Hi Peng, The choice to advertise REPLACE or REPLACEB6 is not based on the sid-list on which it is resolving. We will update the draft with details and examples for all the SIDs to clarify. You can review the updated draft and we can discuss if you have further questions.
Rgds Shraddha Juniper Business Use Only From: Darren Dukes (ddukes) <ddu...@cisco.com> Sent: Tuesday, November 9, 2021 7:33 PM To: peng.sha...@zte.com.cn; draft-salih-spring-srv6-inter-domain-s...@ietf.org Cc: spring@ietf.org Subject: Re: [spring] Questions about REPLACEB6 of draft-salih-spring-srv6-inter-domain-sids [External Email. Be cautious of content] Hi Peng, your question is part of why I asked for some descriptions of how an SR Source chooses a SID of one of these behaviors vs another. I think we'll know more once we see that. Darren On 2021-11-08, 10:32 PM, "spring" <spring-boun...@ietf.org<mailto:spring-boun...@ietf.org>> wrote: Hi authors, Thanks for bringing SRv6 SID swaping idea in the distributed scenario. I think there is valid case when the target prefix originated from remote domain is invisible or unreachable to the intermediate nodes of the local domain, and the intermediate nodes of the local domain have routes to the REPLACE SID allocated by the border node of the local domain. However, the question as I raised at the meeting, REPLACEB6 may be not necessary, because it is the local behavior of the BGP speaker to swap a single SID or a segment list. It may be not appropriate to advertise prefix with REPLACE behavior to the upstream neighbor at time-1, and re-advertise the same prefix with REPLACEB6 behavior at time-2 just because its forwarding information is changed from a single outgoing SID to a SID list. Otherwise, it will cause excessive advertisement overhead in the network. Just like MPLS BGP-LU, the difference of a single outgoing label or an outgoing label stack at the local node is not aware by upstream node. There may be some reasons for re-advertisement, such as the need to announce a new metric, but these reasons do not support the need for REPLACEB6. Regards, PSF _______________________________________________ spring mailing list spring@ietf.org<mailto:spring@ietf.org> https://www.ietf.org/mailman/listinfo/spring<https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spring__;!!NEt6yMaO-gk!RTuE-88ssR6PqB6sfatneS_z4DlWiTA6nTJXZ6jj_SpsCg2PqH9UnZRQNVqqghPa$>
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