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Re: [spring] SRH scratch space (was Re: Question about SRv6 Insert function)

Robert Raszuk <robert@raszuk.net> Tue, 10 December 2019 21:08 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 10 Dec 2019 22:08:16 +0100
Message-ID: <CAOj+MMGTkXETWP5EcYWsRkgCQ8y81EsH+rGwzfDTBYrJVxng3g@mail.gmail.com>
Subject: Re: [spring] SRH scratch space (was Re: Question about SRv6 Insert function)
To: Mark Smith <markzzzsmith@gmail.com>
Cc: Erik Kline <ek.ietf@gmail.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, Suresh Krishnan <suresh.krishnan@gmail.com>, draft-voyer-6man-extension-header-insertion <draft-voyer-6man-extension-header-insertion@ietf.org>, Fernando Gont <fernando@gont.com.ar>, Brian E Carpenter <brian.e.carpenter@gmail.com>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
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Well I take it as a joke ... as I am sure you are aware that SRH already
contains those verbatim.

PS.

Note that SRm6 would require a local mapping database to decipher those in
CRH.

On Tue, Dec 10, 2019 at 10:02 PM Mark Smith <markzzzsmith@gmail.com> wrote:

> Perhaps we need to update RFC8200 and eliminate the source address field,
> or at least update it so that it can hold a multicast address, indicating
> the packet has multiple source devices.
>
> On Wed, 11 Dec 2019, 07:54 Erik Kline, <ek.ietf@gmail.com> wrote:
>
>> Ah right.
>>
>> Still, in terms of the things that could be relaxed in 8200, allowing the
>> SRH to be treated more like a Hop-by-Hop header might be more palatable
>> than things that change the effective MTU.
>>
>> On Tue, Dec 10, 2019 at 12:42 PM Robert Raszuk <robert@raszuk.net> wrote:
>>
>>>
>>> The issue is that RFC8200 forbids even modification to any EH unless the
>>> node is a destination node in top most IPv6 header.
>>>
>>>
>>> If there were no resolution to the insertion question vis a vis RFC
>>>> 8200, then would it then suffice to recommend that ingress nodes should
>>>> include some padding for these non-SR midpoints to play with (iff. the
>>>> network has such midpoints), and otherwise abide by RFC 8200?
>>>>
>>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
>>
>

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