Hi, Should we clarify how to set E-flag for ABR/ASBR in OSPF SR extension?
In https://www.ietf.org/id/draft-ietf-ospf-segment-routing-extensions-14.txt, the draft describes how to set NP-flag on ABR and ASBR (Section 5 [Page 14]): The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to inter- area prefixes that are originated by the ABR based on intra-area or inter-area reachability between areas. When the inter-area prefix is generated based on a prefix which is directly attached to the ABR, the NP-Flag SHOULD NOT be set. The NP-Flag (No-PHP) MUST be be set for Prefix-SIDs allocated to redistributed prefixes, unless the redistributed prefix is directly attached to the ASBR, in which case the NP-flag SHOULD NOT be set. However, the E-flag (Explicit-Null Flag) is not described. Should we clarify it also? I think E-flag SHOULD NOT be set if the prefix is not directly attached to the ABR or ASBR, and if necessary, it SHOULD be set if the prefix is directly attached to the ABR or ASBR. Regards, Chao Fu
_______________________________________________ spring mailing list [email protected] https://www.ietf.org/mailman/listinfo/spring
