Re: [spring] NEXT-ONLY-CSID in draft-filsfils-spring-net-pgm-extension-srv6-usid-12

(speaking as a WG member trying to understand this exchange.)

Having two codes, one for NEXT-ONLY-CSID and one for NEXT-CSID seems odd.
In terms of what the node does with packets addressed to SIDs with the 
given behavior, they seem to be the same.
So if I understand properly, the different is an implication about the 
existence of SIDs for this node with other behaviors?  But wouldn't 
receivers determine such behavior being available from the 
advertisements of those behaviors?  If there are no other advertised 
(compressed?) behaviors, wouldn't that tell you everything you need to 
know.  If there are such other advertiements, but 42 (NEXT-ONLY-CSID) is 
advertised what would that mean?  And conversely, if there are no other 
advertised relevant behaviors, what would it mean to advertise 43 
(NEXT-CSID)?

Yours,
Joel

On 4/7/2022 9:52 AM, Pablo Camarillo (pcamaril) wrote:
> Hi Trevor,
> 
> This refers to a node that only processes the ::/64 (shift-and-lookup) 
> of 4.1.1.
> 
> Cheers,
> 
> Pablo.
> 
> *From:*spring <spring-bounces@ietf.org> *On Behalf Of *Trevor Mendez
> *Sent:* viernes, 25 de marzo de 2022 19:20
> *To:* spring@ietf.org
> *Subject:* [spring] NEXT-ONLY-CSID in 
> draft-filsfils-spring-net-pgm-extension-srv6-usid-12
> 
> Hi all,
> 
> What is the meaning of NEXT-ONLY-CSID?  It isn't clear to me what the 
> difference is between 42 and 43 below?
> 
>     +=======+========+======================================+===========+
> 
>     | Value |  Hex   |          Endpoint behavior           | Reference |
> 
>     +=======+========+======================================+===========+
> 
>     | 42    | 0x002A |       End with NEXT-ONLY-CSID        | [This.ID] |
> 
>     +-------+--------+--------------------------------------+-----------+
> 
>     | 43    | 0x002B |          End with NEXT-CSID          | [This.ID] |
> 
>     +-------+--------+--------------------------------------+-----------+
> 
> (Looks like a similar question was asked before here 
> <https://mailarchive.ietf.org/arch/msg/spring/CAhP45_cgEQ2_1cWLFBdm8llJYA/>, 
> but I didn't see an answer.)
> 
> 
> Thanks,
> Trevor
> 
> 
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