Gyan –
While I don’t speak for Ketan, in regards to:
Also maybe mention of OSPF multi instance RFC 6549 and any caveats related to
support of reverse metric.
KT> I am not sure how OSPF multi-instance has any bearing on this
specification. Please let me know if I am missing something.
Gyan> RFC 8500 had section 3.2 Multi-topology ISIS support on P2P links so
was wondering if multi instance with ospf may have any special considerations
just in case to check.
[LES:] You are confusing two different functionalities.
IS-IS Multi-Topology (RFC 5120) defines how a single instance of the protocol
supports multiple topologies.
There is one adjacency which supports as many topologies as are shared between
the two neighbors.
Topology specific advertisements for neighbors (TLV 222) are sent by the single
instance.
The language in RFC 8500 indicates that the reverse metric sent in hellos
applies equally to all topology specific advertisements.
RFC 6549 is quite different. It defines how to support multiple
instances on a single interface – each with an instance specific adjacency.
The comparable functionality in IS-IS would be RFC 8202.
I agree w Ketan that there is no reason to discuss multi-instance here as
(unlike MT) instance specific hellos are used.
HTH.
Les
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