Hi Authors The Section 2, doesn't provide any clarification on the 'Instance' part of the Link ID of OSPFv2 Extended Prefix Opaque LSA.
There can be two possible implementations 1) When a Segment routing enabled router is advertising multiple Ext Prefix TLV, it can keep repacking it into a single Ext Prefix LSA, as has been mentioned in end of section 2 and keep increasing the instance . The lowest instance is taken. Higher instance from same router for same prefix is ignored. 2) Another possible way is, not to go for this repacking. Instead it should be possible to originate separate Ext Prefix LSAs for every Ext Prefix TLV, and only one TLV per LSA. The instance number or Opaque id can be derived from the prefix/interface so as to ensure its unique for every prefix originating from the same advertising router. The draft is not clear on whether (2) can be allowed. It hasn't mentioned that the instance is topology independent and dependent on how we choose to implement it. The TE RFC however has a section devoted to this https://tools.ietf.org/html/rfc3630#section-2.2 Please give your thoughts on this. Regards Santanu
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