Re: [Tsv-art] [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05

Nick Hilliard <nick@foobar.org> Mon, 22 February 2021 18:25 UTC

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To: Tom Herbert <tom@herbertland.com>
Cc: Fernando Gont <fgont@si6networks.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, tsv-art@ietf.org, last-call@ietf.org, draft-ietf-v6ops-ipv6-ehs-packet-drops.all@ietf.org, IPv6 Operations <v6ops@ietf.org>
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From: Nick Hilliard <nick@foobar.org>
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Date: Mon, 22 Feb 2021 18:25:34 +0000
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Subject: Re: [Tsv-art] [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05
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Tom,

Tom Herbert wrote on 22/02/2021 16:29:
> then the obvious question is what exactly is too long. Since this
> draft is discussing real implementation and not theory, it seems like
> measuring the extent and determining the real operational parameters
> of the problems, like what a useful minimum length of header chains
> is, seems straightforward either by experimentation or simply polling
> router vendors to see what they support.

This issue has already been addressed by Rob Wilton in his AD review:

https://mailarchive.ietf.org/arch/msg/v6ops/iqtpqSIRolTWMbMVIpm-gcoo8qM/

The review is valid.  Behaviour of this form is dependent on just about 
everything from the router model, to the line card model, to the ASIC / 
NPU deployed, to the firmware or software version running on the 
forwarding device.  A general description is adequate for the purposes 
of this draft.

Nick