I read it as Local discriminator assigned for a BDS session is optional in echo reply that is being sent in response to LSP ping echo. I don't think RFC 5884 is not talking about echo reply being optional.
Thanks Santosh P K On Sun, Jul 16, 2017 at 7:28 PM, Mach Chen <[email protected]> wrote: > Hi BFDers, > > We met a multi-vendor interoperate issue recently, it's about whether an > Echo reply is necessary. > > In Section 6 of RFC5884, 2nd paragraph > > "... The egress LSR MAY respond with an LSP Ping Echo > reply message that carries the local discriminator assigned by it for > the BFD session." > > >From the above text, my understanding is that an Echo reply is optional, > the egress LSR can freely to return or not return an Echo reply, and the > Ingress LSR should not expect there MUST be an Echo reply, but if there is > one, it should handle it properly. > > Is my understanding correct? > > Thanks, > Mach > >
