an IGP ISIS PE OSPF.  This point is critical and that is that since the core is BGP free it can not perform L3 forwarding so all packets must be L2.5 label switched via topmost label either LDP or RSVP or SR-TE.

So now that we have established the core construct let’s dig into the problem with the label mapping being broken on a node along a path.

So with LDPv4 or LDPv6 or SR-MPLS we have a concept called “ldp-IGP” synchronization.  SR-MPLS uses IGP sync for SR sid labels as well since SR is reusing the MPLS data plane.

So on all MPLS core enabled interfaces on both PE and P LDP sync is enabled. 

So the goal of ldp-IGP sync is to prevent black hole of packets on MPLS interfaces cause by MPLS LDP failure and so how it works is the IGP prefix that needs to build a label binding for FEC destination for label swapping to occurs in the core so the IGP must not come up and forward traffic along the path until MPLS is up or traffic will be “black holed” and dropped.  So how this is accomplished is the IGP sets the prefix metric to maximum 65535 for ospf and ISIS wide metric does the same so the path now cannot be utilized until ldp comes up and the label binding message is received via downstream unsolicited to create outgoing label for the LFIB entry.  Once LDP is up and the LFIB entry outing label is populated the IGP prefix is “unset” so now is set to its normal IGP metric and traffic can now flow over the path.

For LDP troubleshooting first you have to see if discovery link LDP is up on the interface and then have to check if both Ldp adjacencent nodes have a route in rib for each other’s LDP router id for the ldp neighbor to come UP and label mapping message to be sent.  As you mentioned if their is summarization for FEC which results in a loop the binding does not get built for the FEC resulting in unlabeled FECs in the LFIB.

Hope that explanation helps.


Kind Regards 

Gyan 

On Sat, Aug 29, 2020 at 8:37 PM Tarek Saad <tsaad.net@gmail.com> wrote:
Hi Martin,



See inline for some comments.



On 8/27/20, 6:35 AM, "spring on behalf of Martin Horneffer" <spring-bounces@ietf.org on behalf of maho@lab.dtag.de> wrote:



    Hello everyone,



    may I come back the the question below? Or rather let me update it a little:



    In case an SR-MPLS path is broken, should a node rather drop the packet,

    or forward it?



    This can happen whenever the IGP points to a certain next hop, but that

    neither supplies a valid SID, nor allows LDP-stitching for whatever

    reason. For PUSH as well as for CONTINUE.



    We have been using MPLS transport and a BGP free core since about two

    decades now, using LDP. In the analog case, LDP creates "unlabelled"

    entries in the LFIB, does the equivalent of a POP operation and forwards

    the packet to the next-hop as chosen by the IGP.



    This behavior obviously breaks any traffic that relies on a service

    label, but it can protect some traffic.

    In our case a huge percentage of all traffic still is public IPv4. This

    needs MPLS only for a transport label, be it LDP or SR-MPLS. If this

    traffic gets forwarded unlabelled, it follows an IGP default route to a

    central device, where it is 1) redirected to the correct destination and

    2) counted in a way that operators can quickly see whether and where

    this kind of failure occurs at some point in the network.



[TS]: The SR Path may be composed of multiple SIDs (i.e. label stack) -- where the top SID destination is not the SR Path endpoint.. I sense from "gets forwarded unlabelled " as you will discard the full label stack (?) and forward the packet unlabeled to the central device? Or are you encapsulating the remaining MPLS packet over IP and IP routing packet to the central device to be inspected? In either case, I expect somehow the packet to be ultimately delivered to the original SR Path endpoint/egress?



    After more operational experience and several internal discussions we

    agreed that we want packets to be forwarded unlabelled rather than

    dropped. Anyone to share, or oppose this position?

[TS]: again, I'm not clear on when you say "forward unlabelled" - do you mean packets will follow the top SID's the IP IGP route? Or are you peaking into the destination IP (public IPv4) of packet encapsulated in MPLS to determine how to forward it?



Regards,

Tarek



    Best regards, Martin





    Am 31.01.20 um 16:50 schrieb Martin Horneffer:

    > Hello everyone,

    >

    > again it seems the interesting questions only show up when applying

    > something to the live network...

    >

    > We ran into something that poses a question related to RFC8660: What

    > is the exact meaning of section 2.10.1, "Forwarding for PUSH and

    > CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a

    > valid MPLS path?

    >

    > The relevant sections reads:

    >

    >       -  Else, if there are other usable next hops, use them to forward

    >          the incoming packet.  The method by which the router "R0"

    >          decides on the possibility of using other next hops is beyond

    >          the scope of this document.  For example, the MCC on "R0" may

    >          chose the send an IPv4 packet without pushing any label to

    >          another next hop.

    >

    > Does the part "send an IPv4 packet without pushing any label" apply to

    > PUSH and CONTINUE, or just to PUSH?

    > Does R0 have to validate that neighbor N can correctly process to

    > packet? Or can it forward the packet regardless?

    >

    > The reason for asking is that we are now seeing issues similar to ones

    > we had when starting with LDP based MPLS about two decades ago:

    > traffic being black holed even though a path to the destination

    > exists, because the MPLS path is interrupted somewhere in the middle.

    >

    > With LDP we know the case of LFIBentries called "unlabelled". While

    > this does break connectivity for many kinds of service, e.g. those

    > relying on an additional service labels, it still works for plain

    > IP(v4) traffic. In our cases, this works perfectly fine for all

    > internal routing and control traffic. And even for IPv4 traffic that

    > gets collected by a central router that injects a default route.

    >

    > However, depending on the exact interpretation of the above paragraph,

    > an implementor might feel obliged to chose the next paragraph:

    >

    >       -  Otherwise, drop the packet.

    >

    > Which is, at least in our case, very unfortunate...

    >

    > Any advice or opinion appreciated!

    >

    >

    > Best regards, Martin

    >

    >

    >

    >

    > _______________________________________________

    > spring mailing list

    > spring@ietf.org

    > https://www.ietf.org/mailman/listinfo/spring



    _______________________________________________

    spring mailing list

    spring@ietf.org

    https://www.ietf.org/mailman/listinfo/spring

_______________________________________________

spring mailing list

spring@ietf.org

https://www.ietf.org/mailman/listinfo/spring

--


Gyan Mishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD



--------------AE57A0A3C279A0A851E5140C-- From nobody Fri Sep 4 08:04:06 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 57D6A3A0C85 for ; Fri, 4 Sep 2020 08:04:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.645 X-Spam-Level: X-Spam-Status: No, score=-2.645 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, NICE_REPLY_A=-0.948, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (public key: not available)" header.d=lab.dtag.de Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nVFW20lMweQT for ; Fri, 4 Sep 2020 08:04:03 -0700 (PDT) Received: from OldBailey.lab.dtag.de (OldBailey.lab.DTAG.DE [194.25.1.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA0953A0C92 for ; Fri, 4 Sep 2020 08:04:02 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 01AF4CBB09; Fri, 4 Sep 2020 17:03:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lab.dtag.de; s=dkim; t=1599231840; h=from:subject:date:message-id:to:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=WHPel+Fz4YzxpTTUsRrTxJEvZ4d+ihMymNrcx/f/BHI=; b=gNuBpxn74aIPe5OlvXrFZguknmxMWggOooCn2JfvV7jSE7LbISss1GDe1IDrQiRxhSwOPX iSDJ4T37Tox6g1DJqFtUEFt1Z85OOMKtgxBekRhfcyBOqYDUP9qtpwq+UwW3QsInblYspq 0fbD3Mp5wuVKupujMMvSsa5Chocp9uvvB+A2/Jj6SiBrEr+Kw+qk1sbcgAvolbgId4tde6 DTBaljYHISbsnF+syGkzaQgDOFlqsD4puDZvnrGImjwGsWfmM4A1KDYxnC9EMTf/5ftQSQ rsz72Zf57WKHe7L1u88A46xVi1aybA3ZkLVUK7uylfK5BARRxQdKAFXlLUF5gg== To: "Jakob Heitz (jheitz)" , "spring@ietf.org" References: <15389fb7-d7d5-2f28-2869-4ee9fb84fccb@lab.dtag.de> <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> From: Martin Horneffer Message-ID: Date: Fri, 4 Sep 2020 17:03:59 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Sep 2020 15:04:05 -0000 Hi Jakob, the security consideration is a good one. However I am not asking for more than LDP used to do for decades. An MPLS backbone needs to make sure that MPLS packets are not accepted from untrusted neighbors. Best regards, Martin Am 28.08.20 um 20:31 schrieb Jakob Heitz (jheitz): > It all hinges on "useable next hops". If the connected next hop > (a bgp next hop may not be connected) has a correct route for the > packet, then it is useable. > > One more consideration: With the BGP free core, external devices > cannot send packets to your internal routers. Once you allow to > forward packets without a labelled route, you need to make sure that > this protection remains. > > Regards, > Jakob. > > -----Original Message----- > From: spring On Behalf Of Martin Horneffer > Sent: Thursday, August 27, 2020 3:35 AM > To: spring@ietf.org > Subject: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) > > Hello everyone, > > may I come back the the question below? Or rather let me update it a little: > > In case an SR-MPLS path is broken, should a node rather drop the packet, > or forward it? > This can happen whenever the IGP points to a certain next hop, but that > neither supplies a valid SID, nor allows LDP-stitching for whatever > reason. For PUSH as well as for CONTINUE. > > We have been using MPLS transport and a BGP free core since about two > decades now, using LDP. In the analog case, LDP creates "unlabelled" > entries in the LFIB, does the equivalent of a POP operation and forwards > the packet to the next-hop as chosen by the IGP. > > This behavior obviously breaks any traffic that relies on a service > label, but it can protect some traffic. > In our case a huge percentage of all traffic still is public IPv4. This > needs MPLS only for a transport label, be it LDP or SR-MPLS. If this > traffic gets forwarded unlabelled, it follows an IGP default route to a > central device, where it is 1) redirected to the correct destination and > 2) counted in a way that operators can quickly see whether and where > this kind of failure occurs at some point in the network. > > After more operational experience and several internal discussions we > agreed that we want packets to be forwarded unlabelled rather than > dropped. Anyone to share, or oppose this position? > > Best regards, Martin > > > Am 31.01.20 um 16:50 schrieb Martin Horneffer: >> Hello everyone, >> >> again it seems the interesting questions only show up when applying >> something to the live network... >> >> We ran into something that poses a question related to RFC8660: What >> is the exact meaning of section 2.10.1, "Forwarding for PUSH and >> CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a >> valid MPLS path? >> >> The relevant sections reads: >> >>       -  Else, if there are other usable next hops, use them to forward >>          the incoming packet.  The method by which the router "R0" >>          decides on the possibility of using other next hops is beyond >>          the scope of this document.  For example, the MCC on "R0" may >>          chose the send an IPv4 packet without pushing any label to >>          another next hop. >> >> Does the part "send an IPv4 packet without pushing any label" apply to >> PUSH and CONTINUE, or just to PUSH? >> Does R0 have to validate that neighbor N can correctly process to >> packet? Or can it forward the packet regardless? >> >> The reason for asking is that we are now seeing issues similar to ones >> we had when starting with LDP based MPLS about two decades ago: >> traffic being black holed even though a path to the destination >> exists, because the MPLS path is interrupted somewhere in the middle. >> >> With LDP we know the case of LFIBentries called "unlabelled". While >> this does break connectivity for many kinds of service, e.g. those >> relying on an additional service labels, it still works for plain >> IP(v4) traffic. In our cases, this works perfectly fine for all >> internal routing and control traffic. And even for IPv4 traffic that >> gets collected by a central router that injects a default route. >> >> However, depending on the exact interpretation of the above paragraph, >> an implementor might feel obliged to chose the next paragraph: >> >>       -  Otherwise, drop the packet. >> >> Which is, at least in our case, very unfortunate... >> >> Any advice or opinion appreciated! >> >> >> Best regards, Martin >> >> >> >> >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Fri Sep 4 08:49:30 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 344F63A0D6E for ; Fri, 4 Sep 2020 08:49:28 -0700 (PDT) X-Virus-Scanned: amavisd-new 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opfedar00.francetelecom.fr (ESMTP service) with ESMTPS id 4Bjhtr6SMkzCqk4; Fri, 4 Sep 2020 17:49:24 +0200 (CEST) From: To: Martin Horneffer CC: "spring@ietf.org" Thread-Topic: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) Thread-Index: AQHWfF3A/TIQJ4ZI7UWGe/Pdp2yqyqlYqT1w Date: Fri, 4 Sep 2020 15:49:24 +0000 Message-ID: <22402_1599234564_5F526204_22402_314_1_53C29892C857584299CBF5D05346208A48F58F00@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <15389fb7-d7d5-2f28-2869-4ee9fb84fccb@lab.dtag.de> <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> In-Reply-To: <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org 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multipart/alternative; boundary="Apple-Mail=_2BF700F4-6844-4184-A992-E70A00C08793" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.15\)) Date: Fri, 4 Sep 2020 16:36:48 -0700 In-Reply-To: Cc: "secdir@ietf.org" , "draft-ietf-spring-srv6-network-programming.all@ietf.org" , "spring@ietf.org" , "last-call@ietf.org" To: "Pablo Camarillo (pcamaril)" References: <159849805983.7699.460089427690333419@ietfa.amsl.com> X-Mailer: Apple Mail (2.3445.104.15) Archived-At: Subject: Re: [spring] Secdir last call review of draft-ietf-spring-srv6-network-programming-17 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Sep 2020 23:36:57 -0000 --Apple-Mail=_2BF700F4-6844-4184-A992-E70A00C08793 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Pablo, > On Sep 1, 2020, at 8:37 AM, Pablo Camarillo (pcamaril) = wrote: >=20 > Hi Brian, >=20 > Many thanks for the time you took to do a thorough review, please see = inline below with [PC]. >=20 > Cheers, > Pablo. >=20 > -----Original Message----- > From: Brian Weis via Datatracker >=20 > Sent: jueves, 27 de agosto de 2020 5:14 > To: secdir@ietf.org > Cc: draft-ietf-spring-srv6-network-programming.all@ietf.org = ; = spring@ietf.org ; last-call@ietf.org = > Subject: Secdir last call review of = draft-ietf-spring-srv6-network-programming-17 >=20 > Reviewer: Brian Weis > Review result: Has Nits >=20 > This document is titled =E2=80=9CSRv6 Network Programming=E2=80=9D, = which is attention grabbing. It fleshes out how Segment Routing routes = IPv6 packets by Segment ID (SID), as well as defining the format of a = SID for IPv6. The Introduction states, =E2=80=9CAn ingress node steers a = packet through an ordered list of instructions, called segments.=E2=80=9D = When one considers this statement along with the document title, it=E2=80=99= s apparent that network devices are indeed being given = =E2=80=9Cinstructions=E2=80=9D in the programming sense, where each = =E2=80=9Cinstruction=E2=80=9D is encoded in an IPv6 address. >=20 > An =E2=80=9Cinstruction=E2=80=9D (i.e., SRv6 SID) comprises a locator = (which is used to route to a particular network device), and also = directs the network device acting as the locator how to process the IPv6 = packet. With the help of an IPv6 Segment Routing Header (SRH) header, a = series of =E2=80=9Cinstructions=E2=80=9D can source route a packet = through the network, where each network device acting as a locator = learns how to handle the packet before possibly sending it on to the = next SID (if any). >=20 > The encoding of an IPv6 address as an SRv6 SID includes a locator, a = code indicating a certain function, and optionally arguments to that = function. An initial set of codes (and their associated algorithms) is = defined in this document. Most of the codes describe how the egress = router should decapsulate the packet, with might include defining which = routing table the receiving router should look up after decapsulation. >=20 > The Security Considerations section points to the Security = Considerations of the architecture document and the SRH document. Both = documents focus on the fact that SRv6 is intended to be used within a = single domain (e.g., provider > network) and discuss routing mitigations such as filtering external = traffic appropriately. They seem to assume that the boundaries of the = domain itself are inviolate such that the domain boundary devices are = not subverted, and that there are no bad actors within the domain. These = are common assumptions for service provider networks where Segment = Routing is intended to be deployed. >=20 > However, it cannot be certain that all networks deploying Service = Routing to be free of bad actors, and there will certainly be some = benefit to a bad actor changing =E2=80=9Cinstructions=E2=80=9D encoded = in IPv6 addresses. Perhaps there is opportunity for mischief in changing = the routing table argument in an End.DT46, for example. Also, as other = SRv6 functions are defined (e.g., packet inspection functions), it would = be important to ensure that those SIDs are not modified to avoid or = decrease the quality of those inspection functions. >=20 > [PC] Indeed, the assumption that a domain is free of bad actors is a = common assumption for networks where SRv6 is intended to be deployed. = The security section of RFC8754 does talk about these bad actor attacks = (7.1) on such networks, and other types of attacks they can launch. >=20 > The SRH document does describe an HMAC TLV that is intended to = mitigate these kinds of attacks. Since neither of the referenced = documents Security Considerations mention it, it would be a good idea to = describe here that there are threats to changing SIDs, and point out how = to mitigate them with the HMAC TLV. >=20 > [PC] The HMAC TLV allows a segment endpoint node to "verify that the = SRH applied to a packet was selected by an authorized party and to = ensure that the segment list is not modified after generation." We = could call this out specifically in the security section. > > Together, they describe the required security mechanisms > that allow establishment of an SR domain of trust to operate > SRv6-based services for internal traffic while preventing any > external traffic from accessing or exploiting the SRv6-based > services. =20 > > > Together, they describe the required security mechanisms > that allow establishment of an SR domain of trust to operate > SRv6-based services for internal traffic while preventing any > external traffic from accessing or exploiting the SRv6-based > services. Additionally, RFC8754 defines an HMAC TLV permitting nodes = in the SR domain to verify that the SRH applied to a packet was selected = by an authorized party and to ensure that the segment list is not = modified after generation, providing further protection against bad = actors within the SR domain. > The new wording sounds good to me, thanks. >=20 > Also, if I=E2=80=99m not mistaken, when there is just one SID then it = is placed in the > IPv6 DA and there is no SRH header or HMAC TLV.=20 >=20 > [PC] The SRH MAY be included when there is just one SID if flags or = TLVs are required (RFC8754 section 4.1 paragraph 1) so the HMAC TLV may = be used in this case. This might be good to point out too. How about putting it in context of = this section something like this: =E2=80=9CWhen modification detection = is deemed important, an SRH header with an HMAC TLV SHOULD be included = even when just one SID is required. This ensures that the SID is = protected just as when the SRH is used to carry multiple SIDs.=E2=80=9D. = I recognize this is adding a new normative requirement, but it is = dependent on the first clause being true so might not be so = objectionable. Thanks, Brian >=20 > This is a general problem with ensuring that the DA on packets are not = changed in transit, and one could use IPsec to mitigate that issue. = It=E2=80=99s probably worthwhile mentioning something like that. --Apple-Mail=_2BF700F4-6844-4184-A992-E70A00C08793 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Pablo,

On Sep 1, 2020, at 8:37 AM, Pablo Camarillo = (pcamaril) <pcamaril@cisco.com> wrote:

Hi Brian,

Many thanks for the time you = took to do a thorough review, please see inline below with = [PC].

Cheers,
Pablo.

-----Original Message-----
From: Brian Weis via Datatracker <noreply@ietf.org> 
Sent: jueves, 27 de agosto de = 2020 5:14
To: secdir@ietf.org
Cc: draft-ietf-spring-srv6-network-programming.all@ietf.org; spring@ietf.org; last-call@ietf.org
Subject: Secdir last call review = of draft-ietf-spring-srv6-network-programming-17

Reviewer: Brian Weis
Review result: Has = Nits

This document = is titled =E2=80=9CSRv6 Network Programming=E2=80=9D, which is attention = grabbing. It fleshes out how Segment Routing routes IPv6 packets by = Segment ID (SID), as well as defining the format of a SID for IPv6. The = Introduction states, =E2=80=9CAn ingress node steers a packet through an = ordered list of instructions, called segments.=E2=80=9D When one = considers this statement along with the document title, it=E2=80=99s = apparent that network devices are indeed being given =E2=80=9Cinstructions= =E2=80=9D in the programming sense, where each =E2=80=9Cinstruction=E2=80=9D= is encoded in an IPv6 address.

An =E2=80=9Cinstruction=E2=80=9D (i.e., SRv6 SID) comprises a = locator (which is used to route to a particular network device), and = also directs the network device acting as the locator how to process the = IPv6 packet. With the help of an IPv6 Segment Routing Header (SRH) = header, a series of =E2=80=9Cinstructions=E2=80=9D can source route a = packet through the network, where each network device acting as a = locator learns how to handle the packet before possibly sending it on to = the next SID (if any).

The encoding of an IPv6 address as an SRv6 SID includes a = locator, a code indicating a certain function, and optionally arguments = to that function. An initial set of codes (and their associated = algorithms) is defined in this document. Most of the codes describe how = the egress router should decapsulate the packet, with might include = defining  which routing table the receiving router should look up = after decapsulation.

The Security Considerations section points to the Security = Considerations of the architecture document and the SRH document. Both = documents focus on the fact that SRv6 is intended to be used within a = single domain (e.g., provider
network) and discuss routing mitigations such as filtering = external traffic appropriately. They seem to assume that the boundaries = of the domain itself are inviolate such that the domain boundary devices = are not subverted, and that there are no bad actors within the domain. = These are common assumptions for service provider networks where Segment = Routing is intended to be deployed.

However, it cannot be certain that all networks deploying = Service Routing to be free of bad actors, and there will certainly be = some benefit to a bad actor changing =E2=80=9Cinstructions=E2=80=9D = encoded in IPv6 addresses. Perhaps there is opportunity for mischief in = changing the routing table argument in an End.DT46, for example. = Also, as other SRv6 functions are defined (e.g., packet inspection = functions), it would be important to ensure that those SIDs are not = modified to avoid or decrease the quality of those inspection = functions.

[PC] Indeed, = the assumption that a domain is free of bad actors is a common = assumption for networks where SRv6 is intended to be deployed. The = security section of RFC8754 does talk about these bad actor attacks = (7.1) on such networks, and other types of attacks they can = launch.

The SRH = document does describe an HMAC TLV that is intended to mitigate these = kinds of attacks. Since neither of the referenced documents Security = Considerations mention it, it would be a good idea to describe here that = there are threats to changing SIDs, and point out how to mitigate them = with the HMAC TLV.

[PC] The HMAC TLV allows a segment endpoint node to "verify = that the SRH applied to a packet was selected by an authorized party and = to ensure that the segment list is not modified after generation." =  We could call this out specifically in the security = section.
<OLD>
Together, they describe the required security = mechanisms
  that allow establishment of an SR domain of trust = to operate
  SRv6-based services for internal traffic while = preventing any
  external traffic from accessing or exploiting the = SRv6-based
  services.  
</OLD>
<NEW>
Together, they describe the required security = mechanisms
  that allow establishment of an SR domain of trust = to operate
  SRv6-based services for internal traffic while = preventing any
  external traffic from accessing or exploiting the = SRv6-based
  services. Additionally, RFC8754 defines an HMAC = TLV permitting nodes in the SR domain to verify that the SRH applied to = a packet was selected by an authorized party and to ensure that the = segment list is not modified after generation, providing further = protection against bad actors within the SR domain.
</NEW>

The new wording = sounds good to me, thanks.

Also, if I=E2=80=99m not mistaken, when there is just one SID = then it is placed in the
IPv6 DA and there is no SRH header or HMAC TLV. 

[PC] The SRH MAY be included = when there is just one SID if flags or TLVs are required (RFC8754 = section 4.1 paragraph 1) so the HMAC TLV may be used in this = case.

This = might be good to point out too. How about putting it in context of this = section something like this: =E2=80=9CWhen modification detection is = deemed important, an SRH header with an HMAC TLV SHOULD be included even = when just one SID is required. This ensures that the SID is protected = just as when the SRH is used to carry multiple SIDs.=E2=80=9D. I = recognize this is adding a new normative requirement, but it is = dependent on the first clause being true so might not be so = objectionable.

Thanks,
Brian


This is a general problem with = ensuring that the DA on packets are not changed in transit, and one = could use IPsec to mitigate that issue. It=E2=80=99s probably worthwhile = mentioning something like that.

= --Apple-Mail=_2BF700F4-6844-4184-A992-E70A00C08793-- From nobody Fri Sep 4 20:02:33 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 49ABB3A1127 for ; Fri, 4 Sep 2020 20:02:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y-QHOwi2L5TB for ; Fri, 4 Sep 2020 20:02:29 -0700 (PDT) Received: from mail-vs1-xe31.google.com (mail-vs1-xe31.google.com [IPv6:2607:f8b0:4864:20::e31]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA46F3A1123 for ; Fri, 4 Sep 2020 20:02:28 -0700 (PDT) Received: by mail-vs1-xe31.google.com with SMTP id q13so4657379vsj.13 for ; Fri, 04 Sep 2020 20:02:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=gLu7RzL7sSLUQyfsptZ66aVeJjYhilVDaxEDIJwubvY=; b=fFRgOGD1EXC9uzodbp0jQxgZvWLD+HQv6fCnOD4TwtXt5sjN7sAPNJCqJJL4f4BelX ObUv2ovymXADm55bure1w/lJxFavtqUqgsSf4B5tq9wBg0RUMajzbmSFelUj/CQPLgWt Hx0kOY+GegmEBQZAh0Da4Z/GwulBOCAH2sZz0kB8ah+NP1QYWcEx81FmsxOYJRV/oraF vqAcoTVgKvFVJVZm5bauW9r31e6Yv5J01jKXUN42DcHlrgfjlahKOcjrhilHJoTo1pzB BVLOQ6c8yjHZl0XjDeadirN8yUtlPLyGSbU3N2dsJ73W2uCyxxAd1donfRQvrRq68fSY PQow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=gLu7RzL7sSLUQyfsptZ66aVeJjYhilVDaxEDIJwubvY=; b=dSaPrumKt8Xr8EhQxSIhD5Dc16qk6FfB9cj9R6rrs6p1XNab5RN4RHkwA15K/HygXt tJDjcACxZNrBCFSUZBNJdHVwizZ9uo9UBJrb2Trky3QGPcpnRn4MqVR3U8MeKE3Fknfn TUMQccAl0isS9JVBFPXsPU4MlrNiY7R44TkDTvpFld/eLMT9BGe/ZACOCpZbQolYzrif hgqIJlLOmvFsR4QlMvK0u2BSWAmgYO/ycxk9tlFM768D1lyogvYRhxMSbraCUN3WF8he wxkHRGKUCfc8JMjiaepE24f+Wy7mHQBqj282hbqavsl0R8m44Fy/Dt/OSmfgwCUDejJz VAVg== X-Gm-Message-State: AOAM5309CMWPcvCXZ4VR8cGqdaxZ2PBbf+iEOAlv3F7Skphz4iMoPgOw 8je33kkvZHCCieoYRUNIgz6OhlNiSwcEQxnC94L03VSJanQ= X-Google-Smtp-Source: ABdhPJxnBo3HzfDM4oDximQqcQJQb23vrJwUP+w48rVCY908IwSoiAQ22pFnQejc0mnEK6gR2LhYFiAvrl5qNHjFGvs= X-Received: by 2002:a67:ea92:: with SMTP id f18mr7154302vso.117.1599274947873; Fri, 04 Sep 2020 20:02:27 -0700 (PDT) MIME-Version: 1.0 References: <15389fb7-d7d5-2f28-2869-4ee9fb84fccb@lab.dtag.de> <52be9fc3-0764-93ec-9dca-64291f2f62ab@lab.dtag.de> <5f07d1ae-cdc3-7b8b-4bf7-6e7ba97a7669@lab.dtag.de> In-Reply-To: <5f07d1ae-cdc3-7b8b-4bf7-6e7ba97a7669@lab.dtag.de> From: Gyan Mishra Date: Fri, 4 Sep 2020 23:02:17 -0400 Message-ID: To: Martin Horneffer Cc: Tarek Saad , "spring@ietf.org" Content-Type: multipart/alternative; boundary="0000000000002a932005ae88377d" Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 05 Sep 2020 03:02:32 -0000 --0000000000002a932005ae88377d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Martin Yes MPLS has definitely been a learning curve for operators as especially with LDP-IGP sync, session protection and RLFA LDP tunnel in failure scenarios. In that context of the dropped question with LDP-IGP sync on unlabeled FEC the packets would not get dropped and would take a different path until the unset of maximum metric occurred after LDP came up. Thanks Gyan On Fri, Sep 4, 2020 at 11:01 AM Martin Horneffer wrote: > > > > > > > > > > > Hi Gyan, > > > > > > we had this kind of issue since the rise of LDP and the invention of > > the BGP free core. In a larger network, every now and then. > > > > > > Some years later the notions of setting up targeted LDP sessions > > solved some part of the issue. > > > Some more years later, IGP-LDP synchronization indeed solved a big > > part of the issue in a more elegant way. > > > Yet they don't cover all possible failure cases. > > > > > > Best regards, Martin > > > > > > > > > Am 30.08.20 um 16:21 schrieb Gyan > > Mishra: > > > > > > > > > > > > > > Hi Martin > > > > > > > > That is a very common scenario that occurs where > > one path where LDP neighbor has lost its label binding for FEC > > destinations. > > > > > > > > Most providers don=E2=80=99t label all prefixes and only > > label interesting traffic meaning FEC destination which is the > > egress endpoint loopback iBGP peers for an LSP. > > > > > > > > So their is an ACL that is used for label > > allocation, label advertisement and label accept policy to > > created the label binding LIB and and Label forwarding table > > LFIB. > > > > > > > > So the LSP is built from ingress PE to egress PE > > and the label mapping along the path occurs downstream > > unsolicited in the opposite direction of the LSP via label > > mapping message from the egress PE that the LSP is being built > > to - to the ingress PE from the downstream node to the upstream > > node. > > > > > > > > Most operators have a BGP free and PIM free core > > and usually don=E2=80=99t dual stack the core and the concept of > > softwire mesh framework RFC 5565 so 6to4 softwire would be v6 > > edge over a v4 core or v4 edge over a v6 core. > > > > > > > > So with the BGP free core all PE are BGP route > > reflector clients and have a peer to RRs that sit in the P > > core. > > > > > > > > The P core is BGP free so only runs an IGP ISIS PE > > OSPF. This point is critical and that is that since the core is > > BGP free it can not perform L3 forwarding so all packets must be > > L2.5 label switched via topmost label either LDP or RSVP or > > SR-TE. > > > > > > > > So now that we have established the core construct > > let=E2=80=99s dig into the problem with the label mapping being broken > > on a node along a path. > > > > > > > > So with LDPv4 or LDPv6 or SR-MPLS we have a > > concept called =E2=80=9Cldp-IGP=E2=80=9D synchronization. SR-MPLS uses I= GP sync > > for SR sid labels as well since SR is reusing the MPLS data > > plane. > > > > > > > > So on all MPLS core enabled interfaces on both PE > > and P LDP sync is enabled. > > > > > > > > So the goal of ldp-IGP sync is to prevent black > > hole of packets on MPLS interfaces cause by MPLS LDP failure and > > so how it works is the IGP prefix that needs to build a label > > binding for FEC destination for label swapping to occurs in the > > core so the IGP must not come up and forward traffic along the > > path until MPLS is up or traffic will be =E2=80=9Cblack holed=E2=80=9D an= d > > dropped. So how this is accomplished is the IGP sets the prefix > > metric to maximum 65535 for ospf and ISIS wide metric does the > > same so the path now cannot be utilized until ldp comes up and > > the label binding message is received via downstream unsolicited > > to create outgoing label for the LFIB entry. Once LDP is up and > > the LFIB entry outing label is populated the IGP prefix is > > =E2=80=9Cunset=E2=80=9D so now is set to its normal IGP metric and traffi= c can > > now flow over the path. > > > > > > > > For LDP troubleshooting first you have to see if > > discovery link LDP is up on the interface and then have to check > > if both Ldp adjacencent nodes have a route in rib for each > > other=E2=80=99s LDP router id for the ldp neighbor to come UP and label > > mapping message to be sent. As you mentioned if their is > > summarization for FEC which results in a loop the binding does > > not get built for the FEC resulting in unlabeled FECs in the > > LFIB. > > > > > > > > Hope that explanation helps. > > > > > > > > > > > > > Kind Regards > > > > > > > > Gyan > > > > > > > > On Sat, Aug 29, 2020 at 8:37 > > PM Tarek Saad wrote: > > > > > Hi >> >> Martin, >> >> >> >> >> >> >> >> >> >> >> >> See inline for some comments. >> >> >> >> >> >> >> >> >> >> >> >> =EF=BB=BFOn 8/27/20, 6:35 AM, "spring on behalf of Martin Horneffer" >> >> > >> behalf of maho@lab.dtag.de> wrote: >> >> >> >> >> >> >> >> >> >> >> >> Hello everyone, >> >> >> >> >> >> >> >> >> >> >> >> may I come back the the question below? Or rather let me >> >> update it a little: >> >> >> >> >> >> >> >> >> >> >> >> In case an SR-MPLS path is broken, should a node rather >> >> drop the packet, >> >> >> >> >> >> or forward it? >> >> >> >> >> >> >> >> >> >> >> >> This can happen whenever the IGP points to a certain >> >> next hop, but that >> >> >> >> >> >> neither supplies a valid SID, nor allows LDP-stitching >> >> for whatever >> >> >> >> >> >> reason. For PUSH as well as for CONTINUE. >> >> >> >> >> >> >> >> >> >> >> >> We have been using MPLS transport and a BGP free core >> >> since about two >> >> >> >> >> >> decades now, using LDP. In the analog case, LDP creates >> >> "unlabelled" >> >> >> >> >> >> entries in the LFIB, does the equivalent of a POP >> >> operation and forwards >> >> >> >> >> >> the packet to the next-hop as chosen by the IGP. >> >> >> >> >> >> >> >> >> >> >> >> This behavior obviously breaks any traffic that relies >> >> on a service >> >> >> >> >> >> label, but it can protect some traffic. >> >> >> >> >> >> In our case a huge percentage of all traffic still is >> >> public IPv4. This >> >> >> >> >> >> needs MPLS only for a transport label, be it LDP or >> >> SR-MPLS. If this >> >> >> >> >> >> traffic gets forwarded unlabelled, it follows an IGP >> >> default route to a >> >> >> >> >> >> central device, where it is 1) redirected to the correct >> >> destination and >> >> >> >> >> >> 2) counted in a way that operators can quickly see >> >> whether and where >> >> >> >> >> >> this kind of failure occurs at some point in the >> >> network. >> >> >> >> >> >> >> >> >> >> >> >> [TS]: The SR Path may be composed of multiple SIDs (i.e. >> >> label stack) -- where the top SID destination is not the SR >> >> Path endpoint.. I sense from "gets forwarded unlabelled " as >> >> you will discard the full label stack (?) and forward the >> >> packet unlabeled to the central device? Or are you >> >> encapsulating the remaining MPLS packet over IP and IP >> >> routing packet to the central device to be inspected? In >> >> either case, I expect somehow the packet to be ultimately >> >> delivered to the original SR Path endpoint/egress? >> >> >> >> >> >> >> >> >> >> >> >> After more operational experience and several internal >> >> discussions we >> >> >> >> >> >> agreed that we want packets to be forwarded unlabelled >> >> rather than >> >> >> >> >> >> dropped. Anyone to share, or oppose this position? >> >> >> >> >> >> [TS]: again, I'm not clear on when you say "forward >> >> unlabelled" - do you mean packets will follow the top SID's >> >> the IP IGP route? Or are you peaking into the destination IP >> >> (public IPv4) of packet encapsulated in MPLS to determine >> >> how to forward it? >> >> >> >> >> >> >> >> >> >> >> >> Regards, >> >> >> >> >> >> Tarek >> >> >> >> >> >> >> >> >> >> >> >> Best regards, Martin >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Am 31.01.20 um 16:50 schrieb Martin Horneffer: >> >> >> >> >> >> > Hello everyone, >> >> >> >> >> >> > >> >> >> >> >> >> > again it seems the interesting questions only show >> >> up when applying >> >> >> >> >> >> > something to the live network... >> >> >> >> >> >> > >> >> >> >> >> >> > We ran into something that poses a question related >> >> to RFC8660: What >> >> >> >> >> >> > is the exact meaning of section 2.10.1, "Forwarding >> >> for PUSH and >> >> >> >> >> >> > CONTINUE of Global SIDs", when the chosen neighbor >> >> doesn't provide a >> >> >> >> >> >> > valid MPLS path? >> >> >> >> >> >> > >> >> >> >> >> >> > The relevant sections reads: >> >> >> >> >> >> > >> >> >> >> >> >> > - Else, if there are other usable next hops, >> >> use them to forward >> >> >> >> >> >> > the incoming packet. The method by which >> >> the router "R0" >> >> >> >> >> >> > decides on the possibility of using other >> >> next hops is beyond >> >> >> >> >> >> > the scope of this document. For example, >> >> the MCC on "R0" may >> >> >> >> >> >> > chose the send an IPv4 packet without >> >> pushing any label to >> >> >> >> >> >> > another next hop. >> >> >> >> >> >> > >> >> >> >> >> >> > Does the part "send an IPv4 packet without pushing >> >> any label" apply to >> >> >> >> >> >> > PUSH and CONTINUE, or just to PUSH? >> >> >> >> >> >> > Does R0 have to validate that neighbor N can >> >> correctly process to >> >> >> >> >> >> > packet? Or can it forward the packet regardless? >> >> >> >> >> >> > >> >> >> >> >> >> > The reason for asking is that we are now seeing >> >> issues similar to ones >> >> >> >> >> >> > we had when starting with LDP based MPLS about two >> >> decades ago: >> >> >> >> >> >> > traffic being black holed even though a path to the >> >> destination >> >> >> >> >> >> > exists, because the MPLS path is interrupted >> >> somewhere in the middle. >> >> >> >> >> >> > >> >> >> >> >> >> > With LDP we know the case of LFIBentries called >> >> "unlabelled". While >> >> >> >> >> >> > this does break connectivity for many kinds of >> >> service, e.g. those >> >> >> >> >> >> > relying on an additional service labels, it still >> >> works for plain >> >> >> >> >> >> > IP(v4) traffic. In our cases, this works perfectly >> >> fine for all >> >> >> >> >> >> > internal routing and control traffic. And even for >> >> IPv4 traffic that >> >> >> >> >> >> > gets collected by a central router that injects a >> >> default route. >> >> >> >> >> >> > >> >> >> >> >> >> > However, depending on the exact interpretation of >> >> the above paragraph, >> >> >> >> >> >> > an implementor might feel obliged to chose the next >> >> paragraph: >> >> >> >> >> >> > >> >> >> >> >> >> > - Otherwise, drop the packet. >> >> >> >> >> >> > >> >> >> >> >> >> > Which is, at least in our case, very unfortunate... >> >> >> >> >> >> > >> >> >> >> >> >> > Any advice or opinion appreciated! >> >> >> >> >> >> > >> >> >> >> >> >> > >> >> >> >> >> >> > Best regards, Martin >> >> >> >> >> >> > >> >> >> >> >> >> > >> >> >> >> >> >> > >> >> >> >> >> >> > >> >> >> >> >> >> > _______________________________________________ >> >> >> >> >> >> > spring mailing list >> >> >> >> >> >> > spring@ietf.org >> >> >> >> >> >> > https://www.ietf.org/mailman/listinfo/spring >> >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> >> >> >> >> >> spring mailing list >> >> >> >> >> >> spring@ietf.org >> >> >> >> >> >> https://www.ietf.org/mailman/listinfo/spring >> >> >> >> >> >> _______________________________________________ >> >> >> >> >> >> spring mailing list >> >> >> >> >> >> spring@ietf.org >> >> >> >> >> >> https://www.ietf.org/mailman/listinfo/spring >> >> >> >> >> >> > > > > > > -- > > > > > > > > > > > > > > > > > > > > > > > > > > > > *Gyan Mishra* > > > *Network Solutions A**rchitect * > > > > > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver > Spring, MD > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000002a932005ae88377d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Martin=C2=A0

Yes MPLS has definitely been a learning curve for operators as es= pecially with LDP-IGP sync, session protection and RLFA LDP tunnel in failu= re scenarios.

In that co= ntext of the dropped question with LDP-IGP sync on unlabeled FEC the packet= s would not get dropped and would take a different path until the unset of = maximum metric occurred after LDP came up.

Thanks=C2=A0

Gyan

On Fri, Sep 4, 2020 at 11:01 AM Martin Horneffer <maho@lab.dtag.de> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rg= b(204,204,204)">









= Hi Gyan,





we had this kind of issue since the= rise of LDP and the invention of

the BGP free core. In a larger= network, every now and then.





Some years lat= er the notions of setting up targeted LDP sessions

solved some p= art of the issue.


Some more years later, IGP-LDP synchroniza= tion indeed solved a big

part of the issue in a more elegant way= .


Yet they don't cover all possible failure cases.
<= br>



Best regards, Martin





=


Am 30.08.20 um 16:21 schrieb Gyan

Mis= hra:




=








Hi Martin





=


That is a very common scenario th= at occurs where

one path where LDP neighbor has lost its lab= el binding for FEC

destinations. =C2=A0


<= div dir=3D"auto">




Mo= st providers don=E2=80=99t label all prefixes and only

label= interesting traffic meaning FEC destination which is the

eg= ress endpoint loopback iBGP peers for an LSP.







So their = is an ACL that is used for label

allocation, label advertise= ment and label accept policy to

created the label binding LI= B and and Label forwarding table

LFIB. =C2=A0


=





So the LSP is built from ingress PE to egress PE

and the= label mapping along the path occurs downstream

unsolicited = in the opposite direction of the LSP via label

mapping messa= ge from the egress PE that the LSP is being built

to - to th= e ingress PE from the downstream node to the upstream

node.<= /div>






=
Most operators have a BGP free and PIM free core

= and usually don=E2=80=99t dual stack the core and the concept of
=
softwire mesh framework RFC 5565 so 6to4 softwire would be v6
edge over a v4 core or v4 edge over a v6 core. =C2=A0






So with the BGP free core all PE are BGP route

re= flector clients and have a peer to RRs that sit in the P

cor= e.=C2=A0






<= br>
The P core is BGP free so only runs an IGP ISIS = PE

OSPF.=C2=A0 This point is critical and that is that since= the core is

BGP free it can not perform L3 forwarding so al= l packets must be

L2.5 label switched via topmost label eith= er LDP or RSVP or

SR-TE.







So now that we ha= ve established the core construct

let=E2=80=99s dig into the= problem with the label mapping being broken

on a node along= a path.






<= br>
So with LDPv4 or LDPv6 or SR-MPLS we have a
<= br> concept called =E2=80=9Cldp-IGP=E2=80=9D synchronization.=C2=A0 = SR-MPLS uses IGP sync

for SR sid labels as well since SR is = reusing the MPLS data

plane.







So on all MPL= S core enabled interfaces on both PE

and P LDP sync is enabl= ed.=C2=A0






=
So the goal of ldp-IGP sync is to prevent black=

hole of packets on MPLS interfaces cause by MPLS LDP failur= e and

so how it works is the IGP prefix that needs to build = a label

binding for FEC destination for label swapping to oc= curs in the

core so the IGP must not come up and forward tra= ffic along the

path until MPLS is up or traffic will be =E2= =80=9Cblack holed=E2=80=9D and

dropped.=C2=A0 So how this is= accomplished is the IGP sets the prefix

metric to maximum 6= 5535 for ospf and ISIS wide metric does the

same so the path= now cannot be utilized until ldp comes up and

the label bin= ding message is received via downstream unsolicited

to creat= e outgoing label for the LFIB entry.=C2=A0 Once LDP is up and

= the LFIB entry outing label is populated the IGP prefix is

= =E2=80=9Cunset=E2=80=9D so now is set to its normal IGP metric and traffic= can

now flow over the path.







For LDP troub= leshooting first you have to see if

discovery link LDP is up= on the interface and then have to check

if both Ldp adjacen= cent nodes have a route in rib for each

other=E2=80=99s LDP = router id for the ldp neighbor to come UP and label

mapping = message to be sent.=C2=A0 As you mentioned if their is

summa= rization for FEC which results in a loop the binding does

no= t get built for the FEC resulting in unlabeled FECs in the

L= FIB.







=
Hope that explanation helps.








<= br>


Kind Regards=C2=A0
=






Gyan=C2=A0







On Sat, Aug 29, 2020 at 8:37

PM Tarek Saad <tsaad.net@gmail.com&g= t; wrote:




Hi<= br>
Martin,





<= br>




See inline for some comments= .










=EF=BB=BFOn 8/27/20, 6:35 AM, "spring on behalf = of Martin Horneffer"

<spring-bounces@ietf.org on

= behalf of m= aho@lab.dtag.de> wrote:





=





=C2=A0 =C2=A0 Hello ever= yone,








=


=C2=A0 =C2=A0 may I come back the the question be= low? Or rather let me

update it a little:


=








= =C2=A0 =C2=A0 In case an SR-MPLS path is broken, should a node rather=

drop the packet,





= =C2=A0 =C2=A0 or forward it?





=





=C2=A0 =C2=A0 Th= is can happen whenever the IGP points to a certain

next = hop, but that





=C2=A0 =C2=A0= neither supplies a valid SID, nor allows LDP-stitching

= for whatever





=C2=A0 =C2=A0 = reason. For PUSH as well as for CONTINUE.










=C2=A0 =C2=A0= We have been using MPLS transport and a BGP free core

s= ince about two





=C2=A0 =C2= =A0 decades now, using LDP. In the analog case, LDP creates

= "unlabelled"





= =C2=A0 =C2=A0 entries in the LFIB, does the equivalent of a POP

= operation and forwards





= =C2=A0 =C2=A0 the packet to the next-hop as chosen by the IGP.

<= br>








= =C2=A0 =C2=A0 This behavior obviously breaks any traffic that r= elies

on a service





= =C2=A0 =C2=A0 label, but it can protect some traffic.




=C2=A0 =C2=A0 In our case a huge perce= ntage of all traffic still is

public IPv4. This

=



=C2=A0 =C2=A0 needs MPLS only for a= transport label, be it LDP or

SR-MPLS. If this

=



=C2=A0 =C2=A0 traffic gets forwarde= d unlabelled, it follows an IGP

default route to a
<= br>



=C2=A0 =C2=A0 central device, wh= ere it is 1) redirected to the correct

destination and <= br>




=C2=A0 =C2=A0 2) counted in = a way that operators can quickly see

whether and where <= br>




=C2=A0 =C2=A0 this kind of f= ailure occurs at some point in the

network.


=








= [TS]: The SR Path may be composed of multiple SIDs (i.e.

= label stack) -- where the top SID destination is not the SR
Path endpoint.. I sense from "gets forwarded unlabelled &= quot; as

you will discard the full label stack (?) and f= orward the

packet unlabeled to the central device? Or ar= e you

encapsulating the remaining MPLS packet over IP an= d IP

routing packet to the central device to be inspecte= d? In

either case, I expect somehow the packet to be ult= imately

delivered to the original SR Path endpoint/egres= s?








<= br>

=C2=A0 =C2=A0 After more operational experience and = several internal

discussions we


=


=C2=A0 =C2=A0 agreed that we want packets to be for= warded unlabelled

rather than




=C2=A0 =C2=A0 dropped. Anyone to share, or oppose thi= s position?





[TS]: again, I&#= 39;m not clear on when you say "forward

unlabelled&= quot; - do you mean packets will follow the top SID's

= the IP IGP route? Or are you peaking into the destination IP

= (public IPv4) of packet encapsulated in MPLS to determine

= how to forward it?





=





Regards,


=


Tarek





=





=C2=A0 =C2=A0 Best r= egards, Martin








=








= =C2=A0 =C2=A0 Am 31.01.20 um 16:50 schrieb Martin Horneffer:




=C2=A0 =C2=A0 > Hello everyone,=





=C2=A0 =C2=A0 >

<= br>


=C2=A0 =C2=A0 > again it seems th= e interesting questions only show

up when applying
<= br>



=C2=A0 =C2=A0 > something to = the live network...





=C2=A0 = =C2=A0 >





=C2=A0 =C2=A0 &g= t; We ran into something that poses a question related

t= o RFC8660: What





=C2=A0 =C2= =A0 > is the exact meaning of section 2.10.1, "Forwarding

= for PUSH and





=C2= =A0 =C2=A0 > CONTINUE of Global SIDs", when the chosen neighbor
=
doesn't provide a





= =C2=A0 =C2=A0 > valid MPLS path?



<= br>
=C2=A0 =C2=A0 >





= =C2=A0 =C2=A0 > The relevant sections reads:


=


=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0-=C2=A0 E= lse, if there are other usable next hops,

use them to fo= rward





=C2=A0 =C2=A0 >=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the incoming packet.=C2=A0 The method by wh= ich

the router "R0"




=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 d= ecides on the possibility of using other

next hops is be= yond





=C2=A0 =C2=A0 >=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the scope of this document.=C2=A0 For examp= le,

the MCC on "R0" may


=


=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 chose the send an IPv4 packet without

pushing any la= bel to





=C2=A0 =C2=A0 >=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 another next hop.




=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 > Does the part "send an IPv4 packet wit= hout pushing

any label" apply to


=


=C2=A0 =C2=A0 > PUSH and CONTINUE, or just= to PUSH?





=C2=A0 =C2=A0 >= Does R0 have to validate that neighbor N can

correctly = process to





=C2=A0 =C2=A0 &g= t; packet? Or can it forward the packet regardless?


=


=C2=A0 =C2=A0 >




<= br> =C2=A0 =C2=A0 > The reason for asking is that we are now = seeing

issues similar to ones




=C2=A0 =C2=A0 > we had when starting with LDP base= d MPLS about two

decades ago:




=C2=A0 =C2=A0 > traffic being black holed even tho= ugh a path to the

destination




=C2=A0 =C2=A0 > exists, because the MPLS path is i= nterrupted

somewhere in the middle.


=


=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 > With LDP we know the case of LFIBentri= es called

"unlabelled". While


=


=C2=A0 =C2=A0 > this does break connecti= vity for many kinds of

service, e.g. those


=


=C2=A0 =C2=A0 > relying on an additio= nal service labels, it still

works for plain




=C2=A0 =C2=A0 > IP(v4) traffic. In = our cases, this works perfectly

fine for all




=C2=A0 =C2=A0 > internal routing an= d control traffic. And even for

IPv4 traffic that




=C2=A0 =C2=A0 > gets collected= by a central router that injects a

default route.




=C2=A0 =C2=A0 >


=


=C2=A0 =C2=A0 > However, depending on t= he exact interpretation of

the above paragraph,

=



=C2=A0 =C2=A0 > an implementor m= ight feel obliged to chose the next

paragraph:




=C2=A0 =C2=A0 >


=


=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0-= =C2=A0 Otherwise, drop the packet.





= =C2=A0 =C2=A0 >





= =C2=A0 =C2=A0 > Which is, at least in our case, very unfortunate...
<= br>



=C2=A0 =C2=A0 >


=


=C2=A0 =C2=A0 > Any advice or opinion = appreciated!





=C2=A0 =C2=A0 &= gt;





=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 > Best regards, = Martin





=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 >


=


=C2=A0 =C2=A0 >


=


=C2=A0 =C2=A0 >




=C2=A0 =C2=A0 > ______________________________________= _________





=C2=A0 =C2=A0 >= spring mailing list





=C2=A0 = =C2=A0 > spring@iet= f.org





=C2=A0 =C2=A0 >= https://www.ietf.org/mailman/listinfo/spring









=C2=A0 =C2=A0 _______________________________________________=





=C2=A0 =C2=A0 spring mailin= g list





=C2=A0 =C2=A0 spring@ietf.org




=C2=A0 =C2=A0 http= s://www.ietf.org/mailman/listinfo/spring




_______________________________________________




spring mailing list


=


spring@ietf.org





<= a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer" = target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring

<= br>







--






=




=




=








<= br>



Gyan
Mishra



=

Network Solutions Architect=C2=A0<= /p>

M 301 502-1347


= 13101 Columbia= Pike=C2=A0


= Silver Spring, MD



=





=




=










<= br>











--


= Gyan Mishra

<= i>Network Solutions Architect=C2=A0

M 301 502-134= 7
13101 Columbia Pike=C2=A0
Silver Spring, MD


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ZHk+DQo8L2h0bWw+DQo= --_000_C7C2E1C43D652C4E9E49FE7517C236CB02BC07BAdggeml529mbxchi_-- From nobody Tue Sep 8 00:47:52 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6918D3A0CB1; Tue, 8 Sep 2020 00:47:50 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.15.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <159955127039.2076.5744414745349725295@ietfa.amsl.com> Date: Tue, 08 Sep 2020 00:47:50 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-sr-service-programming-03.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Sep 2020 07:47:50 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Service Programming with Segment Routing Authors : Francois Clad Xiaohu Xu Clarence Filsfils Daniel Bernier Cheng Li Bruno Decraene Shaowen Ma Chaitanya Yadlapalli Wim Henderickx Stefano Salsano Filename : draft-ietf-spring-sr-service-programming-03.txt Pages : 39 Date : 2020-09-08 Abstract: This document defines data plane functionality required to implement service segments and achieve service programming in SR-enabled MPLS and IPv6 networks, as described in the Segment Routing architecture. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-sr-service-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-sr-service-programming-03 https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-service-programming-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-sr-service-programming-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Tue, 8 Sep 2020 08:35:03 +0000 From: Rajesh M To: Rajesh M , "Ketan Talaulikar (ketant)" , "gdawra.ietf@gmail.com" , "Clarence Filsfils (cfilsfil)" , "robert@raszuk.net" , "bruno.decraene@orange.com" , "zhuangshunwan@huawei.com" , "jorge.rabadan@nokia.com" CC: "spring@ietf.org" Thread-Topic: https://tools.ietf.org/html/draft-ietf-bess-srv6-services-04 Thread-Index: AdZ4MNW2XqUqDnZ6QwCVe2fsN6tJPwEDhcRQAAA2K+ABBnf/0AFYQ/Tw Date: Tue, 8 Sep 2020 08:35:03 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-08-22T03:13:26Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=558e4b75-cfc5-4de3-87d0-5beb9c66ec74; 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boundary="_000_MN2PR05MB608041929BD218AD20575CB1BE290MN2PR05MB6080namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB6080.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 541b8130-8237-42c8-2e84-08d853d21544 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Sep 2020 08:35:03.6003 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Pk0cjR1+8m8ZClgh6rtGEMqJEpjk7YcXaWdnSLJKwUuVULciisfp1xjftagyswVGTRz8fzO2l3gW07yLWS2CEg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB6384 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-08_04:2020-09-08, 2020-09-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 adultscore=0 clxscore=1011 priorityscore=1501 lowpriorityscore=0 phishscore=0 impostorscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 malwarescore=0 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009080079 Archived-At: Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-bess-srv6-services-04 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Sep 2020 08:35:32 -0000 --_000_MN2PR05MB608041929BD218AD20575CB1BE290MN2PR05MB6080namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Can we incorporate this in draft. Juniper Business Use Only From: spring On Behalf Of Rajesh M Sent: Tuesday, September 1, 2020 5:57 PM To: Ketan Talaulikar (ketant) ; gdawra= .ietf@gmail.com; Clarence Filsfils (cfilsfil) ; robert@= raszuk.net; bruno.decraene@orange.com; zhuangshunwan@huawei.com; jorge.raba= dan@nokia.com Cc: spring@ietf.org Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-bess-srv6-serv= ices-04 [External Email. Be cautious of content] May be I was not very clear. My only ask is we must Recommended "BGP next h= op and SRV6 service SID for a BGP route must be derived from the same locat= or" So that we no need to check the reachability to BGP nexthop and then check = the reachability to SRV6 service SID >From the draft section "5. BGP based L3 s= ervice over SRv6" When the egress PE sets the next-hop to a value that is not covered by the SRv6 Locator from which the SRv6 Service SID is allocated, then the ingress PE SHOULD perform reachability check for the SRv6 Service SID in addition to the BGP next-hop reachability procedures. Juniper Business Use Only From: spring > On B= ehalf Of Rajesh M Sent: Saturday, August 22, 2020 8:43 AM To: gdawra.ietf@gmail.com; cfilsfil@cisco.com= ; robert@raszuk.net; b= runo.decraene@orange.com; zhuangshunwan@h= uawei.com; jorge.rabadan@nokia.com Cc: spring@ietf.org Subject: [spring] https://tools.ietf.org/html/draft-ietf-bess-srv6-services= -04 [External Email. Be cautious of content] 5. BGP based L3 service over SRv6 When the egress PE sets the next-hop to a value that is not covered by the = SRv6 Locator from which the SRv6 Service SID is allocated, then the ingress PE SHOULD perform reachability check for the SRv6 Service = SID in addition to the BGP next-hop reachability procedures. I think we should mention, few points for egress side a) Recommended to set the bgp nexthop based upon locator. [KT] I would think that it is difficult to normatively recommend such a thi= ng in the spec. There would be implementation and deployment design aspects= to be considered. b) All the service SIDs across vrfs(DT4,DT6....) must be derived from the s= ame locator (this is independent of setting bgp nexthop) [KT] I am not sure such a restriction is required and in fact would be seve= rely limiting in nature. Consider that some service may wish to leverage a = FlexAlgo based on delay metric computation to get from the ingress to egres= s PE. In such cases, the egress PE can allocate the SRv6 SID for that servi= ce from its FlexAlgo specific locator. Thanks, Ketan Juniper Business Use Only --_000_MN2PR05MB608041929BD218AD20575CB1BE290MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Can we incorporate this in draft.

 

 

Juniper Business Use Only

From: spring <spring-bounces@ietf.org> = On Behalf Of Rajesh M
Sent: Tuesday, September 1, 2020 5:57 PM
To: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.or= g>; gdawra.ietf@gmail.com; Clarence Filsfils (cfilsfil) <cfilsfil@cis= co.com>; robert@raszuk.net; bruno.decraene@orange.com; zhuangshunwan@hua= wei.com; jorge.rabadan@nokia.com
Cc: spring@ietf.org
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-bess-sr= v6-services-04

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

May be I was not very clear. My= only ask is we must Recommended “BGP next hop and SRV6 service SID for a BGP = route must be derived from the same locator”

So that we no need to check the= reachability to BGP nexthop and then check the reachability to SRV6= service SID

 

From the draft section “5.  BGP based L3 service over SRv6”

When the egress PE sets the next-hop to a value that is no= t covered

by the SRv6 Locator from which the SRv6 Service SID is all= ocated,

then the ingress PE SHOULD perform reachability check for = the SRv6

Service SID in addition to the BGP next-hop reachability p= rocedures.

 

 

 

 

Juniper Business Use Only

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

5.  BGP based L3 service over SRv6

When the egress PE sets the next-hop to a value that= is not covered by the SRv6 Locator from which the SRv6 Service SID is allo= cated,

then the ingress PE SHOULD perform reachability chec= k for the SRv6 Service SID in addition to the BGP next-hop reachability pro= cedures.

 

 

I think we should mention, few points for egress side=

a) Recommended to set the bgp nexthop based upon locator.<= o:p>

 

[KT] I would think that it is difficult to nor= matively recommend such a thing in the spec. There would be implementation = and deployment design aspects to be considered.

 

b) All the service SIDs across vrfs(DT4,DT6....) must be d= erived from the same locator (this is independent of setting bgp nexthop)

[KT] I am not sure such a restriction is requi= red and in fact would be severely limiting in nature. Consider that some se= rvice may wish to leverage a FlexAlgo based on delay metric computation to = get from the ingress to egress PE. In such cases, the egress PE can allocate the SRv6 SID for that service fr= om its FlexAlgo specific locator.

 

 

 

Thanks,

Ketan

 

Juniper Business Use Only

--_000_MN2PR05MB608041929BD218AD20575CB1BE290MN2PR05MB6080namp_-- From nobody Tue Sep 8 11:08:33 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B7AD73A0BC8; Tue, 8 Sep 2020 11:08:31 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , X-Test-IDTracker: no X-IETF-IDTracker: 7.16.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159958851173.6820.10542475922462723282@ietfa.amsl.com> Date: Tue, 08 Sep 2020 11:08:31 -0700 Archived-At: Subject: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state "Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Sep 2020 18:08:32 -0000 The SPRING WG has placed draft-mirsky-spring-bfd in state Call For Adoption By WG Issued (entered by Joel Halpern) The document is available at https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ Comment: The authors have requested (quite some time ago) WG adoption for this document. Looking at the archive, there was anot a lot of discussion, and some concerns. Rather than try to infer the current state from the old discussions, the WG Chairs have decided to issue a WG call for adoption. If you support this becoming a WG document, please explain on the list. If you oppose this becoming a WG document, please explain on the list. Silence does not mean consent. Yours, Joel M. 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Sri Karthik Goud" , "spring@ietf.org" CC: Swamy SRK Thread-Topic: PSP and USP uN Flavors Thread-Index: AdZ7Lz2AA+mT+DNyR32P99LVzfPpMQLS/vqQ Date: Wed, 9 Sep 2020 08:13:22 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Enabled=true; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SetDate=2020-08-25T22:29:34Z; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Method=Privileged; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Name=106ee314-308e-4f40-a474-5b984ee7b7ff; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ActionId=98a14009-1467-4322-8d0e-f3eb7ac60356; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ContentBits=2 authentication-results: dmarc.ietf.org; dkim=none (message not signed) header.d=none;dmarc.ietf.org; dmarc=none action=none header.from=cisco.com; x-originating-ip: [173.38.220.42] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b76e45ef-1bdc-4c1a-53c0-08d854983836 x-ms-traffictypediagnostic: MWHPR11MB1791: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: c3aUK/GIbPQxawYzCtf/lLti3mccoIrnpNMPTbTlxKx26PX3NthoIuN0mF5GU+QIJxSg2iOifMbZhIbzXtw3XeBjsICExt5HBJw93F9HwKv1iirTM5xkNhgl+nW0J9Et+Pftw4Av2lhhuhA7YVATnA0byg7PtbsDrR2WtAMKCgFeb33bAlKyMZcaSBrbZ8U6RiqrA447EXhYmtQSdYf/P3uDhQHJSGSylatUeuYGscOzSE5NF+39O5+9npnPSI8WLbQ9yg+P1txOaDo4BQdKUdePmZgqro+cthpgYkdf5iHCFJpbcxil+Zk/VkTpalHNjucd9VbCfNGispp72Q/ZwhP/0A3dut/qvmKHg+QKYZCbLZH8qOQVOQ1CbM1rfBS5fR6Zckm0rRh/cboe22wd+Q== x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MWHPR11MB1374.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(346002)(376002)(366004)(396003)(39860400002)(136003)(186003)(166002)(26005)(86362001)(52536014)(33656002)(55016002)(7696005)(6506007)(2906002)(478600001)(53546011)(8676002)(8936002)(966005)(316002)(76116006)(66946007)(66476007)(4326008)(110136005)(5660300002)(83380400001)(66446008)(66556008)(71200400001)(9686003)(64756008); DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata: 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 x-ms-exchange-transport-forked: True Content-Type: multipart/alternative; boundary="_000_MWHPR11MB13740668044D65F2C8D7116BC9260MWHPR11MB1374namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR11MB1374.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b76e45ef-1bdc-4c1a-53c0-08d854983836 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Sep 2020 08:13:22.3033 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: gmh61/I9qas8ZzlRUIH8dmRshcajpsRrrWuZHGQgz8yu+we4QZ/gzepBtSNY9tFG1CQDCt6uOrN0OXGlQhV3FA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1791 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.15, xch-rcd-005.cisco.com X-Outbound-Node: alln-core-9.cisco.com Archived-At: Subject: Re: [spring] PSP and USP uN Flavors X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2020 08:13:28 -0000 --_000_MWHPR11MB13740668044D65F2C8D7116BC9260MWHPR11MB1374namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Karthik, Please see inline. Cheers, Pablo. From: spring On Behalf Of G. Sri Karthik Goud Sent: mi=E9rcoles, 26 de agosto de 2020 0:30 To: spring@ietf.org Cc: Swamy SRK Subject: [spring] PSP and USP uN Flavors Folks, In draft-filsfils-spring-net-pgm-extension-srv6-usid, a uN represents an in= struction (END, END.T) instantiated on a node. Can that instruction have a = PSP or USP flavor? [PC] The uN behavior is a new behavior. This behavior is defined in https:/= /tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-07#s= ection-4.1.1 The uN behavior may be combined with the PSP, USP or USD flavors. Same appl= ies to the uA behavior. You have the full list of behaviors in Section 9 of the draft. If so, wouldn't the PSP/USP cause an SRH that has not yet been processed to= be deleted? [PC] No. Leveraging the terminology defined in Section 2 of the draft: the = PSP/USP/USD is only executed when you get to the Last uSID of the uSID Cont= ainer. Please have a look at the uN pseudocode in the latest revision of the draft= (rev 7). I believe the pseudocode is clearer than in previous revisions. Thanks, and let me know if unclear. - Karthik Non-Juniper --_000_MWHPR11MB13740668044D65F2C8D7116BC9260MWHPR11MB1374namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Karthik,

 

Please see inline.

 

Cheers,

Pablo.

 

From: spring <spring-bounces@ietf.org> On Behalf Of G. Sri Karthik Goud
Sent: mi=E9rcoles, 26 de agosto de 2020 0:30
To: spring@ietf.org
Cc: Swamy SRK <swamys@juniper.net>
Subject: [spring] PSP and USP uN Flavors

 

Folks,

 

In draft-filsfils-spring-net-pg= m-extension-srv6-usid, a uN represents an instruction (END, END.T) instanti= ated on a node. Can that instruction have a PSP or USP flavor?

[PC] The uN behavior is a= new behavior. This behavior is defined in https:/= /tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-07#s= ection-4.1.1

The uN behavior may be co= mbined with the PSP, USP or USD flavors. Same applies to the uA behavior.

You have the full list of= behaviors in Section 9 of the draft.

 <= /i>

If so, wouldn’t the PSP/U= SP cause an SRH that has not yet been processed to be deleted?

[PC] No. Leveraging the t= erminology defined in Section 2 of the draft: the PSP/USP/USD is only execu= ted when you get to the Last uSID of the uSID Container.<= /i>

Please have a look at the= uN pseudocode in the latest revision of the draft (rev 7). I believe the p= seudocode is clearer than in previous revisions.<= /p>

Thanks, and let me know i= f unclear.

 

- Karthik

 

 

Non-Juniper

--_000_MWHPR11MB13740668044D65F2C8D7116BC9260MWHPR11MB1374namp_-- From nobody Wed Sep 9 01:38:19 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 237A43A110D for ; Wed, 9 Sep 2020 01:38:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JvdWaWFqLDcP for ; Wed, 9 Sep 2020 01:38:16 -0700 (PDT) Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1EEFD3A1108 for ; Wed, 9 Sep 2020 01:38:16 -0700 (PDT) Received: by mail-ed1-x52f.google.com with SMTP id t16so1779204edw.7 for ; Wed, 09 Sep 2020 01:38:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=jkllXs/MKw++fQqTZj9upS7uG4MXO/Duk6vBekpzV+M=; b=EXM6WKBzEt5smAN7yHsWngRBbV8RIV/2wAtHwxVOPdUV3PKVwaTKdCvUP5QWZ6dQIl l+B8IB21OXUHiX0JkwjBrXdWCjY8nTdVI3sbZnZ+rap0v7IFcZn7NMa++AsNIK9jGg+N PPRPK/xBmVBv+WYra4RGiLiKGYMFi/0nElK8Pvv9VBwHXj98VkJ/EriXZyvXDGjqyw+q Za2dDSUZqfNSBndfrjyEG6KxG5GrzSVvhzbQo6cnbJIQt2aRFwqjB+CVrPFHQz/yK/MY P4IXOZty707+uiXMgogIQOaNytqswtVBmi5UK1xXJF2Oi2Cg6cpuVA67sgJ1OXyAvcZX KpOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=jkllXs/MKw++fQqTZj9upS7uG4MXO/Duk6vBekpzV+M=; b=edSAiNQeRe9Z34kRXw1ymBYpx3zD28a9TRcT/1FtBs+pnk9XmYGYmuLzAr3Z8OVbbP /dsBkPdDlWE/WHenBE/QEH/rzO3Aj7rwupWiJnZm4bRpHeoYAg7AMSTfEMyQksLAe+1t R2en23teXn+AI6e4K8ExO6OLHOiPoYK2/h/3NobVDJy44zirPNCKQVXndACMYfAH6p2J mwNAn4tC3uYDYQa/P4zduwdq/AsNS669JFA0s5Smps2WjdtEF4qghrxG2Es45/bxnPjn qUAfYp76fs0f7WimfSDUYUkjJQI3146CrxWvHpb+FZ2+PmiXl28uxPq+qovEINkSbOAm qS0g== X-Gm-Message-State: AOAM533vZ4wOykx/YROFfYNfor8/ITMeqJI8cbOflstQT+uUqBut43OG 9dLe2zj7iYHkJ0VIh3eex63jTHZ2jx0= X-Google-Smtp-Source: ABdhPJy3OyKB+Sfd6k+Bb1LCe6Px/rH6v/+JCpMgxf9EEH9Ks36tumaYsOEAWiSmLllYZAXjmVochw== X-Received: by 2002:a50:8881:: with SMTP id d1mr2982336edd.306.1599640694254; Wed, 09 Sep 2020 01:38:14 -0700 (PDT) Received: from [192.168.1.148] ([151.82.217.12]) by smtp.gmail.com with ESMTPSA id 16sm1355636edx.72.2020.09.09.01.38.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Sep 2020 01:38:13 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Wed, 9 Sep 2020 10:38:12 +0200 Message-Id: <799904D5-864B-4D86-958F-4588F64F464A@gmail.com> References: <22402_1599234564_5F526204_22402_314_1_53C29892C857584299CBF5D05346208A48F58F00@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Cc: Martin Horneffer , "spring@ietf.org" In-Reply-To: <22402_1599234564_5F526204_22402_314_1_53C29892C857584299CBF5D05346208A48F58F00@OPEXCAUBM43.corporate.adroot.infra.ftgroup> To: bruno.decraene@orange.com X-Mailer: iPad Mail (17G80) Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2020 08:38:18 -0000 I=E2=80=99m with Bruno here, and the spec is quite clear on the behavior exp= ected (implementors, please speak up). Given variability and interdependencies in use cases, I=E2=80=99d say, drop s= hould be (and de-jure it is) the default behavior, and if someone wants thei= r vendor of choice to implement a knob to change that - they are free to do s= o (local behavior) as long as consequences are well understood (rope is shor= t). Cheers, Jeff > On Sep 4, 2020, at 17:49, bruno.decraene@orange.com wrote: >=20 > =EF=BB=BFHi Martin, >=20 >> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin >> Horneffer >>=20 >> Hello everyone, >>=20 >> may I come back the the question below? Or rather let me update it a litt= le: >>=20 >> In case an SR-MPLS path is broken, should a node rather drop the packet, >> or forward it? >>=20 >> This can happen whenever the IGP points to a certain next hop, but that >> neither supplies a valid SID, nor allows LDP-stitching for whatever >> reason. For PUSH as well as for CONTINUE. >=20 > Speaking as an individual contributor, my reading of RFC 8660 (SR-MPLS) is= that the packet is dropped ("Otherwise, drop the packet"). > https://www.rfc-editor.org/rfc/rfc8660.html#name-forwarding-for-push-and-c= on >=20 > However that could be seen as a local behavior, hence possibly configurabl= e. >=20 > As a network operator,=20 > - I understand your use case. > - I equally understand the use case of someone preferring/requiring the pa= cket to be dropped, e.g. in the VPN case where the isolation is the main req= uirement. >=20 > Best regards, > --Bruno >=20 >=20 >> We have been using MPLS transport and a BGP free core since about two >> decades now, using LDP. In the analog case, LDP creates "unlabelled" >> entries in the LFIB, does the equivalent of a POP operation and forwards >> the packet to the next-hop as chosen by the IGP. >>=20 >> This behavior obviously breaks any traffic that relies on a service >> label, but it can protect some traffic. >> In our case a huge percentage of all traffic still is public IPv4. This >> needs MPLS only for a transport label, be it LDP or SR-MPLS. If this >> traffic gets forwarded unlabelled, it follows an IGP default route to a >> central device, where it is 1) redirected to the correct destination and >> 2) counted in a way that operators can quickly see whether and where >> this kind of failure occurs at some point in the network. >>=20 >> After more operational experience and several internal discussions we >> agreed that we want packets to be forwarded unlabelled rather than >> dropped. Anyone to share, or oppose this position? >>=20 >> Best regards, Martin >>=20 >>=20 >>> Am 31.01.20 um 16:50 schrieb Martin Horneffer: >>> Hello everyone, >>>=20 >>> again it seems the interesting questions only show up when applying >>> something to the live network... >>>=20 >>> We ran into something that poses a question related to RFC8660: What >>> is the exact meaning of section 2.10.1, "Forwarding for PUSH and >>> CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a >>> valid MPLS path? >>>=20 >>> The relevant sections reads: >>>=20 >>> - Else, if there are other usable next hops, use them to forward >>> the incoming packet. The method by which the router "R0" >>> decides on the possibility of using other next hops is beyond >>> the scope of this document. For example, the MCC on "R0" may >>> chose the send an IPv4 packet without pushing any label to >>> another next hop. >>>=20 >>> Does the part "send an IPv4 packet without pushing any label" apply to >>> PUSH and CONTINUE, or just to PUSH? >>> Does R0 have to validate that neighbor N can correctly process to >>> packet? Or can it forward the packet regardless? >>>=20 >>> The reason for asking is that we are now seeing issues similar to ones >>> we had when starting with LDP based MPLS about two decades ago: >>> traffic being black holed even though a path to the destination >>> exists, because the MPLS path is interrupted somewhere in the middle. >>>=20 >>> With LDP we know the case of LFIBentries called "unlabelled". While >>> this does break connectivity for many kinds of service, e.g. those >>> relying on an additional service labels, it still works for plain >>> IP(v4) traffic. In our cases, this works perfectly fine for all >>> internal routing and control traffic. And even for IPv4 traffic that >>> gets collected by a central router that injects a default route. >>>=20 >>> However, depending on the exact interpretation of the above paragraph, >>> an implementor might feel obliged to chose the next paragraph: >>>=20 >>> - Otherwise, drop the packet. >>>=20 >>> Which is, at least in our case, very unfortunate... >>>=20 >>> Any advice or opinion appreciated! >>>=20 >>>=20 >>> Best regards, Martin >>>=20 >>>=20 >>>=20 >>>=20 >>> _______________________________________________ >>> spring mailing list >>> spring@ietf.org >>> https://www.ietf.org/mailman/listinfo/spring >>=20 >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring >=20 > __________________________________________________________________________= _______________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations confide= ntielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez rec= u ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages e= lectroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme ou= falsifie. Merci. >=20 > This message and its attachments may contain confidential or privileged in= formation that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and del= ete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have been= modified, changed or falsified. > Thank you. >=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Wed Sep 9 02:00:23 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65BCE3A111D for ; Wed, 9 Sep 2020 02:00:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.576 X-Spam-Level: X-Spam-Status: No, score=-1.576 tagged_above=-999 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I definitely concur with Jeff: Drop should be the default MUST-to-implement= behavior.
What's more, it looks to me as the only possible behavior if the problemati= c label is not BoS.

And even if popping of the problematic BoS label is allowed by local config= uration, some mechanism for identifying the resulting packet as IPv4 or IPv= 6 (or neither - I am aware of at least one vendor who has implemented nati= ve L2 transport directly over LSPs without "service labels" years= ago), should be used.

My 2c,
Sasha

Office: +972-39266302
Cell: +972-549266302
Email: Alexander.Vain= shtein@ecitele.com

-----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of Jeff Tantsura
Sent: Wednesday, September 9, 2020 11:38 AM
To: bruno.decraene@orange.com<= /a>
Cc: spring@ietf.org; Martin Horneffer <maho@lab.dtag.de>
Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC= 8660)

I=E2=80=99m with Bruno here, and the spec is quite clear on the behavior ex= pected (implementors, please speak up).
Given variability and interdependencies in use cases, I=E2=80=99d say, drop= should be (and de-jure it is) the default behavior, and if someone wants t= heir vendor of choice to implement a knob to change that - they are free to= do so (local behavior) as long as consequences are well understood (rope i= s short).

Cheers,
Jeff

> On Sep 4, 2020, at 17:49, bruno.decraene@orange.com wrote:
>
> =EF=BB=BFHi Martin,
>
>> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin =
>> Horneffer
>>
>> Hello everyone,
>>
>> may I come back the the question below? Or rather let me update it= a little:
>>
>> In case an SR-MPLS path is broken, should a node rather drop the <= BR> >> packet, or forward it?
>>
>> This can happen whenever the IGP points to a certain next hop, but=
>> that neither supplies a valid SID, nor allows LDP-stitching for >> whatever reason. For PUSH as well as for CONTINUE.
>
> Speaking as an individual contributor, my reading of RFC 8660 (SR-MPLS= ) is that the packet is dropped ("Otherwise, drop the packet"). > https://clicktime.symantec.com/3Ac6NfmLToD= 6pwruqraPjMn6H2?u=3Dhttps%3A%2
> F%2Fwww.rfc-editor.org%2Frfc%2Frfc8660.html%23name-forwarding-for-push=
> -and-con
>
> However that could be seen as a local behavior, hence possibly configu= rable.
>
> As a network operator,
> - I understand your use case.
> - I equally understand the use case of someone preferring/requiring th= e packet to be dropped, e.g. in the VPN case where the isolation is the mai= n requirement.
>
> Best regards,
> --Bruno
>
>
>> We have been using MPLS transport and a BGP free core since about = two
>> decades now, using LDP. In the analog case, LDP creates "unla= belled"
>> entries in the LFIB, does the equivalent of a POP operation and >> forwards the packet to the next-hop as chosen by the IGP.
>>
>> This behavior obviously breaks any traffic that relies on a servic= e
>> label, but it can protect some traffic.
>> In our case a huge percentage of all traffic still is public IPv4.=
>> This needs MPLS only for a transport label, be it LDP or SR-MPLS. = If
>> this traffic gets forwarded unlabelled, it follows an IGP default =
>> route to a central device, where it is 1) redirected to the correc= t
>> destination and
>> 2) counted in a way that operators can quickly see whether and whe= re
>> this kind of failure occurs at some point in the network.
>>
>> After more operational experience and several internal discussions= we
>> agreed that we want packets to be forwarded unlabelled rather than=
>> dropped. Anyone to share, or oppose this position?
>>
>> Best regards, Martin
>>
>>
>>> Am 31.01.20 um 16:50 schrieb Martin Horneffer:
>>> Hello everyone,
>>>
>>> again it seems the interesting questions only show up when app= lying
>>> something to the live network...
>>>
>>> We ran into something that poses a question related to RFC8660= : What
>>> is the exact meaning of section 2.10.1, "Forwarding for P= USH and
>>> CONTINUE of Global SIDs", when the chosen neighbor doesn'= t provide a
>>> valid MPLS path?
>>>
>>> The relevant sections reads:
>>>
>>> - Else, if there are other usable next hops, use them t= o forward
>>> the incoming packet. The method by which the router = "R0"
>>> decides on the possibility of using other next hops i= s beyond
>>> the scope of this document. For example, the MCC on = "R0" may
>>> chose the send an IPv4 packet without pushing any lab= el to
>>> another next hop.
>>>
>>> Does the part "send an IPv4 packet without pushing any la= bel" apply
>>> to PUSH and CONTINUE, or just to PUSH?
>>> Does R0 have to validate that neighbor N can correctly process= to
>>> packet? Or can it forward the packet regardless?
>>>
>>> The reason for asking is that we are now seeing issues similar= to
>>> ones we had when starting with LDP based MPLS about two decade= s ago:
>>> traffic being black holed even though a path to the destinatio= n
>>> exists, because the MPLS path is interrupted somewhere in the = middle.
>>>
>>> With LDP we know the case of LFIBentries called "unlabell= ed". While
>>> this does break connectivity for many kinds of service, e.g. t= hose
>>> relying on an additional service labels, it still works for pl= ain
>>> IP(v4) traffic. In our cases, this works perfectly fine for al= l
>>> internal routing and control traffic. And even for IPv4 traffi= c that
>>> gets collected by a central router that injects a default rout= e.
>>>
>>> However, depending on the exact interpretation of the above >>> paragraph, an implementor might feel obliged to chose the next= paragraph:
>>>
>>> - Otherwise, drop the packet.
>>>
>>> Which is, at least in our case, very unfortunate...
>>>
>>> Any advice or opinion appreciated!
>>>
>>>
>>> Best regards, Martin
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> spring mailing list
>>> spring@ietf.org
>>> https://clicktime.symantec.com/3Upp6= EVdxhZf2uCjs3V6nAi6H2?u=3Dhttps%3A
>>> %2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fspring
>>
>> _______________________________________________
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>> https://clicktime.symantec.com/3Upp6EVd= xhZf2uCjs3V6nAi6H2?u=3Dhttps%3A%
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ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F26D3A0CA9; Wed, 9 Sep 2020 07:04:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.16.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <159966026415.24917.11535696969105202071@ietfa.amsl.com> Date: Wed, 09 Sep 2020 07:04:24 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-sr-policy-yang-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2020 14:04:25 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : YANG Data Model for Segment Routing Policy Authors : Kamran Raza Robert Sawaya Zhuang Shunwan Daniel Voyer Muhammad Durrani Satoru Matsushima Vishnu Pavan Beeram Filename : draft-ietf-spring-sr-policy-yang-00.txt Pages : 47 Date : 2020-09-09 Abstract: This document defines a YANG data model for Segment Routing (SR) Policy that can be used for configuring, instantiating, and managing SR policies. The model is generic and apply equally to the MPLS and SRv6 instantiations of SR policies. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-sr-policy-yang/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-sr-policy-yang-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-policy-yang-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Sep 9 07:18:44 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 315B43A0D82; Wed, 9 Sep 2020 07:18:43 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.16.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <159966112317.4435.17348087376036160751@ietfa.amsl.com> Date: Wed, 09 Sep 2020 07:18:43 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-yang-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2020 14:18:43 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : YANG Data Model for SRv6 Base and Static Authors : Kamran Raza Sonal Agarwal Xufeng Liu Zhibo Hu Iftekhar Hussain Himanshu Shah Daniel Voyer Satoru Matsushima Katsuhiro Horiba Ahmed AbdelSalam Jaganbabu Rajamanickam Filename : draft-ietf-spring-srv6-yang-00.txt Pages : 76 Date : 2020-09-09 Abstract: This document describes a YANG data model for Segment Routing IPv6 (SRv6) base. The model serves as a base framework for configuring and managing an SRv6 subsystem and expected to be augmented by other SRv6 technology models accordingly. Additionally, this document also specifies the model for the SRv6 Static application. The YANG modules in this document conform to the Network Management Datastore Architecture (NMDA). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-yang/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-yang-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-yang-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Sep 9 08:17:03 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13CC03A0D99; Wed, 9 Sep 2020 08:17:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.095 X-Spam-Level: X-Spam-Status: No, score=-2.095 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 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<3815_1596111875_5F22BC03_3815_57_2_53C29892C857584299CBF5D05346208A48F028F5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <3815_1596111875_5F22BC03_3815_57_2_53C29892C857584299CBF5D05346208A48F028F5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48F644B0OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2020 15:17:03 -0000 --_000_53C29892C857584299CBF5D05346208A48F644B0OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi authors, SPRING WG. There is support for this Informational document and no blocking objections= so we have a new WG document. Authors, please resubmit as a WG document. In the next (-01) revision, please include a section (or at least text) dis= cussing to the applicability of the protection as there has been a signific= ant thread on this point. Such as when to avoid bypass / how to tell when t= o avoid bypass and highlighting the limitations that a network operator mi= ght face. Thanks, Regards, Bruno, Jim, Joel From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Thursday, July 30, 2020 2:25 PM To: spring@ietf.org Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Subject: [spring] WG adoption call for draft-hegde-spring-node-protection-f= or-sr-te-paths Hi SPRING WG, Authors of draft-hegde-spring-node-protection-for-sr-te-paths [1] have ask= ed for WG adoption. Please indicate your support, comments, or objection, for adopting this dra= ft as a working group item by August 20th 2020. (*) Could those who are willing to work on this document, please notify the lis= t. That gives us an indication of the energy level in the working group to = work on this. Thanks, Regards, Bruno, Jim, Joel [1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-t= e-paths-07 (*) 3 weeks to account for the IETF meeting week and the august/summer peri= od. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48F644B0OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi authors, SPRING WG.

 

There is support for this Informational document and no blocking objections so we have a new WG document.

Authors, please resubmit as a WG document.

 

In the next (-01) revision, please include a section (or at least text) discussing to the applicability of the protec= tion as there has been a significant thread on this point. Such as when to = avoid bypass / how to tell when to avoid bypass  and highlighting the limitati= ons that a network operator might face.

 

Thanks,

Regards,

Bruno, Jim, Joel

 

From: spring [mailto:spring-bounces@ietf.org] On= Behalf Of bruno.decraene@orange.com
Sent: Thursday, July 30, 2020 2:25 PM
To: spring@ietf.org
Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org
Subject: [spring] WG adoption call for draft-hegde-spring-node-prote= ction-for-sr-te-paths

 

Hi SPRING WG,

 

Authors of draft-hegde-spring-node-protection-for-sr-te-paths  [1] have asked for WG adoption.

 

Please indicate your support, comments, or objection, for adopting this = draft as a working group item by August 20th 2020. (*)

 

Could those who are willing to work on this document, please notify the = list. That gives us an indication of the energy level in the working group = to work on this.

 

Thanks,

Regards,

Bruno, Jim, Joel

 

[1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-te-pa= ths-07

(*) 3 weeks to account for the IETF meeting week and the august/summer p= eriod.

 

______________________________________________________________________=
___________________________________________________
 
Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
If you have received this email in error, please notify the sender and=
 delete this message and its attachments.
As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.
Thank you.
______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
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Wed, 9 Sep 2020 15:40:38 +0000 From: Shraddha Hegde To: "bruno.decraene@orange.com" , "spring@ietf.org" , "draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org" Thread-Topic: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths Thread-Index: AdZmaxBja895PvK+QsirQTKFBBYlewgTcQ5gAAGlEcA= Date: Wed, 9 Sep 2020 15:40:37 +0000 Message-ID: References: <3815_1596111875_5F22BC03_3815_57_2_53C29892C857584299CBF5D05346208A48F028F5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <18426_1599664618_5F58F1EA_18426_334_1_53C29892C857584299CBF5D05346208A48F644B0@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <18426_1599664618_5F58F1EA_18426_334_1_53C29892C857584299CBF5D05346208A48F644B0@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-09-09T15:40:34Z; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Sure. I'll submit the name changed and will close few other comments includ= ing the ones you mentioned received during adoption call in the -01 version= . Rgds Shraddha Juniper Business Use Only From: bruno.decraene@orange.com Sent: Wednesday, September 9, 2020 8:47 PM To: spring@ietf.org; draft-hegde-spring-node-protection-for-sr-te-paths@iet= f.org Subject: RE: [spring] WG adoption call for draft-hegde-spring-node-protecti= on-for-sr-te-paths [External Email. Be cautious of content] Hi authors, SPRING WG. There is support for this Informational document and no blocking objections= so we have a new WG document. Authors, please resubmit as a WG document. In the next (-01) revision, please include a section (or at least text) dis= cussing to the applicability of the protection as there has been a signific= ant thread on this point. Such as when to avoid bypass / how to tell when t= o avoid bypass and highlighting the limitations that a network operator mi= ght face. Thanks, Regards, Bruno, Jim, Joel From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Thursday, July 30, 2020 2:25 PM To: spring@ietf.org Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Subject: [spring] WG adoption call for draft-hegde-spring-node-protection-f= or-sr-te-paths Hi SPRING WG, Authors of draft-hegde-spring-node-protection-for-sr-te-paths [1] have ask= ed for WG adoption. Please indicate your support, comments, or objection, for adopting this dra= ft as a working group item by August 20th 2020. (*) Could those who are willing to work on this document, please notify the lis= t. That gives us an indication of the energy level in the working group to = work on this. Thanks, Regards, Bruno, Jim, Joel [1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-t= e-paths-07 (*) 3 weeks to account for the IETF meeting week and the august/summer peri= od. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_CY4PR05MB35767E7AB424CA326BC27EC8D5260CY4PR05MB3576namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Sure. I’ll submit the name changed and will cl= ose few other comments including the ones you mentioned received during ado= ption call in the -01 version.

 

Rgds

Shraddha

 

 

Juniper Business Use Only

From: bruno.decraene@orange.com <bruno.dec= raene@orange.com>
Sent: Wednesday, September 9, 2020 8:47 PM
To: spring@ietf.org; draft-hegde-spring-node-protection-for-sr-te-pa= ths@ietf.org
Subject: RE: [spring] WG adoption call for draft-hegde-spring-node-p= rotection-for-sr-te-paths

 

<= span lang=3D"FR" style=3D"font-size:10.5pt;font-family:"Lato",san= s-serif;color:black">[External Email. Be cautious of content]

 

Hi auth= ors, SPRING WG.

&n= bsp;

There i= s support for this Informational document and no blocking objections so we = have a new WG document.

Authors= , please resubmit as a WG document.

&n= bsp;

In the = next (-01) revision, please include a section (or at least text) discussing= to the applicability of the protection as there has been a significant thr= ead on this point. Such as when to avoid bypass / how to tell when to avoid bypass  and highlighting the limit= ations that a network operator might face.

&n= bsp;

Thanks,=

Regards= ,

Bruno, = Jim, Joel

&n= bsp;

From: spr= ing [mailto:spring-bounces@ietf.= org] On Behalf Of bruno.decr= aene@orange.com
Sent: Thursday, July 30, 2020 2:25 PM
To: spring@ietf.org
Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org
Subject: [spring] WG adoption call for draft-hegde-spring-node-prote= ction-for-sr-te-paths

 

Hi SPRING WG,=

 

Authors of draft-hegde-spring-n= ode-protection-for-sr-te-paths  [1] have asked for WG adoption.

 

Please indicate your support, c= omments, or objection, for adopting this draft as a working group item by A= ugust 20th 2020. (*)

 

Could those who are willing to = work on this document, please notify the list. That gives us an indication = of the energy level in the working group to work on this.=

 

Thanks,

Regards,

Bruno, Jim, Joel

 

[1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-te-pa= ths-07

(*) 3 weeks to account for the = IETF meeting week and the august/summer period.

 

____________________________________________________=
_____________________________________________________________________<=
/o:p>
 
Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.
 
This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;
they should not be distributed, used or copied witho=
ut authorisation.
If you have received this email in error, please not=
ify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.

Thank you.


____________________________________________________=
_____________________________________________________________________<=
/o:p>
 
Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.
 
This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;
they should not be distributed, used or copied witho=
ut authorisation.
If you have received this email in error, please not=
ify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.

Thank you.
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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi All, Section 4.1.21: In control plane uA SID is advertised with value 2001:db8:0:0N00:FNAJ:: in FIB entry it is represent with value 2001:db8:0:FNAJ::/64 Note: From a formal viewpoint, a uA SID of node N is defined by the local FIB entry B:uA/64 of N (i.e. this definition is independent from any = uN SID of node N). a) why such discrepancy ? between control plane and forwarding plane. b) for uA SID Forwarding happens based upon 2001:db8:0/48 ? not based upon = 2001:db8:0:0N00 (uN SID) ? uSID block: 2001:db8:0::/48 for uA SID if forwarding is based upon 2001:db8:0/48 then Compressed-SID= can be 16 bit for uA SID if forwarding is based upon 2001:db8:0:0N00 then Compressed-S= ID must be 32 bit Thanks Rajesh Juniper Business Use Only --_000_MN2PR05MB608010C6E0064CC127B39B1ABE270MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable --_000_MN2PR05MB608010C6E0064CC127B39B1ABE270MN2PR05MB6080namp_-- From nobody Thu Sep 10 03:06:30 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E1F5C3A128E for ; 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10 Sep 2020 10:06:22 +0000 Received: from [10.147.24.22] ([10.147.24.22]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 08AA6MXp010376; Thu, 10 Sep 2020 10:06:22 GMT To: Rajesh M , SPRING WG References: From: Peter Psenak Message-ID: Date: Thu, 10 Sep 2020 12:06:22 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.147.24.22, [10.147.24.22] X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [spring] draft-filsfils-spring-net-pgm-extension-srv6-usid-07 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Sep 2020 10:06:29 -0000 Hi Rajesh, On 10/09/2020 03:38, Rajesh M wrote: > Hi All, > > *Section 4.1.21:* > > ** > > In control plane uA SID is advertised with value 2001:db8:0:*0N00:FNAJ::* > > ** > > *in FIB entry it is represent with value *2001:db8:0*:FNAJ::/64* > > Note: From a formal viewpoint, a uA SID of node N is defined by the > > local FIB entry B:uA/64 of N (i.e. this definition is independent from > any uN SID of node N). > > a) why such discrepancy ? between control plane and forwarding plane. It's explained in the section 4.1.2.1: "In order to signal in ISIS a container SID with the same routable semantics as End.X" In other words, we wanted to keep the consistency in a way the SID is advertised for different SID types (e.g. END.X and uA). thanks, Peter > > b) for uA SID Forwarding happens based upon 2001:db8:0/48 ? not based > upon 2001:db8:0:*0N00 (uN SID) ?* > > **uSID block: 2001:db8:0::/48** > > **for uA SID if forwarding is based upon**2001:db8:0/48 then > Compressed-SID can be 16 bit > >    for uA SID if forwarding is based upon**2001:db8:0:*0N00 then > *Compressed-SID must be 32 bit** > > ** > > Thanks > > Rajesh > > ** > > > Juniper Business Use Only > From nobody Thu Sep 10 03:45:32 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D20D93A08BA; Thu, 10 Sep 2020 03:45:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: 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11:43:03 +0000 From: Shraddha Hegde To: "bruno.decraene@orange.com" , "draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org" CC: "spring@ietf.org" Thread-Topic: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths Thread-Index: AdZmaxBja895PvK+QsirQTKFBBYlewgMNufgAFqWvsA= Date: Fri, 11 Sep 2020 11:43:03 +0000 Message-ID: References: <3815_1596111875_5F22BC03_3815_57_2_53C29892C857584299CBF5D05346208A48F028F5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <28149_1599664617_5F58F1E9_28149_171_1_53C29892C857584299CBF5D05346208A48F644A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <28149_1599664617_5F58F1E9_28149_171_1_53C29892C857584299CBF5D05346208A48F644A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-09-11T11:42:58Z; 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scancount=1 engine=8.12.0-2006250000 definitions=main-2009110096 Archived-At: Subject: Re: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Sep 2020 11:43:15 -0000 --_000_CY4PR05MB3576EE5A33F8B0DBE1E28305D5240CY4PR05MB3576namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Bruno, Thanks for the review and comments. Pls see inline for replies. Juniper Business Use Only From: bruno.decraene@orange.com Sent: Wednesday, September 9, 2020 8:47 PM To: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Cc: spring@ietf.org Subject: RE: [spring] WG adoption call for draft-hegde-spring-node-protecti= on-for-sr-te-paths [External Email. Be cautious of content] Hi authors, all, As an individual contributor, I have two non-blocking comments. 1. I feel that the terminology "node protection" in the name of the dra= ft could be misleading. "Node Protection" is already used in [LFA] and [RLFA]. It refers to a prope= rty of the alternate path avoiding the next node on the path to the egress/= destination. It does not change the destination/egress. It looks to me that the function been proposed in the draft is more along [= Egress Protection] which protects from the failure of the egress/destinatio= n, and hence do change the destination/egress. (full disclosure, I'm co-aut= hor of [Egress Protection] ) I think that both are different and that properties are different, hence us= ing the same name is misleading. In particular, in the first one, the destination/egress is unchanged and he= nce properties of the destination/egress is unchanged: no problem. While in= the second case, a node (a 'protector' in [Egress Protection]) is claiming= to provide a similar service, but possibly only a subset of the original s= ervices or without the stateful states). Cf some discussion on the mailing = list along "How do I know that I can safely pretend that I'm the original d= estination?" Personally I would propose to replace "Node Protection" by "Segment Protect= ion" or "Segment Egress Protection" or "IGP Segment Egress Protection" sinc= e the proposal seem restricted to IGP knowledge. I agree that using the term node protection is confusing. I thin= k that "segment protection" is the right term. Using egress keyword may = cause other confusions because term egress is used in egress protection RFC= s to mean the egress nodes on which the services reside. In this draft the = focus is on nodes that are not egresses. [LFA] https://tools.ietf.org/html/rfc5286 [RLFA node protection] https://tools.ietf.org/html/rfc8102 [Egress Protection] https://tools.ietf.org/html/rfc8679 1. At best, the proposal ignores [Egress Protection]. At worst, the draf= t breaks [Egress Protection] Both do not seem to co-operate. Actually, egress protection as defined in RFC 8679 works well wi= th procedures defined in this draft. Section 3.4 briefly talks about this. Initial versions of this draft had examples to describe how egress protecti= on works in conjunction with procedures described in this draft. Basically, egress protection described in RFC 8679 uses a context-id and co= ntext label. When the penultimate hop creates protection for the context-id= routes It follows the procedures described in RFC 8679 ( in conjunction with mirro= r-sid for SR networks). We also have a simplified version of RFC 8679 which= uses anycast SIDs and static service labels Described in draft-hegde-rtgwg-egress-protection-sr-network. This anycast b= ased egress protection also works well with protection procedures described= in this document. I'll add a section with examples to describe this which can help clarify. The draft applies the egress protection even though it can only protections= IGP segments/labels while [Egress Protection] would provide a much broader= protection, including service (e.g. VPNs) protection. Hence it seems to br= eak [Egress Protection] VPN service protection. No this draft does not break VPN service protection. I'll add de= tailed examples. I would propose that the draft refers a bit more to [Egress Protection], us= es its terminology if/when appropriate and then elaborate on the above issu= e. From a technical standpoint, I would propose to privilege the use of a (= complete) Protector (as per [Egress Protection] ) if available. This draft makes use of looking up the second label in the stack= for protection. It is different from protector based approach. draft-hu-spring-segment-routing-proxy-forwarding Is more closer to protecto= r based approach I think. It comes with an overhead of configuring the primary and proxy pairs for set of nodes. Finally, as also raised by Zhibo, the scalability properties of the draft i= s not optimal, and in particular less optimal than [Egress Protection]. I'll add some more text on scalability. Section 5 of the draft p= roposes an optimisation to reduce scale. Indeed, most of the work/states is on a Protector node (having the context = mpls forwarding table). For a given failure, [Egress Protection] allows for= a single Protector while this drafts requires N Protectors (one per neighb= our). So more states in the network and on nodes. Also [Egress Protection] = allows to distribute this load while the draft requires the PLR to handle t= he protection for all its neighbhors. Since this draft restricts to IGP Segments, the scalability impact his limi= ted but still exist. (on the pro side, the draft avoids the additional transport cost/delay requ= ired to reach the Protector (since PLR and Protector are co-located)/ Fair point. I would see the advantage of this draft is more from= operational perspective since it does not require primary protector config= s. Enabling the feature with one single knob on the router will be good enough= . Regards, Bruno From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Thursday, July 30, 2020 2:25 PM To: spring@ietf.org Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Subject: [spring] WG adoption call for draft-hegde-spring-node-protection-f= or-sr-te-paths Hi SPRING WG, Authors of draft-hegde-spring-node-protection-for-sr-te-paths [1] have ask= ed for WG adoption. Please indicate your support, comments, or objection, for adopting this dra= ft as a working group item by August 20th 2020. (*) Could those who are willing to work on this document, please notify the lis= t. That gives us an indication of the energy level in the working group to = work on this. Thanks, Regards, Bruno, Jim, Joel [1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-t= e-paths-07 (*) 3 weeks to account for the IETF meeting week and the august/summer peri= od. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_CY4PR05MB3576EE5A33F8B0DBE1E28305D5240CY4PR05MB3576namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Bruno,

 

Thanks for the review and comments.

Pls see inline for replies.

 

 

Juniper Business Use Only

From: bruno.decraene@orange.com <bruno.dec= raene@orange.com>
Sent: Wednesday, September 9, 2020 8:47 PM
To: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org
Cc: spring@ietf.org
Subject: RE: [spring] WG adoption call for draft-hegde-spring-node-p= rotection-for-sr-te-paths

 

<= span lang=3D"FR" style=3D"font-size:10.5pt;font-family:"Lato",san= s-serif;color:black">[External Email. Be cautious of content]

 

Hi auth= ors, all,

&n= bsp;

As an i= ndividual contributor, I have two non-blocking comments.<= /p>

&n= bsp;

  1. I feel that the terminology “node protectionR= 21;  in the name of the draft could be misleading.

=  

“= Node Protection” is already used in [LFA] and [RLFA]. It refers to a = property of the alternate path avoiding the next node on the path to the eg= ress/destination. It does not change the destination/egress.

It look= s to me that the function been proposed in the draft is more along [Egress = Protection] which protects from the failure of the egress/destination, and = hence do change the destination/egress. (full disclosure, I’m co-author of [Egress Protection] )<= /span>

&n= bsp;

I think= that both are different and that properties are different, hence using the= same name is misleading.

In part= icular, in the first one, the destination/egress is unchanged and hence pro= perties of the destination/egress is unchanged: no problem. While in the se= cond case, a node (a ‘protector’ in [Egress Protection]) is claiming to provide a similar service, but possibly only a= subset of the original services or without the stateful states). Cf some d= iscussion on the mailing list along “How do I know that I can safely = pretend that I’m the original destination?”

 

&n= bsp;

Persona= lly I would propose to replace “Node Protection” by “Segm= ent Protection” or “Segment Egress Protection” or “= IGP Segment Egress Protection” since the proposal seem restricted to = IGP knowledge.

<Shraddha> I agree that u= sing the term node protection is confusing. I think that “segment pro= tection” is the  right  term.  Using egress keyword ma= y cause other confusions because term egress is used in egress protection RFCs to mean the egress nodes on which the services reside. In this draft = the focus is on nodes that are not egresses.

&n= bsp;

[LFA] <= a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc5286__;= !!NEt6yMaO-gk!R3XqSiUA_cgf3gc_cZUjOGXAwIop0rKnceS8EvU9vxvgY_DVneweAP5Zs8bjD= j_k$"> https://tools.ietf.org/html/rfc5286

[RLFA node= protection] https://tools.ietf.org/html/rfc8102

[Egress= Protection] https://tools.ietf.org/html/rfc8679

 

&n= bsp;

  1. At best, the proposal ignores [Egress Protection]. At = worst, the draft breaks [Egress Protection]

&n= bsp;

Both do= not seem to co-operate.

<Shraddha> Actually, egre= ss protection as defined in RFC 8679 works well with procedures defined in = this draft. Section 3.4 briefly talks about this.

Initial versions of this draft = had examples to describe how egress protection works in conjunction with pr= ocedures described in this draft.

Basically, egress protection de= scribed in RFC 8679 uses a context-id and context label. When the penultima= te hop creates protection for the context-id routes

It follows the procedures descr= ibed in RFC 8679 ( in conjunction with mirror-sid for SR networks). We also= have a simplified version of RFC 8679 which uses anycast SIDs and static s= ervice labels

Described in draft-hegde-rtgwg-= egress-protection-sr-network. This anycast based egress protection also wor= ks well with protection procedures described in this document.

I’ll add a section with e= xamples to describe this which can help clarify.

 

The dra= ft applies the egress protection even though it can only protections IGP se= gments/labels while [Egress Protection] would provide a much broader protec= tion, including service (e.g. VPNs) protection. Hence it seems to break [Egress Protection] VPN service protection.

<Shraddha> No this draft = does not break VPN service protection. I’ll add detailed examples.

 

I would= propose that the draft refers a bit more to [Egress Protection], uses its = terminology if/when appropriate and then elaborate on the above issue. From= a technical standpoint, I would propose to privilege the use of a (complete) Protector (as per [Egress Protection]= ) if available.

<Shraddha> This draft mak= es use of looking up the second label in the stack for protection. It is di= fferent from protector based approach.

draft-hu-spring-segment-routing= -proxy-forwarding Is more closer to protector based approach I think. It co= mes with an overhead of  configuring the

primary and proxy pairs for set= of nodes.

&n= bsp;

Finally= , as also raised by Zhibo, the scalability properties of the draft is not o= ptimal, and in particular less optimal than [Egress Protection].

<Shraddha>I’ll add = some more text on scalability.  Section 5 of the draft proposes an opt= imisation to reduce scale.

Indeed,= most of the work/states is on a Protector node (having the context mpls fo= rwarding table). For a given failure, [Egress Protection] allows for a sing= le Protector while this drafts requires N Protectors (one per neighbour). So more states in the network and on nod= es. Also [Egress Protection] allows to distribute this load while the draft= requires the PLR to handle the protection for all its neighbhors.

Since t= his draft restricts to IGP Segments, the scalability impact his limited but= still exist.

(on the= pro side, the draft avoids the additional transport cost/delay required to= reach the Protector (since PLR and Protector are co-located)/

<Shraddha> Fair point. I = would see the advantage of this draft is more from operational perspective = since it does not require primary protector configs.

Enabling the feature with one s= ingle knob on the router will be good enough.

Regards= ,

Bruno

&n= bsp;

&n= bsp;

From: spr= ing [mailto:spring-bounces@ietf.= org] On Behalf Of bruno.decr= aene@orange.com
Sent: Thursday, July 30, 2020 2:25 PM
To: spring@ietf.org
Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org
Subject: [spring] WG adoption call for draft-hegde-spring-node-prote= ction-for-sr-te-paths

 

Hi SPRING WG,=

 

Authors of draft-hegde-spring-n= ode-protection-for-sr-te-paths  [1] have asked for WG adoption.

 

Please indicate your support, c= omments, or objection, for adopting this draft as a working group item by A= ugust 20th 2020. (*)

 

Could those who are willing to = work on this document, please notify the list. That gives us an indication = of the energy level in the working group to work on this.=

 

Thanks,

Regards,

Bruno, Jim, Joel

 

[1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-te-pa= ths-07

(*) 3 weeks to account for the = IETF meeting week and the august/summer period.

 

____________________________________________________=
_____________________________________________________________________<=
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boundary="_000_DM6PR05MB6348C91C3934A9B935CB68BEAE240DM6PR05MB6348namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR05MB6348.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 532ae7ed-b246-4b05-6de8-08d85667b39b X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2020 15:31:06.7043 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Mj1lmTeCeGo8AIoygqVOJZ5MoET3IP0tet/9phnmxlbw+8qkbXssmXi/u70KOs16gIyBRkX6Eb+ImCoRuVRU1w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR05MB5017 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-11_05:2020-09-10, 2020-09-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 malwarescore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 adultscore=0 phishscore=0 suspectscore=0 bulkscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009110126 Archived-At: Subject: Re: [spring] PSP and USP uN Flavors X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Sep 2020 15:31:26 -0000 --_000_DM6PR05MB6348C91C3934A9B935CB68BEAE240DM6PR05MB6348namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Pablo, Assume the following packet: * Destination address is a uSID container * Next header is an SRH In this case, you wouldn't process the SRH until you process every uSID in = the uSID container. Do I have this much right? So, if any uSID in the container specified the PSP or USP flavor, you would= delete an SRH that has not yet been processed. Do I have this right? Ron Non-Juniper From: spring On Behalf Of Pablo Camarillo (pcamar= il) Sent: Wednesday, September 9, 2020 4:13 AM To: G. Sri Karthik Goud ; spring@i= etf.org Cc: Swamy SRK Subject: Re: [spring] PSP and USP uN Flavors [External Email. Be cautious of content] Hi Karthik, Please see inline. Cheers, Pablo. From: spring > On B= ehalf Of G. Sri Karthik Goud Sent: mi=E9rcoles, 26 de agosto de 2020 0:30 To: spring@ietf.org Cc: Swamy SRK > Subject: [spring] PSP and USP uN Flavors Folks, In draft-filsfils-spring-net-pgm-extension-srv6-usid, a uN represents an in= struction (END, END.T) instantiated on a node. Can that instruction have a = PSP or USP flavor? [PC] The uN behavior is a new behavior. This behavior is defined in https:/= /tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-07#s= ection-4.1.1 The uN behavior may be combined with the PSP, USP or USD flavors. Same appl= ies to the uA behavior. You have the full list of behaviors in Section 9 of the draft. If so, wouldn't the PSP/USP cause an SRH that has not yet been processed to= be deleted? [PC] No. Leveraging the terminology defined in Section 2 of the draft: the = PSP/USP/USD is only executed when you get to the Last uSID of the uSID Cont= ainer. Please have a look at the uN pseudocode in the latest revision of the draft= (rev 7). I believe the pseudocode is clearer than in previous revisions. Thanks, and let me know if unclear. - Karthik Non-Juniper --_000_DM6PR05MB6348C91C3934A9B935CB68BEAE240DM6PR05MB6348namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Pablo,

 

Assume the following packet:

 

  • Destination address is a uSID container
  • Next hea= der is an SRH

 

In this case, you wouldn’t process the SRH unt= il you process every uSID in the uSID container. Do I have this much right?=

 

So, if any uSID in the container specified the PSP o= r USP flavor, you would delete an SRH that has not yet been processed.=

 

Do I have this right?

 

        &nbs= p;            &= nbsp;           &nbs= p;             =     Ron

 

 

 

Non-Juniper

From: spring <spring-bounces@ietf.org> = On Behalf Of Pablo Camarillo (pcamaril)
Sent: Wednesday, September 9, 2020 4:13 AM
To: G. Sri Karthik Goud <gkarthik=3D40juniper.net@dmarc.ietf.org&= gt;; spring@ietf.org
Cc: Swamy SRK <swamys@juniper.net>
Subject: Re: [spring] PSP and USP uN Flavors

 

<= span lang=3D"ES" style=3D"font-size:10.5pt;font-family:"Lato",san= s-serif;color:black">[External Email. Be cautious of content]

 

Hi Karthik,

 

Please see inline.

 

Cheers,

Pablo.

 

From: spring <spring-bounces@ietf.org> On Behalf Of G. Sri Karthik Goud
Sent: mi=E9rcoles, 26 de agosto de 2020 0:30
To: spring@ietf.org
Cc: Swamy SRK <swamys@junip= er.net>
Subject: [spring] PSP and USP uN Flavors

 

Folks,

 

In draft-filsfils-spring-net-pgm-extension-srv6-usid= , a uN represents an instruction (END, END.T) instantiated on a node. Can t= hat instruction have a PSP or USP flavor?

[PC] The uN behavior is a new behavior. This b= ehavior is defined in https://tools.ietf.org/html/draft-f= ilsfils-spring-net-pgm-extension-srv6-usid-07#section-4.1.1

The uN behavior may be combined with the PSP, = USP or USD flavors. Same applies to the uA behavior.

You have the full list of behaviors in Section= 9 of the draft.

 

If so, wouldn’t the PSP/USP cause an SRH that = has not yet been processed to be deleted?

[PC] No. Leveraging the terminology defined in= Section 2 of the draft: the PSP/USP/USD is only executed when you get to t= he Last uSID of the uSID Container.

Please have a look at the uN pseudocode in the= latest revision of the draft (rev 7). I believe the pseudocode is clearer = than in previous revisions.

Thanks, and let me know if unclear.

 

- Karthik

 

 

Non-Juniper

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Sri Karthik Goud" , "spring@ietf.org" CC: Swamy SRK Thread-Topic: PSP and USP uN Flavors Thread-Index: AdZ7Lz2AA+mT+DNyR32P99LVzfPpMQLS/vqQAHUh4sAAGB5SwA== Date: Sat, 12 Sep 2020 02:59:28 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Enabled=true; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SetDate=2020-08-25T22:29:34Z; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Method=Privileged; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_Name=106ee314-308e-4f40-a474-5b984ee7b7ff; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ActionId=98a14009-1467-4322-8d0e-f3eb7ac60356; MSIP_Label_106ee314-308e-4f40-a474-5b984ee7b7ff_ContentBits=2 dlp-product: dlpe-windows dlp-version: 11.5.0.60 dlp-reaction: no-action authentication-results: dmarc.ietf.org; dkim=none (message not signed) header.d=none; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable In this case, you wouldn't process the SRH until you process every uSID in = the uSID container. Do I have this much right? Perfect So, if any uSID in the container specified the PSP or USP flavor, you would= delete an SRH that has not yet been processed. PSP or USP wont come into picture untill DA.Argument is equal to zero.Hope = this clarifies. 1. If (DA.Argument !=3D 0) { 2. Copy DA.Argument into the bits [B..(B+A-1)] of the Destination Address of the IPv6 header. 3. Set the bits [(B+A)..(B+NF+A-1)] of the Destination Address of the IPv6 header to zero. 4. } Else { 5. Decrement Segments Left by 1. 6. Copy Segment List[Segments Left] from the SRH to the Destination Address of the IPv6 header. 7. } Thanks Rajesh Non-Juniper From: spring On Behalf Of Ron Bonica Sent: Friday, September 11, 2020 9:01 PM To: Pablo Camarillo (pcamaril) ; G. = Sri Karthik Goud ; spring@ietf.org Cc: Swamy SRK Subject: Re: [spring] PSP and USP uN Flavors [External Email. Be cautious of content] Pablo, Assume the following packet: * Destination address is a uSID container * Next header is an SRH In this case, you wouldn't process the SRH until you process every uSID in = the uSID container. Do I have this much right? So, if any uSID in the container specified the PSP or USP flavor, you would= delete an SRH that has not yet been processed. Do I have this right? Ron Non-Juniper From: spring > On B= ehalf Of Pablo Camarillo (pcamaril) Sent: Wednesday, September 9, 2020 4:13 AM To: G. Sri Karthik Goud >; spring@ietf.org Cc: Swamy SRK > Subject: Re: [spring] PSP and USP uN Flavors [External Email. Be cautious of content] Hi Karthik, Please see inline. Cheers, Pablo. From: spring > On B= ehalf Of G. Sri Karthik Goud Sent: mi=E9rcoles, 26 de agosto de 2020 0:30 To: spring@ietf.org Cc: Swamy SRK > Subject: [spring] PSP and USP uN Flavors Folks, In draft-filsfils-spring-net-pgm-extension-srv6-usid, a uN represents an in= struction (END, END.T) instantiated on a node. Can that instruction have a = PSP or USP flavor? [PC] The uN behavior is a new behavior. This behavior is defined in https:/= /tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-07#s= ection-4.1.1 The uN behavior may be combined with the PSP, USP or USD flavors. Same appl= ies to the uA behavior. You have the full list of behaviors in Section 9 of the draft. If so, wouldn't the PSP/USP cause an SRH that has not yet been processed to= be deleted? [PC] No. Leveraging the terminology defined in Section 2 of the draft: the = PSP/USP/USD is only executed when you get to the Last uSID of the uSID Cont= ainer. Please have a look at the uN pseudocode in the latest revision of the draft= (rev 7). I believe the pseudocode is clearer than in previous revisions. Thanks, and let me know if unclear. - Karthik Non-Juniper --_000_MN2PR05MB6080F978F7A47606F69C4A29BE250MN2PR05MB6080namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

In this case, you wouldn’t process the SRH unt= il you process every uSID in the uSID container. Do I have this much right?=

 

Perfect

 

So, if any uSID in the container specified the PSP o= r USP flavor, you would delete an SRH that has not yet been processed.=

PSP or USP wont come in= to picture untill DA.Argument is equal to zero.Hope this clarifies.

 

1. If (DA.Argument !=3D 0) {

2. Copy DA.Argument into the bits [B..(B+A-1= )] of the

Destination Address of the IPv6 header.=

3. Set the bits [(B+A)..(B+NF+A-1)] of the D= estination Address

of the IPv6 header to zero.

4. } Else {

5. Decrement Segments Left by 1.<= /span>

6. Copy Segment List[Segments Left] from the= SRH to the

Destination Address of the IPv6 header.=

7. }

 

 

 

Thanks

Rajesh

 

 

 

Non-Juniper

From: spring <spring-bounces@ietf.org> = On Behalf Of Ron Bonica
Sent: Friday, September 11, 2020 9:01 PM
To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf= .org>; G. Sri Karthik Goud <gkarthik=3D40juniper.net@dmarc.ietf.org&g= t;; spring@ietf.org
Cc: Swamy SRK <swamys@juniper.net>
Subject: Re: [spring] PSP and USP uN Flavors

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Pablo,

 

Assume the following packet:

 

  • Destination address is a uSID container
  • Next hea= der is an SRH

 

In this case, you wouldn’t process the SRH unt= il you process every uSID in the uSID container. Do I have this much right?=

 

So, if any uSID in the container specified the PSP o= r USP flavor, you would delete an SRH that has not yet been processed.=

 

Do I have this right?

 

        &nbs= p;            &= nbsp;           &nbs= p;             =     Ron

 

 

 

Non-Juniper

From: spring <spring-bounces@ietf.org> On Behalf Of Pablo Camarillo (pcamaril)
Sent: Wednesday, September 9, 2020 4:13 AM
To: G. Sri Karthik Goud <gkarthik=3D40juniper.net@dmarc.ietf.org>; spring@ietf.org
Cc: Swamy SRK <swamys@junip= er.net>
Subject: Re: [spring] PSP and USP uN Flavors

 

<= span lang=3D"ES" style=3D"font-size:10.5pt;font-family:"Lato",san= s-serif;color:black">[External Email. Be cautious of content]

 

Hi Karthik,

 

Please see inline.

 

Cheers,

Pablo.

 

From: spring <spring-bounces@ietf.org> On Behalf Of G. Sri Karthik Goud
Sent: mi=E9rcoles, 26 de agosto de 2020 0:30
To: spring@ietf.org
Cc: Swamy SRK <swamys@junip= er.net>
Subject: [spring] PSP and USP uN Flavors

 

Folks,

 

In draft-filsfils-spring-net-pgm-extension-srv6-usid= , a uN represents an instruction (END, END.T) instantiated on a node. Can t= hat instruction have a PSP or USP flavor?

[PC] The uN behavior is a new behavior. This b= ehavior is defined in https://tools.ietf.org/html/draft-f= ilsfils-spring-net-pgm-extension-srv6-usid-07#section-4.1.1

The uN behavior may be combined with the PSP, = USP or USD flavors. Same applies to the uA behavior.

You have the full list of behaviors in Section= 9 of the draft.

 

If so, wouldn’t the PSP/USP cause an SRH that = has not yet been processed to be deleted?

[PC] No. Leveraging the terminology defined in= Section 2 of the draft: the PSP/USP/USD is only executed when you get to t= he Last uSID of the uSID Container.

Please have a look at the uN pseudocode in the= latest revision of the draft (rev 7). I believe the pseudocode is clearer = than in previous revisions.

Thanks, and let me know if unclear.

 

- Karthik

 

 

Non-Juniper

--_000_MN2PR05MB6080F978F7A47606F69C4A29BE250MN2PR05MB6080namp_-- From nobody Fri Sep 11 23:28:16 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 806C33A0DCE for ; Fri, 11 Sep 2020 23:28:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tpltbusLph2d for ; Fri, 11 Sep 2020 23:28:12 -0700 (PDT) Received: from mail-ua1-x92b.google.com (mail-ua1-x92b.google.com [IPv6:2607:f8b0:4864:20::92b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E3DA03A0DCF for ; Fri, 11 Sep 2020 23:28:11 -0700 (PDT) Received: by mail-ua1-x92b.google.com with SMTP id u14so3805434uaq.1 for ; Fri, 11 Sep 2020 23:28:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YXi3ZgeV5y8aWttpCCfawTLHIqVtvB87lC9YmH4fi8s=; b=ZvfI3emh+jECes9qFZvQZt7uN3YxCE2qggO38OUZE5p9iqqPIRzVFoFMYH6iizg4wC jwfc3m3UOnSeWxmInrMdP+dMmI5q1d0LS7bDQiYQyR6F7EhKY2L6nbTrMezEgK/9/e+Q kIGaRzMWQRZXFmuP4csA/IhFsm1sh9fnXiqRwAHO0yusX54BPrapQWGcsnSiyv2lXMbx +IL3h3s0YulcJkMCgCsiiKzbwM/bMRm6MPvHcsXQVbOgw2KVVskY9tkyUJ1bdyRWVp9+ vKXhbmaE731B0YYt61rXf6H2ibcerrhEsuFPs/ERCJuZx4l6klMCCZlmZi7QE98cYYKG 2p5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YXi3ZgeV5y8aWttpCCfawTLHIqVtvB87lC9YmH4fi8s=; b=NQ8cI463tVoNnvsV3pjvhNttk8HMYIm5cyrVG/YSfEwCFHnksenHKaYrplilw3zi+0 kX0Nzy7CoTddy0+UaTiEmotBj3LzGn/O7a3sz1390Gt3/7Qi8BECWc7sTn9JPxthfkBl PeQTKFuJ7C520saE7nW5bOJQ6FueHc10Z9Jb53C3L8rsTrJMZcMJkkKz0CNI9he8/I8g WMoa4Duq9IcKlqaolfAuE3qyu6KS8ZWlVRqf+Y0uiWlXUPTQREnGPAvqAAs+6oQcumHw j+i1/qWswPW1eXrrwlCVtFalbxQddsF2MLuzYfRiGt4J9El27so0fsKqY9r7qpPccJ+O nHVA== X-Gm-Message-State: AOAM533fFRfeuwzbGcSmTNJ+6JST6qNx7UdH20okPe9rXhR3Lmd7DN5n eCt8J4wUKAzvcalegB56OBwCAvV9UP22ZcPxBMM= X-Google-Smtp-Source: ABdhPJyOn2hBd6f9NSMb1pr8WeOwtQxD1LJHPT2dm91FqIQvvNwTFcopOBGLXz7iN76BvP6GCm0LZdHuTeuC40qzANs= X-Received: by 2002:ab0:3885:: with SMTP id z5mr2896710uav.114.1599892090868; Fri, 11 Sep 2020 23:28:10 -0700 (PDT) MIME-Version: 1.0 References: <22402_1599234564_5F526204_22402_314_1_53C29892C857584299CBF5D05346208A48F58F00@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <799904D5-864B-4D86-958F-4588F64F464A@gmail.com> In-Reply-To: <799904D5-864B-4D86-958F-4588F64F464A@gmail.com> From: Gyan Mishra Date: Sat, 12 Sep 2020 02:28:00 -0400 Message-ID: To: Jeff Tantsura Cc: Martin Horneffer , bruno.decraene@orange.com, "spring@ietf.org" Content-Type: multipart/alternative; boundary="000000000000c1566b05af17e758" Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 12 Sep 2020 06:28:15 -0000 --000000000000c1566b05af17e758 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Jeff I am in agreement that drop should be the default behavior in this case where ldp is broken and unable to forward due to unlabeled fec. As of the last many years most vendors and best practice of any MPLS implementations is to have knobs to change the default behavior. That being said you won=E2=80=99t encounter the default unlabeled drop behavior now as operators had early on with MPLS 20+ years ago. With the maturity of any technology comes with hard knocks and learning curves that in order for MPLS to work without customer impact you have to implement these knobs. Kind Regards Gyan On Wed, Sep 9, 2020 at 4:38 AM Jeff Tantsura wrote: > I=E2=80=99m with Bruno here, and the spec is quite clear on the behavior = expected > (implementors, please speak up). > > Given variability and interdependencies in use cases, I=E2=80=99d say, dr= op should > be (and de-jure it is) the default behavior, and if someone wants their > vendor of choice to implement a knob to change that - they are free to do > so (local behavior) as long as consequences are well understood (rope is > short). > > > > Cheers, > > Jeff > > > > > On Sep 4, 2020, at 17:49, bruno.decraene@orange.com wrote: > > > > > > =EF=BB=BFHi Martin, > > > > > >> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin > > >> Horneffer > > >> > > >> Hello everyone, > > >> > > >> may I come back the the question below? Or rather let me update it a > little: > > >> > > >> In case an SR-MPLS path is broken, should a node rather drop the packe= t, > > >> or forward it? > > >> > > >> This can happen whenever the IGP points to a certain next hop, but tha= t > > >> neither supplies a valid SID, nor allows LDP-stitching for whatever > > >> reason. For PUSH as well as for CONTINUE. > > > > > > Speaking as an individual contributor, my reading of RFC 8660 (SR-MPLS) > is that the packet is dropped ("Otherwise, drop the packet"). > > > > https://www.rfc-editor.org/rfc/rfc8660.html#name-forwarding-for-push-and-= con > > > > > > However that could be seen as a local behavior, hence possibly > configurable. > > > > > > As a network operator, > > > - I understand your use case. > > > - I equally understand the use case of someone preferring/requiring the > packet to be dropped, e.g. in the VPN case where the isolation is the mai= n > requirement. > > > > > > Best regards, > > > --Bruno > > > > > > > > >> We have been using MPLS transport and a BGP free core since about two > > >> decades now, using LDP. In the analog case, LDP creates "unlabelled" > > >> entries in the LFIB, does the equivalent of a POP operation and forwar= ds > > >> the packet to the next-hop as chosen by the IGP. > > >> > > >> This behavior obviously breaks any traffic that relies on a service > > >> label, but it can protect some traffic. > > >> In our case a huge percentage of all traffic still is public IPv4. Thi= s > > >> needs MPLS only for a transport label, be it LDP or SR-MPLS. If this > > >> traffic gets forwarded unlabelled, it follows an IGP default route to = a > > >> central device, where it is 1) redirected to the correct destination a= nd > > >> 2) counted in a way that operators can quickly see whether and where > > >> this kind of failure occurs at some point in the network. > > >> > > >> After more operational experience and several internal discussions we > > >> agreed that we want packets to be forwarded unlabelled rather than > > >> dropped. Anyone to share, or oppose this position? > > >> > > >> Best regards, Martin > > >> > > >> > > >>> Am 31.01.20 um 16:50 schrieb Martin Horneffer: > > >>> Hello everyone, > > >>> > > >>> again it seems the interesting questions only show up when applying > > >>> something to the live network... > > >>> > > >>> We ran into something that poses a question related to RFC8660: What > > >>> is the exact meaning of section 2.10.1, "Forwarding for PUSH and > > >>> CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a > > >>> valid MPLS path? > > >>> > > >>> The relevant sections reads: > > >>> > > >>> - Else, if there are other usable next hops, use them to forwa= rd > > >>> the incoming packet. The method by which the router "R0" > > >>> decides on the possibility of using other next hops is beyon= d > > >>> the scope of this document. For example, the MCC on "R0" ma= y > > >>> chose the send an IPv4 packet without pushing any label to > > >>> another next hop. > > >>> > > >>> Does the part "send an IPv4 packet without pushing any label" apply t= o > > >>> PUSH and CONTINUE, or just to PUSH? > > >>> Does R0 have to validate that neighbor N can correctly process to > > >>> packet? Or can it forward the packet regardless? > > >>> > > >>> The reason for asking is that we are now seeing issues similar to one= s > > >>> we had when starting with LDP based MPLS about two decades ago: > > >>> traffic being black holed even though a path to the destination > > >>> exists, because the MPLS path is interrupted somewhere in the middle. > > >>> > > >>> With LDP we know the case of LFIBentries called "unlabelled". While > > >>> this does break connectivity for many kinds of service, e.g. those > > >>> relying on an additional service labels, it still works for plain > > >>> IP(v4) traffic. In our cases, this works perfectly fine for all > > >>> internal routing and control traffic. And even for IPv4 traffic that > > >>> gets collected by a central router that injects a default route. > > >>> > > >>> However, depending on the exact interpretation of the above paragraph= , > > >>> an implementor might feel obliged to chose the next paragraph: > > >>> > > >>> - Otherwise, drop the packet. > > >>> > > >>> Which is, at least in our case, very unfortunate... > > >>> > > >>> Any advice or opinion appreciated! > > >>> > > >>> > > >>> Best regards, Martin > > >>> > > >>> > > >>> > > >>> > > >>> _______________________________________________ > > >>> spring mailing list > > >>> spring@ietf.org > > >>> https://www.ietf.org/mailman/listinfo/spring > > >> > > >> _______________________________________________ > > >> spring mailing list > > >> spring@ietf.org > > >> https://www.ietf.org/mailman/listinfo/spring > > > > > > > _________________________________________________________________________= ________________________________________________ > > > > > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez > recu ce message par erreur, veuillez le signaler > > > a l'expediteur et le detruire ainsi que les pieces jointes. Les message= s > electroniques etant susceptibles d'alteration, > > > Orange decline toute responsabilite si ce message a ete altere, deforme > ou falsifie. Merci. > > > > > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > > > they should not be distributed, used or copied without authorisation. > > > If you have received this email in error, please notify the sender and > delete this message and its attachments. > > > As emails may be altered, Orange is not liable for messages that have > been modified, changed or falsified. > > > Thank you. > > > > > > _______________________________________________ > > > spring mailing list > > > spring@ietf.org > > > https://www.ietf.org/mailman/listinfo/spring > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000c1566b05af17e758 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Jeff

I= am in agreement that drop should be the default behavior in this case wher= e ldp is broken and unable to forward due to unlabeled fec.

As of the last many years most vendor= s and best practice of any MPLS implementations is to have knobs to change = the default behavior.=C2=A0 That being said you won=E2=80=99t encounter the= default unlabeled drop=C2=A0
behavior now as operat= ors had early on with MPLS 20+ years ago.=C2=A0 With the maturity of any te= chnology comes with hard knocks and learning curves that in order for MPLS = to work without customer impact you have to implement these knobs.

Kind Regards

Gyan

On Wed, Sep 9, 2020 at 4:38 AM Jef= f Tantsura <jefftant.ietf@gma= il.com> wrote:
I=E2=80=99m w= ith Bruno here, and the spec is quite clear on the behavior expected (imple= mentors, please speak up).

Given variability and interdependencies i= n use cases, I=E2=80=99d say, drop should be (and de-jure it is) the defaul= t behavior, and if someone wants their vendor of choice to implement a knob= to change that - they are free to do so (local behavior) as long as conseq= uences are well understood (rope is short).



Cheers,

J= eff



> On Sep 4, 2020, at 17:49, bruno.decraene@orange.com wrote:<= br>
>

> =EF=BB=BFHi Martin,

>

>> F= rom: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin

>> Horn= effer

>>

>> Hello everyone,

>>
=
>> may I come back the the question below? Or rather let me updat= e it a little:

>>

>> In case an SR-MPLS path is = broken, should a node rather drop the packet,

>> or forward it= ?

>>

>> This can happen whenever the IGP points = to a certain next hop, but that

>> neither supplies a valid SI= D, nor allows LDP-stitching for whatever

>> reason. For PUSH a= s well as for CONTINUE.

>

> Speaking as an individual = contributor, my reading of RFC 8660 (SR-MPLS) is that the packet is dropped= ("Otherwise, drop the packet").

> https://www.rfc-editor.org/rfc/rfc8660.html#= name-forwarding-for-push-and-con

>

> However that = could be seen as a local behavior, hence possibly configurable.

>=

> As a network operator,

> - I understand your use c= ase.

> - I equally understand the use case of someone preferring/= requiring the packet to be dropped, e.g. in the VPN case where the isolatio= n is the main requirement.

>

> Best regards,

&g= t; --Bruno

>

>

>> We have been using MPL= S transport and a BGP free core since about two

>> decades now= , using LDP. In the analog case, LDP creates "unlabelled"

= >> entries in the LFIB, does the equivalent of a POP operation and fo= rwards

>> the packet to the next-hop as chosen by the IGP.
=
>>

>> This behavior obviously breaks any traffic th= at relies on a service

>> label, but it can protect some traff= ic.

>> In our case a huge percentage of all traffic still is p= ublic IPv4. This

>> needs MPLS only for a transport label, be = it LDP or SR-MPLS. If this

>> traffic gets forwarded unlabelle= d, it follows an IGP default route to a

>> central device, whe= re it is 1) redirected to the correct destination and

>> 2) co= unted in a way that operators can quickly see whether and where

>= > this kind of failure occurs at some point in the network.

>&= gt;

>> After more operational experience and several internal= discussions we

>> agreed that we want packets to be forwarded= unlabelled rather than

>> dropped. Anyone to share, or oppose= this position?

>>

>> Best regards, Martin
>>

>>

>>> Am 31.01.20 um 16:50 schri= eb Martin Horneffer:

>>> Hello everyone,

>>>= ;

>>> again it seems the interesting questions only show u= p when applying

>>> something to the live network...
>>>

>>> We ran into something that poses a quest= ion related to RFC8660: What

>>> is the exact meaning of se= ction 2.10.1, "Forwarding for PUSH and

>>> CONTINUE of= Global SIDs", when the chosen neighbor doesn't provide a

&= gt;>> valid MPLS path?

>>>

>>> The r= elevant sections reads:

>>>

>>>=C2=A0 =C2= =A0 =C2=A0 =C2=A0-=C2=A0 Else, if there are other usable next hops, use the= m to forward

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the inco= ming packet.=C2=A0 The method by which the router "R0"

>= ;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 decides on the possibility of u= sing other next hops is beyond

>>>=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 the scope of this document.=C2=A0 For example, the MCC on "= R0" may

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 chose th= e send an IPv4 packet without pushing any label to

>>>=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 another next hop.

>>>
<= br>>>> Does the part "send an IPv4 packet without pushing any= label" apply to

>>> PUSH and CONTINUE, or just to PUS= H?

>>> Does R0 have to validate that neighbor N can correct= ly process to

>>> packet? Or can it forward the packet rega= rdless?

>>>

>>> The reason for asking is t= hat we are now seeing issues similar to ones

>>> we had whe= n starting with LDP based MPLS about two decades ago:

>>> t= raffic being black holed even though a path to the destination

>&= gt;> exists, because the MPLS path is interrupted somewhere in the middl= e.

>>>

>>> With LDP we know the case of LF= IBentries called "unlabelled". While

>>> this doe= s break connectivity for many kinds of service, e.g. those

>>&= gt; relying on an additional service labels, it still works for plain
>>> IP(v4) traffic. In our cases, this works perfectly fine for = all

>>> internal routing and control traffic. And even for = IPv4 traffic that

>>> gets collected by a central router th= at injects a default route.

>>>

>>> Howeve= r, depending on the exact interpretation of the above paragraph,

>= ;>> an implementor might feel obliged to chose the next paragraph:
>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0-=C2=A0 Ot= herwise, drop the packet.

>>>

>>> Which is= , at least in our case, very unfortunate...

>>>

>= ;>> Any advice or opinion appreciated!

>>>

&g= t;>>

>>> Best regards, Martin

>>>
>>>

>>>

>>>

>&g= t;> _______________________________________________

>>> = spring mailing list

>>> spring@ietf.org

>>> https://www.ietf.org/mailman/listinfo/spring

>>

= >> _______________________________________________

>> sp= ring mailing list

>> spring@ietf.org

>> https://= www.ietf.org/mailman/listinfo/spring

>

> _________= ___________________________________________________________________________= _____________________________________

>

> Ce message e= t ses pieces jointes peuvent contenir des informations confidentielles ou p= rivilegiees et ne doivent donc

> pas etre diffuses, exploites ou = copies sans autorisation. Si vous avez recu ce message par erreur, veuillez= le signaler

> a l'expediteur et le detruire ainsi que les pi= eces jointes. Les messages electroniques etant susceptibles d'alteratio= n,

> Orange decline toute responsabilite si ce message a ete alte= re, deforme ou falsifie. Merci.

>

> This message and i= ts attachments may contain confidential or privileged information that may = be protected by law;

> they should not be distributed, used or co= pied without authorisation.

> If you have received this email in = error, please notify the sender and delete this message and its attachments= .

> As emails may be altered, Orange is not liable for messages t= hat have been modified, changed or falsified.

> Thank you.
>

> _______________________________________________

&= gt; spring mailing list

> spring@ietf.org

> https://ww= w.ietf.org/mailman/listinfo/spring



_____________________= __________________________

spring mailing list

spring@ietf.org

https://www.ietf.org/mailman/listinfo/spring

--

Gyan Mishra

=

Network Solutions A<= /i>rchitect=C2=A0=

M 301 502-1347
13101 Columbia Pi= ke=C2=A0
Silver Spring, MD


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Sri Karthik Goud" , Deepti Rathi , SPRING WG Thread-Topic: SRV6 OAM (USP SID) Thread-Index: AdaKemmq5NpsAtGzTPS1g8PV0XHmqw== Date: Mon, 14 Sep 2020 09:36:07 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.5.0.60 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-09-14T09:36:04Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=1c72c92f-eaef-4ef8-8e8a-5febfe22a91d; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=2 authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=juniper.net; x-originating-ip: [116.197.184.14] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 2d86d76f-10f1-4eb7-09c0-08d858919b63 x-ms-traffictypediagnostic: MN2PR05MB5967: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 4dNfj3ced6RKq+TTyYcC2L90gcK4DVCJ0H8haLnxOi8zeQGKIUGEaqKxtj42QUhcTo6KLEZNlsVPwQ4cyB5Y7yhOB1mu+Qw19MiNfjHnhITe45uJGYUg2p19F9iW3VBKImEUzRMNBFc3mQ32g4gCqmzoqrSvs0TRHhf7wTVb9MTFLNhRRHIYHkcDqwpGrW0PrD+0B+7feWzd+L1aqV1FUmRLdSn+GCOMFma/IOrVVnJZV9l8SsUmBhWpAv+Ky58qxr5aXPy8HJryOKxpQMzFvDCZ9Bo0CyT9V3HPm+0qCoM5G7K0r3Mkvo05+aJ70XjSnRYc9HOFYOG6X94T+ThmfNNUfQ3XqMiLda7WjSOm7qYLqvg1YmOCQpWP2KQ949q2OJLzj8a7AF5MlBqLIYVCBTqXGA2g7wiaNEIA0k/ReauXZ1gMqP/wCjaGunMMYiH81BU+nBk35REC24SQNICkWg== x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR05MB6080.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(136003)(39860400002)(366004)(396003)(376002)(346002)(33656002)(55016002)(4326008)(110136005)(5660300002)(76116006)(66446008)(64756008)(66556008)(66476007)(66946007)(9686003)(52536014)(2906002)(186003)(6506007)(26005)(4744005)(71200400001)(54906003)(7696005)(316002)(478600001)(86362001)(83380400001)(8676002)(8936002)(166002); DIR:OUT; SFP:1102; x-ms-exchange-antispam-messagedata: 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 Content-Type: multipart/alternative; boundary="_000_MN2PR05MB6080FC495B9315D5C2023C6ABE230MN2PR05MB6080namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB6080.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2d86d76f-10f1-4eb7-09c0-08d858919b63 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Sep 2020 09:36:07.2446 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qhZDqKPAq40MHcTWj+mTXohhbw+CA1lHe/xjXPhZ3wl+WJvIjEAGoO6OWo+nveIspAm0IMVlff/fd58m5Sw9IA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB5967 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-14_02:2020-09-10, 2020-09-14 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 impostorscore=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 mlxlogscore=544 mlxscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009140079 Archived-At: Subject: [spring] SRV6 OAM (USP SID) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 09:36:12 -0000 --_000_MN2PR05MB6080FC495B9315D5C2023C6ABE230MN2PR05MB6080namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable When ingress pings a USP SID, at the egress below code is executed. 4.16.2. USP: Ultimate Segment Pop of the SRH The SRH processing of the End, End.X and End.T behaviors are modified: the instructions S02-S04 are substituted by the following ones: S02. If (Segments Left =3D=3D 0) { S03.1. Update the Next Header field in the preceding header to the Next Header value of the SRH S03.2. Decrease the IPv6 header Payload Length by the Hdr Ext Len value of the SRH S03.3. Remove the SRH from the IPv6 extension header chain S03.4. Proceed to process the next header in the packet S04. } May be we should explicitly state here "if next header is Upper layer heade= r then execute section 4.1.1" Juniper Business Use Only --_000_MN2PR05MB6080FC495B9315D5C2023C6ABE230MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

When ingress pings a USP SID, at the egress below co= de is executed.

 

4.16.2.  USP: Ultimate Segment Pop of the SRH

 
   The SRH processing of the End, End.X and End.T behaviors =
are
   modified: the instructions S02-S04 are substituted by the=
 following
   ones:
 
 S02.     If (Segments Left =3D=3D 0) {=

 S03.1.      Upd=
ate the Next Header field in the preceding header to the<=
/b>
       &nbs=
p;        Next Header value of the =
SRH
 S03.2.      Decrease the IPv6 header Payload=
 Length by the Hdr Ext Len
           &nbs=
p;    value of the SRH
 S03.3.      Remove the SRH from the IPv6 ext=
ension header chain
 S03.4.      Pro=
ceed to process the next header in the packet
 S04.     }

 

 

May be we should explic= itly state here “if next header is Upper layer header then execute se= ction 4.1.1”

 


Juniper Business= Use Only

--_000_MN2PR05MB6080FC495B9315D5C2023C6ABE230MN2PR05MB6080namp_-- From nobody Mon Sep 14 02:40:50 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A61573A0D7D; Mon, 14 Sep 2020 02:40:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.017 X-Spam-Level: X-Spam-Status: No, score=-2.017 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sCrTpBUz6LX6; Mon, 14 Sep 2020 02:40:46 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 354263A0D85; Mon, 14 Sep 2020 02:40:45 -0700 (PDT) Received: from opfednr04.francetelecom.fr (unknown [xx.xx.xx.68]) by opfednr26.francetelecom.fr (ESMTP service) with ESMTP id 4BqhDp5CmYz10ZT; Mon, 14 Sep 2020 11:40:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1600076442; bh=oG+Irs+1unbWyHNTheJ+KUq1bJ+49J3RDZzt61SFqI8=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=S2d24VaVJPN2EEbA7jPD5GMCQ3EpTgJKIG9GT7UeGARJkeOflJlrdNzE5U+1QDuq8 01ub6FouTZ3RlKmrCMGaBsx3X+tNYLladK3w9Co11/s2DoQVaAtFtgJSHZM0elJBxj c+eW7Pl4eSbXbiTmr0i4WV2RteP/+mVsVifpgZkh8leBk9ycD6p/t2jC8irR6x1M2b O/TP6t3xVezn/3rRj1FuW4xSAeSeqsVOanPFmD8yu2nWUfaPArY7x9VMJACRdaSAtv 2svw8/C51te9GIHX5dl1Tsunm7XFDT4G7Dp2vP4+Ohwus//57u5jl9anziBSihIZSA hE63daOtrXc2w== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.64]) by opfednr04.francetelecom.fr (ESMTP service) with ESMTP id 4BqhDp3qNBz1xpM; Mon, 14 Sep 2020 11:40:42 +0200 (CEST) From: To: Shraddha Hegde , "draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org" CC: "spring@ietf.org" Thread-Topic: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths Thread-Index: AdZmaxBja895PvK+QsirQTKFBBYlewgMNufgAFqWvsAAm87RcA== Date: Mon, 14 Sep 2020 09:40:41 +0000 Message-ID: <9393_1600076442_5F5F3A9A_9393_23_1_53C29892C857584299CBF5D05346208A48F6BF21@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <3815_1596111875_5F22BC03_3815_57_2_53C29892C857584299CBF5D05346208A48F028F5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <28149_1599664617_5F58F1E9_28149_171_1_53C29892C857584299CBF5D05346208A48F644A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48F6BF21OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [spring] WG adoption call for draft-hegde-spring-node-protection-for-sr-te-paths X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 09:40:49 -0000 --_000_53C29892C857584299CBF5D05346208A48F6BF21OPEXCAUBM43corp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Shraddha, Thanks for your reply. Please see inline [Bruno] [/Bruno] From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Shraddha Hegde Sent: Friday, September 11, 2020 1:43 PM To: DECRAENE Bruno TGI/OLN ; draft-hegde-spring-= node-protection-for-sr-te-paths@ietf.org Cc: spring@ietf.org Subject: Re: [spring] WG adoption call for draft-hegde-spring-node-protecti= on-for-sr-te-paths Hi Bruno, Thanks for the review and comments. Pls see inline for replies. Juniper Business Use Only From: bruno.decraene@orange.com > Sent: Wednesday, September 9, 2020 8:47 PM To: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Cc: spring@ietf.org Subject: RE: [spring] WG adoption call for draft-hegde-spring-node-protecti= on-for-sr-te-paths [External Email. Be cautious of content] Hi authors, all, As an individual contributor, I have two non-blocking comments. 1) I feel that the terminology "node protection" in the name of the d= raft could be misleading. "Node Protection" is already used in [LFA] and [RLFA]. It refers to a prope= rty of the alternate path avoiding the next node on the path to the egress/= destination. It does not change the destination/egress. It looks to me that the function been proposed in the draft is more along [= Egress Protection] which protects from the failure of the egress/destinatio= n, and hence do change the destination/egress. (full disclosure, I'm co-aut= hor of [Egress Protection] ) I think that both are different and that properties are different, hence us= ing the same name is misleading. In particular, in the first one, the destination/egress is unchanged and he= nce properties of the destination/egress is unchanged: no problem. While in= the second case, a node (a 'protector' in [Egress Protection]) is claiming= to provide a similar service, but possibly only a subset of the original s= ervices or without the stateful states). Cf some discussion on the mailing = list along "How do I know that I can safely pretend that I'm the original d= estination?" Personally I would propose to replace "Node Protection" by "Segment Protect= ion" or "Segment Egress Protection" or "IGP Segment Egress Protection" sinc= e the proposal seem restricted to IGP knowledge. I agree that using the term node protection is confusing. I thin= k that "segment protection" is the right term. [Bruno] works for me. Using egress keyword may cause other confusions because term egress is us= ed in egress protection RFCs to mean the egress nodes on which the services= reside. In this draft the focus is on nodes that are not egresses. [Bruno] Regarding the term "Egress", it looks to me that you're considering= the position of the ingress (PE) which is well aware of the distinction be= tween the service egress and the SR policy used to steer on a specific path= . From a P/PLR standpoint, I'd argue that the P is forwarding based on the = top label and for him, the destination for the label/FEC is the egress. Thi= s seem to match the definition from RFC 3031 In other words, we can speak of the level m LSP for Packet P as the sequence of routers: [...] 3. which ends (at an "LSP Egress") when a forwarding decision is made by label Switching on a level m-k label, where k>0 IOW, if there are N labels on a packet, there are N egresses. https://tools.ietf.org/html/rfc3031#section-3.15 Regarding [Egress Protection] I agree that in general, the text could be re= ad as only protecting a "service". However I believe that it covers the case of hierarchical transport LSPs: >From the abstract: "This document specifies a fast reroute framework for pr= otecting IP/MPLS services and MPLS transport tunnels against egress node an= d egress link failures." >From the introduction: "In MPLS networks, Label Switched Paths (LSPs) are w= idely used as transport tunnels to carry IP and MPLS services across MPLS d= omains. Examples of MPLS services are Layer 2 VPNs, Layer 3 VPNs, hierarchi= cal LSPs, and others." [/Bruno] [LFA] https://tools.ietf.org/html/rfc5286 [RLFA node protection] https://tools.ietf.org/html/rfc8102 [Egress Protection] https://tools.ietf.org/html/rfc8679 2) At best, the proposal ignores [Egress Protection]. At worst, the dr= aft breaks [Egress Protection] Both do not seem to co-operate. Actually, egress protection as defined in RFC 8679 works well wi= th procedures defined in this draft. Section 3.4 briefly talks about this. Initial versions of this draft had examples to describe how egress protecti= on works in conjunction with procedures described in this draft. Basically, egress protection described in RFC 8679 uses a context-id and co= ntext label. When the penultimate hop creates protection for the context-id= routes It follows the procedures described in RFC 8679 ( in conjunction with mirro= r-sid for SR networks). We also have a simplified version of RFC 8679 which= uses anycast SIDs and static service labels Described in draft-hegde-rtgwg-egress-protection-sr-network. This anycast b= ased egress protection also works well with protection procedures described= in this document. I'll add a section with examples to describe this which can help clarify. [Bruno] I did read section 3.4 but it just states that RFC 8679 "is applica= ble". May be adding a section with an example will help, thanks for this. In the meantime, my concern is that: - =A73.1 populates the contect label only with SR Prefix & Adjacen= cy SIDs - A priori, during the lookup in a MPLS (context) table, if no mat= ch is found, the packet is dropped. https://tools.ietf.org/html/rfc3031#sec= tion-3.18 Hence my conclusion that the proposition would drop the service packet rath= er than sending it to a protector node as per RFC 8679. [/Bruno] The draft applies the egress protection even though it can only protections= IGP segments/labels while [Egress Protection] would provide a much broader= protection, including service (e.g. VPNs) protection. Hence it seems to br= eak [Egress Protection] VPN service protection. No this draft does not break VPN service protection. I'll add de= tailed examples. I would propose that the draft refers a bit more to [Egress Protection], us= es its terminology if/when appropriate and then elaborate on the above issu= e. From a technical standpoint, I would propose to privilege the use of a (= complete) Protector (as per [Egress Protection] ) if available. This draft makes use of looking up the second label in the stack= for protection. It is different from protector based approach. [Bruno] IMHO, conceptually this draft combines both the PLR (first packet l= ookup) and Protector (second packet lookup) on the same node. That been said, RFC8679 is a large doc and relatively complex given the gen= eral scope that it is trying to achieve, hence making its reading mandatory= would probably add complexity for little benefit. Yet, since you have a se= ction dedicated on Egress Protection (=A73.4) may be a better description o= f how both document interact may be useful. Up to you. draft-hu-spring-segment-routing-proxy-forwarding Is more closer to protecto= r based approach I think. It comes with an overhead of configuring the primary and proxy pairs for set of nodes. Finally, as also raised by Zhibo, the scalability properties of the draft i= s not optimal, and in particular less optimal than [Egress Protection]. I'll add some more text on scalability. Section 5 of the draft p= roposes an optimisation to reduce scale. [Bruno] ok, thanks. [/Bruno] Indeed, most of the work/states is on a Protector node (having the context = mpls forwarding table). For a given failure, [Egress Protection] allows for= a single Protector while this drafts requires N Protectors (one per neighb= our). So more states in the network and on nodes. Also [Egress Protection] = allows to distribute this load while the draft requires the PLR to handle t= he protection for all its neighbhors. Since this draft restricts to IGP Segments, the scalability impact his limi= ted but still exist. (on the pro side, the draft avoids the additional transport cost/delay requ= ired to reach the Protector (since PLR and Protector are co-located)/ Fair point. I would see the advantage of this draft is more from= operational perspective since it does not require primary protector config= s. Enabling the feature with one single knob on the router will be good enough. [Bruno] In addition, this draft is better in term of incremental deployment= with incremental benefit as you have an incremental benefit with the first= new node. In some cases, it could be seen a providing a better delay/jitter as it doe= s not add the extra path up to the protector. (but this is very deployment = specific) Thanks, --Bruno [/Bruno] Regards, Bruno From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o= range.com Sent: Thursday, July 30, 2020 2:25 PM To: spring@ietf.org Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org Subject: [spring] WG adoption call for draft-hegde-spring-node-protection-f= or-sr-te-paths Hi SPRING WG, Authors of draft-hegde-spring-node-protection-for-sr-te-paths [1] have ask= ed for WG adoption. Please indicate your support, comments, or objection, for adopting this dra= ft as a working group item by August 20th 2020. (*) Could those who are willing to work on this document, please notify the lis= t. That gives us an indication of the energy level in the working group to = work on this. Thanks, Regards, Bruno, Jim, Joel [1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-t= e-paths-07 (*) 3 weeks to account for the IETF meeting week and the august/summer peri= od. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48F6BF21OPEXCAUBM43corp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Shraddha,

 

Thanks for your reply.

Please see inline [Bruno]  [/Bruno]

 

From: spring [mailto:spring-bounces@ietf.org] On= Behalf Of Shraddha Hegde
Sent: Friday, September 11, 2020 1:43 PM
To: DECRAENE Bruno TGI/OLN <bruno.decraene@orange.com>; draft-= hegde-spring-node-protection-for-sr-te-paths@ietf.org
Cc: spring@ietf.org
Subject: Re: [spring] WG adoption call for draft-hegde-spring-node-p= rotection-for-sr-te-paths

 

Hi Bruno,

 

Thanks for the review and comments.

Pls see inline for replies.

 

 

Juniper Business Use Only

 

<= span style=3D"font-size:10.5pt;font-family:Lato;color:black">[External Emai= l. Be cautious of content]

 

Hi authors, all,

 

As an individual contributor, I have two non-blocking comm= ents.

 

1)  &n= bsp;    

“Node Protection” is already used in [LFA] and= [RLFA]. It refers to a property of the alternate path avoiding the next no= de on the path to the egress/destination. It does not change the destination/egress.

It looks to me that the function been proposed in the draf= t is more along [Egress Protection] which protects from the failure of the = egress/destination, and hence do change the destination/egress. (full disclosure, I’m co-author of [Egress P= rotection] )

 

I think that both are different and that properties are di= fferent, hence using the same name is misleading.

In particular, in the first one, the destination/egress is= unchanged and hence properties of the destination/egress is unchanged: no = problem. While in the second case, a node (a ‘protector’ in [Egress Protection]) is claiming to provide = a similar service, but possibly only a subset of the original services or w= ithout the stateful states). Cf some discussion on the mailing list along &= #8220;How do I know that I can safely pretend that I’m the original destination?”

 

 

Personally I would propose to replace “Node Protecti= on” by “Segment Protection” or “Segment Egress Prot= ection” or “IGP Segment Egress Protection” since the prop= osal seem restricted to IGP knowledge.

<Shraddha> I agree that using the term node protection is confusin= g. I think that “segment protection” is the  right  t= erm.

[Bruno] works for me.

 =

  Using egress keyword may cause other confusions because term egre= ss is used in egress protection RFCs to mean the egress nodes on which the = services reside. In this draft the focus is on nodes that are not egresses.

[Bruno] Regarding the term “Egress”, it looks to me that you’re considering the position of the ingress (PE) which= is well aware of the distinction between the service egress and the SR pol= icy used to steer on a specific path. From a P/PLR standpoint, I’d ar= gue that the P is forwarding based on the top label and for him, the destination for the label/FEC is the egress. This s= eem to match the definition from RFC 3031

  In other words, we can speak of the level m LSP for Packet P as the<= o:p>

   sequence of routers:

[…]

3. which ends (at an "LSP Egress") when a forwarding de= cision is

     &n= bsp;   made by label Switching on a level m-k label, where k>0

 

IOW, if there are N labels on a packet, there are N egresses.

https://too= ls.ietf.org/html/rfc3031#section-3.15

 

Regarding [Egress Protec= tion] I agree that in general, the text could be read as only protecting a “service”.

However I believe that i= t covers the case of hierarchical transport LSPs:

From the abstract: “This document specifies a fast reroute framew= ork for protecting IP/MPLS services and MPLS transport tunnels against egress node and egress link failures.”

From the introduction: “In MPLS networks, Label Switched Paths (L= SPs) are widely used as transport tunnels to carry IP and MPLS services across MPLS domains. Examples of MPLS services are La= yer 2 VPNs, Layer 3 VPNs, hierarchical LSPs, and others.”

[/Bruno]

 =

 =

[LFA] https://tools.ietf.org/html/rfc5286

[RLFA node protection]= https://tools.iet= f.org/html/rfc8102

[Egress Protection] https://tools.ietf.org/html/rfc8679

 

 

2)  &n= bsp;    

Both do not seem to co-operate.

<Shraddha> Actually, egress protection as defined in RFC 8679 work= s well with procedures defined in this draft. Section 3.4 briefly talks abo= ut this.

Initial versions of this draft had examples to describe how egress prote= ction works in conjunction with procedures described in this draft.

Basically, egress protection described in RFC 8679 uses a context-id and= context label. When the penultimate hop creates protection for the context= -id routes

It follows the procedures described in RFC 8679 ( in conjunction with mi= rror-sid for SR networks). We also have a simplified version of RFC 8679 wh= ich uses anycast SIDs and static service labels

Described in draft-hegde-rtgwg-egress-protection-sr-network. This anycas= t based egress protection also works well with protection procedures descri= bed in this document.

I’ll add a section with examples to describe this which can help c= larify.

[Bruno] I did read section 3.4 but it just states that RFC 8679 “is applicable”. May be adding a section with an= example will help, thanks for this.

In the meantime, my concern is that:

- =          =A73.1 populates= the contect label only with SR Prefix & Adjac= ency SIDs

- =          A priori, during= the lookup in a MPLS (context) table, if no match is found, the packet is dropped. https://tools.ietf.org/html/rfc3031#section-3.18

Hence my conclusion that= the proposition would drop the service packet rather than sending it to a protector node as per RFC 8679.

[/Bruno]

 =

The draft applies the egress protection even though it can= only protections IGP segments/labels while [Egress Protection] would provi= de a much broader protection, including service (e.g. VPNs) protection. Hence it seems to break [Egress Protection= ] VPN service protection.

<Shraddha> No this draft does not break VPN service protection. I&= #8217;ll add detailed examples.

 

I would propose that the draft refers a bit more to [Egres= s Protection], uses its terminology if/when appropriate and then elaborate = on the above issue. From a technical standpoint, I would propose to privilege the use of a (complete) Protector (as per [Eg= ress Protection] ) if available.

<Shraddha> This draft makes use of looking up the second label in = the stack for protection. It is different from protector based approach.

[Bruno] IMHO, conceptually this draft combines both the PLR (first packet lookup) and Protector (second packet lookup) on= the same node.

That been said, RFC8679 is a large doc and relatively complex given the general scope that it is trying to achieve, hence making= its reading mandatory would probably add complexity for little benefit. Ye= t, since you have a section dedicated on Egress Protection (=A73.4) may be = a better description of how both document interact may be useful. Up to you.=

draft-hu-spring-segment-routing-proxy-forwarding Is more closer to prote= ctor based approach I think. It comes with an overhead of  configuring= the

primary and proxy pairs for set of nodes.

 

Finally, as also raised by Zhibo, the scalability properti= es of the draft is not optimal, and in particular less optimal than [Egress= Protection].=

<Shraddha>I’ll add some more text on scalability.  Sect= ion 5 of the draft proposes an optimisation to reduce scale.

[Bruno] ok, thanks.

[/Bruno]

Indeed, most of the work/states is on a Protector node (ha= ving the context mpls forwarding table). For a given failure, [Egress Prote= ction] allows for a single Protector while this drafts requires N Protectors (one per neighbour). So more states in t= he network and on nodes. Also [Egress Protection] allows to distribute this= load while the draft requires the PLR to handle the protection for all its= neighbhors.

Since this draft restricts to IGP Segments, the scalabilit= y impact his limited but still exist.

(on the pro side, the draft avoids the additional transpor= t cost/delay required to reach the Protector (since PLR and Protector are c= o-located)/

<Shraddha> Fair point. I would see the advantage of this draft is = more from operational perspective since it does not require primary protect= or configs.

Enabling the feature with one single knob on the router will be good eno= ugh.

[Bruno] In addition, this draft is better in term of incremental deployment with incremental benefit as you have an inc= remental benefit with the first new node.

In some cases, it could be seen a providing a better delay/jitter as it does not add the extra path up to the protector.= (but this is very deployment specific)

Thanks,

--Bruno

[/Bruno]

 =

Regards,

Bruno

 

 

From: spring [<= a href=3D"mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org] On Behalf Of bruno.decr= aene@orange.com
Sent: Thursday, July 30, 2020 2:25 PM
To: spring@ietf.org
Cc: draft-hegde-spring-node-protection-for-sr-te-paths@ietf.org
Subject: [spring] WG adoption call for draft-hegde-spring-node-prote= ction-for-sr-te-paths

 

Hi SPRING WG,

 

Authors of draft-hegde-spring-node-protection-for-sr-te-paths  [1] = have asked for WG adoption.

 

Please indicate your support, comments, or objection, for adopting this = draft as a working group item by August 20th 2020. (*)

 

Could those who are willing to work on this document, please notify the = list. That gives us an indication of the energy level in the working group = to work on this.

 

Thanks,

Regards,

Bruno, Jim, Joel

 

[1] https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-te-pa= ths-07

(*) 3 weeks to account for the IETF meeting week and the august/summer p= eriod.

 

______________________________________________________________________=
___________________________________________________
 
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pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
If you have received this email in error, please notify the sender and=
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pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
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This message and its attachments may contain confidential or privilege=
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Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
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te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
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dCB0aGUgREEgb24gcGFja2V0cyBhcmUgbm90IGNoYW5nZWQgaW4gdHJhbnNpdCwgYW5kIG9uZSBj b3VsZCB1c2UgSVBzZWMgdG8gbWl0aWdhdGUgdGhhdCBpc3N1ZS4NCjwvc3Bhbj48c3BhbiBzdHls ZT0iZm9udC1zaXplOjkuMHB0O2ZvbnQtZmFtaWx5OiZxdW90O0hlbHZldGljYSZxdW90OyxzYW5z LXNlcmlmIj5JdOKAmXMgcHJvYmFibHkgd29ydGh3aGlsZSBtZW50aW9uaW5nIHNvbWV0aGluZyBs aWtlIHRoYXQuPC9zcGFuPjxvOnA+PC9vOnA+PC9wPg0KPC9kaXY+DQo8L2Jsb2NrcXVvdGU+DQo8 L2Rpdj4NCjxwIGNsYXNzPSJNc29Ob3JtYWwiPjxvOnA+Jm5ic3A7PC9vOnA+PC9wPg0KPC9kaXY+ DQo8L2JvZHk+DQo8L2h0bWw+DQo= --_000_MWHPR11MB137477559AF7955E2EC6FB31C9230MWHPR11MB1374namp_-- From nobody Mon Sep 14 11:50:50 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 822073A0DF6; Mon, 14 Sep 2020 11:50:48 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Brian Haberman via Datatracker To: Cc: last-call@ietf.org, draft-ietf-spring-srv6-network-programming.all@ietf.org, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <160010944848.21991.11984187873336962718@ietfa.amsl.com> Reply-To: Brian Haberman Date: Mon, 14 Sep 2020 11:50:48 -0700 Archived-At: Subject: [spring] Intdir telechat review of draft-ietf-spring-srv6-network-programming-18 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 18:50:49 -0000 Reviewer: Brian Haberman Review result: On the Right Track Section 3 - - - - - - - The abbreviated description of the section is a bit confusing related to FIB lookup. This text: When an SRv6 SID is in the Destination Address field of an IPv6 header of a packet, it is routed through an IPv6 network as an IPv6 address. Its processing is defined in [RFC8754] section 4.3 and reproduced here as a reminder. makes it sound like all FIB lookups are being done on SIDs whereas the text in 8754, section 4.3 is much clearer that the lookups occur on IPv6 addresses and that some may be SIDs. Section 3.1 - - - - - - This document defines an SRv6 SID as consisting of LOC:FUNCT:ARG, where a locator (LOC) is encoded in the L most significant bits of the SID, followed by F bits of function (FUNCT) and A bits of arguments (ARG). L, the locator length, is flexible, and an operator is free to use the locator length of their choice. F and A may be any value as long as L+F+A <= 128. When L+F+A is less than 128 then the remainder of the SID MUST be zero. Does a system outside of the SR Ingress Node need to discover L? If so, is it derived from seeing a FIB entry for LOC? How does the a system determine the length of F and A? By comparing FIB entries for LOC and LOC:FUNCT (that is what I infer from section 3.2)? The parsing rules seem incomplete and can lead to behavior that is non-deterministic. The same can be said for B:N. What are the guidelines for choosing LOC (or B)? Does this come strictly out of the unicast address space? ULA space? Does this spec support LOC being allocated out of multicast space? The following text seems rather limiting: The ARG value of a routed SID SHOULD remain constant among packets in a given flow. Varying ARG values among packets in a flow may result in different ECMP hashing and cause re-ordering. If ARG needs to stay constant, does this limit the types of functions that can be implemented using this technique? Section 3.2 - - - - - - The various paragraphs that describe “example deployments” really don’t belong in a standards track document. If they are needed to explain the approach, then the description of the approach is incomplete. The reader should not have to infer functionality by parsing example uses. If the examples remain, I suggest they be put in an informative appendix. What constitutes a “remote node”? Section 4 - - - - - I would suggest either mentioning that these behaviors are managed via an IANA registry or I would add a forward pointer to the IANA Considerations section. Section 4.16.1.2 - - - - - - - - The steps described to process the SRH (i.e., instruction S14.4) is different from the process described for SRH processing in RFC 8754, Section 4.3.1.1. RFC 8754 seems to only create an SRH in an encapsulating header (i.e., no SRH insertion). Why does this draft specify SRH removal? Section 5.1 - - - - - - What is the relationship between node N and the address T used as the source address of the encapsulating header? Section 6 - - - - - This section could use some introductory text to explain what is meant by an Operation. Section 7 - - - - - Is there a security issue if a SID is used as a source address? Should any part of the prefix being used for SIDs be advertised to external peers/networks? From nobody Mon Sep 14 14:17:55 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B63853A096C; Mon, 14 Sep 2020 14:17:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l53gKMM0l8kC; Mon, 14 Sep 2020 14:17:52 -0700 (PDT) Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ABF6A3A0967; Mon, 14 Sep 2020 14:17:48 -0700 (PDT) Received: by mail-lf1-x12f.google.com with SMTP id x77so853361lfa.0; Mon, 14 Sep 2020 14:17:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ncGk68yZVW7IT8eIYfbWSpxlf+bDoyWsU6Wz//p7pCE=; b=t9OeoJXbh9zPgO4pQSHGnidVGxHw1oh6A2TEyUSa8kDRjR1WnfgWTrqVd/SjLZ5kuU zDbqr0LeUyWNPVSF00FcmGuTrzvgaqcNK5hpUVsUCfm8W4URKfWtTYllhytaZu+f1zpK QmxIf9hncaZLfB6PCDEucGIlrhZ9F2bNgZdp8i7LQ7y/jZHYgHU4/2SBKcVZLhT6PYkT 6KMLmmJ1jb66C16L/G1GwM5f2r7nIlIuDzANTbijj7UcukzuPmbysdtxT3xefDIHePc8 wXO+X8iyo0lg7CNqV/q4XId9g0Z2BL6M5AVymHsrPRS0O5XgUvWGB8Dx8GE6IiTsImoB Fo6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ncGk68yZVW7IT8eIYfbWSpxlf+bDoyWsU6Wz//p7pCE=; b=BYqjMtHEjRPWpiLBJTAtK3F1uO+VB174ObLN6YkS8bhikhPp0f+dMPKOQveXYhzvbz w5b9hYFuDd7OgyF5fl8VP8N66KP/EvRA+8rUDg1hYZLnTajDXj5RPZxS0PAA0J56duXY UQ7fEDDggb3FfexcDWp13fRMUlMNjxPVoQTwrKGIvhYmKTfbtM5ykTn2IBMkrE5Hwhpr ABEQI+yBixIDhIuKulrfuLZqZs8jIv4EcnOKvwKnJEUk2DzkiVr63Ky90m+yfXWS6rpJ IOAVGpelXl+Cm6CwGP6H0f0K9kWOE5R7lEbbDU7OMfr8YbFby/39cWyB+u/SP5ZdLoM9 yI+A== X-Gm-Message-State: AOAM532bM7h9nWkWzmLPKvyq20ht7JOXd4zz7MWUraVB2HgeCryaARx+ zErpOHVe5hCFDOjtr3R5vgr3kTLyCuF0aWq3qnbUvuylUtk= X-Google-Smtp-Source: ABdhPJxjIbq96Fa0PoYXEU/v6qMVyObV//svi6/v6EIAVGkGX++ntdhAt7jQYPUymZB3Ohekj3VrK6MEZxIY9HyTjgA= X-Received: by 2002:ac2:495a:: with SMTP id o26mr5715449lfi.94.1600118266367; Mon, 14 Sep 2020 14:17:46 -0700 (PDT) MIME-Version: 1.0 References: <159958851173.6820.10542475922462723282@ietfa.amsl.com> In-Reply-To: <159958851173.6820.10542475922462723282@ietfa.amsl.com> From: Greg Mirsky Date: Mon, 14 Sep 2020 14:17:35 -0700 Message-ID: To: IETF Secretariat Cc: spring , spring-chairs@ietf.org, draft-mirsky-spring-bfd@ietf.org Content-Type: multipart/alternative; boundary="000000000000dd93d905af4c901e" Archived-At: Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state "Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 21:17:54 -0000 --000000000000dd93d905af4c901e Content-Type: text/plain; charset="UTF-8" Dear All, I support the adoption of draft-mirsky-spring-bfd by the SPRING WG for the following reasons: - optional control of the reverse path of the BFD session in SR-MPLS environment; - optional reduction of OAM data exchanged between BFD systems by using the BFD in Demand mode over an SR-MPLS tunnel; - ability to monitor p2mp SR policies. I want to highlight the third point. BFD (based on RFC 5880) has solutions for lightweight mechanisms to detect defects in a p2mp tunnel. The solution defined in RFC 8562 allows egress BFD nodes to monitor the state of the head-end and related part of the multicast distribution tree. In some scenarios, it is desirable for the head-end to be able to know the state of an egress node and egress's view of the distribution tree. Three options listed in RFC 8563: - head notifications with multicast polling - head notifications with composite polling - unsolicited notifications The two first options described in RFC 8563 in detail while the third is very sketchy. This is the option discussed in the draft, pointing to the solution defined in draft-mirsky-mpls-p2mp-bfd. Always welcome your questions. Regards, Greg On Tue, Sep 8, 2020 at 11:08 AM IETF Secretariat < ietf-secretariat-reply@ietf.org> wrote: > > The SPRING WG has placed draft-mirsky-spring-bfd in state > Call For Adoption By WG Issued (entered by Joel Halpern) > > The document is available at > https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ > > Comment: > The authors have requested (quite some time ago) WG adoption for this > document. Looking at the archive, there was anot a lot of discussion, and > some concerns. Rather than try to infer the current state from the old > discussions, the WG Chairs have decided to issue a WG call for adoption. > If > you support this becoming a WG document, please explain on the list. If > you > oppose this becoming a WG document, please explain on the list. Silence > does > not mean consent. > > Yours, > Joel M. Halpern > > --000000000000dd93d905af4c901e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear All,
I support the adoption of draft-mirsky-sprin= g-bfd by the SPRING WG for the following reasons:
  • optiona= l control of the reverse path of the BFD session in SR-MPLS environment;
  • optional reduction of OAM data exchanged between BFD systems by using= the BFD in Demand mode over an SR-MPLS tunnel;
  • ability to monitor = p2mp SR policies.
I want to highlight=C2=A0the third=C2=A0point. B= FD (based on RFC 5880) has solutions for lightweight mechanisms to detect d= efects in a p2mp tunnel. The solution defined in RFC 8562 allows egress BFD= nodes to monitor the state of the head-end and related part of the multica= st distribution tree. In some scenarios, it is desirable for the head-end t= o be able to know the state of an egress node and egress's=C2=A0view of= the distribution tree. Three options listed in RFC 8563:
    head notifications with multicast polling
  • head notifications with = composite polling
  • unsolicited notifications
The two first = options described=C2=A0in RFC 8563 in detail while the third is very sketch= y. This is the option discussed in the draft, pointing to the solution defi= ned in draft-mirsky-mpls-p2mp-bfd.=C2=A0

Always we= lcome your questions.

Regards,
Greg

On Tue, Sep 8, 2020 at 11:08 AM IETF Secretariat <ietf-secretariat-reply@ietf.org> wrote= :

The SPRING WG has placed draft-mirsky-spring-bfd in state
Call For Adoption By WG Issued (entered by Joel Halpern)

The document is available at
https://datatracker.ietf.org/doc/draft-mi= rsky-spring-bfd/

Comment:
The authors have requested (quite some time ago) WG adoption for this
document.=C2=A0 Looking at the archive, there was anot a lot of discussion,= and
some concerns.=C2=A0 Rather than try to infer the current state from the ol= d
discussions, the WG Chairs have decided to issue a WG call for adoption.=C2= =A0 If
you support this becoming a WG document, please explain on the list.=C2=A0 = If you
oppose this becoming a WG document, please explain on the list.=C2=A0 Silen= ce does
not mean consent.

Yours,
Joel M. Halpern

--000000000000dd93d905af4c901e-- From nobody Mon Sep 14 15:24:27 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C5CE3A0B21; Mon, 14 Sep 2020 15:24:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Umt5d7ByZaCd; Mon, 14 Sep 2020 15:24:24 -0700 (PDT) Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 00A023A0B0A; Mon, 14 Sep 2020 15:24:23 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id d19so245902pld.0; Mon, 14 Sep 2020 15:24:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version; bh=7hG3VUSlX7RXOOYtWXN3o95HDt/oXPfuYKQyu5rTfW8=; b=M9SHsYNi2Xv1xK/mR+yi6ZVSmzXlVzYoMWUiLo9NomwCSF1weCRIvad0lD6Y8Y7QsZ Jr028bwtABH2zXxjM2rhDYyNYMyY8E9UPSNuPMP4EzXPHrTBPRY+TD3qFPOaz66JpPuC ozvdcIoJwboj77ShKtmGTHHQC+uW3Zrj2ZEQB6h5uGUF196LwswOtlhxTMcfjE5+j+ZR i3BOx/Uv2Ub4zmivbqDn8vICJPR2b8UHlkU04y6uBfKv+tdKcrAaD1AOU+FcZSO6eAMC NMmFQ/iLPJE7t+51oaIJf+Fk1EAUwT0QFbp5dn8LR3mgiMHUqxRP5YgyaNI6mhRu18wU 9HQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version; bh=7hG3VUSlX7RXOOYtWXN3o95HDt/oXPfuYKQyu5rTfW8=; b=Y6+47vWJ+YJqFm6kXlgLDa7LatQUuWE4QIc0H4ZlDfwvpO4FihbLC3YzPKrL+yQG9j simHMaJbvvuCIXH6nrG2fOoX8aipFRx7t8BkPPiP3Z7PTo4TCwcynJXhcIlXEr6Qhtho gNAnLq8rbi7sI3htpZnVaXEPBzc0md4oc0CkG2TzQBXDhtrmCOo84dnGjMEkK66VKBHH 4lvZ3doHPc1woOR1AwUoGawx4e5Rybm0DOFB9zhMOSfGLMa5W4vsTTkW9dvr5zOQ88+V tV0GdtvLaw0D6vBoEc9+8/uIW+UnR2mQKW48q9pk1FqV2xB73uOugk5xHAOcRZ4slBLp KGdA== X-Gm-Message-State: AOAM533GP+gd22VyTMQOqBZSsS4SaLpb7BUKvm9qvcb4G+o+fnGVet+p zMdMd2KnPAO5DWu1CFGWfXaUlnjkpVw= X-Google-Smtp-Source: ABdhPJyuUNCTpWew04jrygVxGX5hihlESejULuQlby9tHGU+b7M8apq1yAIvYj/qF62HvHJXzwHVCA== X-Received: by 2002:a17:90b:1649:: with SMTP id il9mr1316578pjb.94.1600122263117; Mon, 14 Sep 2020 15:24:23 -0700 (PDT) Received: from [192.168.1.18] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id q34sm9041819pgl.28.2020.09.14.15.24.21 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Sep 2020 15:24:22 -0700 (PDT) Date: Mon, 14 Sep 2020 15:24:09 -0700 From: Jeff Tantsura To: IETF Secretariat , Greg Mirsky Cc: spring , spring-chairs@ietf.org, draft-mirsky-spring-bfd@ietf.org Message-ID: <5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark> In-Reply-To: References: <159958851173.6820.10542475922462723282@ietfa.amsl.com> X-Readdle-Message-ID: 5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5f5fed95_8138641_5228" Archived-At: Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state "Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 22:24:26 -0000 --5f5fed95_8138641_5228 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I support the adoption as co-author, for the reasons outlined by Greg. Cheers, Jeff On Sep 14, 2020, 2:17 PM -0700, Greg Mirsky , wr= ote: > Dear All, > I support the adoption of draft-mirsky-spring-bfd by the SPRING WG for = the following reasons: > > =E2=80=A2 optional control of the reverse path of the B=46D session in = SR-MPLS environment; > =E2=80=A2 optional reduction of OAM data exchanged between B=46D system= s by using the B=46D in Demand mode over an SR-MPLS tunnel; > =E2=80=A2 ability to monitor p2mp SR policies. > > I want to highlight=C2=A0the third=C2=A0point. B=46D (based on R=46C 58= 80) has solutions for lightweight mechanisms to detect defects in a p2mp = tunnel. The solution defined in R=46C 8562 allows egress B=46D nodes to m= onitor the state of the head-end and related part of the multicast distri= bution tree. In some scenarios, it is desirable for the head-end to be ab= le to know the state of an egress node and egress's=C2=A0view of the dist= ribution tree. Three options listed in R=46C 8563: > > =E2=80=A2 head notifications with multicast polling > =E2=80=A2 head notifications with composite polling > =E2=80=A2 unsolicited notifications > > The two first options described=C2=A0in R=46C 8563 in detail while the = third is very sketchy. This is the option discussed in the draft, pointin= g to the solution defined in draft-mirsky-mpls-p2mp-bfd. > > Always welcome your questions. > > Regards, > Greg > > > On Tue, Sep 8, 2020 at 11:08 AM IET=46 Secretariat wrote: > > > > > > The SPRING WG has placed draft-mirsky-spring-bfd in state > > > Call =46or Adoption By WG Issued (entered by Joel Halpern) > > > > > > The document is available at > > > https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ > > > > > > Comment: > > > The authors have requested (quite some time ago) WG adoption for th= is > > > document.=C2=A0 Looking at the archive, there was anot a lot of dis= cussion, and > > > some concerns.=C2=A0 Rather than try to infer the current state fro= m the old > > > discussions, the WG Chairs have decided to issue a WG call for adop= tion.=C2=A0 If > > > you support this becoming a WG document, please explain on the list= .=C2=A0 If you > > > oppose this becoming a WG document, please explain on the list.=C2=A0= Silence does > > > not mean consent. > > > > > > Yours, > > > Joel M. Halpern > > > --5f5fed95_8138641_5228 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
I support the adoption as co-author, for the reason= s outlined by Greg.

Cheers,
Jeff
On Sep 14, 2020, 2:17 PM -0700, Gre= g Mirsky <gregimirsky=40gmail.com>, wrote:
Dear All,
I support the adoption of draft-mirsky-spring-bfd by the SPRING WG f= or the following reasons:
  • optional control of the reverse path of the B=46D session in SR-MPLS = environment;
  • optional reduction of OAM data exchanged between B=46D systems by usi= ng the B=46D in Demand mode over an SR-MPLS tunnel;
  • ability to monitor p2mp SR policies.
I want to highlight&=23160;the third&=23160;point. B=46D (based on R=46C = 5880) has solutions for lightweight mechanisms to detect defects in a p2m= p tunnel. The solution defined in R=46C 8562 allows egress B=46D nodes to= monitor the state of the head-end and related part of the multicast dist= ribution tree. In some scenarios, it is desirable for the head-end to be = able to know the state of an egress node and egress's&=23160;view of the = distribution tree. Three options listed in R=46C 8563:
  • head notifications with multicast polling
  • head notifications with composite polling
  • unsolicited notifications
The two first options described&=23160;in R=46C 8563 in detail while the = third is very sketchy. This is the option discussed in the draft, pointin= g to the solution defined in draft-mirsky-mpls-p2mp-bfd.&=23160;

Always welcome your questions.

Regards,
Greg

On Tue, Sep 8, 2020 at 11= :08 AM IET=46 Secretariat <ietf-secretariat-reply=40ietf.org> wrote:

The SPRING WG has placed draft-mirsky-spring-bfd in state
Call =46or Adoption By WG Issued (entered by Joel Halpern)

The document is available at
https://datatracker.ietf.= org/doc/draft-mirsky-spring-bfd/

Comment:
The authors have requested (quite some time ago) WG adoption for this
document.&=23160; Looking at the archive, there was anot a lot of discuss= ion, and
some concerns.&=23160; Rather than try to infer the current state from th= e old
discussions, the WG Chairs have decided to issue a WG call for adoption.&= =23160; If
you support this becoming a WG document, please explain on the list.&=231= 60; If you
oppose this becoming a WG document, please explain on the list.&=23160; S= ilence does
not mean consent.

Yours,
Joel M. Halpern

--5f5fed95_8138641_5228-- From nobody Mon Sep 14 16:11:20 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4FA03A00D2; Mon, 14 Sep 2020 16:11:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TqueJsiHv71V; Mon, 14 Sep 2020 16:11:17 -0700 (PDT) Received: from mail-ua1-x936.google.com (mail-ua1-x936.google.com [IPv6:2607:f8b0:4864:20::936]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C60503A0044; Mon, 14 Sep 2020 16:11:16 -0700 (PDT) Received: by mail-ua1-x936.google.com with SMTP id w3so398606uad.12; Mon, 14 Sep 2020 16:11:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=23mcjLb4L6ypy17ZCpUTltNSnXaCmuZlhY7X6qzwDZ0=; b=XIEIiNog1RPmOsdRD+wPJpp0Q6fA7f5gJxsgpqEjIHEFcUj2WcbcjMbrmvfH+bjiB8 e+J3anWCDrKhU85MoeWeB1zDxp/Bg1Ic0bi0iLy0/e9ZtiGKsUbyMqsXmtoaZm2WUvFZ WDhOnXGm4FmULfUmRj2+Fmpt5nlvA1EHSNtTV10qs5L1RMRXswY/KOA3BSZWFrzHmVle p9gGZgvOPWpIvLjx6+rgh2mFdH81Y24YOLtjwKWob9/cgB48fFfPTQFL7GAYhstMACVf uLw/T3W64+cp67y+T9yyuR6IpsSqJGcFjlidYqFe4bC5OzYWp136kA5XwZxVl0ZoAbHL 1MLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=23mcjLb4L6ypy17ZCpUTltNSnXaCmuZlhY7X6qzwDZ0=; b=e3VEIBgTeWnTLh7WlGI5YTf6WV3HWGWnMiaQBo4dur1Xw8kqEbKOVM7964WOdvanc/ ObVh/+7hNg/hZsekclSNV0DbPrZksYljbAm3wmktQy/Vn9I38tLwQ0t522qh4WNAzC/C 2ax708hWMh/L0a37RDaPVw1kTx8u1ncQ5YuYTZcdzbSpukP1rMq4EziYooOIhNs83xPK VhbM916tbNW2Fz18gt4KloAPq/uu0CEVrfoJx7qXuO6QazllBkOMhErUrFwUDRS5ZUfV A6ftxWynEKZGamtHpBaUa4tcisODqVuOV7oy9DwctRGqVickcWFSKeZgMwiO3uI3vORN 8kDw== X-Gm-Message-State: AOAM532/Af/eqKS0jkuLn5LMjumpcUeqbAnIh5ztDNjR8+WOYj85zXiO A7K6QoR49SgRrhNjqwls+g5VAAVWdshIWKjfXw4= X-Google-Smtp-Source: ABdhPJyzXPeIWeiSqf96ta7e4D0zbAi6z35aBa2wg+Po2xovJHfPYaygeLhQBR+Kxb8ery8CiBOKZjhppSJUMNVjUt0= X-Received: by 2002:ab0:4e25:: with SMTP id g37mr8274001uah.106.1600125075820; Mon, 14 Sep 2020 16:11:15 -0700 (PDT) MIME-Version: 1.0 References: <159958851173.6820.10542475922462723282@ietfa.amsl.com> <5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark> In-Reply-To: <5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark> From: Gyan Mishra Date: Mon, 14 Sep 2020 19:11:05 -0400 Message-ID: To: Jeff Tantsura Cc: Greg Mirsky , IETF Secretariat , draft-mirsky-spring-bfd@ietf.org, spring , spring-chairs@ietf.org Content-Type: multipart/alternative; boundary="000000000000bd94ee05af4e2605" Archived-At: Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state "Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 23:11:19 -0000 --000000000000bd94ee05af4e2605 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I support WG adoption of this well written draft for the reasons outlined by Greg. I wanted to note an orthogonal caveat related to this draft for monitoring of SR-MPLS P2MP P-Tree. RFC 8562 and RFC 8563 relates to mLDP PTA P-Tree, however in a pure SR-MPLS environment where LDP has been eliminated that P2MP trees would have to be provided via some other mechanism, IR, replication SID or BIER. However there are some use cases where operators end up keeping LDP present for mLDP extension use for PMSI P-Tree instantiation for =E2=80=9Cmulticast= =E2=80=9D only and use SR-MPLS for =E2=80=9Cunicast=E2=80=9D. In this case the P2MP P-Tre= e over MPLS is relevant to the draft. Thank you Gyan On Mon, Sep 14, 2020 at 6:24 PM Jeff Tantsura wrote: > > > > > > > > > > > > > I support the adoption as co-author, for the reasons outlined by Greg. > > > > > > > > Cheers, > > Jeff > > > > > > > On Sep 14, 2020, 2:17 PM -0700, Greg Mirsky , > wrote: > > > > > Dear All, > > I support the adoption of draft-mirsky-spring-bfd by the SPRING WG for th= e > following reasons: > > > > > > > > - optional control of the reverse path of the BFD session in SR-MPLS > environment; > > - optional reduction of OAM data exchanged between BFD systems by > using the BFD in Demand mode over an SR-MPLS tunnel; > > - ability to monitor p2mp SR policies. > > > > > I want to highlight the third point. BFD (based on RFC 5880) has solution= s > for lightweight mechanisms to detect defects in a p2mp tunnel. The soluti= on > defined in RFC 8562 allows egress BFD nodes to monitor the state of the > head-end and related part of the multicast distribution tree. In some > scenarios, it is desirable for the head-end to be able to know the state = of > an egress node and egress's view of the distribution tree. Three options > listed in RFC 8563: > > > > > > > > - head notifications with multicast polling > > - head notifications with composite polling > > - unsolicited notifications > > > > > The two first options described in RFC 8563 in detail while the third is > very sketchy. This is the option discussed in the draft, pointing to the > solution defined in draft-mirsky-mpls-p2mp-bfd. > > > > > > Always welcome your questions. > > > > > > Regards, > > > Greg > > > > > > > > > > On Tue, Sep 8, 2020 at 11:08 AM IETF Secretariat < > ietf-secretariat-reply@ietf.org> wrote: > > > >> >> >> The SPRING WG has placed draft-mirsky-spring-bfd in state >> >> >> Call For Adoption By WG Issued (entered by Joel Halpern) >> >> >> >> >> >> The document is available at >> >> >> https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ >> >> >> >> >> >> Comment: >> >> >> The authors have requested (quite some time ago) WG adoption for this >> >> >> document. Looking at the archive, there was anot a lot of discussion, a= nd >> >> >> some concerns. Rather than try to infer the current state from the old >> >> >> discussions, the WG Chairs have decided to issue a WG call for adoption. >> If >> >> >> you support this becoming a WG document, please explain on the list. If >> you >> >> >> oppose this becoming a WG document, please explain on the list. Silence >> does >> >> >> not mean consent. >> >> >> >> >> >> Yours, >> >> >> Joel M. Halpern >> >> >> >> > > > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000bd94ee05af4e2605 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I support WG adoption of this well written= draft for the reasons outlined by Greg.=C2=A0

<= /div>
I wanted to note an orthogonal caveat =C2=A0related = to this draft for monitoring of SR-MPLS P2MP P-Tree. =C2=A0=C2=A0

RFC 8562 and RFC 8563 relates to = mLDP PTA P-Tree, however in a pure SR-MPLS environment where LDP has been e= liminated that =C2=A0P2MP trees would have to be provided via some other me= chanism, =C2=A0IR, replication SID or BIER. =C2=A0
<= br>
However there are some use cases where operators= end up keeping LDP present for mLDP extension use for PMSI P-Tree instanti= ation for =E2=80=9Cmulticast=E2=80=9D only and use SR-MPLS for =E2=80=9Cuni= cast=E2=80=9D.=C2=A0 In this case the P2MP P-Tree over MPLS is relevant to = the draft.

Thank you=C2= =A0

Gyan

<= div class=3D"gmail_quote">
On Mon, Sep= 14, 2020 at 6:24 PM Jeff Tantsura <jefftant.ietf@gmail.com> wrote:









=

I support the adoption as co-author, for the reas= ons outlined by Greg.







Cheers,

Jeff





On Sep 14,= 2020, 2:17 PM -0700, Greg Mirsky <gregimirsky@gmail.com>, wrote:




Dear All,

I support the adoption of draft-mirsky-spring-b= fd by the SPRING WG for the following reasons:






  • optional control of the reverse path of the BFD session in SR= -MPLS environment;


  • optional reduction of OAM data exchanged= between BFD systems by using the BFD in Demand mode over an SR-MPLS tunnel= ;


  • ability to monitor p2mp SR policies.



    • I want to highlight=C2=A0the third=C2=A0point. BFD (based on RFC 5880)= has solutions for lightweight mechanisms to detect defects in a p2mp tunne= l. The solution defined in RFC 8562 allows egress BFD nodes to monitor the = state of the head-end and related part of the multicast distribution tree. = In some scenarios, it is desirable for the head-end to be able to know the = state of an egress node and egress's=C2=A0view of the distribution tree= . Three options listed in RFC 8563:






      <= li>head notifications with multicast polling

    • head notificat= ions with composite polling


    • unsolicited notifications
      • <= br>


    The two first options described=C2=A0in RFC 8563 in det= ail while the third is very sketchy. This is the option discussed in the dr= aft, pointing to the solution defined in draft-mirsky-mpls-p2mp-bfd.=C2=A0<= /div>




    Always welcome your questions.




    Regards,


    Greg
    =








    On Tue, Sep 8, 2020 at 11:08 AM IETF Secret= ariat <ietf-secretariat-reply@ietf.org> wrote:





    The SPRING WG has placed draft-mirsky-spring-bfd in s= tate


    Call For Adoption By WG Issued (entered by Joel Halpern)




    The document is available at


    https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/=





    Comment:


    The authors have requested = (quite some time ago) WG adoption for this


    document.=C2=A0 Looki= ng at the archive, there was anot a lot of discussion, and


    some = concerns.=C2=A0 Rather than try to infer the current state from the old
    =

    discussions, the WG Chairs have decided to issue a WG call for adop= tion.=C2=A0 If


    you support this becoming a WG document, please e= xplain on the list.=C2=A0 If you


    oppose this becoming a WG docum= ent, please explain on the list.=C2=A0 Silence does


    not mean con= sent.





    Yours,


    Joel M. Halpern


    <= br>












    _______________________________________________

    = spring mailing list

    spring@ietf.org

    https://www.ietf.org/mai= lman/listinfo/spring

    --

    <= a href=3D"http://www.verizon.com/" style=3D"color:rgb(17,85,204);padding-bo= ttom:1em;display:inline-block" target=3D"_blank">

    Gyan Mishra

    Network Solutions Architect=C2=A0

    , "Ketan Talaulikar (ketant)" , "Pablo Camarillo (pcamaril)" CC: "G. Sri Karthik Goud" , SPRING WG , Deepti Rathi Thread-Topic: SRV6 OAM (USP SID) Thread-Index: AdaKemmq5NpsAtGzTPS1g8PV0XHmqwAd9T+g Date: Mon, 14 Sep 2020 23:54:01 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.5.0.60 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-09-14T09:36:04Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=1c72c92f-eaef-4ef8-8e8a-5febfe22a91d; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=2 authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=juniper.net; x-originating-ip: [122.167.92.78] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 191b8e09-cc20-4370-e074-08d85909744b x-ms-traffictypediagnostic: MN2PR05MB5997: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: gbKaEA15t8mIN/pdiIRht69owhHJvmgGkRNMIUG6NL4xG/e56rEDSe3GvXoPuKUtApuUKqv25vlL2FaP1UtWV5uPPVxb3xs3CuydUD2Py41uuDmFGvUfFbnP3uA0NFtttL8RprNP61fquXMWks0RHCXJuRD383eFJ25tUWT0/JoZPypp40pP6+Imc34E8gsznCc4HLe0bx0hYZXAsWqw44QCfN29ifcYZQQosKA72W01yV1Wai1l/oFMdez/ox+GzKn8joSRRm5QQ7d9rOfvXhoH4UM5WMmJlQD1Vh5MCa9RpTQgEEptyJnd2YRe3VzfwDj2dGC1FCrBQL5M7AqvIyge0pah8yMx1wyFawExP3zpomZLo5p2aeWipTsgw6gQ/ZGkfgLTVqGRGzBky/8Afw== x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR05MB6080.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(346002)(136003)(39860400002)(396003)(376002)(366004)(2940100002)(2906002)(478600001)(6506007)(53546011)(76116006)(186003)(86362001)(66446008)(64756008)(66476007)(66946007)(26005)(7696005)(66556008)(110136005)(8676002)(54906003)(8936002)(107886003)(9686003)(5660300002)(316002)(4326008)(55016002)(52536014)(166002)(83380400001)(33656002)(71200400001); DIR:OUT; SFP:1102; x-ms-exchange-antispam-messagedata: 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 Content-Type: multipart/alternative; boundary="_000_MN2PR05MB6080D3627D29234E195BCE2BBE230MN2PR05MB6080namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB6080.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 191b8e09-cc20-4370-e074-08d85909744b X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Sep 2020 23:54:01.1923 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZAtTer16/A6wUu7kv0SwhiDiiVMbs1V12vrWta5PWPCNb3Vsoj6x77aHGfS51PbP5jdQZlTjfLkGAtzQ6nKOpQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB5997 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-14_09:2020-09-14, 2020-09-14 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 impostorscore=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 mlxlogscore=879 mlxscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009140181 Archived-At: Subject: Re: [spring] SRV6 OAM (USP SID) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Sep 2020 23:54:07 -0000 --_000_MN2PR05MB6080D3627D29234E195BCE2BBE230MN2PR05MB6080namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Please respond. Juniper Business Use Only From: spring On Behalf Of Rajesh M Sent: Monday, September 14, 2020 3:06 PM To: Zafar Ali (zali) ; Ketan Talaulikar (ketant) ; Pablo Camarillo (pcamaril) Cc: G. Sri Karthik Goud ; SPRING WG = ; Deepti Rathi Subject: [spring] SRV6 OAM (USP SID) [External Email. Be cautious of content] When ingress pings a USP SID, at the egress below code is executed. 4.16.2. USP: Ultimate S= egment Pop of the SRH The SRH processing of the End, End.X and End.T behaviors are modified: the instructions S02-S04 are substituted by the following ones: S02. If (Segments Left =3D=3D 0) { S03.1. Update the Next Header field in the preceding header to the Next Header value of the SRH S03.2. Decrease the IPv6 header Payload Length by the Hdr Ext Len value of the SRH S03.3. Remove the SRH from the IPv6 extension header chain S03.4. Proceed to process the next header in the packet S04. } May be we should explicitly state here "if next header is Upper layer heade= r then execute section 4.1.1" Juniper Business Use Only --_000_MN2PR05MB6080D3627D29234E195BCE2BBE230MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Please respond.

     

     

     

    Juniper Business Use Only

    From: spring <spring-bounces@ietf.org> = On Behalf Of Rajesh M
    Sent: Monday, September 14, 2020 3:06 PM
    To: Zafar Ali (zali) <zali@cisco.com>; Ketan Talaulikar (ketan= t) <ketant@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.= com>
    Cc: G. Sri Karthik Goud <gkarthik@juniper.net>; SPRING WG <= spring@ietf.org>; Deepti Rathi <deeptir@juniper.net>
    Subject: [spring] SRV6 OAM (USP SID)

     

    <= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

     

    When ingress pings a USP SID, at the egress below co= de is executed.

     

    4.16.2.  USP: Ultimate Segment Pop of the SRH

     
       The SRH processing of the End, End.X and End.T behaviors =
are
       modified: the instructions S02-S04 are substituted by the=
 following
       ones:
     
     S02.     If (Segments Left =3D=3D 0) {=

     S03.1.      Upd=
ate the Next Header field in the preceding header to the<=
/b>
           &nbs=
p;        Next Header value of the =
SRH
     S03.2.      Decrease the IPv6 header Payload=
 Length by the Hdr Ext Len
               &nbs=
p;    value of the SRH
     S03.3.      Remove the SRH from the IPv6 ext=
ension header chain
     S03.4.      Pro=
ceed to process the next header in the packet
     S04.     }

     

     

    May be we should explic= itly state here “if next header is Upper layer header then execute se= ction 4.1.1”

     

     

    Juniper Business Use Only

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boundary="_000_BYAPR05MB57187A0F92A24EAE365F3991D5200BYAPR05MB5718namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR05MB5718.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9962f3c8-0b00-4bb6-5515-08d8590e1576 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Sep 2020 00:27:09.5876 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: TnKfZUIdS6GOL1IaiArN6Ld2eP7gyqoe7sEGLzJqM6PXxpWVmjchVFzv6JQr3wMfYvELg/wLS5rkUXj371xLaA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB4407 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-14_09:2020-09-14, 2020-09-14 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 mlxscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 suspectscore=0 phishscore=0 clxscore=1011 mlxlogscore=999 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009150000 Archived-At: Subject: Re: [spring] SRV6 OAM (USP SID) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 00:27:15 -0000 --_000_BYAPR05MB57187A0F92A24EAE365F3991D5200BYAPR05MB5718namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Reframing the question: * Does the draft(oam/network programming) talk about supporting OAM fun= ctionality for END/END.X sids with USP/PSP flag set? * If it does, can you please point out to the relevant portion? Why isn= 't it explicitly stated like it is for USD and other END.D* Sids? Juniper Business Use Only From: Rajesh M Sent: Monday, September 14, 2020 4:54 PM To: Zafar Ali (zali) ; Ketan Talaulikar (ketant) ; Pablo Camarillo (pcamaril) Cc: G. Sri Karthik Goud ; SPRING WG = ; Deepti Rathi Subject: RE: SRV6 OAM (USP SID) Please respond. Juniper Business Use Only From: spring > On B= ehalf Of Rajesh M Sent: Monday, September 14, 2020 3:06 PM To: Zafar Ali (zali) >; Ketan Talauli= kar (ketant) >; Pablo Camarillo (= pcamaril) > Cc: G. Sri Karthik Goud >= ; SPRING WG >; Deepti Rathi > Subject: [spring] SRV6 OAM (USP SID) [External Email. Be cautious of content] When ingress pings a USP SID, at the egress below code is executed. 4.16.2. USP: Ultimate S= egment Pop of the SRH The SRH processing of the End, End.X and End.T behaviors are modified: the instructions S02-S04 are substituted by the following ones: S02. If (Segments Left =3D=3D 0) { S03.1. Update the Next Header field in the preceding header to the Next Header value of the SRH S03.2. Decrease the IPv6 header Payload Length by the Hdr Ext Len value of the SRH S03.3. Remove the SRH from the IPv6 extension header chain S03.4. Proceed to process the next header in the packet S04. } May be we should explicitly state here "if next header is Upper layer heade= r then execute section 4.1.1" Juniper Business Use Only --_000_BYAPR05MB57187A0F92A24EAE365F3991D5200BYAPR05MB5718namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Reframing the question:

     

    • Does the draft(oam/network programming) talk about supporting OAM fun= ctionality for END/END.X sids with USP/PSP flag set?
    • If it does, can you please point out to the relevant = portion? Why isn’t it explicitly stated like it is for USD and other = END.D* Sids?

     

     

    Juniper Business Use Only

    From: Rajesh M <mrajesh@juniper.net> Sent: Monday, September 14, 2020 4:54 PM
    To: Zafar Ali (zali) <zali@cisco.com>; Ketan Talaulikar (ketan= t) <ketant@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.= com>
    Cc: G. Sri Karthik Goud <gkarthik@juniper.net>; SPRING WG <= spring@ietf.org>; Deepti Rathi <deeptir@juniper.net>
    Subject: RE: SRV6 OAM (USP SID)

     

    Please respond.

     

     

     

    Juniper Business Use Only

    From: spring <spring-bounces@ietf.org> On Behalf Of Rajesh M
    Sent: Monday, September 14, 2020 3:06 PM
    To: Zafar Ali (zali) <zali@cisc= o.com>; Ketan Talaulikar (ketant) <ketant@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
    Cc: G. Sri Karthik Goud <= gkarthik@juniper.net>; SPRING WG <spring@ietf.org>; Deepti Rathi <deeptir@juniper.net>
    Subject: [spring] SRV6 OAM (USP SID)

     

    <= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

     

    When ingress pings a USP SID, at the egress below co= de is executed.

     

    4.16.2.  USP: Ultimate Segment Pop of the SRH

     
       The SRH processing of the End, End.X and End.T behaviors =
are
       modified: the instructions S02-S04 are substituted by the=
 following
       ones:
     
     S02.     If (Segments Left =3D=3D 0) {=

     S03.1.      Upd=
ate the Next Header field in the preceding header to the<=
/b>
           &nbs=
p;        Next Header value of the =
SRH
     S03.2.      Decrease the IPv6 header Payload=
 Length by the Hdr Ext Len
               &nbs=
p;    value of the SRH
     S03.3.      Remove the SRH from the IPv6 ext=
ension header chain
     S03.4.      Pro=
ceed to process the next header in the packet
     S04.     }

     

     

    May be we should explic= itly state here “if next header is Upper layer header then execute se= ction 4.1.1”

     

     

    Juniper Business Use Only

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Sri Karthik Goud" , Deepti Rathi , SPRING WG Thread-Topic: SRV6 OAM (USP SID) Thread-Index: AdaKemmq5NpsAtGzTPS1g8PV0XHmqwAaIXcAAAlU/kA= Date: Tue, 15 Sep 2020 02:33:00 +0000 Message-ID: References: <33B1531E-55D6-449D-B5DC-09B289221ECE@cisco.com> In-Reply-To: <33B1531E-55D6-449D-B5DC-09B289221ECE@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.5.0.60 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2020-09-15T02:32:56Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=9e98ea42-51ef-4769-aec1-cafc4842c800; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=2 authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=juniper.net; x-originating-ip: [122.167.92.78] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 41af747c-183c-4951-fb8e-08d8591faa05 x-ms-traffictypediagnostic: MN2PR05MB6077: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: /MpBRbadj4oJUfEB7xymCypH1zl9WgO/XFISu+oOqmH764M8aRB06aXERxiyOzXr0SmUTiSrPCNnDEfKa6X1864hCgOFltCR1bhVxf4wGHxw2bd8HRTMbw6GQ7AAj4XTYXBfhD1UJGt06SWZnFNwYFnBfCzB1g/PbtB8dyMnsGA0mZ4fvQY+3eTrjRO+JiZ1yDzmV46mcePKELX1K9/RvOMB069a/wf9Lo5LqjAF6zup+e97b8yr8aSjJr5cKlXkwPuTrRQK9bZIViLmQ22q3zY0CxMxSsaJnYEUzc/QpF4oB3T07Fx095QFIbyQ85tz+e9Ac3Mjx2ol4riwfV1a8E9fPjUeT8IT44KtYoeKftjrkLKp/2komqrnPCdmk3PB+h4t9mR3SlZWVHtLeIITzw== x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR05MB6080.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(346002)(396003)(136003)(39860400002)(366004)(376002)(26005)(76116006)(66446008)(66556008)(64756008)(55016002)(52536014)(8676002)(66946007)(186003)(5660300002)(66476007)(71200400001)(9686003)(86362001)(53546011)(83380400001)(8936002)(33656002)(316002)(7696005)(110136005)(478600001)(54906003)(2906002)(166002)(4326008)(6506007); DIR:OUT; SFP:1102; x-ms-exchange-antispam-messagedata: OafFjGzD97LnEOImebDnseEL8Wja+xCrlyOpMmApw5GY2w1e0RFpDnZh0OuQvuwn1R7QSbIHWegx+HgWG0sR7t9esUucMY0r0FFyMNsfdfauNuFMO+eRH6zE5/LJVg8I3tztuq3YeDcT9XsKInVrJIOaJC8/9B2zTtS0L4yQ8WoriYoNpJtWCw4q+t9f1D23VdpA5MZbf2u7bTwAU5gt4/lhh88idq15LqGam2Fx9kCVCS+CeShqlSEN6rNMfFiDdda79aZekBH28Y+h2Tb6DUPX/Ocwg+wbdkkQ8iehvZkvD0z2RKZrC05fgENi7oGYTTN3IisNYA9kyxZCXnE9oyiygZAGozZ/adU1octuNdvlrSrIG50X3yLstR+RNy1MJNI5InKVUNExK39SRcaDFOoGyVOCWAPpuFnFFwIAQijMCfKxguMdG5KTOHlp7CjQiS9JsuYapLbCF/UawOtMzK9irJRGkEjvUDQ8oEb7h1XjJYDnv/0Q2R/VYrxfk08l1QIj6HCdpX/2JcPAqUr5AimrItQ1FYQq0ujveSRjCUQVZFHNuQQmPlLqH74f7fbD5cnP/4cGoarlNAhNq9GnadYdqhSPj1zLW274JsXth0bPNDer1Px+oLw7xxfk/qcTXpgumBfg46GV7bYbGaD7KA== Content-Type: multipart/alternative; boundary="_000_MN2PR05MB6080452EFA230AB950218E11BE200MN2PR05MB6080namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB6080.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 41af747c-183c-4951-fb8e-08d8591faa05 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Sep 2020 02:33:00.3262 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Lj2mM7DIymr2cnJ638fB7KEBvbyI9il5+AvP8jqpDTuPGcQvR5SP2dpbzJTD/Ep+xlyqiqGJcMSWMTtTbg9FuA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB6077 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-15_03:2020-09-14, 2020-09-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 bulkscore=0 adultscore=0 clxscore=1015 malwarescore=0 phishscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009150020 Archived-At: Subject: Re: [spring] SRV6 OAM (USP SID) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 02:33:06 -0000 --_000_MN2PR05MB6080452EFA230AB950218E11BE200MN2PR05MB6080namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks Zafar. Got the clarification. Juniper Business Use Only From: Zafar Ali (zali) Sent: Tuesday, September 15, 2020 7:34 AM To: Rajesh M ; Ketan Talaulikar (ketant) ; Pablo Camarillo (pcamaril) Cc: G. Sri Karthik Goud ; Deepti Rathi ; SPRING WG ; Zafar Ali (zali) Subject: Re: SRV6 OAM (USP SID) [External Email. Be cautious of content] Hi Rajesh, The extension header chain is processed as defined in RFC8200. If you get t= o the upper layer header, it is indeed processed as per section 4.1.1. This is no different than any other behavior, hence there is no reason to c= all this out explicitly on this one and not the others. Thanks Regards ... Zafar From: Rajesh M > Date: Monday, September 14, 2020 at 5:36 AM To: "Zafar Ali (zali)" >, "Ketan Tala= ulikar (ketant)" >, "Pablo Camari= llo (pcamaril)" > Cc: "G. Sri Karthik Goud" >, Deepti Rathi >, SPRING = WG > Subject: SRV6 OAM (USP SID) When ingress pings a USP SID, at the egress below code is executed. 4.16.2. USP: Ultimate S= egment Pop of the SRH The SRH processing of the End, End.X and End.T behaviors are modified: the instructions S02-S04 are substituted by the following ones: S02. If (Segments Left =3D=3D 0) { S03.1. Update the Next Header field in the preceding header to the Next Header value of the SRH S03.2. Decrease the IPv6 header Payload Length by the Hdr Ext Len value of the SRH S03.3. Remove the SRH from the IPv6 extension header chain S03.4. Proceed to process the next header in the packet S04. } May be we should explicitly state here "if next header is Upper layer heade= r then execute section 4.1.1" Juniper Business Use Only --_000_MN2PR05MB6080452EFA230AB950218E11BE200MN2PR05MB6080namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Thanks Zafar. Got the clarification.

     

     

    Juniper Business Use Only

    From: Zafar Ali (zali) <zali@cisco.com>=
    Sent: Tuesday, September 15, 2020 7:34 AM
    To: Rajesh M <mrajesh@juniper.net>; Ketan Talaulikar (ketant) = <ketant@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com= >
    Cc: G. Sri Karthik Goud <gkarthik@juniper.net>; Deepti Rathi &= lt;deeptir@juniper.net>; SPRING WG <spring@ietf.org>; Zafar Ali (z= ali) <zali@cisco.com>
    Subject: Re: SRV6 OAM (USP SID)

     

    <= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

     

    Hi Rajesh,

     =

    The extension header chain = is processed as defined in RFC8200. If you get to the upper layer header, i= t is indeed processed as per section 4.1.1.=

    This is no different than a= ny other behavior, hence there is no reason to call this out explicitly on = this one and not the others.

     =

    Thanks=

     =

    Regards … Zafar

     

    From= : Rajesh M <mrajesh@juniper.net>
    Date: Monday, September 14, 2020 at 5:36 AM
    To: "Zafar Ali (zali)" <zali@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Pablo Camaril= lo (pcamaril)" <pcamaril@cisc= o.com>
    Cc: "G. Sri Karthik Goud" <gkarthik@juniper.net>, Deepti Rathi <deeptir@juniper.net>, SPRING WG <spring@ietf.org>
    Subject: SRV6 OAM (USP SID)

     

    When ingress pings a USP SID, at the egress below co= de is executed.

     

    4.16.2.  USP: Ultimate Segment Pop of the SRH

     
       The SRH processing of the End, End.X and End.T behaviors =
are
       modified: the instructions S02-S04 are substituted by the=
 following
       ones:
     
     S02.     If (Segments Left =3D=3D 0) {=

     S03.1.      Upd=
ate the Next Header field in the preceding header to the
           &nbs=
p;        Next Header value of the =
SRH
     S03.2.      Decrease the IPv6 header Payload=
 Length by the Hdr Ext Len
               &nbs=
p;    value of the SRH
     S03.3.      Remove the SRH from the IPv6 ext=
ension header chain
     S03.4.      Pro=
ceed to process the next header in the packet
     S04.     }

     

     

    May be we should explic= itly state here “if next header is Upper layer header then execute se= ction 4.1.1”

     

     

    Juniper Business Use Only

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ZXhwbGFpbiBvbiB0aGUgbGlzdC4mbmJzcDsgU2lsZW5jZSBkb2VzPGJyPm5vdCBtZWFuIGNvbnNl bnQuPGJyPjxicj5Zb3Vycyw8YnI+Sm9lbCBNLiBIYWxwZXJuPGJyPjxicj48L2Jsb2NrcXVvdGU+ PC9kaXY+PC9kaXY+PC9kaXY+PC9kaXY+PC9kaXY+PC9kaXY+PC9kaXY+PHA+PGJyPjwvcD48L2Rp dj4= --=====_003_next=====-- --=====_002_next=====-- --=====_001_next=====-- From nobody Tue Sep 15 10:28:17 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 88D983A14A1; Tue, 15 Sep 2020 10:28:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ljtn4raHOCrU; Tue, 15 Sep 2020 10:28:15 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 59EAA3A149F; Tue, 15 Sep 2020 10:28:15 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 4BrVYq0tGNz6GQt5; Tue, 15 Sep 2020 10:28:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1600190895; bh=RXAPQhdqBy6Oyld3RQhLKDZCkVqEQ4cN5xQt3r84uXk=; h=Subject:References:To:From:Date:In-Reply-To:From; b=IFqIsG+iMTnP114o86rAbF6q5HWI0fpUgkJ16qFksB+FNGxCsr6ckx5+Vk+wvC2OU ies4GYQmANBAt0zZQvLzOj4+vXO4G/wNE+jgr/t3XlXsN9hNv/VO3W4gRuR3Wrz4T1 4LDelo3cB7poMso0Kws+6jtjVtAjJ8goZfNUmA0c= X-Quarantine-ID: X-Virus-Scanned: Debian amavisd-new at a2.tigertech.net Received: from [192.168.128.43] (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 4BrVYp3x7qz6GJFc; Tue, 15 Sep 2020 10:28:14 -0700 (PDT) References: <160019028050.27933.9283688980670330700@ietfa.amsl.com> To: "lisp@ietf.org" , "sfc@ietf.org" , "spring@ietf.org" From: Joel Halpern X-Forwarded-Message-Id: <160019028050.27933.9283688980670330700@ietfa.amsl.com> Message-ID: Date: Tue, 15 Sep 2020 13:28:13 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <160019028050.27933.9283688980670330700@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: [spring] Fwd: NomCom 2020: Second Call for nominations X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 17:28:17 -0000 -------- Forwarded Message -------- Subject: NomCom 2020: Second Call for nominations Date: Tue, 15 Sep 2020 10:18:00 -0700 From: NomCom Chair 2020 To: IETF Announcement List CC: ietf@ietf.org Hi IETF, It's been brought to my attention that my formal NomCom announcements are boring and few people read them. I blame my predecessor NomCom chairs, whom I have freely plagiarized. To try something new, I've created this email all by myself. This is my 2nd email asking for nominations for IESG, IAB, LLC, and IETF Trust positions. I won't repeat all the things said in the first call. If you want to read it, it's here: https://mailarchive.ietf.org/arch/msg/ietf-announce/epfapZaDMv48eb7j_6q68YYXPYc/ To see who has currently accepted nominations for positions, go to: https://datatracker.ietf.org/nomcom/2020/nominate/ If you take a look at this page, you'll see there are no accepted nominations for Transport AD, and only 1 each for Ops AD and IETF Chair. While the listed Ops AD and Chair nominees are decidedly wonderful people, it's very difficult for NomCom to have heated argument and debate under such conditions. A complete absence of nominees is even more challenging. Please help us rectify this situation. Below is a list of people currently in the open positions, with an asterisk next to the names of people who have stated they will not run for that position this year. You'll note there are several people without an asterisk but not on the list of people who have accepted a nomination. That's ok. For now. Since we're all experts at quantum computing (right?), we should have no problem with this. This state of principled uncertainty *will* end by the October 13 deadline, when all who wish to be considered MUST have provided acceptance and a questionnaire response. LLC Board (3-year term) Maja Andjelkovic IETF Trust (3-year term) Joel Halpern IAB (2-year term) Jari Arkko Jeff Tantsura Mark Nottingham * Stephen Farrell Wes Hardaker Zhenbin Li IESG (2-year term) Alissa Cooper, IETF Chair/GEN AD * Alvaro Retana, RTG AD Barry Leiba, ART AD * Deborah Brungard, RTG AD Éric Vyncke, INT AD Magnus Westerlund, TSV AD * Roman Danyliw, SEC AD Warren Kumari, OPS AD Barbara IETF NomCom Chair 2020-2021 Barbara Stark nomcom-chair-2020 at ietf dot org _______________________________________________ IETF-Announce mailing list IETF-Announce@ietf.org https://www.ietf.org/mailman/listinfo/ietf-announce From nobody Tue Sep 15 22:51:40 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B46DA3A0CF4; Tue, 15 Sep 2020 22:51:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.62 X-Spam-Level: X-Spam-Status: 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b3VsZCBhbnkgcGFydCBvZiB0aGUgcHJlZml4IGJlaW5nIHVzZWQgZm9yIFNJRHMgYmUgYWR2ZXJ0 aXNlZCB0byBleHRlcm5hbA0KICAgIHBlZXJzL25ldHdvcmtzPw0KDQoNCg0KICAgIF9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fDQogICAgSW50LWRpciBtYWls aW5nIGxpc3QNCiAgICBJbnQtZGlyQGlldGYub3JnDQogICAgaHR0cHM6Ly93d3cuaWV0Zi5vcmcv bWFpbG1hbi9saXN0aW5mby9pbnQtZGlyDQoNCg== From nobody Wed Sep 16 07:43:17 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 32F743A03EE for ; Wed, 16 Sep 2020 07:43:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.698 X-Spam-Level: X-Spam-Status: No, score=-1.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, NICE_REPLY_A=-0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (public key: not available)" header.d=lab.dtag.de Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9FI8a61-XuC0 for ; Wed, 16 Sep 2020 07:43:12 -0700 (PDT) Received: from OldBailey.lab.dtag.de (OldBailey.lab.DTAG.DE [194.25.1.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7AA053A0AC6 for ; Wed, 16 Sep 2020 07:42:14 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 640B3C1211; Wed, 16 Sep 2020 16:42:01 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lab.dtag.de; s=dkim; t=1600267324; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=GN4GzQh2s9ONirvOmpFTK8of2WZyuBYHJBZlBAv2abQ=; b=VhwuC9zCVkaAHYWWjRFSb+q98v0nI7KLpi+FMzCtQYZwc+xjIXYRnz/GH+i/p9x73fzjiV Wy/eh52JnKFbTmMoj8q7532WwJZ+sg9MNb1q3G3qhx7gYoahkGRFxi1phL9zgAMl8BpGSK wGJjjtuBOinDlRUeeWJvuWcTmBvFYaSIwbbm7x3FGmgRyLVqK7y9Jv6VEqK5vAUGzbdKA3 p8tbkiO66hcl79AgfPisKV16Tkk3M4RxzLLhXstOf3i7c8hiM1BmiHtufb0G/Av5b0hoQt lodXlucPbH52lOu7ZJmMNW5bxWgXxWDZq0pNCsdNRieMWwLbs4VqCLJpOSnmtQ== To: Jeff Tantsura Cc: bruno.decraene@orange.com, "spring@ietf.org" References: <22402_1599234564_5F526204_22402_314_1_53C29892C857584299CBF5D05346208A48F58F00@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <799904D5-864B-4D86-958F-4588F64F464A@gmail.com> From: Martin Horneffer Message-ID: <152e1cc0-f91f-a5e9-09db-5d81b3c1975e@lab.dtag.de> Date: Wed, 16 Sep 2020 16:41:56 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <799904D5-864B-4D86-958F-4588F64F464A@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Archived-At: Subject: Re: [spring] to drop or to forward unlabelled (Re: Question on RFC8660) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Sep 2020 14:43:15 -0000 Hi Jeff, actually the paragraph just before "Otherwise, drop the packet" reads: * Else, if there are other usable next hops, use them to forward the incoming packet. The method by which the router "R0" decides on the possibility of using other next hops is beyond the scope of this document. For example, the MCC on "R0" may chose the send an IPv4 packet without pushing any label to another next hop. To me this doesn't really make clear which behaviour is expected. As Jakob suggested, it depends on the exact understanding of "usable next hops". In my opinion a plain IGP next hop is usable. At least for the BoS case, if you want to look at it. Best regards, Martin Am 09.09.20 um 10:38 schrieb Jeff Tantsura: > I’m with Bruno here, and the spec is quite clear on the behavior expected (implementors, please speak up). > Given variability and interdependencies in use cases, I’d say, drop should be (and de-jure it is) the default behavior, and if someone wants their vendor of choice to implement a knob to change that - they are free to do so (local behavior) as long as consequences are well understood (rope is short). > > Cheers, > Jeff > >> On Sep 4, 2020, at 17:49, bruno.decraene@orange.com wrote: >> >> Hi Martin, >> >>> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Martin >>> Horneffer >>> >>> Hello everyone, >>> >>> may I come back the the question below? Or rather let me update it a little: >>> >>> In case an SR-MPLS path is broken, should a node rather drop the packet, >>> or forward it? >>> >>> This can happen whenever the IGP points to a certain next hop, but that >>> neither supplies a valid SID, nor allows LDP-stitching for whatever >>> reason. For PUSH as well as for CONTINUE. >> Speaking as an individual contributor, my reading of RFC 8660 (SR-MPLS) is that the packet is dropped ("Otherwise, drop the packet"). >> https://www.rfc-editor.org/rfc/rfc8660.html#name-forwarding-for-push-and-con >> >> However that could be seen as a local behavior, hence possibly configurable. >> >> As a network operator, >> - I understand your use case. >> - I equally understand the use case of someone preferring/requiring the packet to be dropped, e.g. in the VPN case where the isolation is the main requirement. >> >> Best regards, >> --Bruno >> >> >>> We have been using MPLS transport and a BGP free core since about two >>> decades now, using LDP. In the analog case, LDP creates "unlabelled" >>> entries in the LFIB, does the equivalent of a POP operation and forwards >>> the packet to the next-hop as chosen by the IGP. >>> >>> This behavior obviously breaks any traffic that relies on a service >>> label, but it can protect some traffic. >>> In our case a huge percentage of all traffic still is public IPv4. This >>> needs MPLS only for a transport label, be it LDP or SR-MPLS. If this >>> traffic gets forwarded unlabelled, it follows an IGP default route to a >>> central device, where it is 1) redirected to the correct destination and >>> 2) counted in a way that operators can quickly see whether and where >>> this kind of failure occurs at some point in the network. >>> >>> After more operational experience and several internal discussions we >>> agreed that we want packets to be forwarded unlabelled rather than >>> dropped. Anyone to share, or oppose this position? >>> >>> Best regards, Martin >>> >>> >>>> Am 31.01.20 um 16:50 schrieb Martin Horneffer: >>>> Hello everyone, >>>> >>>> again it seems the interesting questions only show up when applying >>>> something to the live network... >>>> >>>> We ran into something that poses a question related to RFC8660: What >>>> is the exact meaning of section 2.10.1, "Forwarding for PUSH and >>>> CONTINUE of Global SIDs", when the chosen neighbor doesn't provide a >>>> valid MPLS path? >>>> >>>> The relevant sections reads: >>>> >>>> - Else, if there are other usable next hops, use them to forward >>>> the incoming packet. The method by which the router "R0" >>>> decides on the possibility of using other next hops is beyond >>>> the scope of this document. For example, the MCC on "R0" may >>>> chose the send an IPv4 packet without pushing any label to >>>> another next hop. >>>> >>>> Does the part "send an IPv4 packet without pushing any label" apply to >>>> PUSH and CONTINUE, or just to PUSH? >>>> Does R0 have to validate that neighbor N can correctly process to >>>> packet? Or can it forward the packet regardless? >>>> >>>> The reason for asking is that we are now seeing issues similar to ones >>>> we had when starting with LDP based MPLS about two decades ago: >>>> traffic being black holed even though a path to the destination >>>> exists, because the MPLS path is interrupted somewhere in the middle. >>>> >>>> With LDP we know the case of LFIBentries called "unlabelled". While >>>> this does break connectivity for many kinds of service, e.g. those >>>> relying on an additional service labels, it still works for plain >>>> IP(v4) traffic. In our cases, this works perfectly fine for all >>>> internal routing and control traffic. And even for IPv4 traffic that >>>> gets collected by a central router that injects a default route. >>>> >>>> However, depending on the exact interpretation of the above paragraph, >>>> an implementor might feel obliged to chose the next paragraph: >>>> >>>> - Otherwise, drop the packet. >>>> >>>> Which is, at least in our case, very unfortunate... >>>> >>>> Any advice or opinion appreciated! >>>> >>>> >>>> Best regards, Martin >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> spring mailing list >>>> spring@ietf.org >>>> https://www.ietf.org/mailman/listinfo/spring >>> _______________________________________________ >>> spring mailing list >>> spring@ietf.org >>> https://www.ietf.org/mailman/listinfo/spring >> _________________________________________________________________________________________________________________________ >> >> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc >> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler >> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, >> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. >> >> This message and its attachments may contain confidential or privileged information that may be protected by law; >> they should not be distributed, used or copied without authorisation. >> If you have received this email in error, please notify the sender and delete this message and its attachments. >> As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. >> Thank you. >> >> _______________________________________________ >> spring mailing list >> spring@ietf.org >> https://www.ietf.org/mailman/listinfo/spring From nobody Thu Sep 17 00:31:39 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2B3E3A0D51; Thu, 17 Sep 2020 00:31:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.917 X-Spam-Level: X-Spam-Status: No, score=-1.917 tagged_above=-999 required=5 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IGRpc2N1c3MgdGhlIHVzZSBvZiBTSUQgYXMgYSBzb3VyY2UgYWRkcmVzczsgaG93ZXZlciBJIHNl ZSBubyBzZWN1cml0eSBpc3N1ZSBpZiB0aGV5IGFyZSB1c2VkIHRoYXQgd2F5IC4NCg0KU2hvdWxk IGFueSBwYXJ0IG9mIHRoZSBwcmVmaXggYmVpbmcgdXNlZCBmb3IgU0lEcyBiZSBhZHZlcnRpc2Vk IHRvIGV4dGVybmFsIHBlZXJzL25ldHdvcmtzPw0KW1BDXSBUaGVyZSBpcyBubyByZXF1aXJlbWVu dCB0byBhZHZlcnRpc2UgdGhlIHByZWZpeCBiZWluZyB1c2VkIGZvciBTSURzIHRvIGV4dGVybmFs IHBlZXJzL25ldHdvcmtzIG91dHNpZGUgdGhlIFNSIERvbWFpbi4NCg0KDQoNCg== From nobody Thu Sep 17 23:44:30 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AF1C3A0B9C; Thu, 17 Sep 2020 23:44:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.637 X-Spam-Level: X-Spam-Status: No, score=-1.637 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_FONT_FACE_BAD=0.001, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mdEbpmLjXNp3; Thu, 17 Sep 2020 23:44:25 -0700 (PDT) Received: from cmccmta2.chinamobile.com (cmccmta2.chinamobile.com [221.176.66.80]) by ietfa.amsl.com (Postfix) with ESMTP id CD5493A0B7B; Thu, 17 Sep 2020 23:44:23 -0700 (PDT) Received: from spf.mail.chinamobile.com (unknown[172.16.121.13]) by rmmx-syy-dmz-app05-12005 (RichMail) with SMTP id 2ee55f64573b93b-27383; Fri, 18 Sep 2020 14:44:12 +0800 (CST) X-RM-TRANSID: 2ee55f64573b93b-27383 X-RM-SPAM-FLAG: 00000000 Received: from jiangwenying@chinamobile.com ( [223.69.29.103] ) by ajax-webmail-syy-appsvr07-11007 (Richmail) with HTTP; Fri, 18 Sep 2020 14:44:11 +0800 (CST) Date: Fri, 18 Sep 2020 14:44:11 +0800 (CST) From: =?utf-8?B?5aec5paH6aKW?= To: ietf-secretariat-rep Cc: spring , spring-chairs , draft-mirsky-spring- Message-ID: <2aff5f642eafdfa-000b2.Richmail.00003080965046281547@chinamobile.com> References: 159958851173.6820.10542475922462723282@ietfa.amsl.com, <202009171531290632211@zte.com.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1472645_1583436212.1600411451579" X-Priority: 3 X-RM-TRANSID: 2aff5f642eafdfa-000b2 X-RM-OA-ENC-TYPE: 0 X-RM-FontColor: 0 X-CLIENT-INFO: X-TIMING=0&X-MASSSENT=0&X-SENSITIVE=0 X-Mailer: Richmail_Webapp(V2.2.26) Archived-At: Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state"Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Sep 2020 06:44:28 -0000 ------=_Part_1472645_1583436212.1600411451579 Content-Type: text/plain;charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, I support the adoption. This document provides a good method of the reverse path control for the B= FD in SR-MPLS network, which is very helpful for the deployment of SR-TE te= chnology in the carrier network Regards, Wenying =E7=A5=9D=E5=A5=BD=EF=BC=81 ****************************************************** =E5=A7=9C=E6=96=87=E9=A2=96 =E4=B8=AD=E5=9B=BD=E7=A7=BB=E5=8A=A8=E9=80=9A=E4=BF=A1=E7=A0=94=E7=A9=B6=E9= =99=A2 =E7=BD=91=E7=BB=9C=E6=8A=80=E6=9C=AF=E7=A0=94=E7=A9=B6=E6=89=80 =E5=9C=B0=E5=9D=80=EF=BC=9A=E5=8C=97=E4=BA=AC=E5=B8=82=E8=A5=BF=E5=9F=8E=E5= =8C=BA=E5=AE=A3=E6=AD=A6=E9=97=A8=E8=A5=BF=E5=A4=A7=E8=A1=9732=E5=8F=B7=EF= =BC=88100053=EF=BC=89 Email=EF=BC=9Ajiangwenying@chinamobile.com =E7=94=B5=E8=AF=9D=EF=BC=9A15801696688-34257=EF=BC=8C13810389325 ****************************************************** ----=E9=82=AE=E4=BB=B6=E5=8E=9F=E6=96=87----=E5=8F=91=E4=BB=B6=E4=BA=BA=EF= =BC=9A"peng.shaofu" =E6=94=B6=E4=BB=B6=E4=BA=BA=EF= =BC=9Aietf-secretariat-reply =E6=8A=84=E3= =80=80=E9=80=81: spring ,spring-chairs ,draft-mirsky-spring-bfd =E5=8F=91= =E9=80=81=E6=97=B6=E9=97=B4=EF=BC=9A2020-09-17 15:31:29=E4=B8=BB=E9=A2=98= =EF=BC=9ARe:[spring] The SPRING WG has placed draft-mirsky-spring-bfd in st= ate"Call For Adoption By WG Issued" Hi, I support the adoption. This document enables a more flexible control of the reverse path for the B= FD in SR-MPLS network, provides the solution to the problems that we are f= aced in the actual network deployment. Regards, PSF =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AIETFSecretariat =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aspring@ietf.org spring= -chairs@ietf.org draft-mirsky-spring-bfd@ietf.org <= draft-mirsky-spring-bfd@ietf.org> =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B409=E6=9C=8809=E6=97=A5 02:08 =E4=B8=BB =E9=A2=98 =EF=BC=9A[spring] The SPRING WG has placed draft-mirsky= -spring-bfd in state"Call For Adoption By WG Issued" The SPRING WG has placed draft-mirsky-spring-bfd in stateCall For Adoption = By WG Issued (entered by Joel Halpern)The document is available athttps://d= atatracker.ietf.org/doc/draft-mirsky-spring-bfd/Comment:The authors have re= quested (quite some time ago) WG adoption for thisdocument. Looking at the= archive, there was anot a lot of discussion, andsome concerns. Rather tha= n try to infer the current state from the olddiscussions, the WG Chairs hav= e decided to issue a WG call for adoption. Ifyou support this becoming a W= G document, please explain on the list. If youoppose this becoming a WG do= cument, please explain on the list. Silence doesnot mean consent.Yours,Joe= l M. Halpern_______________________________________________spring mailing l= istspring@ietf.orghttps://www.ietf.org/mailman/listinfo/spring ------=_Part_1472645_1583436212.1600411451579 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable

    Hi,

    <= br/>

    I support the ado= ption.

    This document provides a good me= thod  of the reverse path control for the BFD in SR-MPLS network<= span class=3D"high-light-bg">, which is very helpful for the deployment of = SR-TE technology in the carrier network


    Regards,

    Wenying


    =

    =E7=A5=9D=E5=A5=BD=EF= =BC=81

    ***************= ***************************************

    =E5=A7=9C=E6=96=87=E9=A2=96

    = =E4=B8=AD=E5=9B=BD=E7= =A7=BB=E5=8A=A8=E9=80=9A=E4=BF=A1=E7=A0=94=E7=A9=B6=E9=99=A2 =E7=BD=91=E7= =BB=9C=E6=8A=80=E6=9C=AF=E7=A0=94=E7=A9=B6=E6=89=80

    =E5=9C=B0=E5=9D=80=EF=BC=9A=E5= =8C=97=E4=BA=AC=E5=B8=82=E8=A5=BF=E5=9F=8E=E5=8C=BA=E5=AE=A3=E6=AD=A6=E9=97= =A8=E8=A5=BF=E5=A4=A7=E8=A1=9732=E5=8F=B7=EF=BC= =88100053=EF=BC=89

    Email=EF=BC=9Ajiangwenying@chinamobile.com

    =E7=94= =B5=E8=AF=9D=EF=BC=9A15801696688-34257=EF=BC=8C= 13810389325

    **************************= ****************************



    =

    ----=E9=82=AE=E4=BB=B6=E5=8E= =9F=E6=96=87----
    =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A&= quot;peng.shaofu" <peng.shaofu@zte.com.cn>
    =E6= =94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aietf-secretariat-reply <i= etf-secretariat-reply@ietf.org>
    =E6=8A=84=E3=80=80=E9=80=81:= spring <spring@ietf.org>,spring-chairs <spring= -chairs@ietf.org>,draft-mirsky-spring-bfd <draft-mirsky-spring-b= fd@ietf.org>
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4=EF=BC=9A2020-09-17 15:31:29
    =E4=B8=BB=E9=A2=98=EF=BC=9A= Re:[spring] The SPRING WG has placed draft-mi= rsky-spring-bfd in state"Call For Adoption By=  WG Issued"


    Hi,


    I suppo= rt the adoption.

    This = document enables a more flexible control of the reverse path for the BFD in= SR-MPLS network,  provides the solution to the problems that we = are faced in the actual network deployment.


    Regards,

    PSF

    =


    =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
    =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AIETFSecretariat <ietf-secretariat-reply@ietf.o= rg>
    =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aspring@ietf.org = <spring@ietf.org>;spring-chairs@ietf.org <spring-chairs@ietf.org>;<= span class=3D"zreadUserName" style=3D"display: inline;">draft-mirsky-spring= -bfd@ietf.org <draft-mirsky-spring-bfd@ietf.org>;
    =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B409=E6=9C=8809=E6= =97=A5 02:08
    =E4=B8=BB =E9=A2=98 =EF=BC=9A[spring] The SPRING WG has placed draft-mirsky= -spring-bfd in state"Call For Adoption By WG Issued"

    The SPRING&nbs= p;WG has placed draft-mirsky-spring-bfd in stateCall For Adoption By WG Issued (entered&nb= sp;by Joel Halpern)

    The document is avail= able at
    https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/<= br/>
    Comment:
    The authors have requested (quite=  some time ago) WG adoption for this
    document.  Looking at the archive, there&nbs= p;was anot a lot of discussion, and
    some&= nbsp;concerns.  Rather than try to infer = ;the current state from the old
    discussions,&n= bsp;the WG Chairs have decided to issue = a WG call for adoption.  If
    you supp= ort this becoming a WG document, please = explain on the list.  If you
    oppose = this becoming a WG document, please explain&n= bsp;on the list.  Silence does
    not mean&n= bsp;consent.

    Yours,
    Joel M. Halpern

    _______= ________________________________________
    spring mailing list<= br/>spring@ietf.org
    https://www.ietf.org/mailman/listinfo/spring
    <= /div>


    ------=_Part_1472645_1583436212.1600411451579-- From nobody Thu Sep 17 23:59:41 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 15BBE3A0B72; Thu, 17 Sep 2020 23:23:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.638 X-Spam-Level: X-Spam-Status: No, score=-1.638 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id I_y6rgmo6IX3; Thu, 17 Sep 2020 23:23:32 -0700 (PDT) Received: from cmccmta1.chinamobile.com (cmccmta1.chinamobile.com [221.176.66.79]) by ietfa.amsl.com (Postfix) with ESMTP id 918843A0B6E; Thu, 17 Sep 2020 23:23:30 -0700 (PDT) Received: from spf.mail.chinamobile.com (unknown[172.16.121.13]) by rmmx-syy-dmz-app03-12003 (RichMail) with SMTP id 2ee35f645253a76-2465b; Fri, 18 Sep 2020 14:23:17 +0800 (CST) X-RM-TRANSID: 2ee35f645253a76-2465b X-RM-SPAM-FLAG: 00000000 Received: from jiangwenying@chinamobile.com ( [223.69.29.103] ) by ajax-webmail-syy-appsvr07-11007 (Richmail) with HTTP; Fri, 18 Sep 2020 14:23:17 +0800 (CST) Date: Fri, 18 Sep 2020 14:23:17 +0800 (CST) From: =?utf-8?B?5aec5paH6aKW?= To: ietf-secretariat-rep Cc: spring , spring-chairs , draft-mirsky-spring- Message-ID: <2aff5f642eafdfa-0008a.Richmail.00006020169036380547@chinamobile.com> References: 159958851173.6820.10542475922462723282@ietfa.amsl.com, <202009171531290632211@zte.com.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1469323_2075369703.1600410197232" X-Priority: 3 X-RM-TRANSID: 2aff5f642eafdfa-0008a X-RM-OA-ENC-TYPE: 0 X-RM-FontColor: 0 X-CLIENT-INFO: X-TIMING=0&X-MASSSENT=0&X-SENSITIVE=0 X-Mailer: Richmail_Webapp(V2.2.26) Archived-At: X-Mailman-Approved-At: Thu, 17 Sep 2020 23:59:41 -0700 Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state"Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Sep 2020 06:23:36 -0000 ------=_Part_1469323_2075369703.1600410197232 Content-Type: text/plain;charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, =20 I support the adoption. This document provides a good method of the reverse path control for the B= FD in SR-MPLS network, which is very helpful for the deployment of SR-TE te= chnology in the carrier network Regards, Wenying ****************************************************** =E5=A7=9C=E6=96=87=E9=A2=96 =E4=B8=AD=E5=9B=BD=E7=A7=BB=E5=8A=A8=E9=80=9A=E4=BF=A1=E7=A0=94=E7=A9=B6=E9= =99=A2 =E7=BD=91=E7=BB=9C=E6=8A=80=E6=9C=AF=E7=A0=94=E7=A9=B6=E6=89=80 =E5=9C=B0=E5=9D=80=EF=BC=9A=E5=8C=97=E4=BA=AC=E5=B8=82=E8=A5=BF=E5=9F=8E=E5= =8C=BA=E5=AE=A3=E6=AD=A6=E9=97=A8=E8=A5=BF=E5=A4=A7=E8=A1=9732=E5=8F=B7=EF= =BC=88100053=EF=BC=89 Email=EF=BC=9Ajiangwenying@chinamobile.com =E7=94=B5=E8=AF=9D=EF=BC=9A15801696688-34257=EF=BC=8C13810389325 ****************************************************** =20 =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AIETFSecretariat =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aspring@ietf.org spring= -chairs@ietf.org draft-mirsky-spring-bfd@ietf.org <= draft-mirsky-spring-bfd@ietf.org> =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B409=E6=9C=8809=E6=97=A5 02:08 =E4=B8=BB =E9=A2=98 =EF=BC=9A[spring] The SPRING WG has placed draft-mirsky= -spring-bfd in state"Call For Adoption By WG Issued" The SPRING WG has placed draft-mirsky-spring-bfd in stateCall For Adoption = By WG Issued (entered by Joel Halpern)The document is available athttps://d= atatracker.ietf.org/doc/draft-mirsky-spring-bfd/Comment:The authors have re= quested (quite some time ago) WG adoption for thisdocument. Looking at the= archive, there was anot a lot of discussion, andsome concerns. Rather tha= n try to infer the current state from the olddiscussions, the WG Chairs hav= e decided to issue a WG call for adoption. Ifyou support this becoming a W= G document, please explain on the list. If youoppose this becoming a WG do= cument, please explain on the list. Silence doesnot mean consent.Yours,Joe= l M. Halpern_______________________________________________spring mailing l= istspring@ietf.orghttps://www.ietf.org/mailman/listinfo/spring =20 ------=_Part_1469323_2075369703.1600410197232 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable

    Hi,

    I support the= adoption.

    This document provides a good method  of th= e reverse path control for the BFD in SR-MPLS network, which is very h= elpful for the deployment of SR-TE technology in the carrier network=


    Regards,

    Wenying


    ******************************************************

    =E4=B8=AD=E5=9B=BD=E7=A7=BB=E5=8A=A8= =E9=80=9A=E4=BF=A1=E7=A0=94=E7=A9=B6=E9=99=A2 =E7=BD=91=E7=BB=9C=E6=8A=80= =E6=9C=AF=E7=A0=94=E7=A9=B6=E6=89=80

    =E5=9C=B0=E5=9D=80=EF=BC=9A=E5= =8C=97=E4=BA=AC=E5=B8=82=E8=A5=BF=E5=9F=8E=E5=8C=BA=E5=AE=A3=E6=AD=A6=E9=97= =A8=E8=A5=BF=E5=A4=A7=E8=A1=9732=E5=8F=B7=EF=BC= =88100053=EF=BC=89

    Email=EF=BC=9Ajiangwenying@chinamobile.= com

    =E7=94=B5=E8=AF=9D=EF=BC=9A15801696688-34257=EF=BC=8C13810389325

    ******************************************************

     

    = =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
    = =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A= IETFSecretariat <ietf-secretariat-reply@ietf.org>
    =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aspring@ietf.org <spring@ietf.org>;spring-chairs= @ietf.org <spring-chairs@ietf.org>;draft-mirsky-spring-bfd@ietf.org <draft-mi= rsky-spring-bfd@ietf.org>;
    =E6=97=A5 =E6=9C=9F = =EF=BC=9A2020=E5=B9=B409=E6=9C=8809=E6=97=A5 02:08
    =E4=B8=BB =E9=A2=98 =EF=BC=9A[spring] The SPRING WG has placed draft-mirsky-spring-bfd in state"Ca= ll For Adoption By WG Issued"

    The SPRING WG has placed&nb= sp;draft-mirsky-spring-bfd in state
    Call For Adopti= on By WG Issued (entered by Joel Halpern= )

    The document is available at
    https://dat= atracker.ietf.org/doc/draft-mirsky-spring-bfd/

    Comment:
    The&nb= sp;authors have requested (quite some time ag= o) WG adoption for this
    document.  Lookin= g at the archive, there was anot a = lot of discussion, and
    some concerns.  Ra= ther than try to infer the current state=  from the old
    discussions, the WG Chairs&= nbsp;have decided to issue a WG call for=  adoption.  If
    you support this becoming&= nbsp;a WG document, please explain on the&nbs= p;list.  If you
    oppose this becoming a&nb= sp;WG document, please explain on the list.&n= bsp; Silence does
    not mean consent.

    Yours,=
    Joel M. Halpern

    ___________________________________= ____________
    spring mailing list
    spring@ietf.org
    http= s://www.ietf.org/mailman/listinfo/spring

      ------=_Part_1469323_2075369703.1600410197232-- From nobody Fri Sep 18 08:56:45 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 834F93A0FF0; Fri, 18 Sep 2020 08:56:44 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160044460449.22443.18008787285553768570@ietfa.amsl.com> Date: Fri, 18 Sep 2020 08:56:44 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Sep 2020 15:56:45 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-19.txt Pages : 42 Date : 2020-09-18 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization (Service Level Agreements). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-19 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-19 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-19 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Sep 18 09:08:37 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9BA763A1004; Fri, 18 Sep 2020 09:08:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.62 X-Spam-Level: X-Spam-Status: No, score=-9.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=YkNAzyrT; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=qL9o0Ep6 Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jyReT9yTZcRX; 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Fri, 18 Sep 2020 16:08:15 +0000 From: "Pablo Camarillo (pcamaril)" To: "last-call@ietf.org" CC: The IESG , "spring@ietf.org" Thread-Topic: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19.txt Thread-Index: AQHWjdRtUAU1RsvVNkKoRE5DqgOvwaluj6BQ Date: Fri, 18 Sep 2020 16:08:15 +0000 Message-ID: References: <160044460449.22443.18008787285553768570@ietfa.amsl.com> In-Reply-To: <160044460449.22443.18008787285553768570@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=cisco.com; x-originating-ip: [79.144.207.121] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f666960c-c93e-49f8-01b7-08d85bed0cf8 x-ms-traffictypediagnostic: MW3PR11MB4601: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: uPx0qWhlhLNthGH3icH9OXv9czkvPfLfTWjAPkT8UCNSftIlFee7anD5w4BIBKONhIy5rJLGN9C18og6kaYKf+S6PdAbzQvFRa0AjvWGplO1JcsmgZNMMAltN012cByx5M+8L017mPeyo0BXn6v10P2S9C0IP26VSNIygtm118nW7n09zvEpzaRGzsXJ2dlmySAUdwFadnOr/6JMIB6UPg5P5kjzdVfnFIfwDi0iijH24gRsEYUfQRNPMyu0NTsRnW/AnomE76w9T4M7kgWMyDxvEypWnAwyqnEXq2RYBW+VvHJ92W8OHyYFYmj+iSDFjvKcB1UwuOy+I2X+GA6BfgQOAKKZmYi0plOvXZQvp9slmksfFZk8Otqk6NxbsEa9AImJ41Yhhj51H7nq73XpbQ== x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR11MB1374.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f666960c-c93e-49f8-01b7-08d85bed0cf8 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Sep 2020 16:08:15.4792 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: BQY4e+c9IEb3y+belt9/DmEAoLebggoWf6S+Lg5xLRHND5qBZ+5uekeiRIIXbOhb5ISkkRSWtU8YVtlMxDMGvA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4601 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.15, xch-aln-005.cisco.com X-Outbound-Node: rcdn-core-7.cisco.com Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Sep 2020 16:08:22 -0000 Hello, We have just posted revision 19 of draft-ietf-spring-srv6-network-programmi= ng. This revision addresses the comments received from Brian Weis (SECDIR revie= w) [1,2], Brian Haberman (INTDIR telechat review) [3,4] and Martin Duke. Thank you for the reviews and comments. Regards, Pablo. [1] https://mailarchive.ietf.org/arch/msg/last-call/DA1teHRO4fMSCg-7YZKsWqa= e3tE/ [2] https://mailarchive.ietf.org/arch/msg/last-call/c5V9fbgW1SvPHrHrVwJxvxu= OnHk/ [3] https://mailarchive.ietf.org/arch/msg/last-call/9ld_rgqlN6q3VSjZ-7GcGdn= 4hOQ/ [4] https://mailarchive.ietf.org/arch/msg/last-call/9h8mAe1JcNTvCKTWq8-6nvZ= k0gk/ -----Original Message----- From: spring On Behalf Of internet-drafts@ietf.or= g Sent: viernes, 18 de septiembre de 2020 17:57 To: i-d-announce@ietf.org Cc: spring@ietf.org Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19= .txt A New Internet-Draft is available from the on-line Internet-Drafts director= ies. This draft is a work item of the Source Packet Routing in Networking WG of = the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-19.txt Pages : 42 Date : 2020-09-18 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization (Service Level Agreements). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming= / There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-19 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-progra= mming-19 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-srv6-network-programm= ing-19 Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring From nobody Sun Sep 20 09:52:40 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DA4BF3A0ABA; Sun, 20 Sep 2020 09:52:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QhVhX4e-4v9P; Sun, 20 Sep 2020 09:52:36 -0700 (PDT) Received: from nobulus.com (nobulus.com [195.180.11.152]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EF93E3A046A; Sun, 20 Sep 2020 09:52:34 -0700 (PDT) Received: from nobulus.com (localhost [127.0.0.1]) by nobulus.com (Postfix) with ESMTP id 13F821730D; Sun, 20 Sep 2020 18:52:33 +0200 (CEST) X-Virus-Scanned: amavisd-new at nobulus.com Received: from nobulus.com ([127.0.0.1]) by nobulus.com (nobulus.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id xfchdxT7Lkly; Sun, 20 Sep 2020 18:52:29 +0200 (CEST) Received: from [192.168.0.16] (unknown [37.228.229.28]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by nobulus.com (Postfix) with ESMTPSA id B164E1728A; Sun, 20 Sep 2020 18:52:29 +0200 (CEST) Content-Type: multipart/alternative; boundary=Apple-Mail-C6C1F905-EC1B-4D15-9768-E1D9BE75825D Content-Transfer-Encoding: 7bit From: ILya Varlashkin Mime-Version: 1.0 (1.0) Date: Sun, 20 Sep 2020 17:52:28 +0100 Message-Id: References: <5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark> Cc: IETF Secretariat , Greg Mirsky , spring , spring-chairs@ietf.org, draft-mirsky-spring-bfd@ietf.org In-Reply-To: <5f9d826b-4f7b-4636-8790-17b79c6b232e@Spark> To: Jeff Tantsura X-Mailer: iPhone Mail (17A860) Archived-At: Subject: Re: [spring] The SPRING WG has placed draft-mirsky-spring-bfd in state "Call For Adoption By WG Issued" X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Sep 2020 16:52:39 -0000 --Apple-Mail-C6C1F905-EC1B-4D15-9768-E1D9BE75825D Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I also support the adoption as co-author for the same reasons as outlines by= Greg. Kind regards, iLya Varlashkin > On 14 Sep 2020, at 23:24, Jeff Tantsura wrote: >=20 > =EF=BB=BF > I support the adoption as co-author, for the reasons outlined by Greg. >=20 > Cheers, > Jeff >> On Sep 14, 2020, 2:17 PM -0700, Greg Mirsky , wrot= e: >> Dear All, >> I support the adoption of draft-mirsky-spring-bfd by the SPRING WG for th= e following reasons: >> optional control of the reverse path of the BFD session in SR-MPLS enviro= nment; >> optional reduction of OAM data exchanged between BFD systems by using the= BFD in Demand mode over an SR-MPLS tunnel; >> ability to monitor p2mp SR policies. >> I want to highlight the third point. BFD (based on RFC 5880) has solution= s for lightweight mechanisms to detect defects in a p2mp tunnel. The solutio= n defined in RFC 8562 allows egress BFD nodes to monitor the state of the he= ad-end and related part of the multicast distribution tree. In some scenario= s, it is desirable for the head-end to be able to know the state of an egres= s node and egress's view of the distribution tree. Three options listed in R= FC 8563: >> head notifications with multicast polling >> head notifications with composite polling >> unsolicited notifications >> The two first options described in RFC 8563 in detail while the third is v= ery sketchy. This is the option discussed in the draft, pointing to the solu= tion defined in draft-mirsky-mpls-p2mp-bfd.=20 >>=20 >> Always welcome your questions. >>=20 >> Regards, >> Greg >>=20 >>> On Tue, Sep 8, 2020 at 11:08 AM IETF Secretariat wrote: >>>=20 >>> The SPRING WG has placed draft-mirsky-spring-bfd in state >>> Call For Adoption By WG Issued (entered by Joel Halpern) >>>=20 >>> The document is available at >>> https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ >>>=20 >>> Comment: >>> The authors have requested (quite some time ago) WG adoption for this >>> document. Looking at the archive, there was anot a lot of discussion, a= nd >>> some concerns. Rather than try to infer the current state from the old >>> discussions, the WG Chairs have decided to issue a WG call for adoption.= If >>> you support this becoming a WG document, please explain on the list. If= you >>> oppose this becoming a WG document, please explain on the list. Silence= does >>> not mean consent. >>>=20 >>> Yours, >>> Joel M. Halpern >>>=20 --Apple-Mail-C6C1F905-EC1B-4D15-9768-E1D9BE75825D Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable I also support the adoption as co-author fo= r the same reasons as outlines by Greg.


    Kind regards,
    = iLya Varlashkin

    On 14 Sep 2= 020, at 23:24, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:

    <= /blockquote>
    =EF=BB=BF
    I support the adoption as co-author, for the reasons outli= ned by Greg.

    Cheers,
    Jeff
    On Sep 14, 2020, 2:17 PM -0700, Greg Mirsk= y <gregimirsky@gmail.com>, wrote:
    Dear All,
    I support the adoption of draft-mirsky-spring-bfd by the SPRING WG for t= he following reasons:
    • optional control of the reverse path of the BFD session in SR-MPLS envir= onment;
    • optional reduction of OAM data exchanged between BFD systems by using th= e BFD in Demand mode over an SR-MPLS tunnel;
    • ability to monitor p2mp SR policies.
    I want to highlight the third point. BFD (based on RFC 5880) has s= olutions for lightweight mechanisms to detect defects in a p2mp tunnel. The s= olution defined in RFC 8562 allows egress BFD nodes to monitor the state of t= he head-end and related part of the multicast distribution tree. In some sce= narios, it is desirable for the head-end to be able to know the state of an e= gress node and egress's view of the distribution tree. Three options li= sted in RFC 8563:
    • head notifications with multicast polling
    • head notifications with composite polling
    • unsolicited notifications
    The two first options described in RFC 8563 in detail while the third i= s very sketchy. This is the option discussed in the draft, pointing to the s= olution defined in draft-mirsky-mpls-p2mp-bfd. 

    Always welcome your questions.

    Regards,
    Greg

    On Tue, Sep 8, 2020 at 11:08 AM IETF S= ecretariat <ietf-secre= tariat-reply@ietf.org> wrote:

    The SPRING WG has placed draft-mirsky-spring-bfd in state
    Call For Adoption By WG Issued (entered by Joel Halpern)

    The document is available at
    https://datatracker.ietf.org/doc/draft-mirsky= -spring-bfd/

    Comment:
    The authors have requested (quite some time ago) WG adoption for this
    document.  Looking at the archive, there was anot a lot of discussion, a= nd
    some concerns.  Rather than try to infer the current state from the old=
    discussions, the WG Chairs have decided to issue a WG call for adoption.&nbs= p; If
    you support this becoming a WG document, please explain on the list.  I= f you
    oppose this becoming a WG document, please explain on the list.  Silenc= e does
    not mean consent.

    Yours,
    Joel M. Halpern

    = --Apple-Mail-C6C1F905-EC1B-4D15-9768-E1D9BE75825D-- From nobody Mon Sep 21 02:34:42 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C9B1E3A0AD6; Mon, 21 Sep 2020 02:34:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.917 X-Spam-Level: X-Spam-Status: No, score=-1.917 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gl9yPrd9sScl; Mon, 21 Sep 2020 02:34:37 -0700 (PDT) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5A0953A0BE3; 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Mon, 21 Sep 2020 02:48:17 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160068169730.16306.1491377847049242016@ietfa.amsl.com> Date: Mon, 21 Sep 2020 02:48:17 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-node-protection-for-sr-te-paths-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Sep 2020 09:48:17 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Node Protection for SR-TE Paths Authors : Shraddha Hegde Chris Bowers Stephane Litkowski Xiaohu Xu Feng Xu Filename : draft-ietf-spring-node-protection-for-sr-te-paths-00.txt Pages : 13 Date : 2020-09-21 Abstract: Segment routing supports the creation of explicit paths using adjacency-sids, node-sids, and binding-sids. It is important to provide fast reroute (FRR) mechanisms to respond to failures of links and nodes in the Segment-Routed Traffic-Engineered(SR-TE) path. A point of local repair (PLR) can provide FRR protection against the failure of a link in an SR-TE path by examining only the first (top) label in the SR label stack. In order to protect against the failure of a node, a PLR may need to examine the second label in the stack as well, in order to determine SR-TE path beyond the failed node. This document specifies how a PLR can use the first and second label in the label stack describing an SR-TE path to provide protection against node failures. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-node-protection-for-sr-te-paths/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-node-protection-for-sr-te-paths-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-node-protection-for-sr-te-paths-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Sep 21 10:17:14 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id AEB7C3A08F8; Mon, 21 Sep 2020 10:17:12 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Barry Leiba via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Barry Leiba Message-ID: <160070863224.16553.3215584446210310666@ietfa.amsl.com> Date: Mon, 21 Sep 2020 10:17:12 -0700 Archived-At: Subject: [spring] Barry Leiba's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Sep 2020 17:17:13 -0000 Barry Leiba has entered the following ballot position for draft-ietf-spring-srv6-network-programming-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Throughout the document: It should be “an SID”, “an FIB”, “an RIR”, and some others, not “a”, because one reads these as “ess-eye-dee” and “eff-eye-bee”, not as the expansions thereof. — Section 3.1 — An SRv6 endpoint behavior MAY require additional information I think this is a statement of fact, so “may” (or “might”), not “MAY”. — Section 3.2 — Nit: The plural of “SID” is “SIDs”, without an apostrophe. The provider historically deployed IPv6 and assigned infrastructure address from a portion of the fc00::/7 prefix Nit: “addresses”. In another example, a large mobile and fixed line service provider Nit: hyphenate “fixed-line”. IPv6 address consumption in both these examples is minimum, Nit: “minimal” (also, put a comma before “respectively”). A remote node uses the IANA behavior codepoint to map the received SID (B:N:FUNCT) to a behavior. I don’t know what “IANA behavior codepoint” means. As the rest of the sentence makes it clear that this is mapping to “a behavior”, maybe it’s better to say “registered codepoint”, or some such? Or, as you say a couple of paragraphs down, “Endpoint Behavior codepoint”? In any case, please be consistent about “IANA behavior”, “IANA Behavior”, and “IANA Endpoint Behavior”. My preference would be to avoid saying “IANA” in these, but use your judgment on what’s most understandable and clear. o Assign an SRv6 Locator 2001:db8:bbbb:3::/64 to the Router 3 in their SR Domain What is “the Router 3” (and router 4)? There’s no introduction nor diagram that says. Also, please be consistent in capitalization of these. — Section 3.3 — routing protocol specific aspects that are outside the scope of this Nit: “routing-protocol-specific” needs to be hyphenated. As that’s awkward, you might want to reword to avoid it, “are specific to the routing protocol and are outside the scope....” — Section 4 — The pseudocode describing these behaviors detail local processing Nit: “details”, singular, to match “pseudocode”. — Section 4.1 — The End behavior operates on the same FIB table (i.e. VRF, L3 relay id) associated to the packet. Is “i.e.” really what you want here? How does “VRF, L3 relay” equate to “FIB table”? — Section 4.16.1.3 — segments left to 0. The SDN controller knows that no-other node Nit: “no other” should not be hyphenated. For that matter, the word “other” isn’t needed anyway, because you have “after” in there. -as part of the decapsulation process the egress PE is required to terminates less bytes from the packet. I can’t figure this out. It looks like it should be “required to terminate”, but I don’t know what it means to “terminate less bytes”. Can you reword this? to the lookup engine in the forwarding ASIC. “ASIC” needs to be expanded. As this is the only place you use it, I suggest just using the expansion and not bothering with the abbreviation. — Section 7 — This document introduces SRv6 Endpoint and SR Policy Headend behaviors for implementation on SRv6 capable nodes in the network. As such, this document does not introduce any new security considerations. I’m not convinced of this. It seems that misuse (such as injection or alteration) of some of these Behaviors could, for example, result in packets being forwarded to nodes they were not intended to go to. Is it not important to discuss issues such as that: how these Behaviors might be attacked? Is that really fully covered in 8754 and 8402? — Section 8.1 — The presence of SIDs in the IGP do not imply any routing semantics Nit: “does not”, to match the singular subject “the presence”. an IPv6 address is solely governed by the, non-SID-related, IGP Nit: remove both commas. not governed neither influenced in any way by a SID advertisement Nit: make it “neither governed nor influenced” build TI-LFA [I-D.ietf-rtgwg-segment-routing-ti-lfa] based FRR solutions Nit: there needs to be a hyphen in there, but the citation gets in the way. Make it, “build FRR solutions based on TI-LFA [I-D.ietf-rtgwg-segment-routing-ti-lfa]”. — Section 8.4 — For example, a BGP-LS advertisement of H.Encaps behavior would describe the capability of node N to perform a H.Encaps behavior, specifically it would describe how many SIDs could be pushed by N without significant performance degradation. This is a comma splice. Split the sentence before “specifically” (and put a comma after “specifically”). From nobody Mon Sep 21 10:45:13 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6862B3A09CF; Mon, 21 Sep 2020 10:45:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.101 X-Spam-Level: X-Spam-Status: No, score=-2.101 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MqDE7K6mqDDN; Mon, 21 Sep 2020 10:45:09 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0B3083A08AD; Mon, 21 Sep 2020 10:45:05 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 4BwBfT5dh0z6GHfZ; Mon, 21 Sep 2020 10:45:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1600710305; bh=aSRkjgHu08pIkGAnNoOs3IatAOypyGfH/x7IEbRorhI=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=nHJgZrX4OD5DTvOTzmqW6swpZOcXqAFRUNxiyJNBYN/YEiyDukjq+wBfaWeJ1ortK VeJbpkHqqCV8JalDoUr1AX9L5pL21HEbuakZpDb1InL7YsHYX0qyIlbFzFLM32eEYM txmjGR9shbNKez2l/XtCYfvJurAhCsTcXq5ucQTY= X-Quarantine-ID: <0I__skuDQVvI> X-Virus-Scanned: Debian amavisd-new at a2.tigertech.net Received: from [192.168.128.43] (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 4BwBfS68cNz6GHfM; Mon, 21 Sep 2020 10:45:04 -0700 (PDT) To: Barry Leiba , The IESG Cc: Bruno Decraene , spring@ietf.org, spring-chairs@ietf.org, draft-ietf-spring-srv6-network-programming@ietf.org References: <160070863224.16553.3215584446210310666@ietfa.amsl.com> From: "Joel M. Halpern" Message-ID: <25693278-d1e8-06de-2edf-c79f0f847216@joelhalpern.com> Date: Mon, 21 Sep 2020 13:45:03 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <160070863224.16553.3215584446210310666@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] Barry Leiba's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Sep 2020 17:45:12 -0000 Actually Barry, I would liek to leave the article choice to the RPC. In my experience, one does pronounce SID and FIB as words, but RIR as the letters. Yours, Joel On 9/21/2020 1:17 PM, Barry Leiba via Datatracker wrote: > Barry Leiba has entered the following ballot position for > draft-ietf-spring-srv6-network-programming-19: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Throughout the document: > It should be “an SID”, “an FIB”, “an RIR”, and some others, not “a”, because > one reads these as “ess-eye-dee” and “eff-eye-bee”, not as the expansions > thereof. > > — Section 3.1 — > > An SRv6 endpoint behavior MAY require additional information > > I think this is a statement of fact, so “may” (or “might”), not “MAY”. > > — Section 3.2 — > Nit: The plural of “SID” is “SIDs”, without an apostrophe. > > The provider historically deployed IPv6 and assigned > infrastructure address from a portion of the fc00::/7 prefix > > Nit: “addresses”. > > In another example, a large mobile and fixed line service provider > > Nit: hyphenate “fixed-line”. > > IPv6 address consumption in both these examples is minimum, > > Nit: “minimal” (also, put a comma before “respectively”). > > A remote node uses the IANA behavior codepoint to map the received > SID (B:N:FUNCT) to a behavior. > > I don’t know what “IANA behavior codepoint” means. As the rest of the sentence > makes it clear that this is mapping to “a behavior”, maybe it’s better to say > “registered codepoint”, or some such? Or, as you say a couple of paragraphs > down, “Endpoint Behavior codepoint”? In any case, please be consistent about > “IANA behavior”, “IANA Behavior”, and “IANA Endpoint Behavior”. My preference > would be to avoid saying “IANA” in these, but use your judgment on what’s most > understandable and clear. > > o Assign an SRv6 Locator 2001:db8:bbbb:3::/64 to the Router 3 in > their SR Domain > > What is “the Router 3” (and router 4)? There’s no introduction nor diagram > that says. Also, please be consistent in capitalization of these. > > — Section 3.3 — > > routing protocol specific aspects that are outside the scope of this > > Nit: “routing-protocol-specific” needs to be hyphenated. As that’s awkward, > you might want to reword to avoid it, “are specific to the routing protocol and > are outside the scope....” > > — Section 4 — > > The pseudocode describing these behaviors detail local processing > > Nit: “details”, singular, to match “pseudocode”. > > — Section 4.1 — > > The End behavior operates on the same FIB table (i.e. VRF, L3 relay > id) associated to the packet. > > Is “i.e.” really what you want here? How does “VRF, L3 relay” equate to “FIB > table”? > > — Section 4.16.1.3 — > > segments left to 0. The SDN controller knows that no-other node > > Nit: “no other” should not be hyphenated. For that matter, the word “other” > isn’t needed anyway, because you have “after” in there. > > -as part of the decapsulation process the egress PE is required to > terminates less bytes from the packet. > > I can’t figure this out. It looks like it should be “required to terminate”, > but I don’t know what it means to “terminate less bytes”. Can you reword this? > > to the lookup engine in the forwarding ASIC. > > “ASIC” needs to be expanded. As this is the only place you use it, I suggest > just using the expansion and not bothering with the abbreviation. > > — Section 7 — > > This document introduces SRv6 Endpoint and SR Policy Headend > behaviors for implementation on SRv6 capable nodes in the network. > As such, this document does not introduce any new security > considerations. > > I’m not convinced of this. It seems that misuse (such as injection or > alteration) of some of these Behaviors could, for example, result in packets > being forwarded to nodes they were not intended to go to. Is it not important > to discuss issues such as that: how these Behaviors might be attacked? Is that > really fully covered in 8754 and 8402? > > — Section 8.1 — > > The presence of SIDs in the IGP do not imply any routing semantics > > Nit: “does not”, to match the singular subject “the presence”. > > an IPv6 address is solely governed by the, non-SID-related, IGP > > Nit: remove both commas. > > not governed neither influenced in any way by a SID advertisement > > Nit: make it “neither governed nor influenced” > > build TI-LFA [I-D.ietf-rtgwg-segment-routing-ti-lfa] based FRR > solutions > > Nit: there needs to be a hyphen in there, but the citation gets in the way. > Make it, “build FRR solutions based on TI-LFA > [I-D.ietf-rtgwg-segment-routing-ti-lfa]”. > > — Section 8.4 — > > For example, a BGP-LS advertisement of H.Encaps behavior would > describe the capability of node N to perform a H.Encaps behavior, > specifically it would describe how many SIDs could be pushed by N > without significant performance degradation. > > This is a comma splice. Split the sentence before “specifically” (and put a > comma after “specifically”). > > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > From nobody Mon Sep 21 11:24:15 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1F2133A0B72; Mon, 21 Sep 2020 11:24:14 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Roman Danyliw via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Roman Danyliw Message-ID: <160071265366.14948.8163350323208659826@ietfa.amsl.com> Date: Mon, 21 Sep 2020 11:24:14 -0700 Archived-At: Subject: [spring] Roman Danyliw's Discuss on draft-ietf-spring-srv6-network-programming-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Sep 2020 18:24:14 -0000 Roman Danyliw has entered the following ballot position for draft-ietf-spring-srv6-network-programming-19: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- Section 3.1. (In case I missed it, please provide the obvious reference) Per “In such a case, the semantics and format of the ARG bits are defined as part of the SRv6 endpoint behavior specification”, is “endpoint behavior specification” Section 4 or another document? If the former, I don’t see any references to argument bits in the pseudo-code of the Section 4.* subsections. If the latter, what document? Can the behaviors be polymorphic (i.e., same network behavior accepting different arguments)? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thanks for responding to the SECDIR review (and thank you to Brian Weis for doing it) ** Section 3.2. Per “An SR Source Node cannot infer the behavior by examination of the FUNCT value of a SID”, isn’t there at least some hint provided by the use of the FUNCT from the IANA registry? ** Section 3.2. Per “Function 11 associated with the behavior End.X …” AND Per “Function 12 associated with the behavior End.X …” The initial registrations for Endpoint Behavior per Section 10.2.1 suggest that Function 11 and 12 are End.T. ** Section 4.1. Pseudo-code without formal definition might be open to interpretation. My nits (which likely apply to other sections) are that: -- it might not be clear that S03, S06 and S10 are effectively returns/exits from this “behavior”, and if they are run, S12-S15 should never be reached (otherwise Segments Left or Hop Limit = -1) -- (for consistency) the IF … ELSEIF … END construct is used in Section 4.8, but not here. -- What does it mean to indent the code? For example S06 is: S06. Send an ICMP Time Exceeded message to the Source Address, Code 0 (Hop limit exceeded in transit), Interrupt packet processing and discard the packet. I can see why “Code 0 …” is indented under “Send an … “ as this is a line wrap, but why is “Interrupt packet processing?” ** A few other psuedo code nits: -- Section 4.1. S05 uses “IPv6 Hop Limit” but S12 uses “Hop Limit”. Recommend consistency. -- Section 4.4. Per S05. Is “next header” purposely lower case? I asked because it looks like explicit field names are in upper case (e.g., S03 says “Segments Left field”). -- Section 4.16.3. As a style/consistency note, the other sections which check the upper header type seem use of a construct of != 41 or 4 to “Process per Section 4.1.1”. (e.g., Section 4.4, 4.5, 4.6, etc.) ** Section 8. Given how meticulously the Section 4 guidance was described, it would be helpful to say that the HMAC TLV processing, if present, happens as a notional Step “S0” per guidance in Section 2.1.2.1 of RFC8754. ** Editorial Nits: -- Section 3.2. Typo. s/an network/a network/ -- Section 3.2. Typo. s/is minimum/is minimal/ From nobody Mon Sep 21 17:18:13 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 061FB3A0F4D; Mon, 21 Sep 2020 17:18:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zoelu0i--PKx; Mon, 21 Sep 2020 17:18:02 -0700 (PDT) Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EF5523A0F4B; Mon, 21 Sep 2020 17:18:01 -0700 (PDT) Received: by mail-lf1-x12d.google.com with SMTP id z17so16012894lfi.12; Mon, 21 Sep 2020 17:18:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=I6ikgf4x51HoQYopLgZPXAtt7pFitSqrANTZlzEiwEc=; b=vIPBZzoCWQNEK3OVXNC1mWrIYx5on2hnjY3e6aIYICSmXQkVy7wsBllHx2B1aAw3FT AsUQPRhhPz7xr4GRdLUebn2rxeUgifpgTv0Hr1cuaykf7pVV8IYdnWlvoYizjY0K7g/c rtkLSJAbmWIEQzLCWDv/SCLfvi5rSIz/YRgAmQf2FEULUHUhaibwwJedMdPBlckj0ilu VEvElBBP6+Lba/TqcLCi04HGE0pHKiat0VtJp1J6zQNZ0HOmiNUrTLT9lufwVomwvkNO B932eMO+6RkSMnNEp+XK9KTqWmR9lMm8Yyj/2QrKQ1QC5XfiP71JqOUy85nTNZAr6aAC YNYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=I6ikgf4x51HoQYopLgZPXAtt7pFitSqrANTZlzEiwEc=; b=XpfTFUGiIcgHgxulRS6so0c6aJJhtB1cDtgBHgjOsD06cJV+niwnEAz4n3G+ZOiUTy rE67BH3NsBvRRnphQ3dfqPypANS6n4KFqOd55m/0/LRNjvhQb9tIfvryFEzTPk5HbJUf jTBVMa36rgrDHuuXZy2W1zLNDCoURsib7BIpbu8IuSYrYFloUsc7BP0xouEys2i5GwXb Uxy4opVujuAzEjpU3RBXEuJJxy4ArjHTLu27SNWFd2GTmaywk0YgahllkxyTZopjvtFX SGA7lTUrQjsDhBBaRikgOfqvGN18K7bseHBLw1q82Pqg7yk14duS2dsPcMZAFlDX1aHT bwpg== X-Gm-Message-State: AOAM532OyzzRbjpOnlX0Wz+AaX5Trkk8AGjRBrdhnYivTw0iVcNuq3ZP 6gc5UpzTmGxWKgtmANxwNjlIFHbhjmOd+neQMsY= X-Google-Smtp-Source: ABdhPJzUJhOkgDewb3p6Z3polGGW8TIJyZqJ8wGwugSEmDgO0b/fkfkyotIlWTm5YLDRkOmWmBHPbpf3pbui84hK5BM= X-Received: by 2002:a19:7e86:: with SMTP id z128mr708719lfc.433.1600733880057; Mon, 21 Sep 2020 17:18:00 -0700 (PDT) MIME-Version: 1.0 References: <160044460449.22443.18008787285553768570@ietfa.amsl.com> In-Reply-To: From: Greg Mirsky Date: Mon, 21 Sep 2020 17:17:48 -0700 Message-ID: To: "Pablo Camarillo (pcamaril)" Cc: "last-call@ietf.org" , "spring@ietf.org" , The IESG Content-Type: multipart/alternative; boundary="0000000000004d037505afdbe649" Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 00:18:04 -0000 --0000000000004d037505afdbe649 Content-Type: text/plain; charset="UTF-8" Dear Authors, et al., I've got a question, probably a very naive one, so my apologies in the front. The document in Section 4.16 defines a number of flavors of End, End.X, and End.T behaviors. Given that this is the SRv6 document and I don't seem to find analogous definitions for SR-MPLS, is it safe to assume that the defined flavors, e.g., PSP, can be used in SR-MPLS? Regards, Greg On Fri, Sep 18, 2020 at 9:09 AM Pablo Camarillo (pcamaril) wrote: > Hello, > > We have just posted revision 19 of > draft-ietf-spring-srv6-network-programming. > > This revision addresses the comments received from Brian Weis (SECDIR > review) [1,2], Brian Haberman (INTDIR telechat review) [3,4] and Martin > Duke. > > Thank you for the reviews and comments. > > Regards, > Pablo. > > [1] > https://mailarchive.ietf.org/arch/msg/last-call/DA1teHRO4fMSCg-7YZKsWqae3tE/ > [2] > https://mailarchive.ietf.org/arch/msg/last-call/c5V9fbgW1SvPHrHrVwJxvxuOnHk/ > [3] > https://mailarchive.ietf.org/arch/msg/last-call/9ld_rgqlN6q3VSjZ-7GcGdn4hOQ/ > [4] > https://mailarchive.ietf.org/arch/msg/last-call/9h8mAe1JcNTvCKTWq8-6nvZk0gk/ > > -----Original Message----- > From: spring On Behalf Of > internet-drafts@ietf.org > Sent: viernes, 18 de septiembre de 2020 17:57 > To: i-d-announce@ietf.org > Cc: spring@ietf.org > Subject: [spring] I-D Action: > draft-ietf-spring-srv6-network-programming-19.txt > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Source Packet Routing in Networking WG of > the IETF. > > Title : SRv6 Network Programming > Authors : Clarence Filsfils > Pablo Camarillo Garvia > John Leddy > Daniel Voyer > Satoru Matsushima > Zhenbin Li > Filename : draft-ietf-spring-srv6-network-programming-19.txt > Pages : 42 > Date : 2020-09-18 > > Abstract: > The SRv6 Network Programming framework enables a network operator or > an application to specify a packet processing program by encoding a > sequence of instructions in the IPv6 packet header. > > Each instruction is implemented on one or several nodes in the > network and identified by an SRv6 Segment Identifier in the packet. > > This document defines the SRv6 Network Programming concept and > specifies the base set of SRv6 behaviors that enables the creation of > interoperable overlays with underlay optimization (Service Level > Agreements). > > > The IETF datatracker status page for this draft is: > > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-19 > > https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-19 > > A diff from the previous version is available at: > > https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-19 > > > Please note that it may take a couple of minutes from the time of > submission until the htmlized version and diff are available at > tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > --0000000000004d037505afdbe649 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Dear Authors, et al.,
    I've got a question, probabl= y a very naive one, so my apologies in the front.
    The document in= Section 4.16 defines a number of flavors of=C2=A0End, End.X, and End.T beh= aviors. Given that this is the SRv6 document and I don't seem to find a= nalogous definitions for SR-MPLS, is it safe to assume that the defined fla= vors, e.g., PSP, can be used in SR-MPLS?

    Regards,<= /div>
    Greg

    On Fri, Sep 18, 2020 at 9:09 AM Pablo Camarillo (pcamar= il) <pcamaril=3D40cisco.co= m@dmarc.ietf.org> wrote:
    Hello,

    We have just posted revision 19 of draft-ietf-spring-srv6-network-programmi= ng.

    This revision addresses the comments received from Brian Weis (SECDIR revie= w) [1,2], Brian Haberman=C2=A0 (INTDIR telechat review) [3,4] and Martin Du= ke.

    Thank you for the reviews and comments.

    Regards,
    Pablo.

    [1] https://mailarchive.= ietf.org/arch/msg/last-call/DA1teHRO4fMSCg-7YZKsWqae3tE/
    [2] https://mailarchive.= ietf.org/arch/msg/last-call/c5V9fbgW1SvPHrHrVwJxvxuOnHk/
    [3] https://mailarchive.= ietf.org/arch/msg/last-call/9ld_rgqlN6q3VSjZ-7GcGdn4hOQ/
    [4] https://mailarchive.= ietf.org/arch/msg/last-call/9h8mAe1JcNTvCKTWq8-6nvZk0gk/

    -----Original Message-----
    From: spring <spring-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
    Sent: viernes, 18 de septiembre de 2020 17:57
    To: i-d-announce= @ietf.org
    Cc: spring@ietf.org
    Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19= .txt


    A New Internet-Draft is available from the on-line Internet-Drafts director= ies.
    This draft is a work item of the Source Packet Routing in Networking WG of = the IETF.

    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= SRv6 Network Programming
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Clar= ence Filsfils
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Pablo Camarillo Garvia
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 John Leddy
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Daniel Voyer
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Satoru Matsushima
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Zhenbin Li
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet= f-spring-srv6-network-programming-19.txt
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= 42
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 := 2020-09-18

    Abstract:
    =C2=A0 =C2=A0The SRv6 Network Programming framework enables a network opera= tor or
    =C2=A0 =C2=A0an application to specify a packet processing program by encod= ing a
    =C2=A0 =C2=A0sequence of instructions in the IPv6 packet header.

    =C2=A0 =C2=A0Each instruction is implemented on one or several nodes in the=
    =C2=A0 =C2=A0network and identified by an SRv6 Segment Identifier in the pa= cket.

    =C2=A0 =C2=A0This document defines the SRv6 Network Programming concept and=
    =C2=A0 =C2=A0specifies the base set of SRv6 behaviors that enables the crea= tion of
    =C2=A0 =C2=A0interoperable overlays with underlay optimization (Service Lev= el
    =C2=A0 =C2=A0Agreements).


    The IETF datatracker status page for this draft is:
    https://datatracker.ietf= .org/doc/draft-ietf-spring-srv6-network-programming/

    There are also htmlized versions available at:
    https://tools.ietf.org/html= /draft-ietf-spring-srv6-network-programming-19
    https://datatrack= er.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-19

    A diff from the previous version is available at:
    https://www.ietf.or= g/rfcdiff?url2=3Ddraft-ietf-spring-srv6-network-programming-19


    Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org.

    Internet-Drafts are also available by anonymous FTP at:
    ftp://ftp.ietf.org/internet-drafts/


    _______________________________________________
    spring mailing list
    spring@ietf.org https://www.ietf.org/mailman/listinfo/spring

    _______________________________________________
    spring mailing list
    spring@ietf.org https://www.ietf.org/mailman/listinfo/spring
    --0000000000004d037505afdbe649-- From nobody Tue Sep 22 02:15:07 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C9713A0A74; Tue, 22 Sep 2020 02:15:05 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Robert Wilton via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Robert Wilton Message-ID: <160076610524.13099.16066036582221511974@ietfa.amsl.com> Date: Tue, 22 Sep 2020 02:15:05 -0700 Archived-At: Subject: [spring] Robert Wilton's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 09:15:06 -0000 Robert Wilton has entered the following ballot position for draft-ietf-spring-srv6-network-programming-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Hi, Thank for this document. Not surprisingly given the large number of contributors working on this document I only have a few minor comments: 2. Terminology NH: Next-header field of the IPv6 header [RFC8200]. NH=SRH means that the next-header of the IPv6 header is Routing Header for IPv6(43) with the Type field set to 4. Suggest expanding "4" to SRH(4) 10.1. Ethernet Next Header Type This document requests IANA to allocate, in the "Protocol Numbers" registry (https://www.iana.org/assignments/protocol-numbers/protocol- numbers.xhtml), a new value for "Ethernet" with the following definition: The value 143 in the Next Header field of an IPv6 header or any extension header indicates that the payload is an Ethernet [IEEE.802.3_2012]. Should this point to the latest published version of 802.3 (2018), or does it specifically need to reference an older version? 3.1. SID Format This document defines an SRv6 SID as consisting of LOC:FUNCT:ARG, where a locator (LOC) is encoded in the L most significant bits of the SID, followed by F bits of function (FUNCT) and A bits of arguments (ARG). L, the locator length, is flexible, and an operator is free to use the locator length of their choice. F and A may be any value as long as L+F+A <= 128. When L+F+A is less than 128 then the remainder of the SID MUST be zero. This was reasonably clear to me, but since the rest of the description refers to bits, then I wonder whether the last sentence would be more precise as "the remaining bits of the SID must be set to zero"? 4.1. End: Endpoint S09. If ((Last Entry > max_LE) or (Segments Left > Last Entry+1)) { It wasn't entirely apparent to me where 'Last Entry' comes from, although that became more clear when I saw its usage later. Possibly it would be helpful to list "Segments Left" and "Last Entry" in the terminology as taken from RFC 8754? 4.1. End: Endpoint S12. Decrement Hop Limit by 1 Would it be more clear to expand this to say "Decrement IPv6 Hop Limit by 1", since it is referred to as the IPv6 Hop Limit previously. If this is changed, then there are a couple of other places in the document that should be checked as well. 4.2. End.X: Layer-3 Cross-Connect Note that if N has an outgoing interface bundle I to a neighbor Q made of 10 member links, N may allocate up to 11 End.X local SIDs: one for the bundle(LAG) itself and then up to one for each Layer-2 member link. This behaviour seems slightly unusual to me. I presume that the intent here is for the SR program to control which member link the traffic travels over rather than the normal behaviour of relying on the Bundle hashing. Possibly adding a bit more text to clarify the expected behaviour might be helpful. 4.4. End.DX6: Decapsulation and IPv6 Cross-Connect S05. If the End.DX6 SID is bound to an array of L3 adjacencies, then one entry of the array is selected based on the hash of the packet's header Section 7. The end of this sentence doesn't scan for me, probably it should be something end something like: ", see Section 7" 6. Counters A node supporting this document SHOULD implement a combined traffic counter (packets and bytes) per local SID entry, for traffic that matched that SID and was processed correctly. The retrieval of these counters via MIB, NETCONF/YANG or any other means is outside the scope of this document. >From my reading, a combined counter implies a single counter that is incremented by both the number of packets processed and number of bytes processed. Normally in the management models you would normally expect this to be modeled as a pair of counters, and I presume that is what is desired here? If so I would suggest clarifying this text to indicate that it is a pair of counters (one for packets, one for bytes) that are required here. Section 4, various places. At various points the Upper-Layer Header type is compared to a number (e.g. 4, 41, 143). It might be a bit more readable if the associated names were also included in the description. E.g., 4(IPv4), 41(IPv6), etc. 4.10. End.DX2V: Decapsulation and VLAN L2 Table Lookup Is this lookup just on the outermost VLAN Id, or all VLAN tags in the exposed Ethernet header? Or is this implementation specific? Regards, Rob From nobody Tue Sep 22 08:44:05 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 821A63A083B for ; Tue, 22 Sep 2020 08:44:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zwqrNX3egmZY for ; Tue, 22 Sep 2020 08:44:01 -0700 (PDT) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E734A3A0FB9 for ; Tue, 22 Sep 2020 08:44:01 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 4BwlwK5Mf3z6GR95 for ; Tue, 22 Sep 2020 08:44:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1600789441; bh=bFXt9UCDuYJ+Kdpn51l2grCnqd4zjlvsNhZfSR5uHUQ=; h=Subject:References:To:From:Date:In-Reply-To:From; b=VIRetfjF2S6/CEluaTJDmVJFDTqs3+kqbqWqkdXIVkIsEiQVC7czSWnqD5AGc/z3y uXPplzyJ73vi2Ae450X0XuGYovqBaVksZ1JL8jdXVY+fTYEXMYJqUVFS2OD/UL1LcA mJL48vcIxMRRnT394+OZiSexKaGh/LQDee1dJTKA= X-Quarantine-ID: <0wZGHrQFBXtg> X-Virus-Scanned: Debian amavisd-new at a2.tigertech.net Received: from [192.168.128.43] (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 4BwlwK2NTYz6GR6H for ; Tue, 22 Sep 2020 08:44:01 -0700 (PDT) References: <160078890311.12724.3507335652115118527@ietfa.amsl.com> To: "spring@ietf.org" From: "Joel M. Halpern" X-Forwarded-Message-Id: <160078890311.12724.3507335652115118527@ietfa.amsl.com> Message-ID: Date: Tue, 22 Sep 2020 11:43:59 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <160078890311.12724.3507335652115118527@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [spring] Fwd: IETF WG state changed for draft-mirsky-spring-bfd X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 15:44:05 -0000 As noted below, the adoption call for draft-mirsky-spring-bfd has completed, and the draft is adopted. Thank you, Joel -------- Forwarded Message -------- Subject: IETF WG state changed for draft-mirsky-spring-bfd Resent-Date: Tue, 22 Sep 2020 08:35:03 -0700 (PDT) Resent-From: alias-bounces@ietf.org Resent-To: bruno.decraene@orange.com, pengshuping@huawei.com, jmh@joelhalpern.com, james.n.guichard@futurewei.com Date: Tue, 22 Sep 2020 08:35:03 -0700 From: IETF Secretariat To: draft-mirsky-spring-bfd@ietf.org, spring-chairs@ietf.org The IETF WG state of draft-mirsky-spring-bfd has been changed to "Adopted by a WG" from "Call For Adoption By WG Issued" by Joel Halpern: https://datatracker.ietf.org/doc/draft-mirsky-spring-bfd/ Comment: The call for adoption has completed after two weeks. there were no objections and some support (Less than we would like, but the chairs have concluded it is sufficient.) Authors, please issue as draft-ietf-spring-bfd, and the chairs will approve it. Thank you, Joel (and Jim and Bruno) From nobody Tue Sep 22 10:56:37 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 90AE93A18B7; Tue, 22 Sep 2020 10:56:35 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Brian Weis via Datatracker To: Cc: draft-ietf-spring-srv6-network-programming.all@ietf.org, last-call@ietf.org, spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <160079739555.27095.23366687198553864@ietfa.amsl.com> Reply-To: Brian Weis Date: Tue, 22 Sep 2020 10:56:35 -0700 Archived-At: Subject: [spring] Secdir telechat review of draft-ietf-spring-srv6-network-programming-19 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 17:56:36 -0000 Reviewer: Brian Weis Review result: Ready I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. This is a re-review; thanks to the authors for addressing suggestions made in the first review. The new security considerations text is good, and logically correct so I've marked this document as "Ready". But let me explain one way I think that it could be improved. The last email exchange was about suggesting that the HMAC TLV be used even when an SRH is not included in the packet. The newest text "regardless of the number of segments in the segment list" implies this case, but there is still a concern is that implementors won't get this hint about the possible need to protect just one segment where the SRH is omitted because it's not needed. It would be nice if this sentence could be more explicit about the need for an HMAC TLV in this case. For example, something like: "regardless of the number of segments in the segment list." "regardless of whether the segments are defined in an SRH header or a single segment is passed in the Destination Address." Thanks. From nobody Tue Sep 22 12:10:03 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D7A43A0B7D; Tue, 22 Sep 2020 12:10:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0W9reYLf3dtA; Tue, 22 Sep 2020 12:10:00 -0700 (PDT) Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25FD13A0B77; Tue, 22 Sep 2020 12:10:00 -0700 (PDT) Received: by mail-lf1-x133.google.com with SMTP id q8so19246295lfb.6; Tue, 22 Sep 2020 12:10:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=Huj1STBZXPqgkbhVtT6I68TAQa3p6F7KiuRxqk9tgrE=; b=UVCRh5q2t/qMZp39Cws3Vp4DoAlt1/Uik4g85N8rJ/PxQVSqm21YfOb6yqASKIo6FQ 6vDqL4FKmSdkcAP1k/xa0K7OPiYvGVZBDgdXQlcxLvaDoZU9x57DGXfHDHEgiUIWpC4Z ejqT/iRz1MphqIX4FNL+cxfiyGjPVW/FD92AF7wX8npimYftSu/qHaD3VNJHoe/cBYm7 RPIiMVI8XnapFm1+EgTJlzIWV/9cMijPhO8q722uAwCEB73c5A6XQFFwAIzwnZZZF0f1 0NkuGgC0Uk/RjCBMrCpZfBcY1FfcQhJ+FSiYJPQS3jTp2YC5dygZJj3VFhUyJk0pDPRB s0Uw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=Huj1STBZXPqgkbhVtT6I68TAQa3p6F7KiuRxqk9tgrE=; b=fvz42PG9Z3iVfXt+WFUSC6jd7akoJFNCuLxPfrulqf9KvP0IhykLDLz+Fzxkwaadum 9jUDVBOZjoooqdqHd5pz6oLsaht9iAhn9ad2XyKEeXy6JAAn807m5cHGztIr863Zrxiq 9LNCslsNm3A8+YNOuvrQI6O7zZhdZgidNjvlQUcaCunlcbHU4bNyJKBi5Aett9Uh4rUT ykk8e0IspSklnf74sV0pG+g0xPvJuVibR18alXQP167Q07EbYA3vqXq7Ppc9XgqTGNQ5 YDgnKq88qv5Fh8D0S7bilIqIxHOJnjjC9ctsNbCWRdp3zCgf/tfYvOjvNqc5SjvNqhOF pf+A== X-Gm-Message-State: AOAM531VfXGWeQlipEVRhSdPlNdt5Y7t5NCEhCYMgEx6g9Nt38OvLjG/ qFa9uGYjAYTkarlAyxHrRC3GEhSjE2tAZX75sAVhv/kMqTY= X-Google-Smtp-Source: ABdhPJyHbptOZBa7BSAAtG97hadpTmQqhfvsgkQdDSCM3n9WkVnnaEoJIo5DFq/DZuNyFmytRH6qlTRwjASSklVoAKY= X-Received: by 2002:ac2:495a:: with SMTP id o26mr2308350lfi.94.1600801797931; Tue, 22 Sep 2020 12:09:57 -0700 (PDT) MIME-Version: 1.0 From: Greg Mirsky Date: Tue, 22 Sep 2020 12:09:46 -0700 Message-ID: To: spring-chairs@ietf.org, spring , draft-mirsky-spring-bfd@ietf.org Content-Type: multipart/alternative; boundary="0000000000008587d405afebb60d" Archived-At: Subject: [spring] IPR related to draft-mirsky-spring-bfd X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 19:10:02 -0000 --0000000000008587d405afebb60d Content-Type: text/plain; charset="UTF-8" Dear All, please note that I am not aware of any IPR that applies to this document. Regards, Greg --0000000000008587d405afebb60d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Dear All,
    please note that I am not aware of any IPR t= hat applies to this document.

    Regards,
    G= reg=C2=A0
    --0000000000008587d405afebb60d-- From nobody Tue Sep 22 12:19:56 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id F0B503A0B88; Tue, 22 Sep 2020 12:19:49 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com, brian@innovationslab.net X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <160080238997.30451.1320287424719470187@ietfa.amsl.com> Date: Tue, 22 Sep 2020 12:19:49 -0700 Archived-At: Subject: [spring] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ie?= =?utf-8?q?tf-spring-srv6-network-programming-19=3A_=28with_COMMENT=29?= X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 19:19:50 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-spring-srv6-network-programming-19: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for the work put into this document. Thank you also for having edited the document based on the INT-DIR review by Brian Haberman (thank you Brian for the detailed review!) and replying to Brian's review. https://datatracker.ietf.org/doc/review-ietf-spring-srv6-network-programming-18-intdir-telechat-haberman-2020-09-14/ Please find below a couple of non-blocking COMMENT points and nits. I hope that this helps to improve the document, Regards, -éric == COMMENTS == -- Section 3 -- There is some text copied from section 4.3 from RFC 8754. But, even if it seems obvious that the behaviors specified in this document _ONLY_ apply when "A FIB entry that represents a locally instantiated SRv6 SID", I suggest to spell it out to avoid any ambiguity. -- Section 3.2 -- I am a little ambivalent with Brian's point about the location of the given examples. On one hand, those real case examples of SID allocation are really helpful to understand the impact of allocation; on the other hand, it is usual to move examples in appendix. Curious to see if other IESG members have other point of view. In the last short example (this one could stay in the current location), should the value of F and A be stated? They are obvious from the used SID value of course, but, let's be complete ? -- Section 3.3 -- Please follow RFC 5952 and write all IPv6 in lowercase. -- Section 4.2 and 4.3 -- As "End.X" and "End.T" behaviors are variants of the "End" behavior, does the section 4.1.1 (Upper-Layer Header) also apply ? -- Section 4.9 -- For consistency with previous behavior descriptions of End.DT[46], I suggest to mention that 143 has been reserved by IANA. == NITS == -- Section 2 -- In the bullet list, there are a couple of missing '.' at the end of the list items. -- Section 3 -- "longest-prefix-match lookup on the packets destination address" "packets" should probably be singular. In "IPv6 subnet allocated for SRv6 SIDs by the operator", should it rather be "prefix" than "subnet" ? -- Section 3.2 -- Strongly suggest to be consistent with the use of "IANA Endpoint Behavior codepoint" as sometimes it is shortened into "IANA Behavior" (also unsure whether the "IANA" qualification is really useful here) -- Section 4.2 -- "one for the bundle(LAG)" Link Aggregation has not been expanded before and I am not sure whether the 'LAG' adds anything to the paragraph. -- Section 4.16 -- Should PSP, USP, USD be expanded in the short introduction of this section ? -- Section 8 -- The usual location of the security considerations is after all specification section, so, it should be after the 'control plane' section. From nobody Tue Sep 22 12:28:32 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 5873A3A0BC6; Tue, 22 Sep 2020 12:28:26 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160080290632.9778.9683894050044735772@ietfa.amsl.com> Date: Tue, 22 Sep 2020 12:28:26 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-bfd-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 19:28:26 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane Authors : Greg Mirsky Jeff Tantsura Ilya Varlashkin Mach(Guoyi) Chen Jiang Wenying Filename : draft-ietf-spring-bfd-00.txt Pages : 14 Date : 2020-09-22 Abstract: Segment Routing (SR) architecture leverages the paradigm of source routing. It can be realized in the Multiprotocol Label Switching (MPLS) network without any change to the data plane. A segment is encoded as an MPLS label, and an ordered list of segments is encoded as a stack of labels. Bidirectional Forwarding Detection (BFD) is expected to monitor any existing path between systems. This document defines how to use Label Switched Path Ping to bootstrap a BFD session, control an SR Policy in the reverse direction of the SR-MPLS tunnel, and applicability of BFD Demand mode in the SR-MPLS domain. Also, the document describes the use of BFD Echo with BFD Control packet payload. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-bfd/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-bfd-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-bfd-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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b=ulR0T7v4ICq6irGimvdFR29bfX4va7r8aW4attsU8gKE/NSVlCmY1aEtK0MByFeFT/zOr0Pw33sRDvSrAdEmrjpW5p5vyAIkLftfWc/9pFJ3Dd+0XeK29TbH1DTPVH4F1rVMkV5Ad04LTFUjjUEsiW9yxWKdqjirZXtuehGUlKI= Received: from MWHPR11MB1374.namprd11.prod.outlook.com (2603:10b6:300:24::8) by MWHPR11MB1631.namprd11.prod.outlook.com (2603:10b6:301:10::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3412.20; Tue, 22 Sep 2020 20:02:51 +0000 Received: from MWHPR11MB1374.namprd11.prod.outlook.com ([fe80::91c6:cab8:6b42:58ca]) by MWHPR11MB1374.namprd11.prod.outlook.com ([fe80::91c6:cab8:6b42:58ca%3]) with mapi id 15.20.3391.024; Tue, 22 Sep 2020 20:02:51 +0000 From: "Pablo Camarillo (pcamaril)" To: "Rob Wilton (rwilton)" , The IESG CC: "draft-ietf-spring-srv6-network-programming@ietf.org" , "spring-chairs@ietf.org" , "spring@ietf.org" , Bruno Decraene , Joel Halpern Thread-Topic: Robert Wilton's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) 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--_000_MWHPR11MB1374C060A4362D81BAF81565C93B0MWHPR11MB1374namp_-- From nobody Tue Sep 22 14:04:59 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 155963A08F5; Tue, 22 Sep 2020 14:04:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.403 X-Spam-Level: X-Spam-Status: No, score=-1.403 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id N0igXoFVKNvH; Tue, 22 Sep 2020 14:04:53 -0700 (PDT) Received: from mail-vk1-f170.google.com (mail-vk1-f170.google.com [209.85.221.170]) (using TLSv1.2 with cipher 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50fvMvQyhPXpbOXcFbg2KwoC3tQsCa6qtTBeJo8= X-Google-Smtp-Source: ABdhPJzHKhC+mqDNyAzMln6O8RK8SKN1YYeK2F0uTr644rgOG0RM4LW92EkMlbCyk86sL4lEC29/p+MoeTlPrU4fHX4= X-Received: by 2002:a1f:2d0c:: with SMTP id t12mr5241140vkt.0.1600808691805; Tue, 22 Sep 2020 14:04:51 -0700 (PDT) MIME-Version: 1.0 References: <160070863224.16553.3215584446210310666@ietfa.amsl.com> In-Reply-To: From: Barry Leiba Date: Tue, 22 Sep 2020 17:04:40 -0400 Message-ID: To: "Pablo Camarillo (pcamaril)" Cc: The IESG , "draft-ietf-spring-srv6-network-programming@ietf.org" , "spring-chairs@ietf.org" , "spring@ietf.org" , Bruno Decraene , Joel Halpern Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] Barry Leiba's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 21:04:54 -0000 Thanks for the reply, Pablo (and thanks also to Joel for his reply). All good here. And just confirming three items in particular: >> It should be =E2=80=9Can SID=E2=80=9D, =E2=80=9Can FIB=E2=80=9D, =E2=80= =9Can RIR=E2=80=9D, and some others, not =E2=80=9Ca=E2=80=9D, because one r= eads these as >> =E2=80=9Cess-eye-dee=E2=80=9D and =E2=80=9Ceff-eye-bee=E2=80=9D, not as = the expansions thereof. > > [PC] Agreed for RIR. For the other ones I=E2=80=99ve seen some disagreeme= nt on this regard in between > native English speakers. I=E2=80=99m not a native English speaker, hence = I would prefer to leave the decision > up to RFC Editor. As Joel said also, and I agree. >> I can=E2=80=99t figure this out. It looks like it should be =E2=80=9Cre= quired to terminate=E2=80=9D, but I don=E2=80=99t know what it means > to =E2=80=9Cterminate less bytes=E2=80=9D. Can you reword this? > > [PC] I propose the following diff: > > as part of the decapsulation process the egress PE is required to termina= tes less bytes from the packet. > > > as part of the decapsulation process the egress PE is required to parse a= nd remove fewer bytes from the packet. > A very fine change; thanks. >> This document introduces SRv6 Endpoint and SR Policy Headend >> behaviors for implementation on SRv6 capable nodes in the network. >> As such, this document does not introduce any new security >> considerations. >> >> I=E2=80=99m not convinced of this. It seems that misuse (such as inject= ion or alteration) of some of these Behaviors could, >> for example, result in packets being forwarded to nodes they were not in= tended to go to. Is it not important to >> discuss issues such as that: how these Behaviors might be attacked? Is = that really fully covered in 8754 and 8402? > > [PC] You mention injection alteration or misuse of these behaviors, the p= aragraph preceding the one you quote > in revision 19 states: > =E2=80=9CAdditionally, [RFC8754] defines an HMAC TLV permitting SR > Endpoint Nodes in the SR domain to verify that the SRH applied to a > packet was selected by an authorized party and to ensure that the > segment list is not modified after generation, regardless of the > number of segments in the segment list.=E2=80=9D > > This text was added to revision 19 as part of the SECDIR review, and I th= ink this provides a reminder of how misuse > or alteration within the SR domain of trust can be handled based on RFC87= 54. Can you please check if this addresses > your comment? It does, and thanks for pointing it out. I think I must have had that comment left over from an earlier start on reviewing, and hadn't double-checked it with the latest version. Barry From nobody Tue Sep 22 14:45:16 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D34CB3A1A0A; Tue, 22 Sep 2020 14:45:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s5ODBG6po9Tb; Tue, 22 Sep 2020 14:45:13 -0700 (PDT) Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8AF593A1A05; Tue, 22 Sep 2020 14:45:13 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id bw23so2119631pjb.2; Tue, 22 Sep 2020 14:45:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version; bh=B1hfri2K1t1AY5b7ISxJM5DDKDoj1UICPUx478XJYlw=; b=qDJ0DVnv9/fX5OGhyUe6Dgo5g5tNDnMo6f05WbDgG4MIg6UuMWLJfyxfqM4oeHwpsI s33cHUtxdYIlDkWqKLtKFj1rNT3/JryrJiOep72otyZORKGYTP9hyvDSgFEH/nMaOLQA Y/csTYxX+b62egf2SQNInjLQv2i/fHoiw1isKC6XTmlidD5icjRk+xgyK0oEkpBRJIVW P8Wz80BAAQLu7WdN+xiEpFmEPU6/lRnvYr+NLMV+uq+jOV+3uWrwkiSx90e9PO0x8qRh 5SE+UQ7SqBG1VLE8ltypBKVFyX7JyE0GkHRm4/16+5QAOPsMPBYiI5iA89CcOA0KohIP IZaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version; bh=B1hfri2K1t1AY5b7ISxJM5DDKDoj1UICPUx478XJYlw=; b=GsgJPL9eidP39UX00VyS0stcffH+q0JKlBODOiM9azNd3Eqnm3L83Sp7N8754koPyq AQ24iSBV8/SVOmmpX7IsCwKIiQEK6FbNhrDneYkN9zvYmOEPQrUwMmPRa2dyHGAfYNQQ KmbUll684sHlOv7ZZ4GWkPOCC+aGzKNgegrngTFZWbs0r+m45jm3Lryxce+xSRrWrhp3 QIsw376xDRuuq48zpnlCIfbSo5e5nbwuJqQukS+y8Q9Q7V+6uJwzDxRh1NAsqOvBhX+E +pkm5xiQa7PGDstkCY9Dn+1Yocn2ChnG8sEx3yGT5kbh2yvCRdp0sm+eBBHGtsw4gVLo oQGQ== X-Gm-Message-State: AOAM531GOBEOqTS/zMj7jGAH+C1fO5bSGUawEW55I8wMyqOYqWNHPMyo qoxB6yMr3rJx3Rov3hrLXtuGxSbLyRY= X-Google-Smtp-Source: ABdhPJz0Q8qSbbwZ8qiyQ+rorqQclF82TdadNdqaabgC4yTK4zcCwWbnpnRGzOyxpW70yOSBtR3o8g== X-Received: by 2002:a17:90b:1245:: with SMTP id gx5mr5327817pjb.193.1600811110152; Tue, 22 Sep 2020 14:45:10 -0700 (PDT) Received: from [192.168.1.14] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id q190sm17127779pfq.99.2020.09.22.14.45.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Sep 2020 14:45:09 -0700 (PDT) Date: Tue, 22 Sep 2020 14:45:01 -0700 From: Jeff Tantsura To: spring-chairs@ietf.org, spring , draft-mirsky-spring-bfd@ietf.org, Greg Mirsky Message-ID: <30030d9a-e875-47c8-94b2-fc7531490e10@Spark> In-Reply-To: References: X-Readdle-Message-ID: 30030d9a-e875-47c8-94b2-fc7531490e10@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5f6a7062_75c6c33a_172e6" Archived-At: Subject: Re: [spring] IPR related to draft-mirsky-spring-bfd X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 21:45:15 -0000 --5f6a7062_75c6c33a_172e6 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline +1 , not aware of any IPR applicable. Cheers, Jeff On Sep 22, 2020, 12:10 PM -0700, Greg Mirsky , wrote: > Dear All, > please note that I am not aware of any IPR that applies to this document. > > Regards, > Greg --5f6a7062_75c6c33a_172e6 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
    +1 , not aware of any IPR applicable.&=23160;
    =

    Cheers,
    Jeff
    On Sep 22, 2020, 12:10 PM -0700, Gr= eg Mirsky <gregimirsky=40gmail.com>, wrote:
    Dear All,
    please note that I am not aware of any IPR that applies to this docu= ment.

    Regards,
    Greg&=23160;
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Sep 2020 19:28:00 -0700 (PDT) Received: from lhreml747-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id E4EF42E17B4711D0A4BA; Wed, 23 Sep 2020 03:27:56 +0100 (IST) Received: from lhreml747-chm.china.huawei.com (10.201.108.197) by lhreml747-chm.china.huawei.com (10.201.108.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Wed, 23 Sep 2020 03:27:56 +0100 Received: from DGGEML422-HUB.china.huawei.com (10.1.199.39) by lhreml747-chm.china.huawei.com (10.201.108.197) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.1.1913.5 via Frontend Transport; Wed, 23 Sep 2020 03:27:56 +0100 Received: from DGGEML530-MBS.china.huawei.com ([169.254.8.210]) by dggeml422-hub.china.huawei.com ([10.1.199.39]) with mapi id 14.03.0487.000; Wed, 23 Sep 2020 10:27:53 +0800 From: Mach Chen To: Jeff Tantsura , "spring-chairs@ietf.org" , spring , "draft-mirsky-spring-bfd@ietf.org" , "Greg Mirsky" Thread-Topic: IPR related to draft-mirsky-spring-bfd Thread-Index: AQHWkRQJdnb/Pf8iC0m9stkWNs3mDal0qvqAgADU8qA= Date: Wed, 23 Sep 2020 02:27:52 +0000 Message-ID: References: <30030d9a-e875-47c8-94b2-fc7531490e10@Spark> In-Reply-To: <30030d9a-e875-47c8-94b2-fc7531490e10@Spark> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.140] Content-Type: multipart/alternative; boundary="_000_F73A3CB31E8BE34FA1BBE3C8F0CB2AE297E803A2dggeml530mbschi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] IPR related to draft-mirsky-spring-bfd X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2020 02:28:02 -0000 --_000_F73A3CB31E8BE34FA1BBE3C8F0CB2AE297E803A2dggeml530mbschi_ Content-Type: text/plain; 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DQpbUENdIEFjay4gU2VjdGlvbiBtb3ZlZC4NCg0KDQoNCg== From nobody Wed Sep 23 09:22:11 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B3EF63A122A; Wed, 23 Sep 2020 09:22:08 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160087812869.848.11431337980296271714@ietfa.amsl.com> Date: Wed, 23 Sep 2020 09:22:08 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-20.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2020 16:22:09 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-20.txt Pages : 42 Date : 2020-09-23 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization (Service Level Agreements). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-20 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-20 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-20 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Sep 2020 16:27:49.7257 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kXXoaMC23Vuwr1Uhy1CaLAPg+QWYX55ohLAv4+w16i5AiLwZ+/66FKiqHJnv+4qkIkJEvlA69LF7ZYZI2TkRTw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2191 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.14, xch-aln-004.cisco.com X-Outbound-Node: alln-core-8.cisco.com Archived-At: Subject: Re: [spring] Barry Leiba's No Objection on draft-ietf-spring-srv6-network-programming-19: (with COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2020 16:27:55 -0000 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Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 62F203A150A; Wed, 23 Sep 2020 13:57:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Alvaro Retana via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Alvaro Retana Message-ID: <160089467694.11025.16329903730475278493@ietfa.amsl.com> Date: Wed, 23 Sep 2020 13:57:57 -0700 Archived-At: Subject: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2020 20:57:57 -0000 Alvaro Retana has entered the following ballot position for draft-ietf-spring-srv6-network-programming-20: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I am balloting DISCUSS because I find the document unclear and lacking proper technical details around significant functionality, as reflected in my first 3 points. The fourth point is related to the registration policy (which doesn't match the definition in rfc8126), and my last point is for the IESG to consider. (1) Pseudocode and normative behavior The use of pseudocode was chosen as the mechanism to specify behavior, as explained in §4: An implementation of the pseudocode is compliant as long as the externally observable wire protocol is as described by the pseudocode. Clarity in the pseudocode is essential because it is used to determine compliance. Several places need improvement: (1a) In §4.1/§4.13/§4.15, the pseudocode is missing an ELSE after S04, to include the error conditions if SL != 0. A check for an error condition when SL is decremented is also needed. As written, the pseudocode could process the packet (SL == 0) *and* send an ICMP time exceeded message... :-( I'm using as a reference the pseudocode in §4.3.1.1/rfc8754, which includes the same initial statement. (1b) It would be nice if the behavior in §4.1.1 were also specified using pseudocode. As written, I am not sure if the intent is to process any upper-layer header or only specific ones. Is the objective for this operation to be similar to the one in §4.3.1.2/rfc8754? Please be specific on what is meant by "allowed by local configuration". [Note: this point by itself is not DISCUSS-worthy, but §4.1.1 is used, for different reasons, in some of the other items I point to below. That is why I include it here.] (1c) §4.4/§4.6: S01 of the second piece of pseudocode is an instruction for processing a non-IPv6 upper header. However, earlier in that section, it is specified that the SID "is associated with one or more L3 IPv6 adjacencies/an IPv6 FIB table". How can the upper header not be IPv6 if the specification explicitly says it has to be? (1d) §4.5/§4.7 have the same issue but related to IPv4. (1e) §4.9 also has the same issue when it specifies that "End.DX2 SID...is associated with one outgoing interface I", but allows for the processing of non-ethernet payloads which could then be forwarded through a different outgoing interface. (1f) §4.11/§4.12 allows the processing of non-ethernet payloads, which will not be "associated with an L2 Table T" as described. (2) §4.12 describes the only behavior that can carry an ARG. I don't understand how it works: Arg.FE2 is encoded in the SID as an (k*x)-bit value. These bits represent a list of up to k OIFs, each identified with an x-bit value. Values k and x are defined on a per End.DT2M SID basis. The interface identifier 0 indicates an empty entry in the interface list. Let's assume a router has 10 possible OIFs, and the operator uses 4-bit values to identify them; then, the ARG would take 40 bits of the SID. Is that how the math works? Assuming my interpretation is correct, for 20 OIFs and 5-bit values we would need 100 bits. Considering the examples in §3.2, where a /64 is allocated to a router, this behavior wouldn't have enough bits! I realize that maybe a better encoding would be to use a 20-bit field, each representing an interface. However, there would still be a limit of < 64 OIFs. Am I missing something? I'm trying to ultimately get to the fact that there are limits to this behavior, but they are not described in the document. Please clearly explain any limitations and any possible workaround. (3) The description of the flavors in §4.16 is also unclear. The section starts with this introduction: The PSP, USP and USD flavors are variants of the End, End.X and End.T behaviors. For each of these behaviors these flavors MAY be supported for a SID either individually or in combinations. By being "variants", I interpret that the behavior is different than what is specified in §4.1. (3a) Some of the behaviors, as listed in Table 4, include an indication of the flavors. How are the values interpreted? For example, the Table lists 8 different behaviors related to End: | 1 | 0x0001 | End (no PSP, no USP) | [This.ID] | | 2 | 0x0002 | End with PSP | [This.ID] | | 3 | 0x0003 | End with USP | [This.ID] | | 4 | 0x0004 | End with PSP&USP | [This.ID] | ... | 28 | 0x001C | End with USD | [This.ID] | | 29 | 0x001D | End with PSP&USD | [This.ID] | | 30 | 0x001E | End with USP&USD | [This.ID] | | 31 | 0x001F | End with PSP, USP & USD | [This.ID] | Is value 1 what is specified in §4.1? Or does it include USD, which is not explicitly excluded)? (3b) If a behavior with more than one flavor is signaled, how should the receiving node determine which one to apply? I guess that the application of behaviors 4 or 29 depends on the number of SLs -- the expected behavior should be clearly specified. (3c) Is it assumed that all nodes support all behaviors? Are there mandatory to implement behaviors? Should the behavior be advertised before it is used? (3d) §4.16.1.2: When a SID of PSP-flavor is processed at a non-penultimate SR Segment Endpoint Node, the PSP behavior is not performed as described in the pseudocode below since Segments Left would not be zero. For example, for the End behavior, I'm assuming that behavior 1 is performed instead of 2 (or 4, or 29, or 31) if SL != 0. Should this be done even if the node did not advertise the non-PSP flavor? If the node is not known to support the PSP flavor, should it be an error to receive a packet requesting that behavior? If only the PSP flavor is advertised, can the Source assume that the node also supports the non-PSP flavor? [BTW, I'm asking about advertisement because §4.16.1.1 makes the statement that the nodes "advertise the SIDs instantiated on them via control plane protocols as described in Section 9". Even though §9 talks about control plane protocols are "not necessary for an SDN control plane" because "one expects the controller to explicitly provision the SIDs".] (3e) §4.16.2 describes the USP flavor, which is one where the endpoint consumes the packet by processing the next header. I don't understand how the outcome due to the extended process is different from the original one in §4.1. Can you please explain? It seems to me that the externally observable result is the same. I have the same question about the USD flavor and the externally observable behavior related to §4.1. In general, the observable behavior of §4.1, USP, and USD seem the same to me. The next two points are related. (3f) §4.16.3 describes the USD flavor, which assumes that the decapsulation results in a packet that can be forwarded. Can the FIB lookup result in a local destination? (3g) Does the USD flavor mean that, for the End behavior (as described in §4.1), the action of "process the next header in the packet" cannot result in a forwarded packet? Same question for the USP behavior? (3h) The last paragraph in §4.16.3: An implementation that supports the USD flavor in conjunction with the USP flavor MAY optimize the packet processing by first looking whether the conditions for the USD flavor are met, in which case it can proceed with USD processing else do USP processing. What are the "conditions for the USD flavor"? As far as I can tell from the document, the only condition is for the specific behavior to be signaled. What else? Going back to the questions above... When is the option to optimize possible? Does a specific behavior have to be used? Behavior 30 (End with USP&USD)? Or can it also optimize if behavior 3 (End with USP) is signaled? (4) §10.2 creates a new registry with an "FCFS" registration procedure. I am assuming that this is the same as the "First Come First Served" (no abbreviation!) policy from rfc8126; please add a reference if that is the case. The description used is not the same as what rfc8126 specifies: - "Requests for allocation...must include a...preferably also a brief description of how the value will be used." Using "preferably" indicates that a description is optional. However, it is not optional in rfc8126. - "...brief description...may be provided with a reference to an Internet Draft or an RFC or in some other documentation that is permanently and readily available." There is no such requirement in rfc8126. For example, the "Specification Required" policy requires "a permanent and readily available public specification". Is that what you want instead? (5) This point is for the IESG to discuss. §4.16.1.2: The End, End.X and End.T behaviors with PSP do not contravene Section 4 of [RFC8200] because the destination address of the incoming packet is the address of the node executing the behavior. The spring WG's interpretation of rfc8200 was a central point in the appeal presented against the WG consensus on this document. The text above, I believe, reflects that consensus. However, given that the document relies on the spring WG's interpretation of rfc8200, I think it would be better if the text is explicit. Suggestion: to add at the end of the paragraph> This conclusion represents the consensus interpretation of the spring WG. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- (1) §3.1: An SRv6 endpoint behavior MAY require additional information for its processing (e.g. related to the flow or service). This information may be encoded in the ARG bits of the SID. The sentence is simply stating a fact, not a normative behavior. s/MAY/may (2) All the examples in §3.2 have a /48 prefix allocated to the SRv6 deployment (and then /64s per node). Is it possible to start with a different SRv6 infrastructure allocation, a /64, or /96 maybe? If so, please include an example. If not, please explain any limitations. (3) §4 starts by saying that "Each FIB entry indicates the behavior associated with a SID instance and its parameters." But the previous section (§3.3. SID Reachability) says that "node N would advertise IPv6 prefix(es) matching the LOC parts covering its SIDs or shorter-mask prefix" (not the behavior). IOW, §3.3 sets the expectation of an advertisement covering just the LOC, but §4 seems to expect entries that cover the LOC+FUNC. Which one is correct? In the end, it may not matter which entry is in the FIB, as long as the SID is reachable. However, the specification of the behavior feels sloppy. (4) §4.9/§4.10: For the S04 step, perhaps decompose it into individual actions (similar to S04-S06 in §4.7). (5) §4.11/§4.12 "S05. Learn the exposed MAC Source Address..." The note related to this step says that in "EVPN, the learning...is done via the control plane"...but here it is done via the data plane. What, if any, is the effect on EVPN operation? Are there issues with learning conflicting information from different sources? It seems to me that it could be relatively easy to spoof the source and create unexpected entries in the L2 table. Please point to the EVPN documents where this type of operation is considered. (6) §4.10/§4.11/§4.12 don't have references to the example applications mentioned. Please add Informative references. (7) §4.13/§4.15 instantiate a Binding SID, but only in the case where SL != 0. What about the case where a Binding SID wouldn't require an extra encapsulation (SL == 0)? Is there a reason that it is not supported in this document? (8) §5.1: I'm assuming that the last line in this section (the one starting with S03) should be proceeded by "Note:". (9) §5.1: "The H.Encaps behavior is valid for any kind of Layer-3 traffic." While it may be used for any kind of traffic, I'm assuming that there will be a policy that determines which traffic is encapsulated using a specific SRv6 policy, right? Please be specific about that. (10) §5.3: "Ethernet [IEEE.802.3_2012]" Please use the reference when Ethernet is first used in the document. [I have the same question as Rob related to the version of the 802.3 spec.] (11) §5.3: "...MUST remove the preamble or frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate the preamble or FCS before forwarding Ethernet frame." Which one? The preamble can be easily recreated by the receiver, while removing the FCS may be more problematic -- even if the FCS is not checked in transit, it seems that it would be important to carry it. In any case, the real question here is: why use "or"? Is it left at the discretion of the encapsulating node? Are there any considerations when selecting? (12) All the headend behaviors (§5) include this text: The push of the SRH MAY be omitted when the SRv6 Policy only contains one segment and there is no need to use any flag, tag or TLV. If the endpoint behavior indicates the PSP or USP flavors, what should the receiver do? Clearly there is no SRH to pop. Is this an error or should the receiver simply ignore the flavor? (13) §6: "counter...for traffic that matched that SID and was processed correctly" Does "processed correctly" include when the result being an ICMP error message? Or should those be counted separately? (14) §7: I'm guessing that "flow-based hash" and "load-balancing hash" are the same thing, is that correct? It would be nice to use consistent terminology. (15) §8: A rogue node inside the SR domain may (on purpose) signal the wrong behavior for a flow, which may result in the delivery of the traffic to the wrong destination (potentially including destinations outside the domain), among other things. Note that this action is possible even if the rogue node is authenticated and authorized to generate an SRH. I didn't find this threat mentioned in rfc8402/rfc8754. (16) §9.4: I'm not sure what the purpose of §9 is, as a whole. But the summary in §9.4 puzzles me more; what is the intent? Does Table 1 indicate that, for example, an IGP implementation should not advertise the End.B6.Encaps behavior? Does Table 2 indicate that only BGP-LS should signal the ability to H.Encaps.L2? I am confused about the value/intent because the text clearly says that the control plane is outside the scope of this document. (17) [nits] s/an network operator/a network operator s/one billionth and one millionth of the assigned address space/one billionth and one millionth of the available address space s/packet's header Section 7/packet's header (Section 7)/g s/bundle(LAG)/bundle (LAG) Please expand LAG. From nobody Wed Sep 23 17:22:52 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D68E23A15E6; Wed, 23 Sep 2020 17:22:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.854 X-Spam-Level: X-Spam-Status: No, score=-0.854 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, NORMAL_HTTP_TO_IP=0.001, NUMERIC_HTTP_ADDR=1.242, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9gQ_TIx321v5; Wed, 23 Sep 2020 17:22:44 -0700 (PDT) Received: from mail-oi1-x233.google.com (mail-oi1-x233.google.com [IPv6:2607:f8b0:4864:20::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5F2B53A15E5; Wed, 23 Sep 2020 17:22:44 -0700 (PDT) Received: by mail-oi1-x233.google.com with SMTP id i17so1774838oig.10; Wed, 23 Sep 2020 17:22:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Uv3brUnlsCGP9raC4ANjJBIRfLLAF+0Y71Bc97yMZMw=; b=QwCpIc5kZeiHvx/TmBbmhUpoS68q+bc3e6GT+yHTiiKqHyqWndQtnQxAykcgjrYKSV +Cb7jXepiWveweIuozDslgVTq1eHoN9r97f8/qQX4qS0Ws022700LjXASxlzm39tHI32 y9xOXWLe9MGx3ulIbk3jLXKvhd/9WAhzH3TI3hwWYLPqgE3BvhFO9ePadsZQzejBmIJq UwrX81o1NNGGkZblPwoA8oIVSJiqT57W8B3aMQcNxhiCoFUR1J1h3RhJlbxulw9h4cvB hXCiR33/0/eOwPGbG2cwQzSnAkGpiaFIOHZa4AMF7YSxttUdHsxVGcP6sl75V4gACVbw 2HHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Uv3brUnlsCGP9raC4ANjJBIRfLLAF+0Y71Bc97yMZMw=; b=A2q0XA5W17MYg9BnncO//kvu8Z/+HYLO+tkfSVu5hR3rKe9j54B1OaRt9znLhSp8pu HZU7SF+AvqMtJGKvNdrTQgAnlmKT2UnLQq48NXDQ5zdRPlu8RKLHtyLIMSCrk3e0dgSR jNANOZwMo85hoOyIbOJM2NzntvYdGLXIb30wwWpcqxcd9sxbV+sHBY6VsVQWmRLlncXm O8sKQVMl/ubOCP26VzoVVFEOtkxqqe28OQtjJUZzDTeoJG3f/jZY/qfcUwULlbhI+aP8 agBMRVLtY2p0NfVecz2ATuY5ol3Fvdh4/qNBupz8vzwYUWgYcGcfGtl8jm4ZbeL8qnsZ pPXg== X-Gm-Message-State: AOAM530zlpYOjE2utnnXkzTRrWgvpD5XiaGPuL8eT0cn9Bl7sVjfIAeM C1lb4e3EW8TID9ARxDKqiJEc5e3DA17eBn0qaOI= X-Google-Smtp-Source: ABdhPJyZa4Mk/kNBfqlnGsKtkYIClBfmowhml/Tfj6qV9Vgduudn9Wryiszz6g6C143lCf5EJ9bgqJ4uPumuURkcyTg= X-Received: by 2002:aca:654b:: with SMTP id j11mr1114633oiw.77.1600906963547; Wed, 23 Sep 2020 17:22:43 -0700 (PDT) MIME-Version: 1.0 References: <160089467694.11025.16329903730475278493@ietfa.amsl.com> In-Reply-To: <160089467694.11025.16329903730475278493@ietfa.amsl.com> From: Erik Kline Date: Wed, 23 Sep 2020 17:22:32 -0700 Message-ID: To: Alvaro Retana Cc: The IESG , Bruno Decraene , SPRING WG , Joel Halpern , spring-chairs@ietf.org, draft-ietf-spring-srv6-network-programming Content-Type: multipart/alternative; boundary="000000000000e179a205b004324d" Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 00:22:46 -0000 --000000000000e179a205b004324d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > > (5) This point is for the IESG to discuss. > > =C2=A74.16.1.2: > > The End, End.X and End.T behaviors with PSP do not contravene > Section 4 of [RFC8200] because the destination address of the > incoming packet is the address of the node executing the behavior. > > The spring WG's interpretation of rfc8200 was a central point in the appe= al > presented against the WG consensus on this document. The text above, I > believe, reflects that consensus. > > However, given that the document relies on the spring WG's interpretation > of > rfc8200, I think it would be better if the text is explicit. > > Suggestion: to add at the end of the paragraph> > > This conclusion represents the consensus interpretation of the spring > WG. > This seems like an important -- and entirely reasonable -- thing to note. --000000000000e179a205b004324d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    (5) This point is for the IESG to discuss.

    =C2=A74.16= .1.2:

    =C2=A0 =C2=A0 =C2=A0 The End, End.X and End.T behaviors with PSP do not con= travene
    =C2=A0 =C2=A0 =C2=A0 Section 4 of [RFC8200] because the destination address= of the
    =C2=A0 =C2=A0 =C2=A0 incoming packet is the address of the node executing t= he behavior.

    The spring WG's interpretation of rfc8200 was a central point in the ap= peal
    presented against the WG consensus on this document.=C2=A0 The text above, = I
    believe, reflects that consensus.

    However, given that the document relies on the spring WG's interpretati= on of
    rfc8200, I think it would be better if the text is explicit.

    Suggestion: to add at the end of the paragraph>

    =C2=A0 =C2=A0This conclusion represents the consensus interpretation of the= spring WG.

    This seems like an importan= t -- and entirely reasonable -- thing to note.
    --000000000000e179a205b004324d-- From nobody Wed Sep 23 18:34:58 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3657B3A0913; Wed, 23 Sep 2020 18:34:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CqkbAK1umve3; Wed, 23 Sep 2020 18:34:47 -0700 (PDT) Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 071D93A090D; Wed, 23 Sep 2020 18:34:47 -0700 (PDT) Received: by mail-lj1-x234.google.com with SMTP id a22so1236909ljp.13; Wed, 23 Sep 2020 18:34:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=DF7twzJC8aTD9txNIleMmhGVyCt5B60wvPXx0eDUCLw=; b=rj6fznVubKWVNlx7L7x76lTKJEqBOrolfecdCQFwJlDF6qsc84v+Wl0YMxe/RtUFtH VohZb/Iz0WFlYTxDZ4Q/NrPXlI97l0Uk0T60OjQ3nE7LqV8O8Marx+eJ2nqHIfOkYW6m YnKq+fOsBMhJXhmGRvSx1EcI9g8LoT6AX2bUrL5uKeMWM3mjQy2ROaNgiXDj1/ZinrnS G13+20pK+QeY19m/iysYXdS5vTU5hzYCdiLhYDiFqd6wCO3AL67zAkM9yjd04BdLqovP dQJM6Wm44FriY+b5k9YTgI/HeCTZyWXk5vk9cFA2/wyf/hPhYYZBfgdzlWvFUom0Q/Iw Puog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=DF7twzJC8aTD9txNIleMmhGVyCt5B60wvPXx0eDUCLw=; b=nPHtdV9yLze6CEQPJot1urSTKg804w7qZoxjlwpOUpym8sp9UAakfwwfPiCDgnLi4C +15BY1mob7dqf5MPm2Me/eNx0sjZnobFRF+qs9XUM/1W0b71CZjgMXqsaYXtU/j/ue4q fEDExijw1+aNPI508DyMZ9K7DGIdI0zecsAxMx5yqcOWicA+YqZSb/GR8FpTOts/v3Zz R2AhpCTTM5fWiq+ea1q1Su0aOUT3szFhNhLD1/RpVEqswCA2pWW7JkthGBShtWFPW01i V0LV2mdJq59VHzU1e+9nc2o5hgRhS27dIPlENekFKCeYy1dq2ZQC6vAmv8Dx1amT8m56 fXNQ== X-Gm-Message-State: AOAM531hWqhL0PwQU/JUrjHx8gStKB8GJNrtx/aXgv/lhsIPYUw1umGJ lPWkmtdqlwtVKsmSIe5R/raxKLF4MDB+D4TdsLs= X-Google-Smtp-Source: ABdhPJy8gyHrGSR4YR6Dq+vwza98pq+lyTlDqcebBAaCKbQjBAhVWem40VZ0G7qK/nuCP/USd/EwCZuALvfiQ0RgAPw= X-Received: by 2002:a2e:a16c:: with SMTP id u12mr734372ljl.266.1600911284990; Wed, 23 Sep 2020 18:34:44 -0700 (PDT) MIME-Version: 1.0 References: <160044460449.22443.18008787285553768570@ietfa.amsl.com> In-Reply-To: From: Greg Mirsky Date: Wed, 23 Sep 2020 18:34:33 -0700 Message-ID: To: "Pablo Camarillo (pcamaril)" Cc: "last-call@ietf.org" , "spring@ietf.org" , The IESG Content-Type: multipart/alternative; boundary="00000000000075779d05b00534f0" Archived-At: Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 01:34:49 -0000 --00000000000075779d05b00534f0 Content-Type: text/plain; charset="UTF-8" Hi Pablo, I apologize for the confusion I've caused on the last-call list. It was not appropriate to ask my question here. As for the technical side, I've got good references and have figured it all out. Kind regards, Greg On Tue, Sep 22, 2020 at 1:04 PM Pablo Camarillo (pcamaril) < pcamaril@cisco.com> wrote: > Hi Greg, > > > > Could you please clarify your question? This document is about SRv6, hence > I do not understand your question on SR-MPLS applicability. > > > > Thank you, > > Pablo. > > > > *From:* Greg Mirsky > *Sent:* martes, 22 de septiembre de 2020 2:18 > *To:* Pablo Camarillo (pcamaril) > *Cc:* last-call@ietf.org; spring@ietf.org; The IESG > *Subject:* Re: [spring] I-D Action: > draft-ietf-spring-srv6-network-programming-19.txt > > > > Dear Authors, et al., > > I've got a question, probably a very naive one, so my apologies in the > front. > > The document in Section 4.16 defines a number of flavors of End, End.X, > and End.T behaviors. Given that this is the SRv6 document and I don't seem > to find analogous definitions for SR-MPLS, is it safe to assume that the > defined flavors, e.g., PSP, can be used in SR-MPLS? > > > > Regards, > > Greg > > > > On Fri, Sep 18, 2020 at 9:09 AM Pablo Camarillo (pcamaril) 40cisco.com@dmarc.ietf.org> wrote: > > Hello, > > We have just posted revision 19 of > draft-ietf-spring-srv6-network-programming. > > This revision addresses the comments received from Brian Weis (SECDIR > review) [1,2], Brian Haberman (INTDIR telechat review) [3,4] and Martin > Duke. > > Thank you for the reviews and comments. > > Regards, > Pablo. > > [1] > https://mailarchive.ietf.org/arch/msg/last-call/DA1teHRO4fMSCg-7YZKsWqae3tE/ > [2] > https://mailarchive.ietf.org/arch/msg/last-call/c5V9fbgW1SvPHrHrVwJxvxuOnHk/ > [3] > https://mailarchive.ietf.org/arch/msg/last-call/9ld_rgqlN6q3VSjZ-7GcGdn4hOQ/ > [4] > https://mailarchive.ietf.org/arch/msg/last-call/9h8mAe1JcNTvCKTWq8-6nvZk0gk/ > > -----Original Message----- > From: spring On Behalf Of > internet-drafts@ietf.org > Sent: viernes, 18 de septiembre de 2020 17:57 > To: i-d-announce@ietf.org > Cc: spring@ietf.org > Subject: [spring] I-D Action: > draft-ietf-spring-srv6-network-programming-19.txt > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Source Packet Routing in Networking WG of > the IETF. > > Title : SRv6 Network Programming > Authors : Clarence Filsfils > Pablo Camarillo Garvia > John Leddy > Daniel Voyer > Satoru Matsushima > Zhenbin Li > Filename : draft-ietf-spring-srv6-network-programming-19.txt > Pages : 42 > Date : 2020-09-18 > > Abstract: > The SRv6 Network Programming framework enables a network operator or > an application to specify a packet processing program by encoding a > sequence of instructions in the IPv6 packet header. > > Each instruction is implemented on one or several nodes in the > network and identified by an SRv6 Segment Identifier in the packet. > > This document defines the SRv6 Network Programming concept and > specifies the base set of SRv6 behaviors that enables the creation of > interoperable overlays with underlay optimization (Service Level > Agreements). > > > The IETF datatracker status page for this draft is: > > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-19 > > https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-19 > > A diff from the previous version is available at: > > https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-19 > > > Please note that it may take a couple of minutes from the time of > submission until the htmlized version and diff are available at > tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring > > --00000000000075779d05b00534f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi Pablo,
    I apologize for the confusion I've cause= d on the last-call list. It was not appropriate to ask my question here.
    As for the technical side, I've got good references and have fi= gured it all out.

    Kind regards,
    Greg

    On Tue, Sep 22, 2020 at 1:04 PM Pablo Camarillo (pcamaril) <pcamaril@cisco.com> wrote:

    Hi Greg,

    =C2=A0

    Could you please clarify your q= uestion? This document is about SRv6, hence I do not understand your questi= on on SR-MPLS applicability.

    =C2=A0

    Thank you,=

    Pablo.

    =C2=A0

    From: Greg Mirsky <gregimirsky@gmail.com>
    Sent: martes, 22 de septiembre de 2020 2:18
    To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
    Cc: last-cal= l@ietf.org; spring= @ietf.org; The IESG <iesg@ietf.org>
    Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-network-pro= gramming-19.txt

    =C2=A0

    Dear Authors, et al.,=

    I've got a question, probab= ly a very naive one, so my apologies in the front.

    The document in Section 4.16 de= fines a number of flavors of=C2=A0End, End.X, and End.T behaviors. Given th= at this is the SRv6 document and I don't seem to find analogous definit= ions for SR-MPLS, is it safe to assume that the defined flavors, e.g., PSP, can be used in SR-MPLS?

    =C2=A0

    Regards,

    Greg

    =C2=A0

    On Fri, Sep 18, 2020 at 9:09 AM= Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dma= rc.ietf.org> wrote:=

    Hello,

    We have just posted revision 19 of draft-ietf-spring-srv6-network-programmi= ng.

    This revision addresses the comments received from Brian Weis (SECDIR revie= w) [1,2], Brian Haberman=C2=A0 (INTDIR telechat review) [3,4] and Martin Du= ke.

    Thank you for the reviews and comments.

    Regards,
    Pablo.

    [1]     https://mai= larchive.ietf.org/arch/msg/last-call/DA1teHRO4fMSCg-7YZKsWqae3tE/
    [2]     https://mai= larchive.ietf.org/arch/msg/last-call/c5V9fbgW1SvPHrHrVwJxvxuOnHk/
    [3]     https://mai= larchive.ietf.org/arch/msg/last-call/9ld_rgqlN6q3VSjZ-7GcGdn4hOQ/
    [4]     https://mai= larchive.ietf.org/arch/msg/last-call/9h8mAe1JcNTvCKTWq8-6nvZk0gk/

    -----Original Message-----
    From: spring <    spring-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
    Sent: viernes, 18 de septiembre de 2020 17:57
    To:     i-d-announce@ietf.org
    Cc:     spring@ietf.org
    Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-19= .txt


    A New Internet-Draft is available from the on-line Internet-Drafts director= ies.
    This draft is a work item of the Source Packet Routing in Networking WG of = the IETF.

    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= SRv6 Network Programming
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Clar= ence Filsfils
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Pablo Camarillo Garvia
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 John Leddy
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Daniel Voyer
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Satoru Matsushima
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Zhenbin Li
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet= f-spring-srv6-network-programming-19.txt
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= 42
    =C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 := 2020-09-18

    Abstract:
    =C2=A0 =C2=A0The SRv6 Network Programming framework enables a network opera= tor or
    =C2=A0 =C2=A0an application to specify a packet processing program by encod= ing a
    =C2=A0 =C2=A0sequence of instructions in the IPv6 packet header.

    =C2=A0 =C2=A0Each instruction is implemented on one or several nodes in the=
    =C2=A0 =C2=A0network and identified by an SRv6 Segment Identifier in the pa= cket.

    =C2=A0 =C2=A0This document defines the SRv6 Network Programming concept and=
    =C2=A0 =C2=A0specifies the base set of SRv6 behaviors that enables the crea= tion of
    =C2=A0 =C2=A0interoperable overlays with underlay optimization (Service Lev= el
    =C2=A0 =C2=A0Agreements).


    The IETF datatracker status page for this draft is:
    https://datatra= cker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/

    There are also htmlized versions available at:
    https://tools.ietf= .org/html/draft-ietf-spring-srv6-network-programming-19
    https://= datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-19=

    A diff from the previous version is available at:
    https://ww= w.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-srv6-network-programming-19


    Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at     tools.ietf.org.

    Internet-Drafts are also available by anonymous FTP at:
    ftp://ftp.ietf.org/internet-drafts/


    _______________________________________________
    spring mailing list
    spring@ietf.org
    https://www.ietf.org/mailman/listinfo/spring

    _______________________________________________
    spring mailing list
    spring@ietf.org
    https://www.ietf.org/mailman/listinfo/spring

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OriginalChecksum:80120FEB01913FD2E7E6BFA9B48889016EEF7018614535B913CB4DA478F479C8; UpperCasedChecksum:6AB833013733FC75BD2B2D3DB27E6D1710B27424046126CCDF1A7D17163631A3; SizeAsReceived:9134; Count:50 Received: from MEYP282MB2022.AUSP282.PROD.OUTLOOK.COM ([fe80::91ba:86b9:40f8:17cf]) by MEYP282MB2022.AUSP282.PROD.OUTLOOK.COM ([fe80::91ba:86b9:40f8:17cf%6]) with mapi id 15.20.3391.026; Thu, 24 Sep 2020 02:27:29 +0000 Date: Thu, 24 Sep 2020 10:28:01 +0800 From: "li_zhenqiang@hotmail.com" To: "Erik Kline" , "Alvaro Retana" Cc: "spring@ietf.org" , "spring-chairs@ietf.org" , "bruno.decraene@orange.com" , "The IESG" , "Joel M. Halpern" , draft-ietf-spring-srv6-network-programming References: <160089467694.11025.16329903730475278493@ietfa.amsl.com>, X-Has-Attach: no X-Mailer: Foxmail 7.2.9.156[cn] Message-ID: Content-Type: multipart/alternative; boundary="----=_001_NextPart248718713580_=----" X-ClientProxiedBy: HK2PR04CA0060.apcprd04.prod.outlook.com (2603:1096:202:14::28) To MEYP282MB2022.AUSP282.PROD.OUTLOOK.COM (2603:10c6:220:b4::7) X-Microsoft-Original-Message-ID: <2020092410275806132036@hotmail.com> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from cmcc-PC (183.243.244.31) by HK2PR04CA0060.apcprd04.prod.outlook.com (2603:1096:202:14::28) with Microsoft SMTP Server (version=TLS1_1, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.20.3412.21 via Frontend Transport; Thu, 24 Sep 2020 02:27:26 +0000 X-Priority: 3 X-Has-Attach: no X-Mailer: Foxmail 7.2.9.156[cn] X-Microsoft-Original-Message-ID: <2020092410275806132036@hotmail.com> X-TMN: [3sA+XcUk3T7VhRlOFLf0ZID1FNOMtsLY] X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 50 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: cf3c1a65-0ae1-4c95-57c9-08d8603161c9 X-MS-TrafficTypeDiagnostic: PU1APC01HT142: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: ecShM3pfhK8X5mfZa+Ua/oDBZt1Wyx34bBwFs+4b7lAccmTBoj/FCjUDb1C03URGiOzUXwqjRihnR3MQ+UZJv7QDYJlC4oNPTsFKzSYDVbfZ6E1K9KtKIlosIJHYUucHpxgBwJBYgiaP0M8mK04ai5NbhFQA75s2lVaVoUcwr8Svmp8Q80LmksbrJN88BzjQ84sRgeHsa/2Eng4GRq6xTkQmWkKoeZJ1Jq85cnygvkuNNp66c+4EHgfhqQjx51a9 X-MS-Exchange-AntiSpam-MessageData: G7UMy3ve9Po62ogOlQE7vn02MrDTh/GE9jkHH9czMLf6PWpgWDTMS8OmZOp9cajT0YFtZBSrKw/ELyzMG58OX1QYkhpvSQWTLBc+sOcmMPCNqOc/BGNbhdZwYvoCAY91ropcjaej6sXx6+z19whcQw== X-OriginatorOrg: hotmail.com X-MS-Exchange-CrossTenant-Network-Message-Id: cf3c1a65-0ae1-4c95-57c9-08d8603161c9 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Sep 2020 02:27:29.6585 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-AuthSource: PU1APC01FT010.eop-APC01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PU1APC01HT142 Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 02:27:40 -0000 ------=_001_NextPart248718713580_=---- Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 V2h5IG5vdCBnZXQgdGhlIGludGVycHJldGF0aW9uIGZyb20gNm1hbiBXRyBzaW5jZSBSRkM4MjAw IGlzIG9uZSBvZiB0aGUgb3V0Y29tZXMgb2YgNm1hbiBXRz8NCg0KQmVzdCBSZWdhcmRzLA0KWmhl bnFpYW5nIExpDQoNCg0KbGlfemhlbnFpYW5nQGhvdG1haWwuY29tDQogDQpGcm9tOiBFcmlrIEts aW5lDQpEYXRlOiAyMDIwLTA5LTI0IDA4OjIyDQpUbzogQWx2YXJvIFJldGFuYQ0KQ0M6IFNQUklO RyBXRzsgc3ByaW5nLWNoYWlyczsgQnJ1bm8gRGVjcmFlbmU7IFRoZSBJRVNHOyBKb2VsIEhhbHBl cm47IGRyYWZ0LWlldGYtc3ByaW5nLXNydjYtbmV0d29yay1wcm9ncmFtbWluZw0KU3ViamVjdDog UmU6IFtzcHJpbmddIEFsdmFybyBSZXRhbmEncyBEaXNjdXNzIG9uIGRyYWZ0LWlldGYtc3ByaW5n LXNydjYtbmV0d29yay1wcm9ncmFtbWluZy0yMDogKHdpdGggRElTQ1VTUyBhbmQgQ09NTUVOVCkN Cig1KSBUaGlzIHBvaW50IGlzIGZvciB0aGUgSUVTRyB0byBkaXNjdXNzLg0KDQrCpzQuMTYuMS4y Og0KDQogICAgICBUaGUgRW5kLCBFbmQuWCBhbmQgRW5kLlQgYmVoYXZpb3JzIHdpdGggUFNQIGRv IG5vdCBjb250cmF2ZW5lDQogICAgICBTZWN0aW9uIDQgb2YgW1JGQzgyMDBdIGJlY2F1c2UgdGhl IGRlc3RpbmF0aW9uIGFkZHJlc3Mgb2YgdGhlDQogICAgICBpbmNvbWluZyBwYWNrZXQgaXMgdGhl IGFkZHJlc3Mgb2YgdGhlIG5vZGUgZXhlY3V0aW5nIHRoZSBiZWhhdmlvci4NCg0KVGhlIHNwcmlu ZyBXRydzIGludGVycHJldGF0aW9uIG9mIHJmYzgyMDAgd2FzIGEgY2VudHJhbCBwb2ludCBpbiB0 aGUgYXBwZWFsDQpwcmVzZW50ZWQgYWdhaW5zdCB0aGUgV0cgY29uc2Vuc3VzIG9uIHRoaXMgZG9j dW1lbnQuICBUaGUgdGV4dCBhYm92ZSwgSQ0KYmVsaWV2ZSwgcmVmbGVjdHMgdGhhdCBjb25zZW5z dXMuDQoNCkhvd2V2ZXIsIGdpdmVuIHRoYXQgdGhlIGRvY3VtZW50IHJlbGllcyBvbiB0aGUgc3By aW5nIFdHJ3MgaW50ZXJwcmV0YXRpb24gb2YNCnJmYzgyMDAsIEkgdGhpbmsgaXQgd291bGQgYmUg YmV0dGVyIGlmIHRoZSB0ZXh0IGlzIGV4cGxpY2l0Lg0KDQpTdWdnZXN0aW9uOiB0byBhZGQgYXQg dGhlIGVuZCBvZiB0aGUgcGFyYWdyYXBoPg0KDQogICBUaGlzIGNvbmNsdXNpb24gcmVwcmVzZW50 cyB0aGUgY29uc2Vuc3VzIGludGVycHJldGF0aW9uIG9mIHRoZSBzcHJpbmcgV0cuDQoNClRoaXMg c2VlbXMgbGlrZSBhbiBpbXBvcnRhbnQgLS0gYW5kIGVudGlyZWx5IHJlYXNvbmFibGUgLS0gdGhp bmcgdG8gbm90ZS4NCg== ------=_001_NextPart248718713580_=---- Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable body { line-height: 1.5; }blockquote { margin-top: 0px; margin-bottom:= 0px; margin-left: 0.5em; }div.FoxDiv20200924102256324439 { }body { font-si= ze: 10.5pt; font-family: =E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91; color: rgb(0= , 0, 0); line-height: 1.5; }=0A=
    Why not get the interpretation from 6man WG since RFC8200= is one of the outcomes of 6man WG?
    =0A=

    Best Regards,
    Zhenqiang Li
    =0A=
    li_zhenqiang@hotmail.com
    =0A=
     
    (5) This point is for the IESG to discuss.
    =0A=
    =0A= =C2=A7    4.16= .1.2:
    =0A=
    =0A=       The End, End.X and End.T behaviors with PSP do not con= travene
    =0A=       Section 4 of [RFC8200] because the destination address= of the
    =0A=       incoming packet is the address of the node executing t= he behavior.
    =0A=
    =0A= The spring WG's interpretation of rfc8200 was a central point in the appeal=
    =0A= presented against the WG consensus on this document.  The text above, = I
    =0A= believe, reflects that consensus.
    =0A=
    =0A= However, given that the document relies on the spring WG's interpretation o= f
    =0A= rfc8200, I think it would be better if the text is explicit.
    =0A=
    =0A= Suggestion: to add at the end of the paragraph>
    =0A=
    =0A=    This conclusion represents the consensus interpretation of the= spring WG.

    This seems like an importan= t -- and entirely reasonable -- thing to note.
    =0A=
    =0A= = ------=_001_NextPart248718713580_=------ From nobody Wed Sep 23 23:41:03 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 98A883A0538; Wed, 23 Sep 2020 23:40:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Erik Kline via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Erik Kline Message-ID: <160092965760.9540.7968486706230780232@ietfa.amsl.com> Date: Wed, 23 Sep 2020 23:40:57 -0700 Archived-At: Subject: [spring] Erik Kline's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 06:40:58 -0000 Erik Kline has entered the following ballot position for draft-ietf-spring-srv6-network-programming-20: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I support Alvaro's and others' discuss points. I have only a few points that I think are easily cleared. [ section 3.2 ] * I'm a bit concerned about this first example, as it might give the mistaken impression that fc00::/7 is free for anyone to carve up as they wish (I say this regardless of what this operator may or may not have done). Per 4193, operators are supposed to generate random /48s from fd00::/8. I think this is easily corrected though, and I'd suggest: OLD: ..... The provider historically deployed IPv6 and assigned infrastructure addresses from a portion of the fc00::/7 prefix. They further subdivided the prefix into three /48 prefixes (Country X, Country Y, Country Z) to support their SRv6 infrastructure. From those /48 prefixes each router is assigned a /64 prefix from which all SIDs of that router are allocated. NEW: ..... The provider historically deployed IPv6 and assigned infrastructure addresses from ULA space [RFC 4193]. They specifically allocated three /48 prefixes (Country X, Country Y, Country Z) to support their SRv6 infrastructure. From those /48 prefixes each router was assigned a /64 prefix from which all SIDs of that router are allocated. [ section 4.16.2 ] * I'm not sure I understand what the value of specifying USP is. This looks to me like an implementation detail and seems unnecessary. In all cases where the S03 code block is entered it's the processing of the remainder of the inner packet that's important, I would think. I guess, what's the value of specifying the way in which an implementation can begin to process the next header? Is this for chained SRHs and thus resubmitting the inner SRH to the same SID processing (8200 says that the RH 'should appear at most once', but that's as strong as the text gets)? [ section 4.16.3 ] * This too seems like an implementation detail, and it's not clear what it's adding to the document. But I must be misunderstanding something. [ section 7 ] * What flow label is included in hashing where End.DX4 is concerned? If it's the flow label of the outermost IPv6 header, then the same question comes to mind for End.X and End.DX6; I'd assumed it would be the inner packet's flow label (and src/dst addresses) that would factor into the flow hashing. [ section 8 ] * Of what value to the ingress node is knowledge of USP or USD behaviour at the terminus? That still seems like exposing an implementation detail. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- [[ comments ]] [ section 3.2 ] * First, thanks for adding this section; I think it does help. * Second, thanks for clarifying that Endpoint Behaviour cannot be inferred from FUNCT; much improved. [[ questions ]] [ section 4 ] * When an SRv6-capable node receives a packet destined to a locally instantiated SID, doesn't it also apply RFC 8754 processing (as well as RFC 8200)? [ section 4.9 ] * Can an End.DX2 sID be associated with LAG'd set of outgoing interfaces J, analogous to the "interface bundle" description for End.X processing? [[ nits ]] [ section 6 ] * "pair of traffic counter" -> "pair of traffic counters" From nobody Thu Sep 24 00:43:43 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A5FB93A08DB; Thu, 24 Sep 2020 00:43:38 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <160093341821.23932.733284311315470053@ietfa.amsl.com> Date: Thu, 24 Sep 2020 00:43:38 -0700 Archived-At: Subject: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 07:43:39 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-spring-srv6-network-programming-20: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- The current requirement that IANA-assigned SRv6 Endpoint Behavior codepoints are used, with no range reserved for local assignment, seems to be inviting codepoint squatting from the nominally reserved range. Why is there an absolute requirement for registration (even FCFS) without ranges for local or experimental use? (What are the various reserved ranges reserved for?) The (normative) pseudocode does not seem to handle the case when the SRH is omitted for the degenerate case where there is only a single segment, or for the PSP flavor. The pseudocode for the PSP and USP procedures seem incorrect -- Hdr Ext Len is measured in units of 8 octets, and does not include the first 8 octets of the extension header, but Payload Length is measured in octets. Literally decreasing the Payload Length by the Hdr Ext Len value will produce a malformed IPv6 packet. If "PSP operation is deterministically controlled by the SR Source Node", why do we need to define behavior codepoints that (for example) use both PSP and USP? I don't see how there is full determinism in this case while being different from the "PSP only" flavor. There are numerous factual errors and un/under-specified protocol behavior (see COMMENT), including: how to set the outer Hop Limit (multiple instances), the order of segments in the SRH, specification of headend behavior by reference to informal example, L2 frame en/decapsulation procedures, and the "Opaque" note for endpoint behavior 65535. A discussion topic, which may or may not entail changes to this document: RFC 8200 notes that specifications of new extension headers need to indicate their ordering constraints with respect to the other extension headers, but RFC 8754 makes no such indications. Are there in practice ordering constraints that we should attempt to document? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- I note that this document references draft-filsfils-spring-srv6-net-pgm-illustration, which uses the IPv4 CIDR 20/8 in examples instead of addresses from the RFC 5737 range. It would be disappointing to have a PS refer to a draft that squats on the IPv4 namespace in such a manner. Abstract, Introduction This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization (Service Level Agreements). I don't understand what the parenthetical is intending to convey. Section 2 The following terms used within this document are defined in [RFC8402]: Segment Routing, SR Domain, Segment ID (SID), SRv6, SRv6 SID, SR Policy, Prefix SID, and Adjacency SID. [RFC 8402 spells it Prefix-SID (with hyphen) and Adj-SID.] Section 3 The text allegedly reproduced from RFC 8754 §4.3 differs in case and hyphenation. Section 3.1 This document defines an SRv6 SID as consisting of LOC:FUNCT:ARG, where a locator (LOC) is encoded in the L most significant bits of the SID, followed by F bits of function (FUNCT) and A bits of arguments (ARG). L, the locator length, is flexible, and an operator is free to use the locator length of their choice. F and A may be any value as long as L+F+A <= 128. When L+F+A is less than 128 then the remaining bits of the SID MUST be zero. Why does A have to be a fixed value; can't it safely be a function of F (even if we exclude things like huffman coding for F)? An SRv6 Segment Endpoint Behavior may require additional information for its processing (e.g. related to the flow or service). This information may be encoded in the ARG bits of the SID. (Assuming that it can be sufficiently compactly encoded?) The ARG value of a routed SID SHOULD remain constant among packets in a given flow. Varying ARG values among packets in a flow may result (Thus limiting the type of information that can be represented in the ARG?) Section 3.2 SIDs. The provider historically deployed IPv6 and assigned infrastructure addresses from a portion of the fc00::/7 prefix. They further subdivided the prefix into three /48 prefixes (Country X, Country Y, Country Z) to support their SRv6 infrastructure. From those /48 prefixes each router is assigned a /64 prefix from which all SIDs of that router are allocated. This is not the language I would have expected for use of the ULA address range. It looks like this may be related to Erik Kline's Discuss point... IPv6 address consumption in both these examples is minimal, representing one billionth and one millionth of the assigned address space, respectively. I'm not sure I understand the calculation that produced these values. An SR Source Node cannot infer the behavior by examination of the FUNCT value of a SID. Therefore, the SRv6 Endpoint Behavior codepoint is advertised along with the SID in the control plane. These two sentences feel a little out of place in this spot, occurring after previous discussion that the endpoint behavior codepoint is advertised in the control plane. o At Router 3, within the locator 2001:db8:bbbb:3::/64, network operator or the router performs dynamic assignment for: nit: missing article ("the network operator"). * Function 100 associated with the behavior End.X (Endpoint with cross-connect) between router 3 and its connected neighbor router, for example Router 4. This function is encoded as 16-bit value and has no arguments. Please clarify that "function 100" is a hex literal. I also suggest noting clearly at the start of the example that F is 16 and A is 0. * Function 101 associated with the behavior End.X (Endpoint with cross-connect) between router 3 and its connected neighbor router, for example Router 2. This function is encoded as 16-bit value and has no arguments. F is a constant for the SR domain; saying it at each SID assignment is misleading. [same note about hex for 101] Section 4 The list is not exhaustive. In practice, any function can be attached to a local SID: e.g. a node N can bind a SID to a local VM or container which can apply any complex processing on the packet. Yes, but it can't advertise the behavior corresponding to that function without a codepoint. Section 4.1.1 When processing the Upper-layer Header of a packet matching a FIB entry locally instantiated as an SRv6 End SID, if Upper-layer Header processing is allowed by local configuration (e.g. ICMPv6), then nit: the parenthetical is placed so as to apply to "local configuration", which doesn't really make sense; I presume the intent is to say that upper-layer header processing is allowed *for that upper-layer protocol*. Also, comma after "e.g.". problem message to the Source Address and discard the packet. Error code 4 (SR Upper-layer Header Error) and Pointer set to the offset of the upper-layer header. nit: this is not a complete sentence. Section 4.2 It is the SRv6 instantiation of an Adjacency-SID [RFC8402] and it is required to express any traffic-engineering policy. This text reads as if End.X specifically is required for TE, which does not seem correct to me. Section 4.4, 4.5 This is equivalent to the per-CE VPN label in MPLS [RFC4364]. The phrase "per-CE VPN" does not appear in RFC 4364. Section 4.5 S05. If the End.DX4 SID is bound to an array of L3 adjacencies, then one entry of the array is selected based on the hash of the packet's header Section 7. nit: I suggest "(see Section 7)" to match section 4.4. Section 4.6, 4.7 is required. This is equivalent to the per-VRF VPN label in MPLS [RFC4364]. The phrase "per-VRF VPN" does not appear in RFC 4364. (A similar comment applies to Section 4.8 as well.) Note that an End.DT6 may be defined for the main IPv6 table in which case and End.DT6 supports the equivalent of an IPv6inIPv6 nit: s/and/an/ Section 4.7 The "Endpoint with decapsulation and specific IPv4 table lookup" behavior (End.DT4 for short) is a variant of the End behavior. nit: variant of End.T, just like End.DT6, no? Section 4.9 S04. An End.DX2 behavior could be customized to expect a specific IEEE header (e.g. VLAN tag) and rewrite the egress IEEE header before forwarding on the outgoing interface. Would this customized behavior require a new codepoint? Similarly for End.DX2V (Section 4.10) Section 4.10 S04. Remove the outer IPv6 Header with all its extension headers, lookup the exposed VLANs in L2 table T, and forward via the matched table entry. Just to check my understanding: the "exposed VLANs" (plural?!) are in the Ethernet header of the packet that we are left with after removing the outer IPv6 header, right? S01. IANA has allocated the Internet Protocol number 143 to Ethernet (see Section 10.1). This seems like a copy/paste leftover from End.DX2 -- we don't mention 143 in this section. Section 4.12 Two of the applications of the End.DT2M behavior are the EVPN Bridging of broadcast, unknown and multicast (BUM) traffic with Ethernet Segment Identifier (ESI) filtering and the EVPN ETREE use- cases. Are there references for either/both of these? S04. Remove the IPv6 header and all its extension headers nit: the rest of the document uses "Remove the outer IPv6 header with all its extension headers". S06. Forward via all L2 OIFs excluding the one specified in Arg.FE2 nit: s/one/ones/ Arg.FE2 is encoded in the SID as an (k*x)-bit value. These bits represent a list of up to k OIFs, each identified with an x-bit value. Values k and x are defined on a per End.DT2M SID basis. The interface identifier 0 indicates an empty entry in the interface list. (editorial) rather than have to come up with the concept of an "empty entry" in the interface list, I would probably just say that the identifier 0 is reserved and is ignored when doing the exclusion of OIFs. I also think we need to say that the order and identifier assignment of elements of the interface list (that is, what the x-bit values index into) is under the local control of N, but has to remain stable as long as SIDs are advertised that list members of the list in ARG. (There is otherwise a great deal of freedom in assignment since the values are only consumed by the node that advertises them.) Section 4.13 It's probably worth calling out the MTU considerations of pushing the new IPv6 header+SRH and tunneling the packets. (I know we reference 2473 already, but the MTU is pretty important.) S17. The Payload Length, Traffic Class and Next-Header fields are set as per [RFC2473]. The Flow Label is computed as per [RFC6437]. How is the Hop Limit set for the outer header? (I assume §6.3 of RFC 2473, but given that you provide a reference for all the other fields, it seems like an omission to not mention Hop Limit as well.) Section 4.14 The SRH MAY be omitted when the SRv6 Policy only contains one segment and there is no need to use any flag, tag or TLV. If this is the case does it matter if I use End.B6.Encaps or End.B6.Encaps.Red? Section 4.16 I don't think I understand what it would mean for a specific SID to support the multiple flavors "in combinations". Section 4.16.1.2 A penultimate SR Segment Endpoint Node is one that, as part of the SID processing, copies the last SID from the SRH into the IPv6 Destination Address and decrements Segments Left value from one to zero. I think technically it copies the first SID from the SRH (SRH.Segment List[0]), which is the last SID from the SR Policy. Also, nit: "the" for "the Segments Left value". S14.2. Update the Next Header field in the preceding header to the Next Header value of the SRH nit: personally, I would write "from the SRH", since "next header value of the SRH" is very close to "next header value of SRH", i.e., 43. As a reminder, [RFC8754] defines in section 5 the SR Deployment Model within the SR Domain [RFC8402]. Within this framework, the Authentication Header (AH) is not used to secure the SRH as described in Section 7.5 of [RFC8754]. I strongly recommend adding another sentence clarifying why this is relevant to discussion of removing an extension header from the packet. Section 5 This list can be expanded in case any new functionality requires it. How? By an RFC that Updates: this one? Section 5.x I agree with the directorate reviewer that the protocol behavior should be written out explicitly, without reference to the handling of example packet(s). Section 5.1 S03. Set outer payload length, traffic class and flow label What about the outer Hop Limit? S03: As described in [RFC6437] (IPv6 Flow Label Specification) Why is this all the way at the bottom of the section instead of included with the corresponding content? Section 5.3 The encapsulating node MUST remove the preamble or frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate the preamble or FCS before forwarding Ethernet frame. "or"? I get to choose one or the other? It's okay to only put back a preamble but no FCS (or vice versa)? Section 6 traffic that matched that SID and was processed correctly. The retrieval of these counters via MIB, NETCONF/YANG or any other means is outside the scope of this document. (editorial) a MIB is an abstract data structure (likewise a YANG module); information might be retrieved *from* it but not *via* it. For *via*, that would be SNMP, NETCONF, and/or RESTCONF. Section 8.1 Does it make sense to reference RFCs 8491, 8476, 8841, etc. for advertising MSD via IGP? In particular, the SR source (e.g., H.Encaps), intermediate endpoint (e.g., End, End.X) and final endpoint (e.g., End.DX4, End.DT6) behaviors. [...] This is not a complete sentence, and I really have no idea what verb was intended. Section 8.2, 8.3 Can we get references for the BGP variants here and their usage for signaling SRv6 capabilities and (SID,behavior codepoint) pairs? Section 9 I would really like to have a stronger reference to Section 5 of RFC 8754 where the conceptual model of a SR Domain as a single system, where all packets in the domain are encapsulated using IPv6 headers [with SIDs as SA/DA]. The part in brackets is not spelled out very clearly and could well be expounded upon in this document. I can write up some (very ad hoc) ideas for what I had in mind, which you are welcome to adopt but expected to wordsmith/edit appropriately: % Section 5 of [RFC8754] describes the SR deployment model and the % baseline requirements for securing the SR Domain. In many ways the SR % Domain is analogous to an MPLS domain -- it's a tightly controlled % system where packet processing is controlled by a list (or stack) of % opaque identifiers that, by and large, only have defined semantics in % the context of the node that receives and processes the packet when % that identifier is "topmost" or "current". Experience in securing and % operating MPLS domains should be readily transferrable to SRv6 % domains, in ensuring that all traffic within the network is tightly % controlled, with all external inputs being properly encapsulated (for % SRv6, by an IPv6 header usually with SRH; for MPLS, by the label % stack). The dedicated format for the MPLS label stack and label % identifiers makes a clear mechanical separation between "internal" and % "external" identifiers. In contrast, SRv6 uses SIDs for the internal % identifiers, which have format and operation of IPv6 addresses. While % this lets SRv6 benefit from IP longest-prefix routing and thus the % structure of SID values, it also means that there is not a crisp % mechanical separation between "internal" and "external" identifiers. % As such, care and rigor in annotating which IPv6 addresses/headers are % internal vs external is required in order to maintain the integrity % and security of the SRv6 domain. There might also be room for discussion (in the main body of the document) of how the various decapsulation procedures occur precisely when the packet is leaving the SR Domain. Having the ARG structure specified as part of the behavior codepoint registration means that a node that can apply that SID can also spoof the ARG to force a different (e.g.) outgoing interface list. Specifically, it gives the attacker a degree of freedom greater than just the SID behaviors that the node advertises. The HMAC TLV would mitigate this to the extent that it limits what SIDs the node in question is allowed to apply and what changes can be made on-path. services. Additionally, [RFC8754] defines an HMAC TLV permitting SR Endpoint Nodes in the SR domain to verify that the SRH applied to a packet was selected by an authorized party and to ensure that the segment list is not modified after generation, regardless of the number of segments in the segment list. When enabled by local I suggest adding a sentence similar to "(This does, however, require that the segment list, and thus, the SRH is present in the packet; the optional ability to elide the SRH when there is only a single segment and no flags, tags, or TLVs needed inherently excludes the protection of the HMAC TLV.)" Section 10.1 definition: The value 143 in the Next Header field of an IPv6 header or any extension header indicates that the payload is an Ethernet [IEEE.802.3_2018]. nit: is there a missing word here ("frame"?)? From nobody Thu Sep 24 00:52:14 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id BCDDD3A08EC; Thu, 24 Sep 2020 00:52:12 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-spring-srv6-network-programming@ietf.org, spring-chairs@ietf.org, spring@ietf.org, Bruno Decraene , Joel Halpern , jmh@joelhalpern.com X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <160093393224.24080.1727360124332839831@ietfa.amsl.com> Date: Thu, 24 Sep 2020 00:52:12 -0700 Archived-At: Subject: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 07:52:13 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-spring-srv6-network-programming-20: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- [edited to remove nonsensical point that had crept in about the SRH being a new extension header; it's "just" a routing header] The current requirement that IANA-assigned SRv6 Endpoint Behavior codepoints are used, with no range reserved for local assignment, seems to be inviting codepoint squatting from the nominally reserved range. Why is there an absolute requirement for registration (even FCFS) without ranges for local or experimental use? (What are the various reserved ranges reserved for?) The (normative) pseudocode does not seem to handle the case when the SRH is omitted for the degenerate case where there is only a single segment, or for the PSP flavor. The pseudocode for the PSP and USP procedures seem incorrect -- Hdr Ext Len is measured in units of 8 octets, and does not include the first 8 octets of the extension header, but Payload Length is measured in octets. Literally decreasing the Payload Length by the Hdr Ext Len value will produce a malformed IPv6 packet. If "PSP operation is deterministically controlled by the SR Source Node", why do we need to define behavior codepoints that (for example) use both PSP and USP? I don't see how there is full determinism in this case while being different from the "PSP only" flavor. There are numerous factual errors and un/under-specified protocol behavior (see COMMENT), including: how to set the outer Hop Limit (multiple instances), the order of segments in the SRH, specification of headend behavior by reference to informal example, L2 frame en/decapsulation procedures, and the "Opaque" note for endpoint behavior 65535. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- I note that this document references draft-filsfils-spring-srv6-net-pgm-illustration, which uses the IPv4 CIDR 20/8 in examples instead of addresses from the RFC 5737 range. It would be disappointing to have a PS refer to a draft that squats on the IPv4 namespace in such a manner. Abstract, Introduction This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization (Service Level Agreements). I don't understand what the parenthetical is intending to convey. Section 2 The following terms used within this document are defined in [RFC8402]: Segment Routing, SR Domain, Segment ID (SID), SRv6, SRv6 SID, SR Policy, Prefix SID, and Adjacency SID. [RFC 8402 spells it Prefix-SID (with hyphen) and Adj-SID.] Section 3 The text allegedly reproduced from RFC 8754 §4.3 differs in case and hyphenation. Section 3.1 This document defines an SRv6 SID as consisting of LOC:FUNCT:ARG, where a locator (LOC) is encoded in the L most significant bits of the SID, followed by F bits of function (FUNCT) and A bits of arguments (ARG). L, the locator length, is flexible, and an operator is free to use the locator length of their choice. F and A may be any value as long as L+F+A <= 128. When L+F+A is less than 128 then the remaining bits of the SID MUST be zero. Why does A have to be a fixed value; can't it safely be a function of F (even if we exclude things like huffman coding for F)? An SRv6 Segment Endpoint Behavior may require additional information for its processing (e.g. related to the flow or service). This information may be encoded in the ARG bits of the SID. (Assuming that it can be sufficiently compactly encoded?) The ARG value of a routed SID SHOULD remain constant among packets in a given flow. Varying ARG values among packets in a flow may result (Thus limiting the type of information that can be represented in the ARG?) Section 3.2 SIDs. The provider historically deployed IPv6 and assigned infrastructure addresses from a portion of the fc00::/7 prefix. They further subdivided the prefix into three /48 prefixes (Country X, Country Y, Country Z) to support their SRv6 infrastructure. From those /48 prefixes each router is assigned a /64 prefix from which all SIDs of that router are allocated. This is not the language I would have expected for use of the ULA address range. It looks like this may be related to Erik Kline's Discuss point... IPv6 address consumption in both these examples is minimal, representing one billionth and one millionth of the assigned address space, respectively. I'm not sure I understand the calculation that produced these values. An SR Source Node cannot infer the behavior by examination of the FUNCT value of a SID. Therefore, the SRv6 Endpoint Behavior codepoint is advertised along with the SID in the control plane. These two sentences feel a little out of place in this spot, occurring after previous discussion that the endpoint behavior codepoint is advertised in the control plane. o At Router 3, within the locator 2001:db8:bbbb:3::/64, network operator or the router performs dynamic assignment for: nit: missing article ("the network operator"). * Function 100 associated with the behavior End.X (Endpoint with cross-connect) between router 3 and its connected neighbor router, for example Router 4. This function is encoded as 16-bit value and has no arguments. Please clarify that "function 100" is a hex literal. I also suggest noting clearly at the start of the example that F is 16 and A is 0. * Function 101 associated with the behavior End.X (Endpoint with cross-connect) between router 3 and its connected neighbor router, for example Router 2. This function is encoded as 16-bit value and has no arguments. F is a constant for the SR domain; saying it at each SID assignment is misleading. [same note about hex for 101] Section 4 The list is not exhaustive. In practice, any function can be attached to a local SID: e.g. a node N can bind a SID to a local VM or container which can apply any complex processing on the packet. Yes, but it can't advertise the behavior corresponding to that function without a codepoint. Section 4.1.1 When processing the Upper-layer Header of a packet matching a FIB entry locally instantiated as an SRv6 End SID, if Upper-layer Header processing is allowed by local configuration (e.g. ICMPv6), then nit: the parenthetical is placed so as to apply to "local configuration", which doesn't really make sense; I presume the intent is to say that upper-layer header processing is allowed *for that upper-layer protocol*. Also, comma after "e.g.". problem message to the Source Address and discard the packet. Error code 4 (SR Upper-layer Header Error) and Pointer set to the offset of the upper-layer header. nit: this is not a complete sentence. Section 4.2 It is the SRv6 instantiation of an Adjacency-SID [RFC8402] and it is required to express any traffic-engineering policy. This text reads as if End.X specifically is required for TE, which does not seem correct to me. Section 4.4, 4.5 This is equivalent to the per-CE VPN label in MPLS [RFC4364]. The phrase "per-CE VPN" does not appear in RFC 4364. Section 4.5 S05. If the End.DX4 SID is bound to an array of L3 adjacencies, then one entry of the array is selected based on the hash of the packet's header Section 7. nit: I suggest "(see Section 7)" to match section 4.4. Section 4.6, 4.7 is required. This is equivalent to the per-VRF VPN label in MPLS [RFC4364]. The phrase "per-VRF VPN" does not appear in RFC 4364. (A similar comment applies to Section 4.8 as well.) Note that an End.DT6 may be defined for the main IPv6 table in which case and End.DT6 supports the equivalent of an IPv6inIPv6 nit: s/and/an/ Section 4.7 The "Endpoint with decapsulation and specific IPv4 table lookup" behavior (End.DT4 for short) is a variant of the End behavior. nit: variant of End.T, just like End.DT6, no? Section 4.9 S04. An End.DX2 behavior could be customized to expect a specific IEEE header (e.g. VLAN tag) and rewrite the egress IEEE header before forwarding on the outgoing interface. Would this customized behavior require a new codepoint? Similarly for End.DX2V (Section 4.10) Section 4.10 S04. Remove the outer IPv6 Header with all its extension headers, lookup the exposed VLANs in L2 table T, and forward via the matched table entry. Just to check my understanding: the "exposed VLANs" (plural?!) are in the Ethernet header of the packet that we are left with after removing the outer IPv6 header, right? S01. IANA has allocated the Internet Protocol number 143 to Ethernet (see Section 10.1). This seems like a copy/paste leftover from End.DX2 -- we don't mention 143 in this section. Section 4.12 Two of the applications of the End.DT2M behavior are the EVPN Bridging of broadcast, unknown and multicast (BUM) traffic with Ethernet Segment Identifier (ESI) filtering and the EVPN ETREE use- cases. Are there references for either/both of these? S04. Remove the IPv6 header and all its extension headers nit: the rest of the document uses "Remove the outer IPv6 header with all its extension headers". S06. Forward via all L2 OIFs excluding the one specified in Arg.FE2 nit: s/one/ones/ Arg.FE2 is encoded in the SID as an (k*x)-bit value. These bits represent a list of up to k OIFs, each identified with an x-bit value. Values k and x are defined on a per End.DT2M SID basis. The interface identifier 0 indicates an empty entry in the interface list. (editorial) rather than have to come up with the concept of an "empty entry" in the interface list, I would probably just say that the identifier 0 is reserved and is ignored when doing the exclusion of OIFs. I also think we need to say that the order and identifier assignment of elements of the interface list (that is, what the x-bit values index into) is under the local control of N, but has to remain stable as long as SIDs are advertised that list members of the list in ARG. (There is otherwise a great deal of freedom in assignment since the values are only consumed by the node that advertises them.) Section 4.13 It's probably worth calling out the MTU considerations of pushing the new IPv6 header+SRH and tunneling the packets. (I know we reference 2473 already, but the MTU is pretty important.) S17. The Payload Length, Traffic Class and Next-Header fields are set as per [RFC2473]. The Flow Label is computed as per [RFC6437]. How is the Hop Limit set for the outer header? (I assume §6.3 of RFC 2473, but given that you provide a reference for all the other fields, it seems like an omission to not mention Hop Limit as well.) Section 4.14 The SRH MAY be omitted when the SRv6 Policy only contains one segment and there is no need to use any flag, tag or TLV. If this is the case does it matter if I use End.B6.Encaps or End.B6.Encaps.Red? Section 4.16 I don't think I understand what it would mean for a specific SID to support the multiple flavors "in combinations". Section 4.16.1.2 A penultimate SR Segment Endpoint Node is one that, as part of the SID processing, copies the last SID from the SRH into the IPv6 Destination Address and decrements Segments Left value from one to zero. I think technically it copies the first SID from the SRH (SRH.Segment List[0]), which is the last SID from the SR Policy. Also, nit: "the" for "the Segments Left value". S14.2. Update the Next Header field in the preceding header to the Next Header value of the SRH nit: personally, I would write "from the SRH", since "next header value of the SRH" is very close to "next header value of SRH", i.e., 43. As a reminder, [RFC8754] defines in section 5 the SR Deployment Model within the SR Domain [RFC8402]. Within this framework, the Authentication Header (AH) is not used to secure the SRH as described in Section 7.5 of [RFC8754]. I strongly recommend adding another sentence clarifying why this is relevant to discussion of removing an extension header from the packet. Section 5 This list can be expanded in case any new functionality requires it. How? By an RFC that Updates: this one? Section 5.x I agree with the directorate reviewer that the protocol behavior should be written out explicitly, without reference to the handling of example packet(s). Section 5.1 S03. Set outer payload length, traffic class and flow label What about the outer Hop Limit? S03: As described in [RFC6437] (IPv6 Flow Label Specification) Why is this all the way at the bottom of the section instead of included with the corresponding content? Section 5.3 The encapsulating node MUST remove the preamble or frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate the preamble or FCS before forwarding Ethernet frame. "or"? I get to choose one or the other? It's okay to only put back a preamble but no FCS (or vice versa)? Section 6 traffic that matched that SID and was processed correctly. The retrieval of these counters via MIB, NETCONF/YANG or any other means is outside the scope of this document. (editorial) a MIB is an abstract data structure (likewise a YANG module); information might be retrieved *from* it but not *via* it. For *via*, that would be SNMP, NETCONF, and/or RESTCONF. Section 8.1 Does it make sense to reference RFCs 8491, 8476, 8841, etc. for advertising MSD via IGP? In particular, the SR source (e.g., H.Encaps), intermediate endpoint (e.g., End, End.X) and final endpoint (e.g., End.DX4, End.DT6) behaviors. [...] This is not a complete sentence, and I really have no idea what verb was intended. Section 8.2, 8.3 Can we get references for the BGP variants here and their usage for signaling SRv6 capabilities and (SID,behavior codepoint) pairs? Section 9 I would really like to have a stronger reference to Section 5 of RFC 8754 where the conceptual model of a SR Domain as a single system, where all packets in the domain are encapsulated using IPv6 headers [with SIDs as SA/DA]. The part in brackets is not spelled out very clearly and could well be expounded upon in this document. I can write up some (very ad hoc) ideas for what I had in mind, which you are welcome to adopt but expected to wordsmith/edit appropriately: % Section 5 of [RFC8754] describes the SR deployment model and the % baseline requirements for securing the SR Domain. In many ways the SR % Domain is analogous to an MPLS domain -- it's a tightly controlled % system where packet processing is controlled by a list (or stack) of % opaque identifiers that, by and large, only have defined semantics in % the context of the node that receives and processes the packet when % that identifier is "topmost" or "current". Experience in securing and % operating MPLS domains should be readily transferrable to SRv6 % domains, in ensuring that all traffic within the network is tightly % controlled, with all external inputs being properly encapsulated (for % SRv6, by an IPv6 header usually with SRH; for MPLS, by the label % stack). The dedicated format for the MPLS label stack and label % identifiers makes a clear mechanical separation between "internal" and % "external" identifiers. In contrast, SRv6 uses SIDs for the internal % identifiers, which have format and operation of IPv6 addresses. While % this lets SRv6 benefit from IP longest-prefix routing and thus the % structure of SID values, it also means that there is not a crisp % mechanical separation between "internal" and "external" identifiers. % As such, care and rigor in annotating which IPv6 addresses/headers are % internal vs external is required in order to maintain the integrity % and security of the SRv6 domain. There might also be room for discussion (in the main body of the document) of how the various decapsulation procedures occur precisely when the packet is leaving the SR Domain. Having the ARG structure specified as part of the behavior codepoint registration means that a node that can apply that SID can also spoof the ARG to force a different (e.g.) outgoing interface list. Specifically, it gives the attacker a degree of freedom greater than just the SID behaviors that the node advertises. The HMAC TLV would mitigate this to the extent that it limits what SIDs the node in question is allowed to apply and what changes can be made on-path. services. Additionally, [RFC8754] defines an HMAC TLV permitting SR Endpoint Nodes in the SR domain to verify that the SRH applied to a packet was selected by an authorized party and to ensure that the segment list is not modified after generation, regardless of the number of segments in the segment list. When enabled by local I suggest adding a sentence similar to "(This does, however, require that the segment list, and thus, the SRH is present in the packet; the optional ability to elide the SRH when there is only a single segment and no flags, tags, or TLVs needed inherently excludes the protection of the HMAC TLV.)" Section 10.1 definition: The value 143 in the Next Header field of an IPv6 header or any extension header indicates that the payload is an Ethernet [IEEE.802.3_2018]. nit: is there a missing word here ("frame"?)? 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UCwgVVNQLCBVU0QgYmUgZXhwYW5kZWQgaW4gdGhlIHNob3J0IGludHJvZHVjdGlvbiBvZiB0aGlz IHNlY3Rpb24gPw0KICAgIFtQQ10gQWNrLiBBZGRlZCBmb3IgbmV4dCByZXZpc2lvbi4NCg0KDQpF Vj4gT0sNCg0KICAgIC0tIFNlY3Rpb24gOCAtLQ0KDQogICAgVGhlIHVzdWFsIGxvY2F0aW9uIG9m IHRoZSBzZWN1cml0eSBjb25zaWRlcmF0aW9ucyBpcyBhZnRlciBhbGwgc3BlY2lmaWNhdGlvbiBz ZWN0aW9uLCBzbywgaXQgc2hvdWxkIGJlIGFmdGVyIHRoZSAnY29udHJvbCBwbGFuZScgc2VjdGlv bi4NCiAgICBbUENdIEFjay4gU2VjdGlvbiBtb3ZlZC4NCg0KDQpFVj4gT0sNCg0KDQoNCg== From nobody Thu Sep 24 04:01:05 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AF7923A0942; Thu, 24 Sep 2020 04:01:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org 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ESMTPSA id 249D51717E; Thu, 24 Sep 2020 13:00:42 +0200 (CEST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\)) From: iLya Varlashkin In-Reply-To: <30030d9a-e875-47c8-94b2-fc7531490e10@Spark> Date: Thu, 24 Sep 2020 12:00:41 +0100 Cc: spring-chairs@ietf.org, spring , draft-mirsky-spring-bfd@ietf.org, Greg Mirsky Content-Transfer-Encoding: quoted-printable Message-Id: <91C6A0F4-B64C-4D75-B409-ED1932DDA99C@nobulus.com> References: <30030d9a-e875-47c8-94b2-fc7531490e10@Spark> To: Jeff Tantsura X-Mailer: Apple Mail (2.3608.120.23.2.1) Archived-At: Subject: Re: [spring] IPR related to draft-mirsky-spring-bfd X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 11:01:05 -0000 +1, not aware of any IPR applicable to this document. > On 22 Sep 2020, at 22:45, Jeff Tantsura = wrote: >=20 > +1 , not aware of any IPR applicable.=20 >=20 > Cheers, > Jeff > On Sep 22, 2020, 12:10 PM -0700, Greg Mirsky , = wrote: >> Dear All, >> please note that I am not aware of any IPR that applies to this = document. >>=20 >> Regards, >> Greg=20 > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring From nobody Thu Sep 24 06:20:43 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 160E33A0A4F; Thu, 24 Sep 2020 06:20:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] 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h=From:To:CC:Subject:Date:References:In-Reply-To:From; b=HOxc4SqcoyjBckHF0Z1cuK8jABNKQapRYNaesrOnnzTpr2BwEjL6yMK64WIvtkz9I e1VSZEhv4YSZ7MktjiHwLcq3KMCYxmZb32yI5sp/H2Vr10KyI+hCd88M3W/jAzWeEQ Yixvi1GxVd6ucGUCoyMmJrkSOUu96/pkwsE1NFx4= Received: from MURIEL.ad.sei.cmu.edu (muriel.ad.sei.cmu.edu [147.72.252.47]) by korb.sei.cmu.edu (8.14.7/8.14.7) with ESMTP id 08ODKS8k032075; Thu, 24 Sep 2020 09:20:28 -0400 Received: from MORRIS.ad.sei.cmu.edu (147.72.252.46) by MURIEL.ad.sei.cmu.edu (147.72.252.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 24 Sep 2020 09:20:28 -0400 Received: from MORRIS.ad.sei.cmu.edu ([fe80::555b:9498:552e:d1bb]) by MORRIS.ad.sei.cmu.edu ([fe80::555b:9498:552e:d1bb%13]) with mapi id 15.01.1979.003; Thu, 24 Sep 2020 09:20:28 -0400 From: Roman Danyliw To: "Pablo Camarillo (pcamaril)" , The IESG CC: "draft-ietf-spring-srv6-network-programming@ietf.org" , "spring-chairs@ietf.org" , "spring@ietf.org" , Bruno Decraene , Joel Halpern Thread-Topic: Roman Danyliw's Discuss on draft-ietf-spring-srv6-network-programming-19: (with DISCUSS and COMMENT) Thread-Index: AQHWkERzyjixneZo/UivXsdtFR9Pk6l1WCGAgAJwFtA= Date: Thu, 24 Sep 2020 13:20:27 +0000 Message-ID: <59b404f1dcdc485485813b2b80376976@cert.org> References: <160071265366.14948.8163350323208659826@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.64.202.135] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Roman Danyliw's Discuss on draft-ietf-spring-srv6-network-programming-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 13:20:38 -0000 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Y3Rpb24gMy4yLiBUeXBvLiBzL2lzIG1pbmltdW0vaXMgbWluaW1hbC8gW1BDXSBBY2tpbmcgYm90 aC4gRml4ZWQgZm9yIG5leHQNCj4gbmV4dCByZXYuDQoNClRoYW5rcyBmb3IgYWxsIG9mIHRoZSBj aGFuZ2VzIGRlc2NyaWJlZCBhYm92ZS4NCg0KUmVnYXJkcywNClJvbWFuDQoNCg== From nobody Thu Sep 24 09:37:40 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id E7C8F3A10CD; Thu, 24 Sep 2020 09:37:37 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Brian Weis via Datatracker To: Cc: spring@ietf.org, draft-ietf-spring-srv6-network-programming.all@ietf.org, last-call@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <160096545789.2761.7901137068170504935@ietfa.amsl.com> Reply-To: Brian Weis Date: Thu, 24 Sep 2020 09:37:37 -0700 Archived-At: Subject: [spring] Secdir telechat review of draft-ietf-spring-srv6-network-programming-20 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 16:37:38 -0000 Reviewer: Brian Weis Review result: Ready I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. A new sentence was added to Security Considerations in version 20. I believe it, combined with the previous sentence, will help clueful developers understand that there may be a need to add HMAC processing even if there is no SRH header. Thanks. None of the other changes in the update appear to affect security considerations. From nobody Thu Sep 24 18:44:44 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A42A3A0A0B; Thu, 24 Sep 2020 18:44:43 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160099828292.1893.18338064442970960984@ietfa.amsl.com> Date: Thu, 24 Sep 2020 18:44:42 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-mpls-path-segment-03.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 01:44:43 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Path Segment in MPLS Based Segment Routing Network Authors : Weiqiang Cheng Han Li Mach(Guoyi) Chen Rakesh Gandhi Royi Zigler Filename : draft-ietf-spring-mpls-path-segment-03.txt Pages : 13 Date : 2020-09-24 Abstract: A Segment Routing (SR) path is identified by an SR segment list. Only the complete segment list can identify the end-to-end SR path, and a sub-set of segments from the segment list cannot distinguish one SR path from another as they may be partially congruent. SR path identification is a pre-requisite for various use-cases such as Performance Measurement (PM), bidirectional paths correlation, and end-to-end 1+1 path protection. In SR for MPLS data plane (SR-MPLS), the segment identifiers are stripped from the packet through label popping as the packet transits the network. This means that when a packet reaches the egress of the SR path, it is not possible to determine on which SR path it traversed the network. This document defines a new type of segment that is referred to as Path Segment, which is used to identify an SR path in an SR-MPLS network. When used, it is inserted by the ingress node of the SR path and immediately follows the last segment identifier in the segment list of the SR path. The Path Segment will not be popped off until it reaches the egress node of the SR path. The Path Segment then can be used by the egress node to implement SR path identification and correlation. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-mpls-path-segment/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-03 https://datatracker.ietf.org/doc/html/draft-ietf-spring-mpls-path-segment-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-mpls-path-segment-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Sep 25 03:19:40 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 391F53A1324; Fri, 25 Sep 2020 03:19:33 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160102917316.31205.3642675360462511634@ietfa.amsl.com> Date: Fri, 25 Sep 2020 03:19:33 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-nsh-sr-03.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 10:19:33 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Integration of Network Service Header (NSH) and Segment Routing for Service Function Chaining (SFC) Authors : James N Guichard Jeff Tantsura Filename : draft-ietf-spring-nsh-sr-03.txt Pages : 17 Date : 2020-09-25 Abstract: This document describes two application scenarios where Network Service Header (NSH) and Segment Routing (SR) can be deployed together to support Service Function Chaining (SFC) in an efficient manner while maintaining separation of the service and transport planes as originally intended by the SFC architecture. In both scenarios, SR is responsible for steering packets between SFFs along a given Service Function Path (SFP) while NSH is responsible for maintaining the integrity of the service plane, the SFC instance context, and any associated metadata. These application scenarios demonstrate that NSH and SR can work jointly and complement each other leaving the network operator with the flexibility to use whichever transport technology makes sense in specific areas of their network infrastructure, and still maintain an end-to-end service plane using NSH. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-nsh-sr/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-nsh-sr-03 https://datatracker.ietf.org/doc/html/draft-ietf-spring-nsh-sr-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-nsh-sr-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Fri, 25 Sep 2020 10:29:17 +0000 From: James Guichard To: "spring@ietf.org" Thread-Topic: I-D Action: draft-ietf-spring-nsh-sr-03.txt Thread-Index: AQHWkyVzIq6nRyGoJkubt6pHbQuqYKl5I+Jg Date: Fri, 25 Sep 2020 10:29:17 +0000 Message-ID: References: <160102917316.31205.3642675360462511634@ietfa.amsl.com> In-Reply-To: <160102917316.31205.3642675360462511634@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [47.14.47.233] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 03790824-0f3d-4338-f20c-08d8613ddb97 x-ms-traffictypediagnostic: DM6PR13MB3514: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: MtcOd8Tg0HaAfZnZHHqaewQmiFmzDdF2GiFg1Dhsw8jQuvRRYp7rN3JxXyX1HFE26PowS5dKCVdpnwHvHWPBqNhD/crcDi3vHOLL+pInroqklDX9pZE8vE0uY1lLOBU7T2kj0rZXjKwFTRQK78KvsglJDo4LX65uMHHajROILb/t65HmD3/e/YTN2sYAnpS1sKmNJSyffE1pCHH1tWeLvIB8DSaJvKFlaA1HYCYz0qmjffL0o1dPi84N0BrVChR1gw/fYUWQc6HKtmTWnTpbw9ludWUadVe71MtHBgOqeUy+nJWj/C5Zk5OBekjA/9hmqBdXAgqhzqkqhif5w/zxWxTcNdsWPeoBpd0JwGLbvDoqb0gQa5in68AvQ1SqAXIOSw+4w/UB0S8kxpjWuaqbACRwazL4lGF93sS7uihWZeCLeB6Q/YO2LMgPsz0e13qP x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR13MB3066.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 03790824-0f3d-4338-f20c-08d8613ddb97 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Sep 2020 10:29:17.6173 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /iu3EufkUMy9jhgQmKVSrIyXp66Ik3MW5mgOSa/ry7sW42zyxuPxSM/mCzMP8sVnUISsB2mlYFADFzTA/lVcbQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR13MB3514 Archived-At: Subject: [spring] FW: I-D Action: draft-ietf-spring-nsh-sr-03.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 10:29:26 -0000 Dear WG: [individual contributor hat on] A new version of this draft has just been posted which includes mostly edit= orial fixes and no major technical content changes. The authors believe tha= t the document is close to completion and would therefore greatly appreciat= e final WG review and comments. Please post comments to the mailing list. Thanks! Jim & co-authors -----Original Message----- From: I-D-Announce On Behalf Of internet-dr= afts@ietf.org Sent: Friday, September 25, 2020 6:20 AM To: i-d-announce@ietf.org Cc: spring@ietf.org Subject: I-D Action: draft-ietf-spring-nsh-sr-03.txt A New Internet-Draft is available from the on-line Internet-Drafts director= ies. This draft is a work item of the Source Packet Routing in Networking WG of = the IETF. Title : Integration of Network Service Header (NSH) and S= egment Routing for Service Function Chaining (SFC) Authors : James N Guichard Jeff Tantsura Filename : draft-ietf-spring-nsh-sr-03.txt Pages : 17 Date : 2020-09-25 Abstract: This document describes two application scenarios where Network Service Header (NSH) and Segment Routing (SR) can be deployed together to support Service Function Chaining (SFC) in an efficient manner while maintaining separation of the service and transport planes as originally intended by the SFC architecture. In both scenarios, SR is responsible for steering packets between SFFs along a given Service Function Path (SFP) while NSH is responsible for maintaining the integrity of the service plane, the SFC instance context, and any associated metadata. These application scenarios demonstrate that NSH and SR can work jointly and complement each other leaving the network operator with the flexibility to use whichever transport technology makes sense in specific areas of their network infrastructure, and still maintain an end-to-end service plane using NSH. The IETF datatracker status page for this draft is: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fdraft-ietf-spring-nsh-sr%2F&data=3D02%7C01%7Cjame= s.n.guichard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a= 3b240189c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3DwoxM%2FUVc= ZxLthpsob9zUtMyrmYaVQveQoBQ6YIJbSrc%3D&reserved=3D0 There are also htmlized versions available at: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.i= etf.org%2Fhtml%2Fdraft-ietf-spring-nsh-sr-03&data=3D02%7C01%7Cjames.n.g= uichard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a3b240= 189c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3DXSRxqa4MkWEEUIx= DQp0Vn%2FXZ0kB7kHiabrJ70hIP5iU%3D&reserved=3D0 https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-spring-nsh-sr-03&data=3D02%7C01= %7Cjames.n.guichard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0f= ee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3DzT%= 2BRhoxUn1OhHs09oczbYvRygFoRz0ZLAN310WO4UWc%3D&reserved=3D0 A diff from the previous version is available at: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Frfcdiff%3Furl2%3Ddraft-ietf-spring-nsh-sr-03&data=3D02%7C01%7Cj= ames.n.guichard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8f= f2a3b240189c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3DjSbqr9c= oNIuOGOlXClfDAa6nFPdNvZ3c1XunTyGvHN8%3D&reserved=3D0 Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: https://nam11.safelinks.protection.outlook.com/?url=3Dftp%3A%2F%2Fftp.ietf.= org%2Finternet-drafts%2F&data=3D02%7C01%7Cjames.n.guichard%40futurewei.= com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a3b240189c753a1d5591fedc%7= C1%7C0%7C637366260111425443&sdata=3Dd7TGiAjpBuUv7E4LcoEKOBgUYR02rpc%2BO= i7u8I07Syw%3D&reserved=3D0 _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Fi-d-announce&data=3D02%7C01%7Cjames.n.guic= hard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a3b240189= c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3D5ALvUXgDvxnH8uiqdw= XdLWjuIf%2BGlKCJ1uwqwfKEeXw%3D&reserved=3D0 Internet-Draft directories: https://nam11.safelinks.protection.outlook.com/= ?url=3Dhttp%3A%2F%2Fwww.ietf.org%2Fshadow.html&data=3D02%7C01%7Cjames.n= .guichard%40futurewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a3b2= 40189c753a1d5591fedc%7C1%7C0%7C637366260111425443&sdata=3DGHXeFOZuc5TEX= Nrp%2FIm2TwkGhj%2BHLxSreg2WvZ1RQeE%3D&reserved=3D0 or https://nam11.safelinks.protection.outlook.com/?url=3Dftp%3A%2F%2Fftp.ie= tf.org%2Fietf%2F1shadow-sites.txt&data=3D02%7C01%7Cjames.n.guichard%40f= uturewei.com%7C5a1fa18db2f34437560908d8613c9494%7C0fee8ff2a3b240189c753a1d5= 591fedc%7C1%7C0%7C637366260111425443&sdata=3Db2E7kw3vV7gG4%2BEJoMCEmQSu= xUCnTt26vOyh1Et01PU%3D&reserved=3D0 From nobody Fri Sep 25 11:26:32 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1C9EF3A11CD; Fri, 25 Sep 2020 11:26:27 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160105838708.28415.10466067245736255523@ietfa.amsl.com> Date: Fri, 25 Sep 2020 11:26:27 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-21.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 18:26:27 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-21.txt Pages : 42 Date : 2020-09-25 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-21 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-21 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-21 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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(amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7-cTcS-NhqVZ; Fri, 25 Sep 2020 11:51:56 -0700 (PDT) Received: from mail-ua1-x933.google.com (mail-ua1-x933.google.com [IPv6:2607:f8b0:4864:20::933]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 460753A0114; Fri, 25 Sep 2020 11:51:56 -0700 (PDT) Received: by mail-ua1-x933.google.com with SMTP id j12so1257980ual.7; Fri, 25 Sep 2020 11:51:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=m6SDKHDypYMZ41uaF+K6cr0faEGm1gIMc3mBj+u+PDo=; b=iBaqxOTJ9MVEqwAp12WXnjJ2V+7EvWfAy+YxIE5TzpCYTWTlIT/OGsju8TOAtDm/Kj TTn39n7DSZK0ZYJ9TVyErNZoRmPi4SGw9toBQCrxLU4IPnbkhm+syfvrpOK/jqNqNJQD 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ABdhPJwoc8A8ckMhGUWZ57U4cfcBM9AcxtAb5/N0CxeQ0J7cQP4IXQ1Ie1ZUAPg/fY0K5i5kLERxxOQ2Hc7HT6mzxJc= X-Received: by 2002:ab0:6943:: with SMTP id c3mr74571uas.111.1601059914959; Fri, 25 Sep 2020 11:51:54 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Gyan Mishra Date: Fri, 25 Sep 2020 14:51:44 -0400 Message-ID: To: James Guichard Cc: "spring-chairs@ietf.org" , "spring@ietf.org" Content-Type: multipart/alternative; boundary="0000000000007ed02e05b027cf4d" Archived-At: Subject: Re: [spring] Small SID/Compressed SID Design Team X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 18:51:58 -0000 --0000000000007ed02e05b027cf4d Content-Type: text/plain; charset="UTF-8" Hi Jim, Bruno & Joel I was wondering if it would be possible to provide a brief synopsis or debriefing of where we stand thus far with deliberations on Small SID / Compression SID design team results. Also an ETA for the WG as to when this project will be wrapped up and the compression technique to be used with SRV6 finalized. My suggestion is that with the finalized compression technique feature, in order to provide complete parity as well as transparency with SRv6, but also more importantly make it holistic as well as seamless the change to operators, it would be good if this is made part of the base SRv6 architecture and not a separate add on patch or workaround separate feature if possible. This would make it as if SRv6 architecture had the compression technique all along built into the architecture. This would overall be very positive for SRv6. I think to accomplish this would require updating the main SR architecture RFC 8402 and RFC 8754 and PGM draft referencing the new compression technique as part of the inherent architecture framework. Kind Regards Gyan On Tue, Jun 30, 2020 at 12:30 PM James Guichard < james.n.guichard@futurewei.com> wrote: > > > > > > > > > > > > > > > > > Dear SPRING WG: > > > > > > The WG chairs have been working with the relevant ADs to determine what > needs to be done to move the SPRING segment routing work related to IPv6 > along effectively. We are going to establish a design team as soon as > possible, with a specific > > objective to look at the compression-related work. > > > > > > The design team charge is still being worked on, but roughly it will be > tasked to agree on a requirements proposal to the WG and a comparison > document to be evaluated by the WG. To be clear, as is the normal case for > the IETF, the design > > team outputs are input to the WG. Their output will not become a WG > document until the WG agrees to adopt it. Also, these documents are for WG > use. It will be for future analysis as to whether it is useful to the > larger community to publish them as RFCs. > > > > > > While we have various thoughts as to membership in the design team, we > would like proposals for people we should include. We expect that there are > more people that we "should" include than can make up an effective design > time for the rapid > > delivery that we need. If you are willing to serve on the design team, > please let the chairs know. If there is someone you think would be good on > the design team, please ask them to let us know. We are NOT soliciting > evaluations of proposed people on the > > list. So, it is best if volunteers come to us directly. To be explicit, > the chairs will select the members of and the chair for this design team. > > > > > > We hope to appoint a small, effective, team that represents the varied > interests and concerns that have been expressed on the list. Folks > volunteering should understand that we hope you can move quickly, so it > will take a significant amount > > of your time. The deadline for volunteering is 6pm US PST this coming > Friday. > > > > > > Thanks! > > > > > > Jim, Joel & Bruno > > > > > > > > > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000007ed02e05b027cf4d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

    Hi Jim, Bruno & Joel

    I was wondering if it would be possible t= o provide a brief synopsis or debriefing of where we stand thus far with de= liberations on Small SID / Compression SID design team results.

    Also an ETA for the WG as to when t= his project will be wrapped up and the compression technique to be used wit= h SRV6 finalized.

    My sug= gestion is that with the finalized compression technique feature, =C2=A0in = order to provide complete parity as well as transparency with SRv6, =C2=A0b= ut also more importantly make it holistic as well as seamless the change to= operators, it would be good if this is made part of the base SRv6 architec= ture and not a separate add on patch or workaround separate feature if poss= ible.=C2=A0 This would make it as if SRv6 architecture had the compression = technique all along built into the architecture.=C2=A0 This would overall b= e very positive for SRv6.=C2=A0 I think to accomplish this would require up= dating the main SR architecture RFC 8402 and RFC 8754 and PGM draft referen= cing the new compression technique as part of the inherent architecture fra= mework.

    Kind Regards=C2= =A0

    Gyan


    On Tue, Jun 30, 2020 at 12:30 = PM James Guichard <jam= es.n.guichard@futurewei.com> wrote:















    Dear SPRI= NG WG:



    =C2=A0=



    The WG chairs have been working with the= relevant ADs to determine what needs to be done to move the SPRING segment= routing work related to IPv6 along effectively. We are going to establish = a design team as soon as possible, with a specific

    objective to loo= k at the compression-related work.



    =C2=A0



    The design t= eam charge is still being worked on, but roughly it will be tasked to agree= on a requirements proposal to the WG and a comparison document to be evalu= ated by the WG.=C2=A0 To be clear, as is the normal case for the IETF, the = design

    team outputs are input to the WG.=C2=A0 Their output will no= t become a WG document until the WG agrees to adopt it.=C2=A0 Also, these d= ocuments are for WG use.=C2=A0 It will be for future analysis as to whether= it is useful to the larger community to publish them as RFCs.



    =C2=A0



    While we have various thoughts as to membership in the desi= gn team, we would like proposals for people we should include. We expect th= at there are more people that we "should" include than can make u= p an effective design time for the rapid

    delivery that we need.=C2= =A0 If you are willing to serve on the design team, please let the chairs k= now. If there is someone you think would be good on the design team, please= ask them to let us know.=C2=A0 We are NOT soliciting evaluations of propos= ed people on the

    list.=C2=A0 So, it is best if volunteers come to u= s directly. To be explicit, the chairs will select the members of and the c= hair for this design team.



    = =C2=A0



    We hope to appoint a= small, effective, team that represents the varied interests and concerns t= hat have been expressed on the list.=C2=A0 Folks volunteering should unders= tand that we hope you can move quickly, so it will take a significant amoun= t

    of your time. The deadline for volunteering is 6pm US PST this co= ming Friday.



    =C2=A0<= u>



    Thanks!



    <= p class=3D"MsoNormal">=C2=A0



    Jim, Joel & Bruno



    = =C2=A0



    =C2=A0

    =C2=A0




    <= br>




    _______________________________________________
    spring mailing list

    spring@ietf.org

    https://www.ietf.= org/mailman/listinfo/spring

    --
    <= div dir=3D"ltr">


    Gyan Mishra

    Network Solutions Architect=C2=A0

    M 301 502-1347
    13101 Columbia Pike=C2=A0
    Silver S= pring, MD


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00:31:26 -0700 (PDT) Received: from lhreml712-chm.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id AAC5916BA0984EBABB0C; Mon, 28 Sep 2020 08:31:24 +0100 (IST) Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by lhreml712-chm.china.huawei.com (10.201.108.63) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 28 Sep 2020 08:31:23 +0100 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml705-chm.china.huawei.com (10.98.57.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 28 Sep 2020 15:31:20 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1913.007; Mon, 28 Sep 2020 15:31:20 +0800 From: "Xiejingrong (Jingrong)" To: "Pablo Camarillo (pcamaril)" , Benjamin Kaduk , The IESG CC: Bruno Decraene , "spring@ietf.org" , Joel Halpern , "spring-chairs@ietf.org" , "draft-ietf-spring-srv6-network-programming@ietf.org" Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) Thread-Index: AQHWk2o/ZiqtllsCYkCPkau6scKcnql9onQQ Date: Mon, 28 Sep 2020 07:31:20 +0000 Message-ID: <2ec228d15e974549a19f13a94787b2e4@huawei.com> References: <160093393224.24080.1727360124332839831@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.201.174] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: 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X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ZwJNlR5ezQpxtHvqi3MCTJVQgi7lAv/uWthC1RZG9s30atLyG6sK2n+lv3VhDd4/RXjmQ8FtP3xQ5T3wJThHx0kUknhzIh/Zsd70HucbzzM= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR07MB6922 Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 08:03:39 -0000 Hello Pablo, thank you. In relation to item 5, here is a suggestion discussed by the IESG during the Telechat: "In the context of this specification, the End, End.X and End.T behaviors with PSP do not contravene Section 4 of [RFC8200] because the destination address of the incoming packet is the address of the node executing the behavior." -m Le 2020-09-25 à 20:28, Pablo Camarillo (pcamaril) a écrit : > Hi Alvaro, > > Thanks for your review. See inline with [PC]. > (Note that we've just posted rev21 of the draft.) > > Thanks, > Pablo. > > -----Original Message----- > From: Alvaro Retana via Datatracker > Sent: miércoles, 23 de septiembre de 2020 22:58 > To: The IESG > Cc: draft-ietf-spring-srv6-network-programming@ietf.org; spring-chairs@ietf.org; spring@ietf.org; Bruno Decraene ; Joel Halpern > Subject: Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) > > Alvaro Retana has entered the following ballot position for > draft-ietf-spring-srv6-network-programming-20: Discuss > > When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > I am balloting DISCUSS because I find the document unclear and lacking proper technical details around significant functionality, as reflected in my first 3 points. The fourth point is related to the registration policy (which doesn't match the definition in rfc8126), and my last point is for the IESG to consider. > > (1) Pseudocode and normative behavior > > The use of pseudocode was chosen as the mechanism to specify behavior, as explained in §4: > > An implementation of the pseudocode is compliant as long as the externally > observable wire protocol is as described by the pseudocode. > > Clarity in the pseudocode is essential because it is used to determine compliance. Several places need improvement: > > (1a) In §4.1/§4.13/§4.15, the pseudocode is missing an ELSE after S04, to include the error conditions if SL != 0. A check for an error condition when SL is decremented is also needed. As written, the pseudocode could process the packet (SL == 0) *and* send an ICMP time exceeded message... :-( > [PC] Please check the pseudocode in rev 21. We have included the missing break statement in S03. I believe the current pseudocode is good. > > I'm using as a reference the pseudocode in §4.3.1.1/rfc8754, which includes the same initial statement. > > (1b) It would be nice if the behavior in §4.1.1 were also specified using pseudocode. As written, I am not sure if the intent is to process any upper-layer header or only specific ones. Is the objective for this operation to be similar to the one in §4.3.1.2/rfc8754? Please be specific on what is meant by "allowed by local configuration". > [PC] Yes, we can structure the text in 4.1.1 in pseudocode form. The processing is not the same as RFC8754/Section 4.3.1.2. The “allowed by local configuration” is to enable the processing of only specific types of Upper-layer Headers for packets addressed to an SRv6 SID of the specific behaviors. E.g. An operator may not wish to have BGP sessions (or in general any TCP traffic) destined to a local SID, but may want to enable ICMPv6 packet processing for OAM purposes. > > 4.1.1. Upper-Layer Header > > When processing the Upper-layer Header of a packet matching a FIB > entry locally instantiated as an SRv6 End SID, if Upper-layer Header > processing is allowed by local configuration (e.g. ICMPv6), then > process the upper-layer header. Otherwise, send an ICMP parameter > problem message to the Source Address and discard the packet. Error > code 4 (SR Upper-layer Header Error) and Pointer set to the offset of > the upper-layer header. > > > 4.1.1. Upper-Layer Header > > When processing the Upper-layer Header of a packet matching a FIB entry locally instantiated as an SRv6 End SID do the following: > > S01. If (Upper-Layer Header type is allowed by local configuration) { > S02. Process the Upper-layer Header > S03. } Else { > S04. Send an ICMP Parameter Problem to the Source Address, > Code 4 (SR Upper-layer Header Error), > Pointer set to the offset of the Upper-layer Header, > Interrupt packet processing and discard the packet. > S05 } > > Notes. > S01. An operator may not wish to have any TCP traffic destined to a local SID, but may want to enable ICMPv6 packet processing for OAM purposes. > > > [Note: this point by itself is not DISCUSS-worthy, but §4.1.1 is used, for different reasons, in some of the other items I point to below. That is why I include it here.] > > (1c) §4.4/§4.6: S01 of the second piece of pseudocode is an instruction for processing a non-IPv6 upper header. However, earlier in that section, it is specified that the SID "is associated with one or more L3 IPv6 adjacencies/an > IPv6 FIB table". How can the upper header not be IPv6 if the specification explicitly says it has to be? > [PC] The pseudocode is convoluted. I propose to turn it around for 4.4, 4.5, 4.6 and 4.7. As an example with 4.4: > > When processing the Upper-layer header of a packet matching a FIB > entry locally instantiated as an SRv6 End.DX6 SID, the following is > done: > > S01. If (Upper-Layer Header type != 41(IPv6) ) { > S02. Process as per Section 4.1.1 > S03. } > S04. Remove the outer IPv6 Header with all its extension headers > S05. Forward the exposed IPv6 packet to the L3 adjacency J > > > When processing the Upper-layer header of a packet matching a FIB > entry locally instantiated as an SRv6 End.DX6 SID, the following is > done: > > S01. If (Upper-Layer Header type == 41(IPv6) ) { > S02. Remove the outer IPv6 Header with all its extension headers > S03. Forward the exposed IPv6 packet to the L3 adjacency J > S04. } > S05. Else { > S06. Process as per Section 4.1.1 > S07. } > > > (1d) §4.5/§4.7 have the same issue but related to IPv4. > [PC] We’ve clarified the pseudocode on the same lines as 1c. > > (1e) §4.9 also has the same issue when it specifies that "End.DX2 SID...is associated with one outgoing interface I", but allows for the processing of non-ethernet payloads which could then be forwarded through a different outgoing interface. > [PC] We’ve clarified the pseudocode on the same lines as 1c. > > (1f) §4.11/§4.12 allows the processing of non-ethernet payloads, which will not be "associated with an L2 Table T" as described. > [PC] We’ve clarified the pseudocode on the same lines as 1c. > > (2) §4.12 describes the only behavior that can carry an ARG. I don't understand how it works: > > Arg.FE2 is encoded in the SID as an (k*x)-bit value. These bits > represent a list of up to k OIFs, each identified with an x-bit > value. Values k and x are defined on a per End.DT2M SID basis. The > interface identifier 0 indicates an empty entry in the interface > list. > > Let's assume a router has 10 possible OIFs, and the operator uses 4-bit values to identify them; then, the ARG would take 40 bits of the SID. Is that how the math works? > > Assuming my interpretation is correct, for 20 OIFs and 5-bit values we would need 100 bits. Considering the examples in §3.2, where a /64 is allocated to a router, this behavior wouldn't have enough bits! I realize that maybe a better encoding would be to use a 20-bit field, each representing an interface. > However, there would still be a limit of < 64 OIFs. Am I missing something? > [PC] For the End.DT2M behavior, Arg.FE2 is a locally allocated Ethernet Segment Identifier that is used for split-horizon filtering as described in RFC7432. The text that you have quoted above needs to be removed since it is trying to describe one way of allocation (which obviously has its limitations). Instead, we will update this text to clarify the semantics and purpose of the Arg.FE2 and its allocation method would be left as implementation specific (just similar to an ESI label). > [PC]Please see the updated text of rev21. > > I'm trying to ultimately get to the fact that there are limits to this behavior, but they are not described in the document. Please clearly explain any limitations and any possible workaround. > > (3) The description of the flavors in §4.16 is also unclear. > > The section starts with this introduction: > > The PSP, USP and USD flavors are variants of the End, End.X and End.T > behaviors. For each of these behaviors these flavors MAY be > supported for a SID either individually or in combinations. > > By being "variants", I interpret that the behavior is different than what is specified in §4.1. > > (3a) Some of the behaviors, as listed in Table 4, include an indication of the flavors. How are the values interpreted? For example, the Table lists 8 different behaviors related to End: > > | 1 | 0x0001 | End (no PSP, no USP) | [This.ID] | > | 2 | 0x0002 | End with PSP | [This.ID] | > | 3 | 0x0003 | End with USP | [This.ID] | > | 4 | 0x0004 | End with PSP&USP | [This.ID] | > ... > | 28 | 0x001C | End with USD | [This.ID] | > | 29 | 0x001D | End with PSP&USD | [This.ID] | > | 30 | 0x001E | End with USP&USD | [This.ID] | > | 31 | 0x001F | End with PSP, USP & USD | [This.ID] | > > Is value 1 what is specified in §4.1? Or does it include USD, which is not explicitly excluded)? > [PC] This has been corrected in revision 20. Can you please recheck and let me know? E.g. 0x0001 does not include any of the flavors. > > > [PC] For the remainder of the comments in this section, lets recall that a single Segment Endpoint Behavior codepoint is bound to a SID at a segment endpoint node. A node computing a segment list with a particular SID knows its associated behavior. A segment endpoint node receiving a packet destined to a locally instantiated SID performs only the processing associated with the behavior bound to that SID. A behavior is only bound to a SID, never to a node. > (3b) If a behavior with more than one flavor is signaled, how should the receiving node determine which one to apply? I guess that the application of behaviors 4 or 29 depends on the number of SLs -- the expected behavior should be clearly specified. > [PC] The segment endpoint node receiving a packet destined to a SID with behavior 4 applies only the processing associated with the SID (I.e. behavior 4). > > (3c) Is it assumed that all nodes support all behaviors? Are there mandatory to implement behaviors? Should the behavior be advertised before it is used? > [PC] The answer to first two questions is no. For the third, if a node computing a segment list does not know of a SID (and its behavior) it will not be able to 'use' the SID in a segment list. > > (3d) §4.16.1.2: > > When a SID of PSP-flavor is processed at a non-penultimate SR Segment > Endpoint Node, the PSP behavior is not performed as described in the > pseudocode below since Segments Left would not be zero. > > For example, for the End behavior, I'm assuming that behavior 1 is performed instead of 2 (or 4, or 29, or 31) if SL != 0. Should this be done even if the node did not advertise the non-PSP flavor? > [PC] If a SID of END behavior (1) is instantiated at a segment endpoint node, a packet destined to that SID will only ever be processed with behavior 1. > > If the node is not known to support the PSP flavor, should it be an error to receive a packet requesting that behavior? > [PC] If a node does not support PSP, then it has not instantiated any SID with a segment endpoint behavior including PSP, and it is not possible for it to receive a packet destined to a local SID it has not instantiated. > > If only the PSP flavor is advertised, can the Source assume that the node also supports the non-PSP flavor? > [PC] If a SID with PSP flavor is advertised (I.e. segment endpoint behavior codepoint 2) by a segment endpoint node, a SR source node can only expect that SID has the behavior bound to it. > > [BTW, I'm asking about advertisement because §4.16.1.1 makes the statement > that the nodes "advertise the SIDs instantiated on them via control plane > protocols as described in Section 9". Even though §9 talks about control > plane protocols are "not necessary for an SDN control plane" because "one > expects the controller to explicitly provision the SIDs".] > > (3e) §4.16.2 describes the USP flavor, which is one where the endpoint consumes the packet by processing the next header. I don't understand how the outcome due to the extended process is different from the original one in §4.1. Can you please explain? It seems to me that the externally observable result is the same. > [PC] We have use-cases where the packets with SRH may be destined to applications or host implementations running in containers. The USP flavor is useful to remove the consumed SRH from the extension header chain before sending over to the application stack – we’ve seen this with smartNICs. As such the perspective on externally observability differs and hence we believe it is needed to specify this. > > I have the same question about the USD flavor and the externally observable behavior related to §4.1. > [PC] The USD flavor specifically enables the de-encapsulation of inner IP packet and its further forwarding (consider use-case like TI-LFA where encapsulation is done on the PLR and de-encapsulation has to be done on the last node of the repair list). In this case the PLR node that is crafting the SID list wants to ensure that the last segment in the repair list is able to perform decapsulation. > > In general, the observable behavior of §4.1, USP, and USD seem the same to me. > The next two points are related. > > (3f) §4.16.3 describes the USD flavor, which assumes that the decapsulation results in a packet that can be forwarded. Can the FIB lookup result in a local destination? > [PC] Please refer the previous comment about the use-case and so yes, we normally expect the decapsulation results in a packet that is forwarded out. However, the inner packet may also be destined to a local address. > > (3g) Does the USD flavor mean that, for the End behavior (as described in §4.1), the action of "process the next header in the packet" cannot result in a forwarded packet? Same question for the USP behavior? > [PC] Please refer to the previous comments. There is no such assumptions on neither the base End behavior nor End with USP. > > (3h) The last paragraph in §4.16.3: > > An implementation that supports the USD flavor in conjunction with > the USP flavor MAY optimize the packet processing by first looking > whether the conditions for the USD flavor are met, in which case it > can proceed with USD processing else do USP processing. > > What are the "conditions for the USD flavor"? As far as I can tell from the document, the only condition is for the specific behavior to be signaled. What else? > [PC] I've removed this paragraph. This is an implementation optimization and provides no value to the pseudocode preceding it. > > Going back to the questions above... When is the option to optimize possible? > Does a specific behavior have to be used? Behavior 30 (End with USP&USD)? Or can it also optimize if behavior 3 (End with USP) is signaled? > > (4) §10.2 creates a new registry with an "FCFS" registration procedure. I am assuming that this is the same as the "First Come First Served" (no > abbreviation!) policy from rfc8126; please add a reference if that is the case. > [PC] Ack to change FCFS for “First Come First Served [RFC8126]”. > > The description used is not the same as what rfc8126 specifies: > > - "Requests for allocation...must include a...preferably also a brief > description of how the value will be used." Using "preferably" indicates > that a description is optional. However, it is not optional in rfc8126. > > - "...brief description...may be provided with a reference to an Internet > Draft or an RFC or in some other documentation that is permanently and > readily available." There is no such requirement in rfc8126. For example, > the "Specification Required" policy requires "a permanent and readily > available public specification". Is that what you want instead? > > [PC] Indeed, the current text is wrong. My bad. I've updated the text with this diff below. Also, I’m not sure whether that paragraph is really needed. Maybe just putting in the table “First Come First Served [RFC8126]” is sufficient as RFC8126 already describes what is written in the text below. If it can be removed please let me know. > > Requests for allocation from within the FCFS range must include a > point of contact and preferably also a brief description of how the > value will be used. This information may be provided with a > reference to an Internet Draft or an RFC or in some other > documentation that is permanently and readily available. > > > Requests for allocation from within the First Come First Serve range must include a > point of contact and a brief description of how the > value will be used. > > > (5) This point is for the IESG to discuss. > > §4.16.1.2: > > The End, End.X and End.T behaviors with PSP do not contravene > Section 4 of [RFC8200] because the destination address of the > incoming packet is the address of the node executing the behavior. > > The spring WG's interpretation of rfc8200 was a central point in the appeal presented against the WG consensus on this document. The text above, I believe, reflects that consensus. > > However, given that the document relies on the spring WG's interpretation of rfc8200, I think it would be better if the text is explicit. > > Suggestion: to add at the end of the paragraph> > > This conclusion represents the consensus interpretation of the spring WG. > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > (1) §3.1: > > An SRv6 endpoint behavior MAY require additional information for its > processing (e.g. related to the flow or service). This information > may be encoded in the ARG bits of the SID. > > The sentence is simply stating a fact, not a normative behavior. s/MAY/may > [PC] This is fixed in rev20. > > (2) All the examples in §3.2 have a /48 prefix allocated to the SRv6 deployment (and then /64s per node). Is it possible to start with a different SRv6 infrastructure allocation, a /64, or /96 maybe? If so, please include an example. If not, please explain any limitations. > [PC] The examples are based on real deployments and as such reflect the practical aspects of those operators SRv6 infrastructure allocation designs. It would be counter-productive and misleading to provide artificially manufactured examples (and then why just /96 and not something else?). The document does not pose any limitations. > > (3) §4 starts by saying that "Each FIB entry indicates the behavior associated with a SID instance and its parameters." But the previous section (§3.3. SID > Reachability) says that "node N would advertise IPv6 prefix(es) matching the LOC parts covering its SIDs or shorter-mask prefix" (not the behavior). IOW, > §3.3 sets the expectation of an advertisement covering just the LOC, but §4 seems to expect entries that cover the LOC+FUNC. Which one is correct? > [PC] Section 3.3 talks about the Prefix Reachability advertisement for the SRv6 Locator. Section 4, is talking about FIB entries instantiated on the SR Segment Endpoint Node that has allocated those local SIDs – please note that they are local entries. There is no discussion on their advertisement in Section 4. Can you please check if the update text in Section 4 in v21 clarifies? > > In the end, it may not matter which entry is in the FIB, as long as the SID is reachable. However, the specification of the behavior feels sloppy. > > (4) §4.9/§4.10: For the S04 step, perhaps decompose it into individual actions (similar to S04-S06 in §4.7). > [PC] Fixed in rev21. > > (5) §4.11/§4.12 "S05. Learn the exposed MAC Source Address..." > > The note related to this step says that in "EVPN, the learning...is done via the control plane"...but here it is done via the data plane. What, if any, is the effect on EVPN operation? Are there issues with learning conflicting information from different sources? It seems to me that it could be relatively easy to spoof the source and create unexpected entries in the L2 table. Please point to the EVPN documents where this type of operation is considered. > [PC] Indeed, text is inaccurate. I've updated the note to the following: > > S05. In EVPN, the learning of the exposed MAC Source Address is done > via the control plane. > > > S03. In EVPN RFC7432, the learning of the exposed MAC Source Address is done via control plane. In L2VPN VPLS RFC4761 RFC4762 reachability is obtained by standard learning bridge functions in the data plane. > > > (6) §4.10/§4.11/§4.12 don't have references to the example applications mentioned. Please add Informative references. > [PC] Ack. I’ve add the references to RFC7432, RFC4761, RFC4762, RFC8317, RFC4761. > > (7) §4.13/§4.15 instantiate a Binding SID, but only in the case where SL != 0. > What about the case where a Binding SID wouldn't require an extra encapsulation (SL == 0)? Is there a reason that it is not supported in this document? > [PC] Such a requirement has not yet arisen. If need arises in the future, a new behavior may be defined by a future document. This document provides the framework and the extensibility to do so. > > (8) §5.1: I'm assuming that the last line in this section (the one starting with S03) should be proceeded by "Note:". > [PC] Fixed. > > (9) §5.1: "The H.Encaps behavior is valid for any kind of Layer-3 traffic." > While it may be used for any kind of traffic, I'm assuming that there will be a policy that determines which traffic is encapsulated using a specific SRv6 policy, right? Please be specific about that. > [PC] This document does not describe how traffic is steered into an SR Policy, it may be steered by a route installed by BGP, a static route, some application specific selection, etc.. The steering of a packet into an SR Policy is out of scope of this document.. > > (10) §5.3: "Ethernet [IEEE.802.3_2012]" Please use the reference when Ethernet is first used in the document. [I have the same question as Rob related to the version of the 802.3 spec.] > [PC] Fixed in rev20. > > (11) §5.3: "...MUST remove the preamble or frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate > the preamble or FCS before forwarding Ethernet frame." Which one? The > preamble can be easily recreated by the receiver, while removing the FCS may be more problematic -- even if the FCS is not checked in transit, it seems that it would be important to carry it. In any case, the real question here is: why use "or"? Is it left at the discretion of the encapsulating node? Are there any considerations when selecting? > [PC] You are correct. Corrected to the following: > > The encapsulating node MUST remove the preamble or frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate the preamble or FCS before forwarding Ethernet frame. > > > The encapsulating node MUST remove the preamble (if any) and frame check sequence (FCS) from the Ethernet frame upon encapsulation and the decapsulating node MUST regenerate, as required, the preamble and FCS before forwarding Ethernet frame. > > > (12) All the headend behaviors (§5) include this text: > > The push of the SRH MAY be omitted when the SRv6 Policy only contains > one segment and there is no need to use any flag, tag or TLV. > > If the endpoint behavior indicates the PSP or USP flavors, what should the receiver do? Clearly there is no SRH to pop. Is this an error or should the receiver simply ignore the flavor? > [PC] If there is no SRH, then the SRH processing is not executed. > The PSP and USP flavors only make changes in the SRH processing pseudocode, hence it is not executed. > > (13) §6: "counter...for traffic that matched that SID and was processed correctly" Does "processed correctly" include when the result being an ICMP error message? Or should those be counted separately? > [PC] Packets that result in an ICMP error message or those that are dropped are not counted as correctly processed. I've updated the text. > > A node supporting this document SHOULD implement a pair of traffic > counter (one for packets and one for bytes) per local SID entry, for > traffic that matched that SID and was processed correctly. > > > A node supporting this document SHOULD implement a pair of traffic > counters (one for packets and one for bytes) per local SID entry, for > traffic that matched that SID and was processed successfully (i.e. packets which generate ICMP Error Messages or are dropped are not counted). > > > (14) §7: I'm guessing that "flow-based hash" and "load-balancing hash" are the same thing, is that correct? It would be nice to use consistent terminology. > [PC] Fixed. > > (15) §8: A rogue node inside the SR domain may (on purpose) signal the wrong behavior for a flow, which may result in the delivery of the traffic to the wrong destination (potentially including destinations outside the domain), among other things. Note that this action is possible even if the rogue node is authenticated and authorized to generate an SRH. I didn't find this threat mentioned in rfc8402/rfc8754. > [PC] The control plane protocol specifics are outside the scope of this document. I am not able to parse this comment and what is it that needs to be addressed in this document. > > (16) §9.4: I'm not sure what the purpose of §9 is, as a whole. But the summary in §9.4 puzzles me more; what is the intent? Does Table 1 indicate that, for example, an IGP implementation should not advertise the End.B6.Encaps behavior? > Does Table 2 indicate that only BGP-LS should signal the ability to H.Encaps.L2? I am confused about the value/intent because the text clearly says that the control plane is outside the scope of this document. > [PC] The section provides an overview of the role of control plane routing protocols in the advertisements of the SRv6 Locator and the SIDs along with their behaviors – all new aspects that have been introduced in this document. Based on the SRv6 solutions developed around the behaviors introduced in this document, it indicates what information is expected to be advertised via which protocol. It does not describe “how” since that is clearly outside the scope of this document and part of the individual routing protocol extensions. > > (17) [nits] > > s/an network operator/a network operator > s/one billionth and one millionth of the assigned address space/one billionth and one millionth of the available address space > s/packet's header Section 7/packet's header (Section 7)/g > [PC] Those three have been fixed. > > s/bundle(LAG)/bundle (LAG) > Please expand LAG. > [PC] "(LAG)" has been removed as per the comments of another AD. > > Thank you for your time Alvaro! > > > From nobody Mon Sep 28 01:05:13 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED15E3A0EE3; Mon, 28 Sep 2020 01:05:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pwp0QPuanjgo; Mon, 28 Sep 2020 01:05:06 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2113B3A0EE2; Mon, 28 Sep 2020 01:05:06 -0700 (PDT) Received: from lhreml724-chm.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 933EB93254A480F60BB0; Mon, 28 Sep 2020 09:05:04 +0100 (IST) Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 28 Sep 2020 09:05:03 +0100 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml705-chm.china.huawei.com (10.98.57.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 28 Sep 2020 16:05:01 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1913.007; Mon, 28 Sep 2020 16:05:01 +0800 From: "Xiejingrong (Jingrong)" To: "Pablo Camarillo (pcamaril)" , "Erik Kline" , The IESG CC: Bruno Decraene , "spring@ietf.org" , Joel Halpern , "spring-chairs@ietf.org" , "draft-ietf-spring-srv6-network-programming@ietf.org" Thread-Topic: Erik Kline's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) Thread-Index: AQHWk2oUWXsLjmNltUqJU2sOYMBE+Kl9rFyg Date: Mon, 28 Sep 2020 08:05:01 +0000 Message-ID: <64e297e6c87d4ffdbd051d69bea4f64e@huawei.com> References: <160092965760.9540.7968486706230780232@ietfa.amsl.com> In-Reply-To: Accept-Language: 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[127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 154CB3A0EF2; Mon, 28 Sep 2020 01:24:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.31 X-Spam-Level: X-Spam-Status: No, score=-1.31 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.213, RDNS_NONE=0.793, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mHGd55Zf8jsU; Mon, 28 Sep 2020 01:24:54 -0700 (PDT) Received: from skynet.si6networks.com (unknown [83.247.7.195]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B5E553A0E5D; Mon, 28 Sep 2020 01:24:53 -0700 (PDT) Received: from [IPv6:2800:810:464:1088:94f6:e1be:29e9:c5d6] (unknown [IPv6:2800:810:464:1088:94f6:e1be:29e9:c5d6]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by skynet.si6networks.com (Postfix) with ESMTPSA id 2A6111FD3; Mon, 28 Sep 2020 05:17:52 -0300 (-03) To: Martin Vigoureux , "Pablo Camarillo (pcamaril)" , Alvaro Retana , The IESG Cc: Bruno Decraene , "spring@ietf.org" , Joel Halpern , "spring-chairs@ietf.org" , "draft-ietf-spring-srv6-network-programming@ietf.org" References: <160089467694.11025.16329903730475278493@ietfa.amsl.com> <1db2daa5-c181-5ca1-0af2-629691780ce9@nokia.com> From: Fernando Gont Message-ID: Date: Mon, 28 Sep 2020 05:16:06 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <1db2daa5-c181-5ca1-0af2-629691780ce9@nokia.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 08:25:01 -0000 Hello, Martin, Alvaro, & other members of the IESG, This document is applying a very interesting interpretation of RFC8200, and I believe such interpretation steps out of the charter of Spring (or, for instance, the RTG Area). IPv6 has always forbidden en-route insertion and removal of IPv6 EHs. RFC2460 contains this text (very similar to what's in its predecessor RFC1883): With one exception, extension headers are not examined or processed by any node along a packet's delivery path, until the packet reaches the node (or each of the set of nodes, in the case of multicast) identified in the Destination Address field of the IPv6 header. There, normal demultiplexing on the Next Header field of the IPv6 header invokes the module to process the first extension header, or the upper-layer header if no extension header is present. The contents and semantics of each extension header determine whether or not to proceed to the next header. [....] The exception referred to in the preceding paragraph is the Hop-by- Hop Options header, which carries information that must be examined and processed by every node along a packet's delivery path, including the source and destination nodes. The text highlights that HBH options are processed by every node on the path, and that other EHs are only processed when the packet reaches the address in the "Destination Address" field. Indeed, RHs are processed when the packets get to such destination address, and other EHs and upper layer protocols are processed when the packet reaches the Destination Address. For packets that employ a RH, these later EHs and upper layer protocols will get processed by the node(s) identified in the Destination Address when Segments Left==0 -- that is, by the final destination. In the same timeframe that the rfc2460bis effort (that eventually lead to RFC8200) was being pursued, an individual internet-draft (draft-previdi-6man-segment-routing-header) was proposing to perform en-route header insertion/removal. When this later draft appeared in the radar of 6man participants, there were many objections to such proposal, as it was violating existing standards. The proponents of draft-previdi-6man-segment-routing-header argued that RFC2460 didn't explicitly forbid en-route EH-insertion/removal, and hence their proposal was not violating any specifications. Some of them claimed that the use of the term "processing" was ambiguous. While it was clear to the vast majority of the 6man wg that the IPv6 architecture and the ipv6 specification didn't allow for EH insertion/removal, participants felt that, since the rfc2460bis effort was ongoing, rfc2460bis should take the chance to be crystal clear on this point, to avoid possible future claims that such behavior was allowed. While the document was still in the 6man wg, the proponents of draft-previdi-6man-segment-routing-header resisted any clarifications in this respect (please see ), and hence 6man shippoed for publication a version of the document that didn't spell out the prohibition of en-route EH insertion/removal. During the IETF LC for the document, there was a strong push to have rfc2460bis be explicit about the prohibition of en-route insertion/removal of extension headers, and some subset of the participants crafted the text that eventually made it into RFC8200. Essentially, they spelled out all the prohibited actions, as explicitly sa possible, and added them along the existing text. The resulting text was: Extension headers (except for the Hop-by-Hop Options header) are not processed, inserted, or deleted by any node along a packet's delivery path, until the packet reaches the node (or each of the set of nodes, in the case of multicast) identified in the Destination Address field of the IPv6 header. While the intent was to be more explicit about the things that were prohibited, the addition of these extra terms alongside the existing text ended up introducing a bug in the specification since, af crafted, the text suggests that nodes that get to process EHs also get to e.g. insert and remove EHs. This is why I consider this a bug, and why I've submitted Erratum 6003 on RFC8200. RFC8200 contains, in Appendix B, a summary of the changes from RFC2460, and notes that: o Clarified that extension headers (except for the Hop-by-Hop Options header) are not processed, inserted, or deleted by any node along a packet's delivery path. This spells out the intent of the corresponding text. draft-ietf-6man-rfc2460bis-13 (the last internet-draft version of RFC8200), it spells out the intent of the specification with even more detail: 01) Added text that Extension headers must never be inserted by any node other than the source of the packet. Finally, draft-ietf-6man-rfc2460bis-08, the document that was shipped by the 6man wg to the IESG for publication, was indeed very explicit about the serious problems with en-route insertion/removal of EHs: The insertion of Extension Headers by any node other than the source of the packet causes serious problems. Two examples include breaking the integrity checks provided by the Authentication Header Integrity [RFC4302], and breaking Path MTU Discovery which can result in ICMP error messages being sent to the source of the packet that did not insert the header, rather than the node that inserted the header. This very same problems are caused when the node inserting or removing EHs is a node listed in an RH. It is also worth noting that RFC8200 elevated the status of IPv6 to "Internet Standard". Since RFC2460 by no means allows for en-route header insertion/removal/deletion, the incorporation of this "feature" in RFC8200 would have prevented the elevation of IPv6 to Internet Standard. This is yet another indication that Erratum 6003 refers to a bug in the specification, as opposed to an intended protocol behavior that would be a change from the preceding revision of the standard, RFC2460. As per the above, it would seem to me that before a Spring documents makes any arbitrary interpretation of RFC8200 that happens to represent a change to the IPv6 Architecture, 6man should clarify the topic, and if the IPv6 architecture is to be changed, the IETF as a whole should be involved (since that would probably be even out of the scope of 6man). Thanks, Fernando On 28/9/20 05:03, Martin Vigoureux wrote: > Hello Pablo, > > thank you. In relation to item 5, here is a suggestion discussed by the > IESG during the Telechat: > > "In the context of this specification, the End, End.X and End.T > behaviors with PSP do not contravene Section 4 of [RFC8200] because the > destination address of the incoming packet is the address of the node > executing the behavior." > > -m > > Le 2020-09-25 à 20:28, Pablo Camarillo (pcamaril) a écrit : >> Hi Alvaro, >> >> Thanks for your review. See inline with [PC]. >> (Note that we've just posted rev21 of the draft.) >> >> Thanks, >> Pablo. >> >> -----Original Message----- >> From: Alvaro Retana via Datatracker >> Sent: miércoles, 23 de septiembre de 2020 22:58 >> To: The IESG >> Cc: draft-ietf-spring-srv6-network-programming@ietf.org; >> spring-chairs@ietf.org; spring@ietf.org; Bruno Decraene >> ; Joel Halpern >> Subject: Alvaro Retana's Discuss on >> draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) >> >> Alvaro Retana has entered the following ballot position for >> draft-ietf-spring-srv6-network-programming-20: Discuss >> >> When responding, please keep the subject line intact and reply to all >> email addresses included in the To and CC lines. (Feel free to cut >> this introductory paragraph, however.) >> >> >> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >> for more information about IESG DISCUSS and COMMENT positions. >> >> >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ >> >> >> >> >> ---------------------------------------------------------------------- >> DISCUSS: >> ---------------------------------------------------------------------- >> >> I am balloting DISCUSS because I find the document unclear and lacking >> proper technical details around significant functionality, as >> reflected in my first 3 points.  The fourth point is related to the >> registration policy (which doesn't match the definition in rfc8126), >> and my last point is for the IESG to consider. >> >> (1) Pseudocode and normative behavior >> >> The use of pseudocode was chosen as the mechanism to specify behavior, >> as explained in §4: >> >>     An implementation of the pseudocode is compliant as long as the >> externally >>     observable wire protocol is as described by the pseudocode. >> >> Clarity in the pseudocode is essential because it is used to determine >> compliance.  Several places need improvement: >> >> (1a) In §4.1/§4.13/§4.15, the pseudocode is missing an ELSE after S04, >> to include the error conditions if SL != 0.  A check for an error >> condition when SL is decremented is also needed.  As written, the >> pseudocode could process the packet (SL == 0) *and* send an ICMP time >> exceeded message... :-( >> [PC] Please check the pseudocode in rev 21. We have included the >> missing break statement in S03. I believe the current pseudocode is good. >> >> I'm using as a reference the pseudocode in §4.3.1.1/rfc8754, which >> includes the same initial statement. >> >> (1b) It would be nice if the behavior in §4.1.1 were also specified >> using pseudocode.  As written, I am not sure if the intent is to >> process any upper-layer header or only specific ones.  Is the >> objective for this operation to be similar to the one in >> §4.3.1.2/rfc8754?  Please be specific on what is meant by "allowed by >> local configuration". >> [PC] Yes, we can structure the text in 4.1.1 in pseudocode form. The >> processing is not the same as RFC8754/Section 4.3.1.2. The “allowed by >> local configuration” is to enable the processing of only specific >> types of Upper-layer Headers for packets addressed to an SRv6 SID of >> the specific behaviors. E.g. An operator may not wish to have BGP >> sessions (or in general any TCP traffic) destined to a local SID, but >> may want to enable ICMPv6 packet processing for OAM purposes. >> >> 4.1.1.  Upper-Layer Header >> >>     When processing the Upper-layer Header of a packet matching a FIB >>     entry locally instantiated as an SRv6 End SID, if Upper-layer Header >>     processing is allowed by local configuration (e.g.  ICMPv6), then >>     process the upper-layer header.  Otherwise, send an ICMP parameter >>     problem message to the Source Address and discard the packet.  Error >>     code 4 (SR Upper-layer Header Error) and Pointer set to the offset of >>     the upper-layer header. >> >> >> 4.1.1.  Upper-Layer Header >> >> When processing the Upper-layer Header of a packet matching a FIB >> entry locally instantiated as an SRv6 End SID do the following: >> >> S01. If (Upper-Layer Header type is allowed by local configuration) { >> S02.   Process the Upper-layer Header >> S03. } Else { >> S04.   Send an ICMP Parameter Problem to the Source Address, >>            Code 4 (SR Upper-layer Header Error), >>            Pointer set to the offset of the Upper-layer Header, >>            Interrupt packet processing and discard the packet. >> S05  } >> >> Notes. >> S01. An operator may not wish to have any TCP traffic destined to a >> local SID, but may want to enable ICMPv6 packet processing for OAM >> purposes. >> >> >> [Note: this point by itself is not DISCUSS-worthy, but §4.1.1 is used, >> for different reasons, in some of the other items I point to below. >> That is why I include it here.] >> >> (1c) §4.4/§4.6: S01 of the second piece of pseudocode is an >> instruction for processing a non-IPv6 upper header.  However, earlier >> in that section, it is specified that the SID "is associated with one >> or more L3 IPv6 adjacencies/an >> IPv6 FIB table".  How can the upper header not be IPv6 if the >> specification explicitly says it has to be? >> [PC] The pseudocode is convoluted. I propose to turn it around for >> 4.4, 4.5, 4.6 and 4.7. As an example with 4.4: >> >>     When processing the Upper-layer header of a packet matching a FIB >>     entry locally instantiated as an SRv6 End.DX6 SID, the following is >>     done: >> >>     S01. If (Upper-Layer Header type != 41(IPv6) ) { >>     S02.    Process as per Section 4.1.1 >>     S03. } >>     S04. Remove the outer IPv6 Header with all its extension headers >>     S05. Forward the exposed IPv6 packet to the L3 adjacency J >> >> >>     When processing the Upper-layer header of a packet matching a FIB >>     entry locally instantiated as an SRv6 End.DX6 SID, the following is >>     done: >> >>     S01. If (Upper-Layer Header type == 41(IPv6) ) { >>     S02.    Remove the outer IPv6 Header with all its extension headers >>     S03.    Forward the exposed IPv6 packet to the L3 adjacency J >>     S04. } >>     S05. Else { >>     S06.    Process as per Section 4.1.1 >>     S07. } >> >> >> (1d) §4.5/§4.7 have the same issue but related to IPv4. >> [PC] We’ve clarified the pseudocode on the same lines as 1c. >> >> (1e) §4.9 also has the same issue when it specifies that "End.DX2 >> SID...is associated with one outgoing interface I", but allows for the >> processing of non-ethernet payloads which could then be forwarded >> through a different outgoing interface. >> [PC] We’ve clarified the pseudocode on the same lines as 1c. >> >> (1f) §4.11/§4.12 allows the processing of non-ethernet payloads, which >> will not be "associated with an L2 Table T" as described. >> [PC] We’ve clarified the pseudocode on the same lines as 1c. >> >> (2) §4.12 describes the only behavior that can carry an ARG.  I don't >> understand how it works: >> >>        Arg.FE2 is encoded in the SID as an (k*x)-bit value.  These bits >>        represent a list of up to k OIFs, each identified with an x-bit >>        value.  Values k and x are defined on a per End.DT2M SID >> basis.  The >>        interface identifier 0 indicates an empty entry in the interface >>        list. >> >> Let's assume a router has 10 possible OIFs, and the operator uses >> 4-bit values to identify them; then, the ARG would take 40 bits of the >> SID.  Is that how the math works? >> >> Assuming my interpretation is correct, for 20 OIFs and 5-bit values we >> would need 100 bits.  Considering the examples in §3.2, where a /64 is >> allocated to a router, this behavior wouldn't have enough bits!  I >> realize that maybe a better encoding would be to use a 20-bit field, >> each representing an interface. >> However, there would still be a limit of < 64 OIFs.  Am I missing >> something? >> [PC] For the End.DT2M behavior, Arg.FE2 is a locally allocated >> Ethernet Segment Identifier that is used for split-horizon filtering >> as described in RFC7432. The text that you have quoted above needs to >> be removed since it is trying to describe one way of allocation (which >> obviously has its limitations). Instead, we will update this text to >> clarify the semantics and purpose of the Arg.FE2 and its allocation >> method would be left as implementation specific (just similar to an >> ESI label). >> [PC]Please see the updated text of rev21. >> >> I'm trying to ultimately get to the fact that there are limits to this >> behavior, but they are not described in the document.  Please clearly >> explain any limitations and any possible workaround. >> >> (3) The description of the flavors in §4.16 is also unclear. >> >> The section starts with this introduction: >> >>     The PSP, USP and USD flavors are variants of the End, End.X and End.T >>     behaviors.  For each of these behaviors these flavors MAY be >>     supported for a SID either individually or in combinations. >> >> By being "variants", I interpret that the behavior is different than >> what is specified in §4.1. >> >> (3a) Some of the behaviors, as listed in Table 4, include an >> indication of the flavors.  How are the values interpreted?  For >> example, the Table lists 8 different behaviors related to End: >> >> | 1           | 0x0001 |   End (no PSP, no USP)  |    [This.ID]     | >> | 2           | 0x0002 |       End with PSP      |    [This.ID]     | >> | 3           | 0x0003 |       End with USP      |    [This.ID]     | >> | 4           | 0x0004 |     End with PSP&USP    |    [This.ID]     | >> ... >> | 28          | 0x001C |       End with USD      |    [This.ID]     | >> | 29          | 0x001D |     End with PSP&USD    |    [This.ID]     | >> | 30          | 0x001E |     End with USP&USD    |    [This.ID]     | >> | 31          | 0x001F | End with PSP, USP & USD |    [This.ID]     | >> >> Is value 1 what is specified in §4.1?  Or does it include USD, which >> is not explicitly excluded)? >> [PC] This has been corrected in revision 20. Can you please recheck >> and let me know? E.g. 0x0001 does not include any of the flavors. >> >> >> [PC] For the remainder of the comments in this section, lets recall >> that a single Segment Endpoint Behavior codepoint is bound to a SID at >> a segment endpoint node.   A node computing a segment list with a >> particular SID knows its associated behavior.  A segment endpoint node >> receiving a packet destined to a locally instantiated SID performs >> only the processing associated with the behavior bound to that SID.  A >> behavior is only bound to a SID, never to a node. >> (3b) If a behavior with more than one flavor is signaled, how should >> the receiving node determine which one to apply?  I guess that the >> application of behaviors 4 or 29 depends on the number of SLs -- the >> expected behavior should be clearly specified. >> [PC] The segment endpoint node receiving a packet destined to a SID >> with behavior 4 applies only the processing associated with the SID >> (I.e. behavior 4). >> >> (3c) Is it assumed that all nodes support all behaviors?  Are there >> mandatory to implement behaviors?  Should the behavior be advertised >> before it is used? >> [PC] The answer to first two questions is no. For the third, if a node >> computing a segment list does not know of a SID (and its behavior) it >> will not be able to 'use' the SID in a segment list. >> >> (3d) §4.16.1.2: >> >>     When a SID of PSP-flavor is processed at a non-penultimate SR Segment >>     Endpoint Node, the PSP behavior is not performed as described in the >>     pseudocode below since Segments Left would not be zero. >> >> For example, for the End behavior, I'm assuming that behavior 1 is >> performed instead of 2 (or 4, or 29, or 31) if SL != 0.  Should this >> be done even if the node did not advertise the non-PSP flavor? >> [PC] If a SID of END behavior (1) is instantiated at a segment >> endpoint node, a packet destined to that SID will only ever be >> processed with behavior 1. >> >> If the node is not known to support the PSP flavor, should it be an >> error to receive a packet requesting that behavior? >> [PC] If a node does not support PSP, then it has not instantiated any >> SID with a segment endpoint behavior including PSP, and it is not >> possible for it to receive a packet destined to a local SID it has not >> instantiated. >> >> If only the PSP flavor is advertised, can the Source assume that the >> node also supports the non-PSP flavor? >> [PC] If a SID with PSP flavor is advertised (I.e. segment endpoint >> behavior codepoint 2) by a segment endpoint node, a SR source node can >> only expect that SID has the behavior bound to it. >> >>    [BTW, I'm asking about advertisement because §4.16.1.1 makes the >> statement >>    that the nodes "advertise the SIDs instantiated on them via control >> plane >>    protocols as described in Section 9".  Even though §9 talks about >> control >>    plane protocols are "not necessary for an SDN control plane" >> because "one >>    expects the controller to explicitly provision the SIDs".] >> >> (3e) §4.16.2 describes the USP flavor, which is one where the endpoint >> consumes the packet by processing the next header.  I don't understand >> how the outcome due to the extended process is different from the >> original one in §4.1.  Can you please explain?  It seems to me that >> the externally observable result is the same. >> [PC] We have use-cases where the packets with SRH may be destined to >> applications or host implementations running in containers. The USP >> flavor is useful to remove the consumed SRH from the extension header >> chain before sending over to the application stack – we’ve seen this >> with smartNICs. As such the perspective on externally observability >> differs and hence we believe it is needed to specify this. >> >> I have the same question about the USD flavor and the externally >> observable behavior related to §4.1. >> [PC] The USD flavor specifically enables the de-encapsulation of inner >> IP packet and its further forwarding (consider use-case like TI-LFA >> where encapsulation is done on the PLR and de-encapsulation has to be >> done on the last node of the repair list). In this case the PLR node >> that is crafting the SID list wants to ensure that the last segment in >> the repair list is able to perform decapsulation. >> >> In general, the observable behavior of §4.1, USP, and USD seem the >> same to me. >> The next two points are related. >> >> (3f) §4.16.3 describes the USD flavor, which assumes that the >> decapsulation results in a packet that can be forwarded.  Can the FIB >> lookup result in a local destination? >> [PC] Please refer the previous comment about the use-case and so yes, >> we normally expect the decapsulation results in a packet that is >> forwarded out. However, the inner packet may also be destined to a >> local address. >> >> (3g) Does the USD flavor mean that, for the End behavior (as described >> in §4.1), the action of "process the next header in the packet" cannot >> result in a forwarded packet?  Same question for the USP behavior? >> [PC] Please refer to the previous comments. There is no such >> assumptions on neither the base End behavior nor End with USP. >> >> (3h) The last paragraph in §4.16.3: >> >>     An implementation that supports the USD flavor in conjunction with >>     the USP flavor MAY optimize the packet processing by first looking >>     whether the conditions for the USD flavor are met, in which case it >>     can proceed with USD processing else do USP processing. >> >> What are the "conditions for the USD flavor"?  As far as I can tell >> from the document, the only condition is for the specific behavior to >> be signaled.  What else? >> [PC] I've removed this paragraph. This is an implementation >> optimization and provides no value to the pseudocode preceding it. >> >> Going back to the questions above...  When is the option to optimize >> possible? >> Does a specific behavior have to be used?  Behavior 30 (End with >> USP&USD)?  Or can it also optimize if behavior 3 (End with USP) is >> signaled? >> >> (4) §10.2 creates a new registry with an "FCFS" registration >> procedure.  I am assuming that this is the same as the "First Come >> First Served" (no >> abbreviation!) policy from rfc8126; please add a reference if that is >> the case. >> [PC] Ack to change FCFS for “First Come First Served [RFC8126]”. >> >>   The description used is not the same as what rfc8126 specifies: >> >> - "Requests for allocation...must include a...preferably also a brief >>    description of how the value will be used."   Using "preferably" >> indicates >>    that a description is optional.  However, it is not optional in >> rfc8126. >> >> - "...brief description...may be provided with a reference to an Internet >>    Draft or an RFC or in some other documentation that is permanently and >>    readily available."  There is no such requirement in rfc8126.  For >> example, >>    the "Specification Required" policy requires "a permanent and readily >>    available public specification".  Is that what you want  instead? >> >> [PC] Indeed, the current text is wrong. My bad. I've updated the text >> with this diff below. Also, I’m not sure whether that paragraph is >> really needed. Maybe just putting in the table “First Come First >> Served [RFC8126]” is sufficient as RFC8126 already describes what is >> written in the text below. If it can be removed please let me know. >> >>     Requests for allocation from within the FCFS range must include a >>     point of contact and preferably also a brief description of how the >>     value will be used.  This information may be provided with a >>     reference to an Internet Draft or an RFC or in some other >>     documentation that is permanently and readily available. >> >> >>     Requests for allocation from within the First Come First Serve >> range must include a >>     point of contact and a brief description of how the >>     value will be used. >> >> >> (5) This point is for the IESG to discuss. >> >> §4.16.1.2: >> >>        The End, End.X and End.T behaviors with PSP do not contravene >>        Section 4 of [RFC8200] because the destination address of the >>        incoming packet is the address of the node executing the behavior. >> >> The spring WG's interpretation of rfc8200 was a central point in the >> appeal presented against the WG consensus on this document.  The text >> above, I believe, reflects that consensus. >> >> However, given that the document relies on the spring WG's >> interpretation of rfc8200, I think it would be better if the text is >> explicit. >> >> Suggestion: to add at the end of the paragraph> >> >>     This conclusion represents the consensus interpretation of the >> spring WG. >> >> >> ---------------------------------------------------------------------- >> COMMENT: >> ---------------------------------------------------------------------- >> >> (1) §3.1: >> >>     An SRv6 endpoint behavior MAY require additional information for its >>     processing (e.g. related to the flow or service).  This information >>     may be encoded in the ARG bits of the SID. >> >> The sentence is simply stating a fact, not a normative behavior. >> s/MAY/may >> [PC] This is fixed in rev20. >> >> (2) All the examples in §3.2 have a /48 prefix allocated to the SRv6 >> deployment (and then /64s per node).  Is it possible to start with a >> different SRv6 infrastructure allocation, a /64, or /96 maybe?  If so, >> please include an example.  If not, please explain any limitations. >> [PC] The examples are based on real deployments and as such reflect >> the practical aspects of those operators SRv6 infrastructure >> allocation designs. It would be counter-productive and misleading to >> provide artificially manufactured examples (and then why just /96 and >> not something else?). The document does not pose any limitations. >> >> (3) §4 starts by saying that "Each FIB entry indicates the behavior >> associated with a SID instance and its parameters."  But the previous >> section (§3.3. SID >> Reachability) says that "node N would advertise IPv6 prefix(es) >> matching the LOC parts covering its SIDs or shorter-mask prefix" (not >> the behavior).  IOW, >> §3.3 sets the expectation of an advertisement covering just the LOC, >> but §4 seems to expect entries that cover the LOC+FUNC.  Which one is >> correct? >> [PC] Section 3.3 talks about the Prefix Reachability advertisement for >> the SRv6 Locator. Section 4, is talking about FIB entries instantiated >> on the SR Segment Endpoint Node that has allocated those local SIDs – >> please note that they are local entries. There is no discussion on >> their advertisement in Section 4. Can you please check if the update >> text in Section 4 in v21 clarifies? >> >> In the end, it may not matter which entry is in the FIB, as long as >> the SID is reachable.  However, the specification of the behavior >> feels sloppy. >> >> (4) §4.9/§4.10: For the S04 step, perhaps decompose it into individual >> actions (similar to S04-S06 in §4.7). >> [PC] Fixed in rev21. >> >> (5) §4.11/§4.12  "S05. Learn the exposed MAC Source Address..." >> >> The note related to this step says that in "EVPN, the learning...is >> done via the control plane"...but here it is done via the data plane. >> What, if any, is the effect on EVPN operation?  Are there issues with >> learning conflicting information from different sources?  It seems to >> me that it could be relatively easy to spoof the source and create >> unexpected entries in the L2 table.  Please point to the EVPN >> documents where this type of operation is considered. >> [PC] Indeed, text is inaccurate. I've updated the note to the following: >> >>     S05.  In EVPN, the learning of the exposed MAC Source Address is done >>     via the control plane. >> >> >> S03. In EVPN RFC7432, the learning of the exposed MAC Source Address >> is done via control plane. In L2VPN VPLS RFC4761 RFC4762 reachability >> is obtained by standard learning bridge functions in the data plane. >> >> >> (6) §4.10/§4.11/§4.12 don't have references to the example >> applications mentioned.  Please add Informative references. >> [PC] Ack. I’ve add the references to RFC7432, RFC4761, RFC4762, >> RFC8317, RFC4761. >> >> (7) §4.13/§4.15 instantiate a Binding SID, but only in the case where >> SL != 0. >> What about the case where a Binding SID wouldn't require an extra >> encapsulation (SL == 0)?  Is there a reason that it is not supported >> in this document? >> [PC] Such a requirement has not yet arisen. If need arises in the >> future, a new behavior may be defined by a future document. This >> document provides the framework and the extensibility to do so. >> >> (8) §5.1: I'm assuming that the last line in this section (the one >> starting with S03) should be proceeded by "Note:". >> [PC] Fixed. >> >> (9) §5.1: "The H.Encaps behavior is valid for any kind of Layer-3 >> traffic." >> While it may be used for any kind of traffic, I'm assuming that there >> will be a policy that determines which traffic is encapsulated using a >> specific SRv6 policy, right?  Please be specific about that. >> [PC] This document does not describe how traffic is steered into an SR >> Policy, it may be steered by a route installed by BGP, a static route, >> some application specific selection, etc.. The steering of a packet >> into an SR Policy is out of scope of this document.. >> >> (10) §5.3: "Ethernet [IEEE.802.3_2012]"  Please use the reference when >> Ethernet is first used in the document.  [I have the same question as >> Rob related to the version of the 802.3 spec.] >> [PC] Fixed in rev20. >> >> (11) §5.3: "...MUST remove the preamble or frame check sequence (FCS) >> from the Ethernet frame upon encapsulation and the decapsulating node >> MUST regenerate >> the preamble or FCS before forwarding Ethernet frame."   Which one?  The >> preamble can be easily recreated by the receiver, while removing the >> FCS may be more problematic -- even if the FCS is not checked in >> transit, it seems that it would be important to carry it.  In any >> case, the real question here is: why use "or"?  Is it left at the >> discretion of the encapsulating node?  Are there any considerations >> when selecting? >> [PC] You are correct. Corrected to the following: >> >> The encapsulating node MUST remove the preamble or frame check >> sequence (FCS) from the Ethernet frame upon encapsulation and the >> decapsulating node MUST regenerate the preamble or FCS before >> forwarding Ethernet frame. >> >> >> The encapsulating node MUST remove the preamble (if any) and frame >> check sequence (FCS) from the Ethernet frame upon encapsulation and >> the decapsulating node MUST regenerate, as required, the preamble and >> FCS before forwarding Ethernet frame. >> >> >> (12) All the headend behaviors (§5) include this text: >> >>     The push of the SRH MAY be omitted when the SRv6 Policy only contains >>     one segment and there is no need to use any flag, tag or TLV. >> >> If the endpoint behavior indicates the PSP or USP flavors, what should >> the receiver do?  Clearly there is no SRH to pop.  Is this an error or >> should the receiver simply ignore the flavor? >> [PC] If there is no SRH, then the SRH processing is not executed. >> The PSP and USP flavors only make changes in the SRH processing >> pseudocode, hence it is not executed. >> >> (13) §6: "counter...for traffic that matched that SID and was >> processed correctly"  Does "processed correctly" include when the >> result being an ICMP error message?  Or should those be counted >> separately? >> [PC] Packets that result in an ICMP error message or those that are >> dropped are not counted as correctly processed. I've updated the text. >> >>     A node supporting this document SHOULD implement a pair of traffic >>     counter (one for packets and one for bytes) per local SID entry, for >>     traffic that matched that SID and was processed correctly. >> >> >>     A node supporting this document SHOULD implement a pair of traffic >>     counters (one for packets and one for bytes) per local SID entry, for >>     traffic that matched that SID and was processed successfully (i.e. >> packets which generate ICMP Error Messages or are dropped are not >> counted). >> >> >> (14) §7: I'm guessing that "flow-based hash" and "load-balancing hash" >> are the same thing, is that correct?  It would be nice to use >> consistent terminology. >> [PC] Fixed. >> >> (15) §8: A rogue node inside the SR domain may (on purpose) signal the >> wrong behavior for a flow, which may result in the delivery of the >> traffic to the wrong destination (potentially including destinations >> outside the domain), among other things.  Note that this action is >> possible even if the rogue node is authenticated and authorized to >> generate an SRH.  I didn't find this threat mentioned in rfc8402/rfc8754. >> [PC] The control plane protocol specifics are outside the scope of >> this document. I am not able to parse this comment and what is it that >> needs to be addressed in this document. >> >> (16) §9.4: I'm not sure what the purpose of §9 is, as a whole.  But >> the summary in §9.4 puzzles me more; what is the intent?  Does Table 1 >> indicate that, for example, an IGP implementation should not advertise >> the End.B6.Encaps behavior? >>   Does Table 2 indicate that only BGP-LS should signal the ability to >> H.Encaps.L2?  I am confused about the value/intent because the text >> clearly says that the control plane is outside the scope of this >> document. >> [PC] The section provides an overview of the role of control plane >> routing protocols in the advertisements of the SRv6 Locator and the >> SIDs along with their behaviors – all new aspects that have been >> introduced in this document. Based on the SRv6 solutions developed >> around the behaviors introduced in this document, it indicates what >> information is expected to be advertised via which protocol. It does >> not describe “how” since that is clearly outside the scope of this >> document and part of the individual routing protocol extensions. >> >> (17) [nits] >> >> s/an network operator/a network operator >> s/one billionth and one millionth of the assigned address space/one >> billionth and one millionth of the available address space >> s/packet's header Section 7/packet's header (Section 7)/g >> [PC] Those three have been fixed. >> >> s/bundle(LAG)/bundle (LAG) >> Please expand LAG. >> [PC] "(LAG)" has been removed as per the comments of another AD. >> >> Thank you for your time Alvaro! >> >> >> > > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring -- Fernando Gont e-mail: fernando@gont.com.ar || fgont@si6networks.com PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1 From nobody Mon Sep 28 01:43:12 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: 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Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 383AB3A10F0; Mon, 28 Sep 2020 05:40:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id koFl605sUZDv; Mon, 28 Sep 2020 05:40:41 -0700 (PDT) Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0875D3A10EC; Mon, 28 Sep 2020 05:40:34 -0700 (PDT) Received: by mail-lj1-x22b.google.com with SMTP id k25so887007ljg.9; Mon, 28 Sep 2020 05:40:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=n3l/LW4JPinRCKAvt1qHc26xcpaIZDlUu2GEMxJN6vo=; b=pM+SnWP0m9XdBXbOh4nn3vhfkf1AuNNrJ80V3VfNp0jwQEn9XQfppaMHi8SHnpAKp5 CK2imWVWpqL8HKr0x5vPNid3qsP0e6V6GygIN4agLN9iUiLzJa68T7ao/r/IBJ2uPsq0 5rIHJcqVWhjtyoqsLnc0hb3EWAiSUxqlzmJfCgvWPYbVzJewyyXAvkU0WaIlbn5zWn0v PdDld/D5yiKvh54WjVaw3ZzjlcwDBdIZlYYdr/BfLc6+lTzO/ZEviH5muW42wdy32gBe FhymFRRPnh95v1aPTezTmMmbkqS7+OIH9uiXn7hT7cJyRkySMFbNhnQq7S7P7Kzfykk0 JUHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=n3l/LW4JPinRCKAvt1qHc26xcpaIZDlUu2GEMxJN6vo=; b=e3CICuWp0afcynY6M5it1uvsB+ZjCObHy6O8sn6h1F9aQhzzRPs5Z9WTfAQ50FOTcY qYtn14oyKlstpppYoGGo+pr53ygpgUaezq0JEfnk8CdPuniBvI6YyltUVcL+Gg6HiKeJ LjMwf7ECV9bxZ7LgCQoLD99D3pxDitJBEFHezWM8KnuvRm1EAAj5Ed28fEIX9DwJKXp+ ky9PQRCkYZkiTShutMTY6IWxggwIhavH2Pi+hUEq3jjzgO8l3y0hpEv2ob9MZ5Cd5/4V vf0pMdf/nX2AT757Ez+p02OHMI9uurkbmLovOp2erV/xhDrsXlywmRLl7nRZnLvpJHoY AH0w== X-Gm-Message-State: AOAM531I4Y+jmeu0EVJbNbt44RKzYPzzZMezDAlTS/8w7xzHKAMOP1mX KzkR8u+jUv4otcbrYxhkR9+twr8RP0HUE/x5TkVjRbc+eePh4js= X-Google-Smtp-Source: ABdhPJwDo7dq3ckBA4tBP97k/KYuDj4cVjzLgi4LhQxqy12C/AYjYkH+PoBXll6KwZzqofjR4+naoIg/YQuOTlBjmHI= X-Received: by 2002:a2e:9218:: with SMTP id k24mr369800ljg.306.1601296831781; Mon, 28 Sep 2020 05:40:31 -0700 (PDT) MIME-Version: 1.0 From: Rakesh Gandhi Date: Mon, 28 Sep 2020 08:40:20 -0400 Message-ID: To: spring , mpls@ietf.org, IETF IPPM WG Content-Type: multipart/alternative; boundary="000000000000d6a2ee05b05ef8f9" Archived-At: Subject: [spring] Updated draft-gandhi-spring-sr-enhanced-plm-03 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 12:40:43 -0000 --000000000000d6a2ee05b05ef8f9 Content-Type: text/plain; charset="UTF-8" Hi WG, We have posted a new revision that addresses various comments received. Updates are as following: - Add TWAMP (STAMP) compatible probe message format - Use consistent terms for MPLS Timestamp Label and SRv6 Timestamp Endpoint - Add extension Label in MPLS header - Add section on SRv6 Timestamp Endpoint function assignment and Node Capability - Update IANA section - Various editorial changes (e.g. moving some text to new Overview section) URL: https://www.ietf.org/id/draft-gandhi-spring-sr-enhanced-plm-03.txt Status: https://datatracker.ietf.org/doc/draft-gandhi-spring-sr-enhanced-plm/ Htmlized: https://datatracker.ietf.org/doc/html/draft-gandhi-spring-sr-enhanced-plm Htmlized: https://tools.ietf.org/html/draft-gandhi-spring-sr-enhanced-plm-03 Diff: https://www.ietf.org/rfcdiff?url2=draft-gandhi-spring-sr-enhanced-plm-03 Thank you for the feedback. Welcome your further comments and suggestions. Thanks, Rakesh (on behalf of the authors) --000000000000d6a2ee05b05ef8f9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi WG,
    We have posted a new revision that addresses various comments receiv= ed. Updates are as following:
    • Add TWAMP (STAMP) compatible probe message format
    • Use consistent terms for MPLS Timestamp Label and SRv6 Timestamp Endpoint
      • =
    • Add extension Label in MPLS header
    • Add s= ection on SRv6 Timestamp Endpoint function assignment and Node Capability=
    • Update IANA section
    • Various editorial changes (e.g. moving some text to new Overview section)

    URL:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0https://www.ietf.org/id/draft-gandhi-spring-sr-enhanced-plm-= 03.txt

    Status:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0https://datatracker= .ietf.org/doc/draft-gandhi-spring-sr-enhanced-plm/<= /font>

    Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<= span class=3D"gmail-apple-converted-space">=C2=A0https://datatracker.ietf.or= g/doc/html/draft-gandhi-spring-sr-enhanced-plm

    Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<= span class=3D"gmail-apple-converted-space">=C2=A0https://tools.ietf.org/html/draft-= gandhi-spring-sr-enhanced-plm-03

    Diff:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0http= s://www.ietf.org/rfcdiff?url2=3Ddraft-gandhi-spring-sr-enhanced-plm-03<= span>


    Thank yo= u for the feedback. Welcome your further comments and suggestions. <= /div>

    Thanks,
    Rakesh (on behalf of the authors)

    --000000000000d6a2ee05b05ef8f9-- From nobody Mon Sep 28 09:04:43 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4975E3A0FC6; Mon, 28 Sep 2020 09:04:36 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160130907622.24885.4123125050622825554@ietfa.amsl.com> Date: Mon, 28 Sep 2020 09:04:36 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-22.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 16:04:36 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-22.txt Pages : 42 Date : 2020-09-28 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-22 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-22 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-22 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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<259b131f40b44a1ea77c1ce2aef24a3c@cert.org> References: <160071265366.14948.8163350323208659826@ietfa.amsl.com> <59b404f1dcdc485485813b2b80376976@cert.org> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.64.202.177] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Roman Danyliw's Discuss on draft-ietf-spring-srv6-network-programming-19: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 19:27:55 -0000 SGkgUGFibG8hDQoNClRoYW5rcyBmb3IgdGhlIGV4cGxhbmF0aW9uLiAgSSd2ZSBjbGVhcmVkIG15 IERJU0NVU1MuDQoNClJlZ2FyZHMsDQpSb21hbg0KDQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0t 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X-Received: by 2002:a50:f687:: with SMTP id d7mr226551edn.353.1601333405226; Mon, 28 Sep 2020 15:50:05 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Mon, 28 Sep 2020 15:50:04 -0700 From: Alvaro Retana In-Reply-To: References: <160089467694.11025.16329903730475278493@ietfa.amsl.com> MIME-Version: 1.0 Date: Mon, 28 Sep 2020 15:50:04 -0700 Message-ID: To: The IESG , "Pablo Camarillo (pcamaril)" Cc: Joel Halpern , "spring-chairs@ietf.org" , Bruno Decraene , "spring@ietf.org" , "draft-ietf-spring-srv6-network-programming@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [spring] Alvaro Retana's Discuss on draft-ietf-spring-srv6-network-programming-20: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 22:50:10 -0000 On September 25, 2020 at 2:28:53 PM, Pablo Camarillo wrote: Pablo: Hi! I still have a couple of comments related to the DISCUSS portion. =C2=A0And some non-blocking comments later on. I looked at -22. Thanks! Alvaro. > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- I think we need some more discussion on 1c, 3b, 3d. 3e-3g can be resolved with a more text on the expected types of use cases. =C2=A0See more below. ... > (1b) It would be nice if the behavior in =C2=A74.1.1 were also specified = using > pseudocode. As written, I am not sure if the intent is to process any > upper-layer header or only specific ones. Is the objective for this > operation to be similar to the one in =C2=A74.3.1.2/rfc8754? Please be sp= ecific > on what is meant by "allowed by local configuration". > [PC] Yes, we can structure the text in 4.1.1 in pseudocode form. The [PC] processing is not the same as RFC8754/Section 4.3.1.2. The =E2=80=9Cal= lowed by [PC] local configuration=E2=80=9D is to enable the processing of only speci= fic types [PC] of Upper-layer Headers for packets addressed to an SRv6 SID of the [PC] specific behaviors. E.g. An operator may not wish to have BGP sessions [PC] (or in general any TCP traffic) destined to a local SID, but may want = to [PC] enable ICMPv6 packet processing for OAM purposes. ... =C2=A74.1.1 is called from different places, while processing different behaviors. =C2=A0Is it expected that the "local configuration" will cover each behavior individually, or will the operator be able to configure a single policy for all? =C2=A0In either case, it would be good to mention it. ... > (1c) =C2=A74.4/=C2=A74.6: S01 of the second piece of pseudocode is an ins= truction for > processing a non-IPv6 upper header. However, earlier in that section, it = is > specified that the SID "is associated with one or more L3 IPv6 > adjacencies/an IPv6 FIB table". How can the upper header not be IPv6 if t= he > specification explicitly says it has to be? > [PC] The pseudocode is convoluted. I propose to turn it around for 4.4, 4.5= , [PC] 4.6 and 4.7. As an example with 4.4: ... I still have the same question. =C2=A0For example, in =C2=A74.4/End.DX6, I = don't understand under which conditions the upper-layer won't be IPv6. The behavior in =C2=A74.1.1 now starts by saying: "Upper-Layer Header type is allowed by local configuration". =C2=A0Same question: For example, for End.DX6, when would something other than IPv6 be allowed by local configuration? It seems to me that if the behavior "is associated with one or more L3 IPv6 adjacencies", then the contents should either be IPv6 or be discarded. Otherwise the sender may include something else (IPv4, for example) and it may be forwarded... I may be missing something obvious, I just don't know what. [Similar concerns for other sections where the payload is sent to =C2=A74.1.1 if the contents don't match what the behavior expects.] ... > (3) The description of the flavors in =C2=A74.16 is also unclear. ... > (3b) If a behavior with more than one flavor is signaled, how should the > receiving node determine which one to apply? I guess that the application= of > behaviors 4 or 29 depends on the number of SLs -- the expected behavior > should be clearly specified. > [PC] The segment endpoint node receiving a packet destined to a SID with [PC] behavior 4 applies only the processing associated with the SID (I.e. [PC] behavior 4). Sorry, I mixed up some of the terminology. =C2=A0Let me try this one again. For an endpoint behavior that indicates more than one flavor, which one should be applied? For some of the behaviors, 29 (End with PSP&USD) for example, the flavor used seems to depend on the number of SLs: if received with SL =3D=3D 0, then the flavor is USD, but if received with SL =3D=3D 1 then use PSP. =C2=A0But for other behaviors, 30 (End with USP&USD) for example, which flavor should be applied if both are supported? ... > (3d) =C2=A74.16.1.2: > > When a SID of PSP-flavor is processed at a non-penultimate SR Segment > Endpoint Node, the PSP behavior is not performed as described in the > pseudocode below since Segments Left would not be zero. > > For example, for the End behavior, I'm assuming that behavior 1 is perfor= med > instead of 2 (or 4, or 29, or 31) if SL !=3D 0. Should this be done even = if > the node did not advertise the non-PSP flavor? > [PC] If a SID of END behavior (1) is instantiated at a segment endpoint nod= e, [PC] a packet destined to that SID will only ever be processed with behavio= r [PC] 1. Redo: =C2=A0If the SID used indicates behavior 2 (End with PSP), but the node is the last one (not the penultimate one), then what should it do? =C2=A0This result is probably an error from the sender. =C2=A0Should th= e receiver drop the packet, or process as behavior 1? =C2=A0 Assuming that the node instantiated SIDs for both behaviors. ... > (3e) =C2=A74.16.2 describes the USP flavor, which is one where the endpoi= nt > consumes the packet by processing the next header. I don't understand how > the outcome due to the extended process is different from the original on= e > in =C2=A74.1. Can you please explain? It seems to me that the externally > observable result is the same. > [PC] We have use-cases where the packets with SRH may be destined to [PC] applications or host implementations running in containers. The USP [PC] flavor is useful to remove the consumed SRH from the extension header [PC] chain before sending over to the application stack =E2=80=93 we=E2=80= =99ve seen this [PC] with smartNICs. As such the perspective on externally observability [PC] differs and hence we believe it is needed to specify this. Ok. =C2=A0Please include the use case so that it is clear to others that the external behavior is different. > I have the same question about the USD flavor and the externally observab= le > behavior related to =C2=A74.1. > [PC] The USD flavor specifically enables the de-encapsulation of inner IP [PC] packet and its further forwarding (consider use-case like TI-LFA where [PC] encapsulation is done on the PLR and de-encapsulation has to be done o= n [PC] the last node of the repair list). In this case the PLR node that is [PC] crafting the SID list wants to ensure that the last segment in the [PC] repair list is able to perform decapsulation. Ok. =C2=A0Please include the use case... > In general, the observable behavior of =C2=A74.1, USP, and USD seem the s= ame to > me. > The next two points are related. > > (3f) =C2=A74.16.3 describes the USD flavor, which assumes that the decaps= ulation > results in a packet that can be forwarded. Can the FIB lookup result in a > local destination? > [PC] Please refer the previous comment about the use-case and so yes, we [PC] normally expect the decapsulation results in a packet that is forwarde= d [PC] out. However, the inner packet may also be destined to a local address= . Just to make sure I understand, if it is ok for the destination to be a local address then the external observable behavior is equivalent to End, right? > (3g) Does the USD flavor mean that, for the End behavior (as described in > =C2=A74.1), the action of "process the next header in the packet" cannot = result > in a forwarded packet? Same question for the USP behavior? > [PC] Please refer to the previous comments. There is no such assumptions on [PC] neither the base End behavior nor End with USP. Right...here again, the external behaviors may then be the same. I see how there may be differences, in line with the use cases, and how some of the behaviors may end up being the same...sometimes. Let's then add sample use case information and move on. ... > (4) =C2=A710.2 creates a new registry with an "FCFS" registration procedu= re. ... [PC] Indeed, the current text is wrong. My bad. I've updated the text with [PC] this diff below. Also, I=E2=80=99m not sure whether that paragraph is = really [PC] needed. Maybe just putting in the table =E2=80=9CFirst Come First Serv= ed [PC] [RFC8126]=E2=80=9D is sufficient as RFC8126 already describes what is = written in [PC] the text below. If it can be removed please let me know. Yes, I think you don't need the additional paragraph. ... > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- We may need to talk a little bit more about 5. ... > (2) All the examples in =C2=A73.2 have a /48 prefix allocated to the SRv6 > deployment (and then /64s per node). Is it possible to start with a > different SRv6 infrastructure allocation, a /64, or /96 maybe? If so, ple= ase > include an example. If not, please explain any limitations. > [PC] The examples are based on real deployments and as such reflect the [PC] practical aspects of those operators SRv6 infrastructure allocation [PC] designs. It would be counter-productive and misleading to provide [PC] artificially manufactured examples (and then why just /96 and not [PC] something else?). The document does not pose any limitations. I don't see how it can be misleading to provide a different example. The fact that all the examples have similar assumptions might give the impression that a limitation exists. =C2=A0I defer to you/AD. ... > (5) =C2=A74.11/=C2=A74.12 "S05. Learn the exposed MAC Source Address..." > > The note related to this step says that in "EVPN, the learning...is done = via > the control plane"...but here it is done via the data plane. What, if any= , > is the effect on EVPN operation? Are there issues with learning conflicti= ng > information from different sources? It seems to me that it could be > relatively easy to spoof the source and create unexpected entries in the = L2 > table. Please point to the EVPN documents where this type of operation is > considered. > [PC] Indeed, text is inaccurate. I've updated the note to the following: [PC] [PC] S03. In EVPN RFC7432, the learning of the exposed MAC Source Address i= s [PC] done via control plane. In L2VPN VPLS RFC4761 RFC4762 reachability is [PC] obtained by standard learning bridge functions in the data plane. I'm not sure if the updated note means that S03 doesn't apply to EVPN, or if it just confirms that EVPN expects to learn from the control plane. =C2=A0?? ... > (15) =C2=A78: A rogue node inside the SR domain may (on purpose) signal t= he wrong > behavior for a flow, which may result in the delivery of the traffic to t= he > wrong destination (potentially including destinations outside the domain)= , > among other things. Note that this action is possible even if the rogue n= ode > is authenticated and authorized to generate an SRH. I didn't find this > threat mentioned in rfc8402/rfc8754. > [PC] The control plane protocol specifics are outside the scope of this [PC] document. I am not able to parse this comment and what is it that need= s [PC] to be addressed in this document. Sorry, let me try again: In the data plane... =C2=A0A rogue SR headend may, on purpose, use the wrong endpoint SID. For example, an endpoint may support End.DT6 for several IPv6 tables. If the wrong SID is used, then the wrong table may be used to forward the packet. =C2=A0If multiple tenants have overlapping addresses, the packet may then be forwarded to the wrong destination. I believe that this is a new vulnerability introduced my this document that cannot be mitigated using the HMAC TLV, for example. =C2=A0IOW, the draft assumes that the SRH will be populated with the correct SIDs, but that may not always be the case if a node has been overtaken. There's not much that can be done to mitigate this issue, but I think it is important to mention. > (16) =C2=A79.4: I'm not sure what the purpose of =C2=A79 is, as a whole. = But the > summary in =C2=A79.4 puzzles me more; what is the intent? Does Table 1 in= dicate > that, for example, an IGP implementation should not advertise the > End.B6.Encaps behavior? > Does Table 2 indicate that only BGP-LS should signal the ability to > H.Encaps.L2? I am confused about the value/intent because the text clearl= y > says that the control plane is outside the scope of this document. > [PC] The section provides an overview of the role of control plane routing [PC] protocols in the advertisements of the SRv6 Locator and the SIDs along [PC] with their behaviors =E2=80=93 all new aspects that have been introduc= ed in this [PC] document. Based on the SRv6 solutions developed around the behaviors [PC] introduced in this document, it indicates what information is expected [PC] to be advertised via which protocol. It does not describe =E2=80=9Chow= =E2=80=9D since [PC] that is clearly outside the scope of this document and part of the [PC] individual routing protocol extensions. "it indicates what information is expected to be advertised via which proto= col" So...does that mean that an IGP is not expected to advertise H.Encaps.L2, or that it cannot advertise it? =C2=A0 I'm trying to figure out if there is any normative expectation -- I'm assuming not because it's been said several times that the control plane if out of scope. If the control plane is not bound by whatever this section says, then why do we even have it? I noticed that you wrote that the text is "Based on the SRv6 solutions developed around the behaviors introduced in this document", which I guess means that this is a reflection of the existing control plane drafts (??). =C2=A0If that is the case, then, at best, this seems like an attempt to put the carriage in front of the horses, knowing what the outcome may be, but without making reference to them. =C2=A0I still don't see the value. This is a non-blocking point -- I think this section can be removed and the value of the document wouldn't be reduced. =C2=A0I will defer to Martin. From nobody Wed Sep 30 00:29:11 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A0C273A12E4; Wed, 30 Sep 2020 00:29:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RxG_Lm1Puz5o; Wed, 30 Sep 2020 00:29:01 -0700 (PDT) Received: from cmccmta3.chinamobile.com (cmccmta3.chinamobile.com [221.176.66.81]) by ietfa.amsl.com (Postfix) with ESMTP id 9EB793A12DA; Wed, 30 Sep 2020 00:28:52 -0700 (PDT) Received: from spf.mail.chinamobile.com (unknown[172.16.121.13]) by rmmx-syy-dmz-app11-12011 (RichMail) with SMTP id 2eeb5f743399063-1d09b; Wed, 30 Sep 2020 15:28:25 +0800 (CST) X-RM-TRANSID: 2eeb5f743399063-1d09b X-RM-TagInfo: emlType=0 X-RM-SPAM-FLAG: 00000000 Received: from cmcc (unknown[10.2.53.197]) by rmsmtp-syy-appsvr07-12007 (RichMail) with SMTP id 2ee75f7433974ee-7c19a; Wed, 30 Sep 2020 15:28:25 +0800 (CST) X-RM-TRANSID: 2ee75f7433974ee-7c19a From: "Weiqiang Cheng" To: , "'Gyan Mishra'" , "'sander'" Cc: , , "'James Guichard'" References: <2129_1601282585_5F71A219_2129_373_1_53C29892C857584299CBF5D05346208A48F85067@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <2129_1601282585_5F71A219_2129_373_1_53C29892C857584299CBF5D05346208A48F85067@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Date: Wed, 30 Sep 2020 15:28:16 +0800 Message-ID: <000001d696fb$43d7eb70$cb87c250$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01D6973E.51FB2B70" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AQHWk2z0CUqAQ91KcUCPcBm+K0uBFal9qtVwgAMkfMA= Content-Language: zh-cn Archived-At: Subject: Re: [spring] Small SID/Compressed SID Design Team X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 07:29:10 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01D6973E.51FB2B70 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thank you for your comments to the design team. The design team works according to the roadmap as Bruno mentioned.=20 The progress is so far so good. We have finished the first version of = the requirement draft by Sep. 20th. =20 But, we realized that we need more time to finish the detailed review = within Design Team. Now we have twice meeting per week and hope we can post the draft before = the deadline of IETF 109 submission.=20 =20 We create a git-hub space to trace the work of the DT, and you can find = the meeting minutes and documents under discussion. Please access following link, if you hope to get more information. https://github.com/IETF-srcomp/documents =20 B.R. Weiqiang Cheng =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: bruno.decraene@orange.com = [mailto:bruno.decraene@orange.com]=20 =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B49=E6=9C=8828=E6=97=A5 = 16:43 =E6=94=B6=E4=BB=B6=E4=BA=BA: Gyan Mishra; =E7=A8=8B=E4=BC=9F=E5=BC=BA; = sander =E6=8A=84=E9=80=81: spring-chairs@ietf.org; spring@ietf.org; James = Guichard =E4=B8=BB=E9=A2=98: RE: [spring] Small SID/Compressed SID Design Team =20 Hi Gyan, =20 From: Gyan Mishra [mailto:hayabusagsm@gmail.com]=20 SID Design Team =20 =20 Hi Jim, Bruno & Joel =20 I was wondering if it would be possible to provide a brief synopsis or = debriefing of where we stand thus far with deliberations on Small SID / = Compression SID design team results. =20 I think that this is fair to leave this to the chairs of the DT. I have = asked them to provide an update of their planning to the WG. =20 Also an ETA for the WG as to when this project will be wrapped up and = the compression technique to be used with SRV6 finalized. =20 Dates may be set to DT and WG (e.g., via WG milestones), but in an = organization where people work on a voluntary basis, I would not call = those dates =E2=80=9CETA=E2=80=9D. And even before the notion of ETA (I=E2=80=99m guessing your emphasis is = on =E2=80=98Time=E2=80=99), there is the question of = =E2=80=98Arrival=E2=80=99. (and even before, the question of = =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ). The journey would probably be more effective if we all work together on = the achievement, rather than working side by side with different sub = groups each working a different destination. This may require a change = of paradigm from =E2=80=9CI want my solution to advance = (quickly)=E2=80=9D to =E2=80=9CI want a solution to advance = (quickly)=E2=80=9D. Alternatively, there would be multiple destinations = and multiple ETAs. =20 Coming back to the ETA, - To kick of the WG work, we have set a design team to work and = deliver two documents. - In IETF 108, the DT has presented a planning to the WG. - Following one feedback from the WG, WG chairs have asked the = DT to see if they could increase the level of effort and deliver faster. = They have gently agreed and provided an updated roadmap. Thank you for = their work, since they are the one doing the work. - I now realize that this new roadmap has not been sent to the = WG list. Sorry for that. Please find below o Stage 1: Prepare the requirement draft by end of September o - Phase 1: rough requirements list with several different = categories, by 20th of Aug.=20 o - Phase 2: one week for review by end of Aug. o - Phase 3: finish the draft by 20th of Sep. o - Phase 4: one week for review by end of Sep. o - Phase 5: Post it to WG and present it at IETF 109=20 o Discussion order: follow the time of items. o =20 o Stage 2: Prepare the analysis draft by end of November (expected = time, Let us talk about the schedule after the first draft finished.) o - Input: existing drafts by end of September o - Polling the drafts in WG mail list from Sep 1st to Sep = 30th and ensure all the existing drafts counted in.=20 - Based on the above, with a draft planned for end of = September, WG chairs had planned to set up a virtual interim meeting, = around mid October. (leaving two weeks for the WG to read and review the = draft).=20 - As of today, the above agenda is at risk. As we were planning = the virtual interim meeting with the DT, they replied that they were now = planning their first draft for November 4. =20 My suggestion is that with the finalized compression technique feature, = in order to provide complete parity as well as transparency with SRv6, = but also more importantly make it holistic as well as seamless the = change to operators, it would be good if this is made part of the base = SRv6 architecture and not a separate add on patch or workaround separate = feature if possible. This would make it as if SRv6 architecture had the = compression technique all along built into the architecture. This would = overall be very positive for SRv6. I think to accomplish this would = require updating the main SR architecture RFC 8402 and RFC 8754 and PGM = draft referencing the new compression technique as part of the inherent = architecture framework. Suggestion noted. I wish we were there, but the WG needs to first deliver on =E2=80=9Cthe = finalized compression technique feature=E2=80=9D. And if we end up with = N solutions, the above may be more difficult to perform and achieve. =20 Kind regards --Bruno =20 Kind Regards=20 =20 Gyan =20 =20 On Tue, Jun 30, 2020 at 12:30 PM James Guichard = wrote: =20 =20 Dear SPRING WG: =20 =20 =20 The WG chairs have been working with the relevant ADs to determine what = needs to be done to move the SPRING segment routing work related to IPv6 = along effectively. We are going to establish a design team as soon as = possible, with a specific objective to look at the compression-related work. =20 =20 =20 The design team charge is still being worked on, but roughly it will be = tasked to agree on a requirements proposal to the WG and a comparison = document to be evaluated by the WG. To be clear, as is the normal case = for the IETF, the design team outputs are input to the WG. Their output will not become a WG = document until the WG agrees to adopt it. Also, these documents are for = WG use. It will be for future analysis as to whether it is useful to = the larger community to publish them as RFCs. =20 =20 =20 While we have various thoughts as to membership in the design team, we = would like proposals for people we should include. We expect that there = are more people that we "should" include than can make up an effective = design time for the rapid delivery that we need. If you are willing to serve on the design team, = please let the chairs know. If there is someone you think would be good = on the design team, please ask them to let us know. We are NOT = soliciting evaluations of proposed people on the list. So, it is best if volunteers come to us directly. To be explicit, = the chairs will select the members of and the chair for this design = team. =20 =20 =20 We hope to appoint a small, effective, team that represents the varied = interests and concerns that have been expressed on the list. Folks = volunteering should understand that we hope you can move quickly, so it = will take a significant amount of your time. The deadline for volunteering is 6pm US PST this coming = Friday. =20 =20 =20 Thanks! =20 =20 =20 Jim, Joel & Bruno =20 =20 =20 =20 =20 =20 =20 =20 _______________________________________________ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring --=20 =20 Gyan Mishra Network Solutions Architect=20 M 301 502-1347 13101 Columbia Pike=20 Silver Spring, MD =20 _________________________________________________________________________= ________________________________________________ =20 Ce message et ses pieces jointes peuvent contenir des informations = confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez = recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme = ou falsifie. Merci. =20 This message and its attachments may contain confidential or privileged = information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and = delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have = been modified, changed or falsified. Thank you. ------=_NextPart_000_0001_01D6973E.51FB2B70 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

    Hi Gyan,

    Thank you for your comments to the design = team.

    The design team works according to the roadmap as Bruno mentioned. =

    The progress is so far so good. We have finished the first version of = the requirement draft by Sep. 20th.

     

    But, we realized that we need more time to finish the detailed review = within Design Team.

    Now we have twice meeting per week and hope we can post the draft = before the deadline of IETF 109 submission.

     

    We create a git-hub space to trace the work of the DT, and you can = find the meeting minutes and documents under = discussion.

    Please access following link, if you hope to get more = information.

    https://github.com/IETF-srcomp/documents

     

    B.R.

    Weiqiang Cheng

     

    =E5=8F=91=E4=BB= =B6=E4=BA=BA: = bruno.decraene@orange.com [mailto:bruno.decraene@orange.com] =
    =E5=8F=91=E9=80= =81=E6=97=B6=E9=97=B4: = 2020=E5=B9=B49=E6=9C=8828=E6=97=A5 16:43
    =E6=94=B6=E4=BB=B6=E4=BA=BA: Gyan Mishra; = =E7=A8=8B=E4=BC=9F=E5=BC=BA; = sander
    =E6=8A=84=E9=80=81: spring-chairs@ietf.org; = spring@ietf.org; James Guichard
    =E4=B8=BB=E9=A2=98: RE: [spring] Small = SID/Compressed SID Design = Team

     

    Hi Gyan,

     

    From: Gyan = Mishra [mailto:hayabusagsm@gmail.com]
    SID Design = Team

     

     

    Hi Jim, Bruno & = Joel

     

    I was wondering if it would be = possible to provide a brief synopsis or debriefing of where we stand = thus far with deliberations on Small SID / Compression SID design team = results.

     

    I think that this is fair to leave this to the chairs of the DT. I = have asked them to provide an update of their planning to the = WG.

     

    Also an ETA for the WG as to when this = project will be wrapped up and the compression technique to be used with = SRV6 finalized.

     

    Dates may be set to DT and WG (e.g., via WG milestones), but in an = organization where people work on a voluntary basis, I would not call = those dates =E2=80=9CETA=E2=80=9D.

    And even before the notion of ETA (I=E2=80=99m guessing your emphasis = is on =E2=80=98Time=E2=80=99), there is the question of = =E2=80=98Arrival=E2=80=99. (and even before, the question of = =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ).

    The journey would probably be more effective if we all work together = on the achievement, rather than working side by side with different sub = groups each working a different destination. This may require a change = of paradigm from =E2=80=9CI want my solution to advance = (quickly)=E2=80=9D to =E2=80=9CI want a solution to advance = (quickly)=E2=80=9D. Alternatively, there would be multiple destinations = and multiple ETAs.

     

    Coming back to the ETA,

    -          = To kick of the WG work, we have set a design team to work and deliver = two documents.

    -          = In IETF 108, the DT has presented a planning to the = WG.

    -          = Following one feedback from the WG, WG chairs have asked the DT to = see if they could increase the level of effort and deliver faster. They = have gently agreed and provided an updated roadmap. Thank you for their = work, since they are the one doing the work.

    -          = I now realize that this new roadmap has not been sent to the WG list. = Sorry for that. Please find below

    o   Stage 1: Prepare the requirement draft by end of = September

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Phase 1:=C2=A0 rough requirements list with several different = categories, by 20th of Aug.

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Phase 2:=C2=A0 one week for review by end of = Aug.

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Phase 3:=C2=A0 finish the draft by 20th of Sep.

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Phase 4:=C2=A0 one week for review by end of = Sep.

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Phase 5:=C2=A0 Post it to WG and present it at IETF 109 =

    o   =C2=A0=C2=A0=C2=A0Discussion order: follow the time of = items.

    o    

    o   Stage 2: Prepare the analysis draft by end of November = (expected time, Let us talk about the schedule after the first draft = finished.)

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Input: existing drafts by end of September

    o   -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= Polling the drafts in WG mail list from Sep 1st to Sep 30th and ensure = all the existing drafts counted in.

    -          = Based on the above, with a draft planned for end of September, WG = chairs had planned to set up a virtual interim meeting, around mid = October. (leaving two weeks for the WG to read and review the draft). =

    -          = As of today, the above agenda is at risk. As we were planning the = virtual interim meeting with the DT, they replied that they were now = planning their first draft for November 4.

     

    My suggestion is that with the finalized compression = technique feature,  in order to provide complete parity as well as = transparency with SRv6,  but also more importantly make it holistic = as well as seamless the change to operators, it would be good if this is = made part of the base SRv6 architecture and not a separate add on patch = or workaround separate feature if possible.  This would make it as if SRv6 architecture had the compression = technique all along built into the architecture.  This would = overall be very positive for SRv6.  I think to accomplish this = would require updating the main SR architecture RFC 8402 and RFC 8754 = and PGM draft referencing the new compression technique as part of the = inherent architecture framework.

    Suggestion noted.

    I wish we were there, but the WG needs to first deliver on = =E2=80=9Cthe finalized compression technique = feature=E2=80=9D. And if we end up with N solutions, the above may be more difficult = to perform and achieve.

     

    Kind regards

    --Bruno

     

    Kind = Regards 

     

    Gyan

     

     

    On Tue, Jun 30, 2020 at 12:30 PM James = Guichard <james.n.guichard@futurewei= .com> wrote:












    <= /p>

     

     

    Dear SPRING WG:

     

     

     

    The WG chairs have been working with the relevant ADs to = determine what needs to be done to move the SPRING segment routing work = related to IPv6 along effectively. We are going to establish a design = team as soon as possible, with a specific

    objective to look at = the compression-related work.

     

     

     

    The design team charge is still being worked on, but = roughly it will be tasked to agree on a requirements proposal to the WG = and a comparison document to be evaluated by the WG.  To be clear, = as is the normal case for the IETF, the design

    team outputs are = input to the WG.  Their output will not become a WG document until = the WG agrees to adopt it.  Also, these documents are for WG = use.  It will be for future analysis as to whether it is useful to = the larger community to publish them as RFCs.

     

     

     

    While we have various thoughts as to membership in the = design team, we would like proposals for people we should include. We = expect that there are more people that we "should" include = than can make up an effective design time for the rapid

    delivery = that we need.  If you are willing to serve on the design team, = please let the chairs know. If there is someone you think would be good = on the design team, please ask them to let us know.  We are NOT = soliciting evaluations of proposed people on the

    list.  So, = it is best if volunteers come to us directly. To be explicit, the chairs = will select the members of and the chair for this design = team.

     

     

     

    We hope to appoint a small, effective, team that represents = the varied interests and concerns that have been expressed on the = list.  Folks volunteering should understand that we hope you can = move quickly, so it will take a significant amount

    of your time. = The deadline for volunteering is 6pm US PST this coming = Friday.

     

     

     

    Thanks!

     

     

     

    Jim, Joel & Bruno

     

     

     

     

     

     

     

     





    _______________________________________________=

    spring mailing list

    spring@ietf.org

    https://www.ietf.org/mailman/listinfo/spring

    -- =

    =

    = Gyan = Mishra=

    = Network Solutions = Architect 

    = M = 301 502-1347
    13101 Columbia Pike 
    Silver Spring, = MD

     

    _______________________________________________________________=
__________________________________________________________
     
    Ce message et ses pieces jointes peuvent contenir des =
informations confidentielles ou privilegiees et ne doivent =
donc
    pas etre diffuses, =
exploites ou copies sans autorisation. Si vous avez recu ce message par =
erreur, veuillez le signaler
    a l'expediteur et le detruire ainsi que les pieces jointes. =
Les messages electroniques etant susceptibles =
d'alteration,
    Orange decline =
toute responsabilite si ce message a ete altere, deforme ou falsifie. =
Merci.
     
    This =
message and its attachments may contain confidential or privileged =
information that may be protected by =
law;
    they should not be =
distributed, used or copied without =
authorisation.
    If you have =
received this email in error, please notify the sender and delete this =
message and its attachments.
    As emails may be altered, Orange is not liable for messages =
that have been modified, changed or =
falsified.
    Thank =
you.
    ------=_NextPart_000_0001_01D6973E.51FB2B70-- From nobody Wed Sep 30 06:13:40 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id DCBF83A08CD; Wed, 30 Sep 2020 06:13:35 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160147161584.14492.15493518780575527518@ietfa.amsl.com> Date: Wed, 30 Sep 2020 06:13:35 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-23.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 13:13:36 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : SRv6 Network Programming Authors : Clarence Filsfils Pablo Camarillo Garvia John Leddy Daniel Voyer Satoru Matsushima Zhenbin Li Filename : draft-ietf-spring-srv6-network-programming-23.txt Pages : 42 Date : 2020-09-30 Abstract: The SRv6 Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet. This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-23 https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-23 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-23 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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aXZpbmcgYW55IG5vcm1hdGl2ZSBkZWZpbml0aW9uLiBJIHVuZGVyc3RhbmQgeW91ciBwb2ludCwg YnV0IEkgZG8gdGhpbmsgaXQgaGFzIHZhbHVlLiBJ4oCZbGwgY2hlY2sgd2l0aCBNYXJ0aW4uDQoN ClRoYW5rIHlvdSBmb3IgeW91ciB0aW1lLg0K From nobody Wed Sep 30 09:52:23 2020 Return-Path: X-Original-To: spring@ietf.org Delivered-To: spring@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9FDA23A0B57; Wed, 30 Sep 2020 09:52:17 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: spring@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.17.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: spring@ietf.org Message-ID: <160148473760.18795.10613810733315737683@ietfa.amsl.com> Date: Wed, 30 Sep 2020 09:52:17 -0700 Archived-At: Subject: [spring] I-D Action: draft-ietf-spring-segment-protection-sr-te-paths-00.txt X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 16:52:18 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Source Packet Routing in Networking WG of the IETF. Title : Segment Protection for SR-TE Paths Authors : Shraddha Hegde Chris Bowers Stephane Litkowski Xiaohu Xu Feng Xu Filename : draft-ietf-spring-segment-protection-sr-te-paths-00.txt Pages : 19 Date : 2020-09-30 Abstract: Segment routing supports the creation of explicit paths using Adj- Segment-ID (SID), Node-SIDs, and BSIDs. It is important to provide fast reroute (FRR) mechanisms to respond to failures of links and nodes in the Segment-Routed Traffic-Engineered(SR-TE) path. A point of local repair (PLR) can provide FRR protection against the failure of a link in an SR-TE path by examining only the first (top) label in the SR label stack. In order to protect against the failure of a node, a PLR may need to examine the second label in the stack as well, in order to determine SR-TE path beyond the failed node. This document specifies how a PLR can use the first and second label in the SR-MPLS label stack describing an SR-TE path to provide protection against node failures. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-spring-segment-protection-sr-te-paths/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-spring-segment-protection-sr-te-paths-00 https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-protection-sr-te-paths-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Sep 30 23:24:48 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2DA9C3A0AE9; Wed, 30 Sep 2020 23:24:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2gD7WXpnAqts; Wed, 30 Sep 2020 23:24:43 -0700 (PDT) Received: from mail-vs1-xe2c.google.com (mail-vs1-xe2c.google.com [IPv6:2607:f8b0:4864:20::e2c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 75EAB3A0AF9; Wed, 30 Sep 2020 23:24:43 -0700 (PDT) Received: by mail-vs1-xe2c.google.com with SMTP id e23so2088370vsk.2; Wed, 30 Sep 2020 23:24:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ZvSCNfesJyiovRvzGes9WydSa3uMKZ8Cucs5nLZUqiQ=; b=ZQBjdVCoprf5fNeHqQLxRNqnyNCQ7o3DWmfJorbwmuikinIUQkuZWO0AjnZfKS0ciy 3jvDHPxYpTILPem2GLfMVwzeNPBgV2AHO9micJhMDRpKrsVrLXQ1eEBJ4RzXZzzfRa9M RgY+tcVK4DW6P3Q117uqaVF0s8ZnasqevEHNP3DC5qy7qF+Q9+gf414u6BnPpCGWSgmT BtiZ3tT9nZZWvO2K1VMSamHtW8qy/329N66UB5wB2pExeaa1vBHRUgsFayju6ssJLgYz K0uYoAZWKpvwrYD5gcN5JBKEHqUmIyX0fK+/ZBBvcSJDKO4XObJT5jailF45m73TM/nP csnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ZvSCNfesJyiovRvzGes9WydSa3uMKZ8Cucs5nLZUqiQ=; b=gfbWQW8uVNlmBr/jV3ytgdAB9J9YavZ07t+h0MslHRuP2QgthWJbH/uzDKuOKVsNhe 3A8bMjIl8PXWXTFT2WHPY7VOyrSs4UQiDyJWoOc0n8tYgOP7ad7f5s9vRhzfjO6ezvU2 prPxF5G2s1SIQrqisV31Y36KiZUq2adogdENg2uwwKaqOBFlm/Ua0DylEb6x1pWRnh2H BXnwohbnpBkUQRLHSbO30sL3SHkEGazZygyTYdmaV2M/CsiI/R8GRzSTDrZkKxsViZBG nNEOhqKiCpmPAV1eGEozlZGzdtxbypR/1oKFt47ARpc6mXbTnbtD83vYHP1OPo0Pg+UA 8Qjg== X-Gm-Message-State: AOAM533snWxFlIeItGMVATk3J67IEYaBvcAyae1mwbE4TIrKCCQyUWix csqpcSA4z2AdKMD4Mc5N8dGinevR1q0Ft8Yg1pc= X-Google-Smtp-Source: ABdhPJwstFdQcRQrKFk8/w8DKOHxcw/ivnNu2NG6Mp03ZQlv3XLHKO45EbVx5hYKJDSdGSC35QTb6KG5iEH3ERsi40M= X-Received: by 2002:a67:df9a:: with SMTP id x26mr3699641vsk.5.1601533482232; Wed, 30 Sep 2020 23:24:42 -0700 (PDT) MIME-Version: 1.0 References: <2129_1601282585_5F71A219_2129_373_1_53C29892C857584299CBF5D05346208A48F85067@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <2129_1601282585_5F71A219_2129_373_1_53C29892C857584299CBF5D05346208A48F85067@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: Gyan Mishra Date: Thu, 1 Oct 2020 02:19:38 -0400 Message-ID: To: Bruno Decraene Cc: =?UTF-8?B?56iL5Lyf5by6?= , sander , "spring-chairs@ietf.org" , "spring@ietf.org" , James Guichard Content-Type: multipart/alternative; boundary="0000000000004df0a405b09612d6" Archived-At: Subject: Re: [spring] Small SID/Compressed SID Design Team X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Oct 2020 06:24:46 -0000 --0000000000004df0a405b09612d6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Bruno, On Mon, Sep 28, 2020 at 4:43 AM wrote: > Hi Gyan, > > > > *From:* Gyan Mishra [mailto:hayabusagsm@gmail.com] > SID Design Team > > > > > > Hi Jim, Bruno & Joel > > > > I was wondering if it would be possible to provide a brief synopsis or > debriefing of where we stand thus far with deliberations on Small SID / > Compression SID design team results. > > > > I think that this is fair to leave this to the chairs of the DT. I have > asked them to provide an update of their planning to the WG. > Gyan> Thank You > > > Also an ETA for the WG as to when this project will be wrapped up and the > compression technique to be used with SRV6 finalized. > > > > Dates may be set to DT and WG (e.g., via WG milestones), but in an > organization where people work on a voluntary basis, I would not call tho= se > dates =E2=80=9CETA=E2=80=9D. > > And even before the notion of ETA (I=E2=80=99m guessing your emphasis is = on > =E2=80=98Time=E2=80=99), there is the question of =E2=80=98Arrival=E2=80= =99. (and even before, the question > of =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ). > > The journey would probably be more effective if we all work together on > the achievement, rather than working side by side with different sub grou= ps > each working a different destination. This may require a change of paradi= gm > from =E2=80=9CI want my solution to advance (quickly)=E2=80=9D to =E2=80= =9CI want a solution to > advance (quickly)=E2=80=9D. Alternatively, there would be multiple destin= ations and > multiple ETAs. > > > > Coming back to the ETA, > > - To kick of the WG work, we have set a design team to work and > deliver two documents. > > - In IETF 108, the DT has presented a planning to the WG. > > - Following one feedback from the WG, WG chairs have asked the > DT to see if they could increase the level of effort and deliver faster. > They have gently agreed and provided an updated roadmap. Thank you for > their work, since they are the one doing the work. > > - I now realize that this new roadmap has not been sent to the > WG list. Sorry for that. Please find below > > o Stage 1: Prepare the requirement draft by end of September > > o - Phase 1: rough requirements list with several different > categories, by 20th of Aug. > > o - Phase 2: one week for review by end of Aug. > > o - Phase 3: finish the draft by 20th of Sep. > > o - Phase 4: one week for review by end of Sep. > > o - Phase 5: Post it to WG and present it at IETF 109 > > o Discussion order: follow the time of items. > > o > > o Stage 2: Prepare the analysis draft by end of November (expected > time, Let us talk about the schedule after the first draft finished.) > > o - Input: existing drafts by end of September > > o - Polling the drafts in WG mail list from Sep 1st to Sep > 30th and ensure all the existing drafts counted in. > > - Based on the above, with a draft planned for end of September, > WG chairs had planned to set up a virtual interim meeting, around mid > October. (leaving two weeks for the WG to read and review the draft). > > - As of today, the above agenda is at risk. As we were planning > the virtual interim meeting with the DT, they replied that they were now > planning their first draft for November 4. > > > > My suggestion is that with the finalized compression technique feature, > in order to provide complete parity as well as transparency with SRv6, > but also more importantly make it holistic as well as seamless the chang= e > to operators, it would be good if this is made part of the base SRv6 > architecture and not a separate add on patch or workaround separate featu= re > if possible. This would make it as if SRv6 architecture had the > compression technique all along built into the architecture. This would > overall be very positive for SRv6. I think to accomplish this would > require updating the main SR architecture RFC 8402 and RFC 8754 and PGM > draft referencing the new compression technique as part of the inherent > architecture framework. > > Suggestion noted. > > I wish we were there, but the WG needs to first deliver on =E2=80=9Cthe f= inalized > compression technique feature=E2=80=9D. And if we end up with N solutions= , the > above may be more difficult to perform and achieve. > > > Gyan> Thank you for the DT update & considerations on my suggestion. I understand this is a complex undertaking and hats off to the DT team for all the work put in to get this solution finalized. Look forward to the virtual interim meeting, draft post on 11/4 and presentation at IETF 109. =F0=9F=98=83 > Kind regards > > --Bruno > > > > Kind Regards > > > > Gyan > > > > > > On Tue, Jun 30, 2020 at 12:30 PM James Guichard < > james.n.guichard@futurewei.com> wrote: > > > > > > > > > > > > > > > > > Dear SPRING WG: > > > > > > > > The WG chairs have been working with the relevant ADs to determine what > needs to be done to move the SPRING segment routing work related to IPv6 > along effectively. We are going to establish a design team as soon as > possible, with a specific > > objective to look at the compression-related work. > > > > > > > > The design team charge is still being worked on, but roughly it will be > tasked to agree on a requirements proposal to the WG and a comparison > document to be evaluated by the WG. To be clear, as is the normal case f= or > the IETF, the design > > team outputs are input to the WG. Their output will not become a WG > document until the WG agrees to adopt it. Also, these documents are for = WG > use. It will be for future analysis as to whether it is useful to the > larger community to publish them as RFCs. > > > > > > > > While we have various thoughts as to membership in the design team, we > would like proposals for people we should include. We expect that there a= re > more people that we "should" include than can make up an effective design > time for the rapid > > delivery that we need. If you are willing to serve on the design team, > please let the chairs know. If there is someone you think would be good o= n > the design team, please ask them to let us know. We are NOT soliciting > evaluations of proposed people on the > > list. So, it is best if volunteers come to us directly. To be explicit, > the chairs will select the members of and the chair for this design team. > > > > > > > > We hope to appoint a small, effective, team that represents the varied > interests and concerns that have been expressed on the list. Folks > volunteering should understand that we hope you can move quickly, so it > will take a significant amount > > of your time. The deadline for volunteering is 6pm US PST this coming > Friday. > > > > > > > > Thanks! > > > > > > > > Jim, Joel & Bruno > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- > > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike *Silver Spring, MD > > > > _________________________________________________________________________= ________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > Thank you. > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000004df0a405b09612d6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi Bruno,

    On Mon, Sep 28, 2020 at 4:43 AM = <bruno.decraene@orange.com<= /a>> wrote:

    Hi Gyan,=

    =C2=A0

    =C2=A0

    =C2=A0

    Hi Jim, Bruno & Joel

    =C2=A0

    I was wondering if it would be possible to provide a= brief synopsis or debriefing of where we stand thus far with deliberations= on Small SID / Compression SID design team results.

    =C2=A0

    I think that this is fair to = leave this to the chairs of the DT. I have asked them to provide an update of their planning to the WG.


    =C2=A0 =C2=A0 =C2=A0 Gyan> Th= ank You=C2=A0

    =C2=A0

    A= lso an ETA for the WG as to when this project will be wrapped up and= the compression technique to be used with SRV6 finalized.

    =C2=A0

    Dates may be set to DT and WG= (e.g., via WG milestones), but in an organization where people work on a voluntary basis, I would not call those dates =E2=80=9CET= A=E2=80=9D.

    And even before the notion of= ETA (I=E2=80=99m guessing your emphasis is on =E2=80=98Time=E2=80=99), the= re is the question of =E2=80=98Arrival=E2=80=99. (and even before, the questi= on of =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ).

    The journey would probably be= more effective if we all work together on the achievement, rather than working side by side = with different sub groups each working a different destination. This may re= quire a change of paradigm from =E2=80=9CI want my solution to advance (qui= ckly)=E2=80=9D to =E2=80=9CI want a solution to advance (quickly)=E2=80=9D. Alternatively= , there would be multiple destinations and multiple ETAs.

    =C2=A0

    Coming back to the ETA,

    -= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 To kick of the WG work, = we have set a design team to work and deliver two documents.

    -= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In IETF 108, the DT has = presented a planning to the WG.

    -= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Following one feedback f= rom the WG, WG chairs have asked the DT to see if they could increase the level of effort and deliver faster. They have gent= ly agreed and provided an updated roadmap. Thank you for their work, since = they are the one doing the work.

    -= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I now realize that this = new roadmap has not been sent to the WG list. Sorry for that. Please find below

    <= span>o=C2=A0=C2=A0 Stage 1: Prepare the requi= rement draft by end of September

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 1:=C2=A0 rough requirements list with several dif= ferent categories, by 20th of Aug.

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 2:=C2=A0 one week for review by end of Aug.

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 3:=C2=A0 finish the draft by 20th of Sep.<= u>

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 4:=C2=A0 one week for review by end of Sep.

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 5:=C2=A0 Post it to WG and present it at IETF 109

    <= span>o=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0Discussion order: follow the time of items.

    <= span>o=C2=A0=C2=A0 =C2=A0

    <= span>o=C2=A0=C2=A0 Stage 2: Prepare the analy= sis draft by end of November (expected time, Let us talk about the schedule= after the first draft finished.)

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Input: existing drafts by end of September

    <= span>o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Polling the drafts in WG mail list from Sep 1st to Sep 30th and ensu= re all the existing drafts counted in.

    -= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Based on the above, with= a draft planned for end of September, WG chairs had planned to set up a virtual interim meeting, around mid October. (leaving two weeks for= the WG to read and review the draft).

    -=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 As of today, the above a= genda is at risk. As we were planning the virtual interim meeting with the DT, they replied that they were now planning thei= r first draft for November 4.

    =C2=A0

    My suggestion is that with the = finalized compression technique feature, =C2=A0in order to provide complete= parity as well as transparency with SRv6, =C2=A0but also more importantly = make it holistic as well as seamless the change to operators, it would be good if this is m= ade part of the base SRv6 architecture and not a separate add on patch or w= orkaround separate feature if possible.=C2=A0 This would= make it as if SRv6 architecture had the compression technique all along b= uilt into the architecture.=C2=A0 This would overall be very positive for S= Rv6.=C2=A0 I think to accomplish this would require updating the main SR ar= chitecture RFC 8402 and RFC 8754 and PGM draft referencing the new compression technique as part of the inherent architecture framework.=

    Suggestion noted.

    I wish we were there, but the= WG needs to first deliver on =E2=80=9Cthe finalized compression technique feature=E2=80=9D. And if we end up with N solutions, the above may be more difficult to perform and achieve.

    =C2=A0

    =C2=A0 =C2=A0 =C2=A0 =C2=A0Gyan> Th= ank you for the DT update & considerations on my suggestion. I understa= nd this is a complex undertaking and hats off to the DT team for all the wo= rk put in to get this solution finalized.=C2=A0 Look forward to the virtual= interim meeting, draft post on 11/4 and presentation at IETF 109.=C2=A0=F0= =9F=98=83=C2=A0
    =C2=A0

    Kind regards

    --Bruno<= /p>

    =C2=A0

    K= ind Regards=C2=A0

    =C2=A0

    Gyan

    =C2=A0

    =C2=A0

    On Tue, Jun 30, 2020 at 12:30 PM James Guichard <= james.n= .guichard@futurewei.com> wrote:












    =C2=A0

    =C2=A0

    Dear SPRING WG:

    =C2=A0

    =C2=A0

    =C2=A0

    The WG chairs have been working= with the relevant ADs to determine what needs to be done to move the SPRIN= G segment routing work related to IPv6 along effectively. We are going to establish a design team= as soon as possible, with a specific

    objective to look at the compression-related work.

    =C2=A0

    =C2=A0

    =C2=A0

    The design team charge is still= being worked on, but roughly it will be tasked to agree on a requirements = proposal to the WG and a comparison document to be evaluated by the WG.=C2=A0 To be clear, as is = the normal case for the IETF, the design

    team outputs are input to the WG.=C2=A0 Their output will not become a WG d= ocument until the WG agrees to adopt it.=C2=A0 Also, these documents are fo= r WG use.=C2=A0 It will be for future analysis as to whether it is useful t= o the larger community to publish them as RFCs.

    =C2=A0

    =C2=A0

    =C2=A0

    While we have various thoughts = as to membership in the design team, we would like proposals for people we = should include. We expect that there are more people that we "should" include than can mak= e up an effective design time for the rapid

    delivery that we need.=C2=A0 If you are willing to serve on the design team= , please let the chairs know. If there is someone you think would be good o= n the design team, please ask them to let us know.=C2=A0 We are NOT solicit= ing evaluations of proposed people on the

    list.=C2=A0 So, it is best if volunteers come to us directly. To be explici= t, the chairs will select the members of and the chair for this design team= .

    =C2=A0

    =C2=A0

    =C2=A0

    We hope to appoint a small, eff= ective, team that represents the varied interests and concerns that have be= en expressed on the list.=C2=A0 Folks volunteering should understand that we hope you can move= quickly, so it will take a significant amount

    of your time. The deadline for volunteering is 6pm US PST this coming Frida= y.

    =C2=A0

    =C2=A0

    =C2=A0

    Thanks!

    =C2=A0

    =C2=A0

    =C2=A0

    Jim, Joel & Bruno=

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0





    _______________________________________________

    spring mailing list

    spring@ietf.org
    = https://www.ietf.org/mailman/listinfo/spring

    --

    Gyan Mishra

    Network Solutions Architect=C2=A0

    M 301 502-1347
    13101 Columbia Pike=C2=A0
    Silver Spring, MD

    =C2=A0

    ______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.


    --

    Gyan Mishra

    Network Solutions A= rchitect=C2= =A0

    M 301 502-1347
    13101 Columbia= Pike=C2=A0
    Silver Spring, MD


    <= /div>
    --0000000000004df0a405b09612d6-- From nobody Wed Sep 30 23:28:21 2020 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7CE423A0AE6; Wed, 30 Sep 2020 23:28:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0rU07GCopHqk; Wed, 30 Sep 2020 23:28:15 -0700 (PDT) Received: from mail-vk1-xa30.google.com (mail-vk1-xa30.google.com [IPv6:2607:f8b0:4864:20::a30]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1BA4E3A0AE3; Wed, 30 Sep 2020 23:28:15 -0700 (PDT) Received: by mail-vk1-xa30.google.com with SMTP id e5so843390vkm.2; Wed, 30 Sep 2020 23:28:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=InKKFntYcRI0sgFKNeBYgBfkm/lKCD/FXu+WelV3qhA=; b=Fpzh4tmyeH4yHAz0MLnCNSQliiT3abJn3UqClsaodbTK+vm0HqTtE50HaW2VITkO3R LoCdTrvywMLaI0DxuIEGKxcWPFJxVjOWYF691RZOzDHXS8UpPrG4rOCjlxxm1YGPUXCj n7lRXRh9V3/4K/NSz1/1dsHQpP3EZqrwm1M5vClNKVNCIuKrhM35pevoz6Pkq8mqc/+T tsHoycYixhFwo575hJk8r4Q3qo0F+lFIC6zAb7KvtqwhdJ5HYqEqW9bj3KdZ633dlNCc nIrno9wfk9cRB3XwysP/EVj2mZhix9edRPJ+CeU7UYZeUE0d4ezovVFeGkffw4UdUxrr eNRg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=InKKFntYcRI0sgFKNeBYgBfkm/lKCD/FXu+WelV3qhA=; b=RbgNd4nCC3xex7inv54enKuUtXmBKImjyw+KmkrvulUlA7nKMUiGYIkkl4XFkdWlvx GcXYkhOJ0GR8Uig1cieF7WSbeT1N/DLvuXA9pvcxAwWFed3dPD6xBD1DNB5cgDUBwPp/ HVSQtE5WOsk5fJY3q/fb01xP8VO42L60jofByhe9oTxRCJIodJ/An/TiQVXul3FExEoA E6ZmFSpkR4maxTyfxcc0MUdrRa81X074Gs+5s9bg/DvVH815d+9S+6YA7jilWnyK0QE+ zdNHc9DlJFMl2Q5WvWAXic6hcjWWifClh6IyaR5o2e7fLAyJFMUWHCSvB/efjdBVlHVf RUzg== X-Gm-Message-State: AOAM532Dt9Rr7vrjO48rMvaB4/gqJOr/fHS48eki8GTEzvSSYmDpvMvO qsFCNXKM3DLgHXMiYQk9f/w3PYVsOpJMHIe6au0= X-Google-Smtp-Source: ABdhPJwlNgW9NLmJuMrfgTidsMn9F/eenZd96am1N4HjBdLoMC7rJKC3olPLiga8kwFVQdd7ANbn7NfjXSGoctBa4lk= X-Received: by 2002:a1f:a5d2:: with SMTP id o201mr3669570vke.15.1601533694013; Wed, 30 Sep 2020 23:28:14 -0700 (PDT) MIME-Version: 1.0 References: <2129_1601282585_5F71A219_2129_373_1_53C29892C857584299CBF5D05346208A48F85067@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <000001d696fb$43d7eb70$cb87c250$@com> In-Reply-To: <000001d696fb$43d7eb70$cb87c250$@com> From: Gyan Mishra Date: Thu, 1 Oct 2020 02:23:10 -0400 Message-ID: To: Weiqiang Cheng Cc: Bruno Decraene , sander , spring-chairs@ietf.org, SPRING WG , James Guichard Content-Type: multipart/alternative; boundary="000000000000ed742705b0961e28" Archived-At: Subject: Re: [spring] Small SID/Compressed SID Design Team X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Oct 2020 06:28:19 -0000 --000000000000ed742705b0961e28 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Very welcome. Glad to hear that the DT is making good progress and sounds like on target to the dates Bruno mentioned. Thank you for the Github link Kind Regards Gyan On Wed, Sep 30, 2020 at 3:28 AM Weiqiang Cheng < chengweiqiang@chinamobile.com> wrote: > Hi Gyan, > > Thank you for your comments to the design team. > > The design team works according to the roadmap as Bruno mentioned. > > The progress is so far so good. We have finished the first version of the > requirement draft by Sep. 20th. > > > > But, we realized that we need more time to finish the detailed review > within Design Team. > > Now we have twice meeting per week and hope we can post the draft before > the deadline of IETF 109 submission. > > > > We create a git-hub space to trace the work of the DT, and you can find > the meeting minutes and documents under discussion. > > Please access following link, if you hope to get more information. > > https://github.com/IETF-srcomp/documents > > > > B.R. > > Weiqiang Cheng > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* bruno.decraene@orange.com [mailto:bruno.de= craene@orange.com] > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B49=E6=9C=8828=E6=97= =A5 16:43 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Gyan Mishra; =E7=A8=8B=E4=BC=9F=E5=BC=BA; = sander > *=E6=8A=84=E9=80=81:* spring-chairs@ietf.org; spring@ietf.org; James Guic= hard > *=E4=B8=BB=E9=A2=98:* RE: [spring] Small SID/Compressed SID Design Team > > > > Hi Gyan, > > > > *From:* Gyan Mishra [mailto:hayabusagsm@gmail.com] > SID Design Team > > > > > > Hi Jim, Bruno & Joel > > > > I was wondering if it would be possible to provide a brief synopsis or > debriefing of where we stand thus far with deliberations on Small SID / > Compression SID design team results. > > > > I think that this is fair to leave this to the chairs of the DT. I have > asked them to provide an update of their planning to the WG. > > > > Also an ETA for the WG as to when this project will be wrapped up and the > compression technique to be used with SRV6 finalized. > > > > Dates may be set to DT and WG (e.g., via WG milestones), but in an > organization where people work on a voluntary basis, I would not call tho= se > dates =E2=80=9CETA=E2=80=9D. > > And even before the notion of ETA (I=E2=80=99m guessing your emphasis is = on > =E2=80=98Time=E2=80=99), there is the question of =E2=80=98Arrival=E2=80= =99. (and even before, the question > of =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ). > > The journey would probably be more effective if we all work together on > the achievement, rather than working side by side with different sub grou= ps > each working a different destination. This may require a change of paradi= gm > from =E2=80=9CI want my solution to advance (quickly)=E2=80=9D to =E2=80= =9CI want a solution to > advance (quickly)=E2=80=9D. Alternatively, there would be multiple destin= ations and > multiple ETAs. > > > > Coming back to the ETA, > > - To kick of the WG work, we have set a design team to work and > deliver two documents. > > - In IETF 108, the DT has presented a planning to the WG. > > - Following one feedback from the WG, WG chairs have asked the > DT to see if they could increase the level of effort and deliver faster. > They have gently agreed and provided an updated roadmap. Thank you for > their work, since they are the one doing the work. > > - I now realize that this new roadmap has not been sent to the > WG list. Sorry for that. Please find below > > o Stage 1: Prepare the requirement draft by end of September > > o - Phase 1: rough requirements list with several different > categories, by 20th of Aug. > > o - Phase 2: one week for review by end of Aug. > > o - Phase 3: finish the draft by 20th of Sep. > > o - Phase 4: one week for review by end of Sep. > > o - Phase 5: Post it to WG and present it at IETF 109 > > o Discussion order: follow the time of items. > > o > > o Stage 2: Prepare the analysis draft by end of November (expected > time, Let us talk about the schedule after the first draft finished.) > > o - Input: existing drafts by end of September > > o - Polling the drafts in WG mail list from Sep 1st to Sep > 30th and ensure all the existing drafts counted in. > > - Based on the above, with a draft planned for end of September, > WG chairs had planned to set up a virtual interim meeting, around mid > October. (leaving two weeks for the WG to read and review the draft). > > - As of today, the above agenda is at risk. As we were planning > the virtual interim meeting with the DT, they replied that they were now > planning their first draft for November 4. > > > > My suggestion is that with the finalized compression technique feature, > in order to provide complete parity as well as transparency with SRv6, > but also more importantly make it holistic as well as seamless the chang= e > to operators, it would be good if this is made part of the base SRv6 > architecture and not a separate add on patch or workaround separate featu= re > if possible. This would make it as if SRv6 architecture had the > compression technique all along built into the architecture. This would > overall be very positive for SRv6. I think to accomplish this would > require updating the main SR architecture RFC 8402 and RFC 8754 and PGM > draft referencing the new compression technique as part of the inherent > architecture framework. > > Suggestion noted. > > I wish we were there, but the WG needs to first deliver on =E2=80=9Cthe f= inalized > compression technique feature=E2=80=9D. And if we end up with N solutions= , the > above may be more difficult to perform and achieve. > > > > Kind regards > > --Bruno > > > > Kind Regards > > > > Gyan > > > > > > On Tue, Jun 30, 2020 at 12:30 PM James Guichard < > james.n.guichard@futurewei.com> wrote: > > > > > > > > > > > > > > > > > Dear SPRING WG: > > > > > > > > The WG chairs have been working with the relevant ADs to determine what > needs to be done to move the SPRING segment routing work related to IPv6 > along effectively. We are going to establish a design team as soon as > possible, with a specific > > objective to look at the compression-related work. > > > > > > > > The design team charge is still being worked on, but roughly it will be > tasked to agree on a requirements proposal to the WG and a comparison > document to be evaluated by the WG. To be clear, as is the normal case f= or > the IETF, the design > > team outputs are input to the WG. Their output will not become a WG > document until the WG agrees to adopt it. Also, these documents are for = WG > use. It will be for future analysis as to whether it is useful to the > larger community to publish them as RFCs. > > > > > > > > While we have various thoughts as to membership in the design team, we > would like proposals for people we should include. We expect that there a= re > more people that we "should" include than can make up an effective design > time for the rapid > > delivery that we need. If you are willing to serve on the design team, > please let the chairs know. If there is someone you think would be good o= n > the design team, please ask them to let us know. We are NOT soliciting > evaluations of proposed people on the > > list. So, it is best if volunteers come to us directly. To be explicit, > the chairs will select the members of and the chair for this design team. > > > > > > > > We hope to appoint a small, effective, team that represents the varied > interests and concerns that have been expressed on the list. Folks > volunteering should understand that we hope you can move quickly, so it > will take a significant amount > > of your time. The deadline for volunteering is 6pm US PST this coming > Friday. > > > > > > > > Thanks! > > > > > > > > Jim, Joel & Bruno > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://www.ietf.org/mailman/listinfo/spring > > -- > > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > > they should not be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > > Thank you. > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000ed742705b0961e28 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

    Very welcome. Glad to hear= that the DT is making good progress and sounds like on target to the dates= Bruno mentioned.=C2=A0=C2=A0

    Thank you for the Gi= thub link

    Kind Regards

    Gy= an

    On Wed, Sep 30, 2020 at 3:28 AM Weiqiang Cheng <chengweiqiang@chinamobile.com> wrote:
    =

    Hi Gyan,

    Thank you for your comments to the desi= gn team.

    The design team works according to the roadmap as Bruno mentioned.

    The = progress is so far so good. We have finished the first version of the requi= rement draft by Sep. 20th.

    <= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-seri= f;color:rgb(31,73,125)">=C2=A0

    But, we realized that we need more time to fini= sh the detailed review within Design Team.

    Now we have twice meeting per week = and hope we can post the draft before the deadline of IETF 109 submission. =

    <= u>=C2=A0

    We create a git-hub space to trace the work of the DT, and you can find = the meeting minutes and documents under discussion.

    Please access following li= nk, if you hope to get more information.

    https://github.com/IETF-srcomp/document= s

    =C2=A0

    B.R.

    Weiqiang Cheng

    =C2=A0

    =E5=8F=91=E4=BB=B6=E4=BA=BA<= span lang=3D"EN-US">: bruno.decraene@orange.com [mailto:bruno.decraene@oran= ge.com]
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B49=E6=9C=8828=E6=97=A5 16:43
    =E6= =94=B6=E4=BB=B6=E4=BA=BA: Gyan Mishra; =E7=A8=8B=E4=BC=9F=E5=BC=BA; s= ander
    =E6=8A=84=E9=80=81: spring-chairs@ietf.org; spring@ietf.org; James Guichard
    =E4=B8=BB=E9=A2=98= : RE: [spring] Small S= ID/Compressed SID Design Team

    =C2=A0

    Hi Gyan,

    =C2=A0=

    From: Gyan Mishra [mailto:hayabusagsm@gmail.com]
    SID Design Team    =

    =C2=A0

    =C2= =A0

    Hi= Jim, Bruno & Joel

    =C2=A0

    I was wondering if it would be possible to= provide a brief synopsis or debriefing of where we stand thus far with del= iberations on Small SID / Compression SID design team results.

    =C2=A0=

    I think that this = is fair to leave this to the chairs of the DT. I have asked them to provide= an update of their planning to the WG.

    =

    =C2=A0

    =

    Also an ETA for the WG = as to when this project will be wrapped up and the compression technique to= be used with SRV6 finalized.

    =C2=A0

    Dates may be set to DT and WG (e.g., via WG mile= stones), but in an organization where people work on a voluntary basis, I w= ould not call those dates =E2=80=9CETA=E2=80=9D.

    And even before the notion of E= TA (I=E2=80=99m guessing your emphasis is on =E2=80=98Time=E2=80=99), there= is the question of =E2=80=98Arrival=E2=80=99. (and even before, the questi= on of =E2=80=98Destination=E2=80=99(s)=E2=80=A6 ).

    =

    The journey would probably be= more effective if we all work together on the achievement, rather than wor= king side by side with different sub groups each working a different destin= ation. This may require a change of paradigm from =E2=80=9CI want my soluti= on to advance (quickly)=E2=80=9D to =E2=80=9CI want a solution to advance (= quickly)=E2=80=9D. Alternatively, there would be multiple destinations and = multiple ETAs.

    =C2=A0

    Coming back to the ETA,

    <= span>-=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 To kick of the WG work, we have set a design team to work a= nd deliver two documents.

    -=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 In IETF 108, the DT has presented a planning to the WG.

    <= span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;= color:rgb(31,73,125)">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Following one feedback from the WG, W= G chairs have asked the DT to see if they could increase the level of effor= t and deliver faster. They have gently agreed and provided an updated roadm= ap. Thank you for their work, since they are the one doing the work.=

    -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I now realize that this new = roadmap has not been sent to the WG list. Sorry for that. Please find below=

    o=C2=A0=C2=A0 Stage 1: Prepare the requirement draft by end of September<= /span>

    o= =C2=A0=C2=A0 -=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 1:=C2=A0 rough requi= rements list with several different categories, by 20th of Aug. <= /u>

    o=C2=A0=C2=A0 -=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 2:=C2=A0 one w= eek for review by end of Aug.

    o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 Phase 3:=C2=A0 finish the draft by 20th of Sep.

    o=C2=A0=C2=A0 -=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phase 4:=C2=A0 one w= eek for review by end of Sep.

    o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 Phase 5:=C2=A0 Post it to WG and present it at IETF 109 =

    o=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0Discussion order: follow the time of items.

    o=C2=A0=C2=A0 =C2= =A0

    o=C2=A0=C2=A0 St= age 2: Prepare the analysis draft by end of November (expected time, Let us= talk about the schedule after the first draft finished.)

    o=C2= =A0=C2=A0 -=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Input: existing drafts by end= of September

    o=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 Polling the drafts in WG mail list from Sep 1st to Sep 30th and ensure = all the existing drafts counted in.

    <= span>-=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Based on the above, with a draft planned for end of Septemb= er, WG chairs had planned to set up a virtual interim meeting, around mid O= ctober. (leaving two weeks for the WG to read and review the draft).

    -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = As of today, the above agenda i= s at risk. As we were planning the virtual interim meeting with the DT, the= y replied that they were now planning their first draft for November 4.

    =C2=A0

    My suggestion= is that with the finalized compression technique feature, =C2=A0in order t= o provide complete parity as well as transparency with SRv6, =C2=A0but also= more importantly make it holistic as well as seamless the change to operat= ors, it would be good if this is made part of the base SRv6 architecture an= d not a separate add on patch or workaround separate feature if possible.= =C2=A0 This would make it as if SRv6 architecture = had the compression technique all along built into the architecture.=C2=A0 = This would overall be very positive for SRv6.=C2=A0 I think to accomplish t= his would require updating the main SR architecture RFC 8402 and RFC 8754 a= nd PGM draft referencing the new compression technique as part of the inher= ent architecture framework.

    = Suggestion noted.

    I wish we were there, but the WG need= s to first deliver on =E2=80=9Cthe finalized co= mpression technique feature=E2=80=9D. And if = we end up with N solutions, the above may be more difficult to perform and = achieve.

    =C2=A0

    Kind regards

    --Bruno

    =C2=A0

    Kind Regards=C2=A0

    =C2=A0<= /span>

    Gyan

    = =C2=A0

    =C2=A0

    On Tue, Jun 30, 2020 at 12:30 PM James Guichard <james.n.guichard@futur= ewei.com> wrote:




    <= br>






    =C2=A0=

    =C2=A0

    Dear SPRING WG:

    =C2=A0

    =C2=A0

    =C2=A0

    The WG chairs have been working with the relevant ADs to determi= ne what needs to be done to move the SPRING segment routing work related to= IPv6 along effectively. We are going to establish a design team as soon as= possible, with a specific

    objective to look at the compression-rela= ted work.

    =C2=A0

    =C2=A0

    =C2=A0<= u>

    The design tea= m charge is still being worked on, but roughly it will be tasked to agree o= n a requirements proposal to the WG and a comparison document to be evaluat= ed by the WG.=C2=A0 To be clear, as is the normal case for the IETF, the de= sign

    team outputs are input to the WG.=C2=A0 Their output will not b= ecome a WG document until the WG agrees to adopt it.=C2=A0 Also, these docu= ments are for WG use.=C2=A0 It will be for future analysis as to whether it= is useful to the larger community to publish them as RFCs.

    =C2=A0

    =C2=A0

    =C2=A0

    While we have various thoughts as to me= mbership in the design team, we would like proposals for people we should i= nclude. We expect that there are more people that we "should" inc= lude than can make up an effective design time for the rapid

    deliver= y that we need.=C2=A0 If you are willing to serve on the design team, pleas= e let the chairs know. If there is someone you think would be good on the d= esign team, please ask them to let us know.=C2=A0 We are NOT soliciting eva= luations of proposed people on the

    list.=C2=A0 So, it is best if vol= unteers come to us directly. To be explicit, the chairs will select the mem= bers of and the chair for this design team.

    = =C2=A0

    =C2=A0<= u>

    =C2=A0

    We hope to appoint a small, effective, team that repr= esents the varied interests and concerns that have been expressed on the li= st.=C2=A0 Folks volunteering should understand that we hope you can move qu= ickly, so it will take a significant amount

    of your time. The deadli= ne for volunteering is 6pm US PST this coming Friday.    <= /p>

    =C2=A0

    =C2=A0

    =C2=A0

    Thanks!

    =C2=A0

    =C2=A0

    =C2=A0

    Jim, Joel & Bruno

    =C2=A0<= /u>

    =C2=A0<= /u>

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0

    =C2=A0




    <= br>_______________________________________________

    spring mailing li= st

    spring@ietf.= org

    https://www.ietf.org/mailman/listinfo/spring

    --

    Gyan Mishra

    Network Solutions Architect=C2=A0

    M 301 502-1347
    13101 Columbia Pike=C2=A0
    Silver Spring, MD=

    =C2=A0

    _______________________________________________________= __________________________________________________________________
    =C2=A0
    <= pre>Ce message et ses pieces jointes peuvent contenir des= informations confidentielles ou privilegiees et ne doivent donc<= /u>
    pas etre diffuses, exploites ou copi=
es sans autorisation. Si vous avez recu ce message par erreur, veuillez le =
signaler
    a l'expediteu=
r et le detruire ainsi que les pieces jointes. Les messages electroniques e=
tant susceptibles d'alteration,
    Orange decline toute responsabilite si ce message a ete altere, d=
eforme ou falsifie. Merci.
    =C2=A0
    This message and i=
ts attachments may contain confidential or privileged information that may =
be protected by law;
    they =
should not be distributed, used or copied without authorisation.<=
/u>
    If you have received this email in e=
rror, please notify the sender and delete this message and its attachments.=

    As emails may be altered,=
 Orange is not liable for messages that have been modified, changed or fals=
ified.
    Thank you.

    --
    <= div dir=3D"ltr">


    Gyan Mishra

    Network Solutions Architect=C2=A0

    M 30= 1 502-1347
    13101 Columbia Pike=C2=A0
    Silver Spring, MD

    =

    --000000000000ed742705b0961e28--

    Hi All,

     

    Section 4.1.21:

     

    In control plane uA SID is advertised with value 2001:db8:0:0N0= 0:FNAJ::

     

    in FIB entry it is represent with value 2001:db8:0<= b>:FNAJ::/64

    Note: From a formal viewpoint, a uA SID of n= ode N is defined by the

    local FIB entry B:uA/64 of N (i.e. this defi= nition is independent from any uN SID of node N).

     

    a) why such discrepancy ? between control pl= ane and forwarding plane.

    b) for uA SID Forwarding happens based upon = 2001:db8:0/48 ? not based upon 2001:db8:0:0N00= (uN SID) ?

       uSID block:= 2001:db8:0::/48<= /p>

       for uA SID = if forwarding is based upon 2001:db8:0/48 then Compressed-SID can be 16 bit

       for uA SID if forwarding i= s based upon 2001:db8:0:0N00 then Compressed= -SID must be 32 bit

     

    Thanks

    Rajesh

     

     


    Juniper Business= Use Only