
From loa@pi.nu  Sun Dec  1 08:59:53 2013
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Date: Mon, 02 Dec 2013 00:59:37 +0800
From: Loa Andersson <loa@pi.nu>
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Cc: Lou Berger <lberger@labn.net>, Vero Zheng <vero.zheng@huawei.com>
Subject: [scale] new updated slides
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Folks,

Lou and I have been editing the slides a bit. Please review and comment.

Next step will be to start working on the problem statement and we will
need help with that. If you are interested please get in contact with
us.

/Loa and Lou
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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From: Pedro Roque Marques <pedro.r.marques@gmail.com>
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Loa,
Looking at the slides, it seems that most of the documents sited are =
aimed at promoting central label allocation. This is hardly a topic that =
i would consider related to scale other than in it decreases the =
flexibility of the solutions.

There seem to be a few attempts to justify central allocations in these =
documents:

a) VLAN emulation
VLANs use global tag to identify the virtual network; the default =
assumption from some technologies trying to emulate vlans is that this a =
positive. I believe this is a very significant misconception: a single =
tag makes it really hard to create topologies that are different from =
the default. For instance to implement a hub and spoke topology, which =
in switching is called "private vlans" requires a switch to use multiple =
internal vlans for the same external tag. Switches actually do map this =
external tag into an internal tag (locally assigned by the switch). They =
just lack the communication mechanism to make label assignment =
hob-by-hop.

There is no reason why VXLAN tags cannot be egress assigned for =
instance. The EVPN control plane can (and is) used to manage VXLAN =
encapsulation and does downstream assignment.

LAN services can be provided when downstream assignment is used. =
Downstream assignment can enable one to, for instance, insert an =
appliance between two end-points without modifying the network =
configuration on the end-points. i.e. by simply manipulating next-hops. =
This has been one of the traditional limitations of LANs.

b) Multicast
Upstream assignment provides the necessary support for being able to =
send a multicast packet to multiple downstreams. It does not require the =
central coordination of global allocation.

c) Identifying the ingress of a multicast packet or a packet sent on a =
mp2p LSP.
This is one issue where there is the need for better solutions.
One practical approach is to use RFC3107. P routers can advertise their =
loopback to a single RR that modifies the route's next-hop; and use the =
received route advertisement from the RR as the label that identifies =
the source. This has a couple of problems that need to be solved: how to =
have multiple RRs for availability / resiliency and how to allow the =
domain to use multiple RRs. These are problems that can be solve... imho =
they should be addressed in the MPLS WG.

As a whole, it seems to me that this issues are unrelated to scale and =
that most of the proposals seem to be leading towards the path of =
removing the main feature of MPLS over other solutions: the flexibility =
provided by the fact that not all nodes in a network must have the same =
view of a LAN or a route.

My opinion is that there is no basis for a independent WG or BOF.
L3VPN control plane scaling can be address in the respective WG;
L2VPN control plane issues likewise;
The MPLS WG can discuss global label allocation; i believe that i'm not =
the only one that will suggest that it is misguided to try to adopt =
global labels and that instead there should be a solution focused on the =
ingress identification. A new mailing list / WG is not the right place =
for this discussion.

  Pedro.
=20
On Dec 1, 2013, at 8:59 AM, Loa Andersson <loa@pi.nu> wrote:

> Folks,
>=20
> Lou and I have been editing the slides a bit. Please review and =
comment.
>=20
> Next step will be to start working on the problem statement and we =
will
> need help with that. If you are interested please get in contact with
> us.
>=20
> /Loa and Lou
> --=20
>=20
>=20
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
> =
<non-wg-forming-bof-pa8.pptx>_____________________________________________=
__
> scale mailing list
> scale@ietf.org
> https://www.ietf.org/mailman/listinfo/scale


From russw@riw.us  Tue Dec  3 09:05:14 2013
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> I've updated slide 2 mentioning number of pairwise associations and the
> management and configuration aspects.

You should also add rate of change, as that can actually be more important
than the number of tunnels, etc. The problem is going to be taking a
bulleted list and building it into a solid problem statement:

> We will need to converge on a problem statement, a tentative starting
point
> would be slide 2. We will need to help to create the problem statement.

Maybe:

Define and address scaling issues and solutions for large VPN deployments,
including the number of end points, number of reachable destinations, number
of multicast trees, length of path, and rate of change in the control plane
state.

The only thing is I don't know if the list needs to be this specific, or if
there should be a general description with specifics defined by the set of
drafts being proposed.

:-)

Russ 


From loa@pi.nu  Thu Dec  5 21:06:58 2013
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Russ,

Do i understand you correctly if I interpret "rate of change" as
the rate by which some type of change has to be done in the mpls
network? I.e. setting up or rearing down a tunnel?

/Loa



On 2013-12-04 01:05, Russ White wrote:
>
>> I've updated slide 2 mentioning number of pairwise associations and the
>> management and configuration aspects.
>
> You should also add rate of change, as that can actually be more important
> than the number of tunnels, etc. The problem is going to be taking a
> bulleted list and building it into a solid problem statement:
>
>> We will need to converge on a problem statement, a tentative starting
> point
>> would be slide 2. We will need to help to create the problem statement.
>
> Maybe:
>
> Define and address scaling issues and solutions for large VPN deployments,
> including the number of end points, number of reachable destinations, number
> of multicast trees, length of path, and rate of change in the control plane
> state.
>
> The only thing is I don't know if the list needs to be this specific, or if
> there should be a general description with specifics defined by the set of
> drafts being proposed.
>
> :-)
>
> Russ
>
> _______________________________________________
> scale mailing list
> scale@ietf.org
> https://www.ietf.org/mailman/listinfo/scale
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

From loa@pi.nu  Thu Dec  5 21:35:10 2013
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Pedro,

I'd like to make one or to things clear when it comes to the listed
slides

- we kind of inherited the draft list, and have chosen to be careful
   removing drafts without being very sure that it does not belong in
   the list
- I've have not read the info around the list of drafts as "this is the
   drafts that will give us the solution of the MPLS VPN Scaling Problem"
   I've seen i more like "these drafts might contain information that is
   relevant when we try to figure out what the critical scaling issues
   are"; i.e. the draft does not have to be "about scaling", but it might
   have "an impact on scaling"!
- having said that I do not claim that this "the list", only that it is
   a zero order approximation; if we find it useful let us refine the
   list, if not let us start to write a problem statement and see if
   some/all/more drafts can be used as references.

The discussin on whether central allocation (in all cases) of labels are
not closed for me. Even if I believe I no the answer I willing to listen
some more.

/Loa

On 2013-12-03 16:11, Pedro Roque Marques wrote:
> Loa,
> Looking at the slides, it seems that most of the documents sited are aimed at promoting central label allocation. This is hardly a topic that i would consider related to scale other than in it decreases the flexibility of the solutions.
>
> There seem to be a few attempts to justify central allocations in these documents:
>
> a) VLAN emulation
> VLANs use global tag to identify the virtual network; the default assumption from some technologies trying to emulate vlans is that this a positive. I believe this is a very significant misconception: a single tag makes it really hard to create topologies that are different from the default. For instance to implement a hub and spoke topology, which in switching is called "private vlans" requires a switch to use multiple internal vlans for the same external tag. Switches actually do map this external tag into an internal tag (locally assigned by the switch). They just lack the communication mechanism to make label assignment hob-by-hop.
>
> There is no reason why VXLAN tags cannot be egress assigned for instance. The EVPN control plane can (and is) used to manage VXLAN encapsulation and does downstream assignment.
>
> LAN services can be provided when downstream assignment is used. Downstream assignment can enable one to, for instance, insert an appliance between two end-points without modifying the network configuration on the end-points. i.e. by simply manipulating next-hops. This has been one of the traditional limitations of LANs.
>
> b) Multicast
> Upstream assignment provides the necessary support for being able to send a multicast packet to multiple downstreams. It does not require the central coordination of global allocation.
>
> c) Identifying the ingress of a multicast packet or a packet sent on a mp2p LSP.
> This is one issue where there is the need for better solutions.
> One practical approach is to use RFC3107. P routers can advertise their loopback to a single RR that modifies the route's next-hop; and use the received route advertisement from the RR as the label that identifies the source. This has a couple of problems that need to be solved: how to have multiple RRs for availability / resiliency and how to allow the domain to use multiple RRs. These are problems that can be solve... imho they should be addressed in the MPLS WG.
>
> As a whole, it seems to me that this issues are unrelated to scale and that most of the proposals seem to be leading towards the path of removing the main feature of MPLS over other solutions: the flexibility provided by the fact that not all nodes in a network must have the same view of a LAN or a route.
>
> My opinion is that there is no basis for a independent WG or BOF.
> L3VPN control plane scaling can be address in the respective WG;
> L2VPN control plane issues likewise;
> The MPLS WG can discuss global label allocation; i believe that i'm not the only one that will suggest that it is misguided to try to adopt global labels and that instead there should be a solution focused on the ingress identification. A new mailing list / WG is not the right place for this discussion.
>
>    Pedro.
>
> On Dec 1, 2013, at 8:59 AM, Loa Andersson <loa@pi.nu> wrote:
>
>> Folks,
>>
>> Lou and I have been editing the slides a bit. Please review and comment.
>>
>> Next step will be to start working on the problem statement and we will
>> need help with that. If you are interested please get in contact with
>> us.
>>
>> /Loa and Lou
>> --
>>
>>
>> Loa Andersson                        email: loa@mail01.huawei.com
>> Senior MPLS Expert                          loa@pi.nu
>> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>> <non-wg-forming-bof-pa8.pptx>_______________________________________________
>> scale mailing list
>> scale@ietf.org
>> https://www.ietf.org/mailman/listinfo/scale
>
> _______________________________________________
> scale mailing list
> scale@ietf.org
> https://www.ietf.org/mailman/listinfo/scale
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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Thomas,

I tried to explain my view of why drafts are listed in a previous
mail, don't know if that works for everyone. If we find we want to
work with the list rather than or in parallel to a problem statement
I would be happy to add and delete drafts as necessary, based on
whether the contain relevant info or not.

On rearranging the list, my response from the reptile brain would be
"please supply text", meaning take the slide and edit it to what you
want it to be.

I've a friend that use to say "If you are talking about a specific
horse called 'Brunte' (yes that is a common name of Swedish horses),
talk about and name him 'Brunte'! Don ot talk about a "quadruped animal
of the Equus genus in the family of Equidae".

Meaning, yes I for be as specific as possible!

/Loa


On 2013-12-02 18:54, thomas.morin@orange.com wrote:
> Hi Loa, Lou,
>
> I'm unsure about many drafts that are (still) listed, and that to me, do
> not address scaling in particular. Among them:
> - draft-ietf-l3vpn-end-system-02
> - draft-xu-l3vpn-virtual-subnet
> - draft-sd-l2vpn-evpn-overlay
> - draft-rabadan-l2vpn-evpn-prefix-advertisement
> If these drafts are really believed to relate to scaling in some
> specific way, then I believe that how they do would deserve to be made
> explicit.
>
> Also factoring-out in one item the set of drafts around the big label
> proposal would increase readability.
>
> Second, in the possible concerns listed on slide 3:
> - scaling wrt. the number of VRFs/VSIs/EVIs on a said PE is probably
> another relevant metric
> - talking about "size of a VPN" sounds vague : maybe talk more
> specifically about "number of sites, CEs, VRFs, prefixes, MACs,
> multicast states -- per VPN" would be better
>
> Thanks,
>
> -Thomas
>
>
> Loa Andersson :
>> Folks,
>>
>> Lou and I have been editing the slides a bit. Please review and comment.
>>
>> Next step will be to start working on the problem statement and we will
>> need help with that. If you are interested please get in contact with
>> us.
>>
>> /Loa and Lou
>>
>>
>> _______________________________________________
>> scale mailing list
>> scale@ietf.org
>> https://www.ietf.org/mailman/listinfo/scale
>
> _________________________________________________________________________________________________________________________
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-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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Loa,
Thank you for the clarification. Please see inline.

On Dec 5, 2013, at 9:34 PM, Loa Andersson <loa@pi.nu> wrote:

> Pedro,
>=20
> I'd like to make one or to things clear when it comes to the listed
> slides
>=20
> - we kind of inherited the draft list, and have chosen to be careful
>  removing drafts without being very sure that it does not belong in
>  the list

I suspect that i'm not the only one that is going to have an intuitive =
negative reaction to frame label allocation policy and architecture =
discussions as "scale". I believe you saw similar comments from others =
in the list.
I'd strongly recommend you to consider removing these. I believe that =
there is room for additional discussion when it comes to label =
allocation techniques. But "scale" wouldn't be typically seen as a =
"backdoor" attempt and get a default negative reaction.

> - I've have not read the info around the list of drafts as "this is =
the
>  drafts that will give us the solution of the MPLS VPN Scaling =
Problem"
>  I've seen i more like "these drafts might contain information that is
>  relevant when we try to figure out what the critical scaling issues
>  are"; i.e. the draft does not have to be "about scaling", but it =
might
>  have "an impact on scaling"!

My input would be to try to figure our whether you see this as an ops =
area effort: deployment best practices, document tradeoffs. Or as a =
protocol development effort. In my view the later already has its =
appropriate forums which have been successfully updating the protocols =
in order to improve issues such as usability and scalability. As an =
example the L3VPN WG has developed a fair amount of work in the area of =
limiting the scope of route advertisements in large scale networks (RFC =
4684 and other efforts).

> - having said that I do not claim that this "the list", only that it =
is
>  a zero order approximation; if we find it useful let us refine the
>  list, if not let us start to write a problem statement and see if
>  some/all/more drafts can be used as references.

=46rom your slides the problem statement is really unclear. In fact it =
is unclear as to whether there is a problem to be solved.

>=20
> The discussin on whether central allocation (in all cases) of labels =
are
> not closed for me.

I believe we should be open minded. Although it would be great to have =
in mind previous iterations of the same discussion and have a bit of =
collective memory. But there are existing forums to have that =
discussion. Unless of course you can make a compelling argument that: a) =
this is a issue sufficiently independent of the MPLS, L3VPN and L2VPN =
protocol developement and b) that the existing forums are not working.

> Even if I believe I no the answer I willing to listen
> some more.
>=20
> /Loa


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Pedro,
<snip>

>
> I suspect that i'm not the only one that is going to have an
   intuitive negative reaction to frame label allocation policy
   and architecture discussions as "scale". I believe you saw
   similar comments from others in the list.

Yes - I think we agree (mostly), but the fact that I recognize
it as an "intuitive negative reaction" makes me wait a bit.

> I'd strongly recommend you to consider removing these. I
   believe that there is room for additional discussion when
   it comes to label allocation techniques. But "scale" wouldn't
   be typically seen as a "backdoor" attempt and get a default
   negative reaction.

hmmmm - I'm not sure about removing, I'd say (if my gut feeling
is right) that we should say that that "different label allocation
policies does not have a (positive) impact on scaling".

/Loa

<snip>
>
> _______________________________________________
> scale mailing list
> scale@ietf.org
> https://www.ietf.org/mailman/listinfo/scale
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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> Do i understand you correctly if I interpret "rate of change" as the rate
by
> which some type of change has to be done in the mpls network? I.e. setting
> up or rearing down a tunnel?

Don't remember if I already answered this or not... I would say that scale
needs to encompass both the speed at which new tunnels are set up and torn
down as well as the rate at which topology changes in the network drive
tunnel modifications. Scale isn't just size of the control plane tables, but
also the rate at which those tables change.

:-)

Russ 


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From: Loa Andersson <loa@pi.nu>
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To: Russ White <russw@riw.us>, scale@ietf.org,  'Lou Berger' <lberger@labn.net>, 'Vero Zheng' <vero.zheng@huawei.com>
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Subject: Re: [scale] Welcome to the MPLS VPN Scaling BoF preparation work
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Russ,

I think we are on the same page :).

On 2013-12-12 02:50, Russ White wrote:
>
>> Do i understand you correctly if I interpret "rate of change" as the rate
> by
>> which some type of change has to be done in the mpls network? I.e. setting
>> up or rearing down a tunnel?
>
> Don't remember if I already answered this or not... I would say that scale
> needs to encompass both the speed at which new tunnels are set up and torn
> down as well as the rate at which topology changes in the network drive
> tunnel modifications. Scale isn't just size of the control plane tables, but
> also the rate at which those tables change.
>
> :-)
>
> Russ
>
> _______________________________________________
> scale mailing list
> scale@ietf.org
> https://www.ietf.org/mailman/listinfo/scale
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

From adrian@olddog.co.uk  Wed Dec 25 13:44:44 2013
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From: "Adrian Farrel" <adrian@olddog.co.uk>
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Date: Wed, 25 Dec 2013 21:42:27 -0000
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Subject: [scale] Scaling VPNs at Christmas
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Hello Scale Mailing List,

I'm a bit puzzled by the lack of activity on this list. If there is genuine
support for the idea of a BoF to discuss scaling VPNs (issues, requirements,
moving towards solutions) I would have expected to see more traffic.  Certainly,
if there is no more evidence of enthusiasm to discuss this then I don't think we
will go ahead with a face-to-face meeting (i.e. a BoF) at the London IETF.

I had expected to hear a chorus of complaints from operators about how they
struggle with their deployments today, and how they want to grow them soon. I
thought I was going to hear from a number of operators about the VPN
requirements of data centers. And I had expected a number of vendors to be
wanting to talk about how they address these problems. My expectation had been
that we would talk about different scaling challenges across the VPN space and
learn what techniques could be common.

But it is OK!
If no-one has scaling concerns or if no-one wants to talk about them right now,
we can move on.

Cheers,
Adrian

