[Lsr] draft-draft-peng-lsr-algorithm-related-adjacency-sid

chen.ran@zte.com.cn Thu, 11 March 2021 08:52 UTC

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Subject: [Lsr] draft-draft-peng-lsr-algorithm-related-adjacency-sid
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Hi Tony, 

   Thanks for your comments. The reason why this draft is proposed is that:

   Currently, the current FA draft only defines that the algorithm identifier is included as part of a  Prefix-SID advertisement,that maybe not satisfy some scenarios where multiple algorithm share the same link resource.  

    For example, an SR-TE policy may be instantiated within specific Flex-algo plane, i.e.,the SID list requires to include algorithm related SIDs.  An algorithm-unware Adjacency-SID included in the SID list can just steer the packet towards the link, but can not apply different QoS policy for different algorithm.         

     Another example is that the TI-LFA backup path computed in Flex-algo plane may also contain an algorithm-unware Adjacency-SID, which maybe also used in other SR-TE instance that carries other service.

    This document complement that the algorithm identifier can be also  included as part of an Adjacency-SID advertisement for SR-MPLS.

Best Regards,