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Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01

Robert Raszuk <robert@raszuk.net> Fri, 11 December 2020 09:16 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 11 Dec 2020 10:15:57 +0100
Message-ID: <CAOj+MMEiO=-Ac=CK1=nk1CqJPTzdVTb16RGKSzOpGLRpvs12og@mail.gmail.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>
Cc: Peter Psenak <ppsenak@cisco.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, lsr <lsr@ietf.org>
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Subject: Re: [Lsr] WG Adoption Call for "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks" - draft-bonica-lsr-ip-flexalgo-01
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Hi Jie,


> But if node A sends SRv6 packets with node C's SRv6 SID in FA 128 as the
> destination address, when the packet arrives at E, it will be dropped,
> because node E does not have the forwarding entry for C's SRv6 SID in FA
> 128.


* How can E be on the SRv6 SID list if it did not advertise SRv6
participation in the first place ?

* What do you mean by "SRv6 SID in FA 128" ? Aren't SIDs global and not per
FA ?

Btw this is good discussion but how is this related to IP Flex Algo
topic/draft ?

Last - I do share your concern on how topology computation can be data
plane independent. Yes it works for IP Flex Algo when IPv4 and IPv6 are
topologically congruent, but when you add running SR on subset of nodes to
the mix it is no longer the case.

Thx,
R.

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