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Re: [Errata Held for Document Update] RFC8200 (5933)

"Zafar Ali (zali)" <zali@cisco.com> Wed, 04 March 2020 05:43 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, "ipv6@ietf.org" <ipv6@ietf.org>
CC: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
Subject: Re: [Errata Held for Document Update] RFC8200 (5933)
Thread-Topic: [Errata Held for Document Update] RFC8200 (5933)
Thread-Index: AQHV8EMCvKat7OdFgk6hFNMM9RFICKg0rYOAgADXhgCAAS7LVYAAtSgAgAAycQA=
Date: Wed, 04 Mar 2020 05:43:53 +0000
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Hi Brian,

Please see in-line.

Thanks

Regards … Zafar

<snip>

IMHO the questions of principle (does it violate the words in RFC8200,
and are those words correct?) are much less important than Robert Raszuk's
question: what harm does this do? And we have the answers to that, I think:

- doesn't harm PMTUD, because making a packet shorter on the last hop can't
possibly harm PMTUD.

- doesn't describe AH rules (which fields are mutable), but AH is not used in
SRH domains.

- may affect OAM mechanisms.

[ZA] As discussed in [https://mailarchive.ietf.org/arch/msg/spring/Y1D6AKAtrSZBBFWbxD1T3OLZYy4/]…
The IPv6 OAM tools will mimic the data packets and send OAM probes encoding the PSP SID in the packet.
The penultimate node does not, cannot and should not differentiate between the data packets and OAM probes and executes the exact same PSP SID.
None of the IPv6 OAM tools has any dependency on the SRH presence.
I took an AI to add clarification in the OAM draft. I will add the text and share the revision.

Thanks

Regards … Zafar

    Brian


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