
From ben@niven-jenkins.co.uk  Tue Apr 12 14:17:30 2011
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From: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
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Cc: rtg-dir@ietf.org, draft-palanivelan-bfd-v2-gr.all@tools.ietf.org
Subject: [RTG-DIR] RtgDir review: draft-palanivelan-bfd-v2-gr-10.txt
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Hello,
I have been selected as the Routing Directorate reviewer for this draft. =
The Routing Directorate seeks to review all routing or routing-related =
drafts as they pass through IETF last call and IESG review. The purpose =
of the review is to provide assistance to the Routing ADs. For more =
information about the Routing Directorate, please see =
http://www.ietf.org/iesg/directorate/routing.html

As this is an Independent submission via the ISE these comments are =
primarily for the use of the Routing ADs.

Document: draft-palanivelan-bfd-v2-gr-10.txt
Reviewer: Ben Niven-Jenkins
Review Date: 12 April 2011
IETF LC End Date: N/A
Intended Status: Historic

Summary: I have significant concerns about this document and recommend =
that the Routing ADs discuss these issues further with the authors.

Comments: In places the text of the document is extremely hard to parse =
and I had to read some sections multiple times to try to understand what =
was written.

Major Issues:
Although I note that this is a Independent submission with an Intended =
Status of Historic that documents a proposal that was rejected by the =
BFD WG and that RFC5742 section 5 states "In general, the IESG has no =
problem with rejected alternatives being made available to the =
community;" in my opinion the document extends an IETF protocol in a way =
that requires further review by the Routing ADs and/or the BFD WG before =
being considered for publication, because:

1) The document introduces two new sections/fields into the Generic BFD =
Control Packet format specified in RFC5880 section 4.1 without any =
discussion or details of:

A) Whether such a change would constitute or require a new version of =
the BFD protocol, or

B) Whether such a change is backwards compatible and/or interoperable =
with existing BFD protocol version and implementations.=20

2) The document introduces a new BFD state machine that differs from the =
existing state machine specified in RFC5880 in three ways:

A) It expects implementations to transition between states based on the =
value of the received Diag field whereas the existing BFD state machine =
does not rely on the value of the Diag field to initiate state changes. =
[Section 6.2 Paragraph 9]

B) It removes the ability to transition out of the DOWN state. As =
RFC5880 specifies that newly created BFD sessions start in the DOWN =
state it would appear that the new state machine proposed in the =
document removes the ability for a BFD session between neighbours to =
bootstrap itself. [State diagram in Section 5]

C) It introduces a new state "NEIGHBORRESTART" which appears (to me) to =
be backwards compatible but given (A) and (B) above it would seem =
prudent to be cautious and request a review from the BFD WG in order to =
be certain. [State diagram in Section 5]

3) The document states in the abstract:

   This document is a historical record of some work and discussions in
   the bfd working group on a possible solution to the Graceful Restart
   issues with BFD.  To keep the protocol simple, it was decided not to
   include this extension in the BFD standard.

However from perusing the BFD mailing list archive it would appear IMO =
that the above is not an accurate characterisation of the discussion =
which appears to me have been reasonably hostile towards the proposal =
with more than one participant expressing the view that the proposed =
solution does not in fact solve the problem that it purports to.=20

As the document is claiming to record the outcome of discussions in the =
BFD WG it would seem appropriate for the BFD WG to formally review the =
document to ensure that the document is an accurate record of those =
discussions.

Minor Issues:=20
1) The document states that it addresses Graceful Restart issues with =
BFD but its description of those issues in Section 2 paragraph 2 is not =
particularly well explained and the text is extremely hard to parse.


Ben


From takeda.tomonori@lab.ntt.co.jp  Thu Apr 21 22:22:52 2011
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Date: Fri, 22 Apr 2011 14:21:37 +0900
From: Tomonori TAKEDA <takeda.tomonori@lab.ntt.co.jp>
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Cc: rtg-dir@ietf.org, draft-ietf-idr-bgp-identifier@tools.ietf.org
Subject: [RTG-DIR] RtgDir review: draft-ietf-idr-bgp-identifier-13.txt
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Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review. The purpose
of the review is to provide assistance to the Routing ADs. For more
information about the Routing Directorate, please see
http://www.ietf.org/iesg/directorate/routing.html

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF
Last Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-idr-bgp-identifier-13.txt
Reviewer: Tomonori Takeda
Review Date: 22 April 2011
IETF LC End Date: 18 April 2011
Intended Status: Standards Track

Summary:
I have some minor concerns about this document that I think should be
resolved before publication.

Comments:
This document is short, clearly written and easy to understand. I have
one minor comment that should be clarified.

o Major Issues:
No major issues found.

o Minor Issues:
Section 3:

It says,

   In addition to the OPEN message, the BGP Identifier is currently also
   used in the following areas:
   ...
     o In the Route Reflection (in lieu of the Cluster-id) within an
       AS, where only the BGP Identifier of an internal neighbor may
       be propagated in the route reflection related attributes.

I am a bit confused about "in lieu of the Cluster-id". My reading of
this text is that the BGP Identifier is used in CLUSTER_ID attribute in
the Route Reflection, which is not usually correct.

I guess text should be (by removing "in lieu of the Cluster-id") :

   In addition to the OPEN message, the BGP Identifier is currently also
   used in the following areas:
   ...
     o In the Route Reflection within an AS, where only the BGP
       Identifier of an internal neighbor may be propagated in the route
       reflection related attributes.

or something like this.

o Nits:
None.


Thanks,
Tomonori


From adrian@olddog.co.uk  Wed Apr 27 15:15:41 2011
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <rtg-dir@ietf.org>
Date: Wed, 27 Apr 2011 23:15:33 +0100
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Subject: [RTG-DIR] Looking for a VRRP reviewer
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Anyone familiar with VRRP or willing to bootstrap?

Hint: the review is of a MIB module :-(

Thanks,
Adrian


From acee.lindem@ericsson.com  Wed Apr 27 15:26:42 2011
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I've implemented VRRPv2 more than once I guess I can review the VRRPv3 =
MIB. What is the due date?=20

Acee=20
On Apr 27, 2011, at 6:15 PM, Adrian Farrel wrote:

> Anyone familiar with VRRP or willing to bootstrap?
>=20
> Hint: the review is of a MIB module :-(
>=20
> Thanks,
> Adrian
>=20


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From jmh@joelhalpern.com  Wed Apr 27 15:27:15 2011
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Well, once upon a time I was very familiar with it.
I'll take it.
Joel

On 4/27/2011 6:15 PM, Adrian Farrel wrote:
> Anyone familiar with VRRP or willing to bootstrap?
>
> Hint: the review is of a MIB module :-(
>
> Thanks,
> Adrian
>
>

From adrian@olddog.co.uk  Wed Apr 27 15:35:13 2011
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yea gods, they are fighting to do a review!

I'll hand this over to Deborah and she can decide who wants to do it most :-)

A

> -----Original Message-----
> From: Joel M. Halpern [mailto:jmh@joelhalpern.com]
> Sent: 27 April 2011 23:27
> To: adrian@olddog.co.uk
> Cc: rtg-dir@ietf.org
> Subject: Re: [RTG-DIR] Looking for a VRRP reviewer
> 
> Well, once upon a time I was very familiar with it.
> I'll take it.
> Joel
> 
> On 4/27/2011 6:15 PM, Adrian Farrel wrote:
> > Anyone familiar with VRRP or willing to bootstrap?
> >
> > Hint: the review is of a MIB module :-(
> >
> > Thanks,
> > Adrian
> >
> >


From stig@venaas.com  Wed Apr 27 21:10:12 2011
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Subject: [RTG-DIR] RtgDir review: draft-ietf-grow-unique-origin-as-00
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Hi,

I have been selected as the Routing Directorate reviewer for this draft. 
The Routing Directorate seeks to review all routing or routing-related 
drafts as they pass through IETF last call and IESG review. The purpose 
of the review is to provide assistance to the Routing ADs. For more 
information about the Routing Directorate, please see 
http://www.ietf.org/iesg/directorate/routing.html

Although these comments are primarily for the use of the Routing ADs, it 
would be helpful if you could consider them along with any other IETF 
Last Call comments that you receive, and strive to resolve them through 
discussion or by updating the draft.

Document: draft-ietf-grow-unique-origin-as-00
Reviewer: Stig Venaas
Review Date: April 27, 2011
IETF LC End Date: Unknown
Intended Status: Best Current Practice

Summary:

The document is well written, and I only have two very minor issues.

Minor issues:

1: Regarding traceroute it says:

    enables service-level identification of a given server.  Tools such
    as traceroute are also used to determine which location a given query
    is being routed to, although it may not reveal local-scope anycast
    instances, or if there are multiple servers within a given anycast
    node, which of the servers responded to a given query, in particular
    when multiple servers within an anycast node are connected to a
    single IP router.  When utilizing these service level capabilities,

Why is local-scope emphasized here? I would think that traceroute
always gives you one node. It may be a particular global node, or a
local node, depending on your location. It may not reveal local-scope,
but it may not reveal global-scope either. They key thing is that you
get only one. And you may not know what the scope is either. Am I
missing something, or should the text be changed?

2: Regarding synchronization of instances it says:

    Additionally, while it goes without saying that anycasted services
    should always strive for exact synchronization across all instances
    of an anycasted service address, if local policies or data plane
    response manipulation techniques were to "influence" responses within
    a given region in such a way that those response are no longer
    authentic or that they diverge from what other nodes within an
    anycasted service were providing, then it should be an absolute
    necessity that those modified resources only be utilized by service
    consumers within that region or influencer's jurisdiction.

Isn't this a bit DNS centric? I can think of anycast services where
different nodes intentionally have different content. I'm not sure
if it necessarily is important to restrict it to region or jurisdiction
either. It all depends on the service.

Maybe rephrase this to point out that this may be an important issue,
depending on the service?

Nit:

In the paragraph above I found this line:

    a given region in such a way that those response are no longer
                                            ^^^^^^^^
s/response/responses

That's all I have,

Stig




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Much thanks Acee and Joel - as Acee was "I guess I can" and Joel was
"I'll take it", we'll assign to Joel:-)


-----Original Message-----
From: rtg-dir-bounces@ietf.org [mailto:rtg-dir-bounces@ietf.org] On
Behalf Of Joel M. Halpern
Sent: Wednesday, April 27, 2011 6:27 PM
To: adrian@olddog.co.uk
Cc: rtg-dir@ietf.org
Subject: Re: [RTG-DIR] Looking for a VRRP reviewer

Well, once upon a time I was very familiar with it.
I'll take it.
Joel

On 4/27/2011 6:15 PM, Adrian Farrel wrote:
> Anyone familiar with VRRP or willing to bootstrap?
>
> Hint: the review is of a MIB module :-(
>
> Thanks,
> Adrian
>
>

From jmh@joelhalpern.com  Thu Apr 28 08:37:24 2011
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Date: Thu, 28 Apr 2011 11:37:22 -0400
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Subject: [RTG-DIR] RtgDir review: draft-ietf-vrrp-unified-mib-09.txt
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Hello,

I have been selected as the Routing Directorate reviewer for this draft. 
The Routing Directorate seeks to review all routing or routing-related 
drafts as they pass through IETF last call and IESG review, and 
sometimes on special request. The purpose of the review is to provide 
assistance to the Routing ADs. For more information about the Routing 
Directorate, please see http://www.ietf.org/iesg/directorate/routing.html

Although these comments are primarily for the use of the Routing ADs, it 
would be helpful if you could consider them along with any other IETF 
Last Call comments that you receive, and strive to resolve them through 
discussion or by updating the draft.


Document: draft-ietf-vrrp-unified-mib-09.txt
Reviewer: Joel Halpern
Review Date: 28-April-2011
IETF LC End Date: 2011-05-11
Intended Status: Proposed Standard

Summary: I have significant concerns about this document and recommend 
that the Routing ADs discuss these issues further with the authors.

Note: The document is very readable, and quite clear on its 
architecture.  I appreciate that.

Major issue:
There seems to be an architectural disconnect between this MIB and RFC 
5798.  WHile I can understand the design in the MIB, and would not have 
any concern if that were the design in 5798, they appear not to match.

Specifically, Section 6.1 of RFC 5798 says that a given Virtual Router 
has a Virtual Router ID (VRID) and a priority.  That virtual router then 
has a list of Ipv4 addresses it is associated and a list of IPv6 
addresses addresses it is associated with.  There is a single priority 
for the entire virtual router.  (As documented, conceptually, all VRs 
serve all address types, even if some of them may be configured with 
only IPv4 addresses or only IPv6 addresses.)

In contrast, the MIB document goes to great trouble to diagram the 
virtual router as being dedicated to a single address family.   In the 
MIB, conceptually, they are two routers for a given VRID.  This is shown 
in the diagrams by having two different priorities for these two 
different routers, and different states (master vs backup) for the two 
virtual routers in the same box, even though they are using the same 
VRID.  This is reflected in the base keying structure of the MIB.

For all I know, this is the actual practice in deploying the protocol. 
But it is NOT what the RFC says.  (And no, this can not be fixed as an 
errata to RFC 5798.)


Minor issues:
(These assume the structure as given in the MIB.  If I am correct about 
the major issue needing to be addressesd, many of these will become OBE.)
In the example in section 8, in the vrrpv3AssociatedIpAddrTable  for 
VR1, it shows address Z as being active on rotuer VR1.  However, the 
diagram shows address Z as only active on VR2. (And the table for  VR2 
shows Z as active there.)  I presume this is a cut-and-paste error, and 
the line for Z in VR1 just needs to be removed.

I presume that there is a good reason why vrrpv3RouterChecksumErrors, 
vrrpv3RouterVersionErrors, vrrpv3RouterVrIdErrors, and 
vrrpv3GlobalStatisticsDiscontinuityTime do not exist per interface?  (I 
can understand why they are not per VRID, since with these errors, one 
could not associate them with a specific VRID.  But they can be 
associated with a specific Interface.)
Also, whether they remain associated with the physical router, or become 
a per-interface table, it would seem that they should be described in 
section 7 on the structure of the MIB.  This description should also 
explain the scoping.


Nit:
Should the description of vrrpv3OperationsAcceptMode include a
REFERENCE " RFC 5798 section 6.1"
It seems odd to have one table Augment another in the same MIB document. 
  Is this just for human readability?


Yours,
Joel M. Halpern

line?
