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Re: [spring] Chair Review of draft-ietf-spring-srv6-srh-compression-11

Tom Herbert <tom@herbertland.com> Mon, 25 March 2024 17:06 UTC

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From: Tom Herbert <tom@herbertland.com>
Date: Mon, 25 Mar 2024 10:06:26 -0700
Message-ID: <CALx6S362MGbtEyRjHDUKvVYkD01hYGD+Qj37GdFHODRsahLpJA@mail.gmail.com>
To: Robert Raszuk <robert@raszuk.net>
Cc: Andrew Alston - IETF <andrew-ietf@liquid.tech>, Ron Bonica <rbonica@juniper.net>, "spring@ietf.org" <spring@ietf.org>
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Subject: Re: [spring] Chair Review of draft-ietf-spring-srv6-srh-compression-11
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On Mon, Mar 25, 2024 at 10:04 AM Robert Raszuk <robert@raszuk.net> wrote:
>
> Hi Tom,
>
> I don't think so, but I admit I may not be aware of some interesting use cases ....

Robert,

Based on previous discussions, my understanding is that there was some
intent to allow this. Maybe it should be a clear MUST NOT in the draft
to resolve the issue.

Tom

>
> Many thx,
> R.
>
>
> On Mon, Mar 25, 2024 at 5:57 PM Tom Herbert <tom@herbertland.com> wrote:
>>
>> On Mon, Mar 25, 2024 at 9:40 AM Robert Raszuk <robert@raszuk.net> wrote:
>> >
>> >
>> > Actually looking at this from the perspective where SRH may be omitted I see in the subject draft this clearly stated:
>> >
>> > A source node steers a packet into an SR Policy. If the SR Policy results in a Segment List containing a single segment, and there is no need to add information to the SRH flag or add TLV; the DA is set to the single Segment List entry, and the SRH MAY be omitted.¶
>> >
>> >
>> > That to me indicated that host computed checksum will be correct all along the transit nodes. So no issue either here.
>> >
>> > Could someone illustrate with a drawing of packet's traversing the network their assumed header format and forseen issues ?
>>
>> Robert,
>>
>> Are there any cases in segment routing where the Destination Address
>> is changed in flight and a routing header is not present in the
>> packet?
>>
>> Tom
>>
>> >
>> > Thx,
>> > R,
>> >

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