Protecting Multihop BFD during RLFA/TI-LFA Local Repair
I've a question on Multihop BFD protection on XR platforms.
Multihop BFD (RFC 5883) packets are sent over UDP/IP. The encapsulation used is identical to single hop BFD (RFC 5881) except that the UDP destination port is set to 4784.
Now, suppose on the ingress node there is no IP/LFA backup path for the destination address tracked by multihop BFD, but there exists an RLFA or TI-LFA (1-segment or 2-segment) backup path to that destination. In this case, does IPOS XR platforms support protecting multihop BFD packets over the RLFA or TI-LFA (1-segment or 2-segment) backup paths i.e do they keep the multihop BFD session up if the outgoing link or nexthop neighbor for the primary path goes down?
On asr9k multi-hop BFD sessions are hosted on any line card. The async packets are generated and received by the LC CPU (we don't support echo on MH BFD sessions). It doesn't matter on which NP/interface are packets received. As long as valid path exists to the MH BFD peer, the BFD session will be up. The MH BFD session will flap only if the line card that hosts the MH BD session is reloaded. In that case another LC has to take ownership of that session and initialise it.
Thanks for the inputs. A follow up question for me to understand better:
Suppose there is a primary IP path and an LSP path to the remote PE loopback (i.e BGP nexthop tracked using MH-BFD). In this case, are the MH-BFD packets generated by the LC CPU on ASR9K sent over the IP path or LSP path?
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