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From: Tim Chown via Datatracker <noreply@ietf.org>
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Cc: draft-ietf-bess-rfc5549revision.all@ietf.org, bess@ietf.org, last-call@ietf.org
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Date: Tue, 01 Sep 2020 04:35:29 -0700
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Subject: [Int-dir] Intdir telechat review of draft-ietf-bess-rfc5549revision-06
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Reviewer: Tim Chown
Review result: Ready

Hi,

This is a INT-DIR review of draft-ietf-bess-rfc5549revision-06.

I am not very familiar with RFC5549, and not a subject matter expert, so found
myself referring back to that document quite a lot, trying to get a clear view
of the -bis differences.  I found the addition of a new Section 2 in the -05
version with the key changes listed very helpful.

I believe the document to be Ready for publication.

Tim



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To: Tim Chown <tim.chown@jisc.ac.uk>, "int-dir@ietf.org" <int-dir@ietf.org>
Thread-Topic: [Int-dir] Intdir telechat review of draft-ietf-bess-rfc5549revision-06
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Subject: Re: [Int-dir] Intdir last call review of draft-ietf-bess-evpn-na-flags-05
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To: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
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Subject: Re: [Int-dir] Intdir telechat review of draft-ietf-bess-rfc5549revision-06
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To: Tim Chown <Tim.Chown@jisc.ac.uk>
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Subject: Re: [Int-dir] Intdir telechat review of draft-ietf-bess-rfc5549revision-06
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To: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
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Subject: Re: [Int-dir] Intdir telechat review of draft-ietf-bess-rfc5549revision-06
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From: Brian Haberman via Datatracker <noreply@ietf.org>
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Cc: last-call@ietf.org, draft-ietf-spring-srv6-network-programming.all@ietf.org, spring@ietf.org
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Date: Mon, 14 Sep 2020 11:50:48 -0700
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Subject: [Int-dir] Intdir telechat review of draft-ietf-spring-srv6-network-programming-18
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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?




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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Brian Haberman <brian@innovationslab.net>, "int-dir@ietf.org" <int-dir@ietf.org>
CC: "last-call@ietf.org" <last-call@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "draft-ietf-spring-srv6-network-programming.all@ietf.org" <draft-ietf-spring-srv6-network-programming.all@ietf.org>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Brian Haberman <brian@innovationslab.net>, "int-dir@ietf.org" <int-dir@ietf.org>
CC: "last-call@ietf.org" <last-call@ietf.org>, "draft-ietf-spring-srv6-network-programming.all@ietf.org" <draft-ietf-spring-srv6-network-programming.all@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Intdir telechat review of draft-ietf-spring-srv6-network-programming-18
Thread-Index: AQHWisgOABNJ9LVpt0G+kbGwur3cl6ls40Tw
Date: Thu, 17 Sep 2020 16:29:12 +0000
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References: <160010944848.21991.11984187873336962718@ietfa.amsl.com>
In-Reply-To: <160010944848.21991.11984187873336962718@ietfa.amsl.com>
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