[mpls] Control plane solutions for the use cases of NFFRR

[Ketan Talaulikar <[e-mail]>]

Hello Kireeti/Wen,

I wanted to check if you had considered a control plane-based solution for
some of the use cases that motivated the NFFRR work.

I would like to draw your attention to a draft that tries to address a
similar problem space for EVPN:
https://datatracker.ietf.org/doc/draft-burdet-bess-evpn-fast-reroute/

For Segment Routing, we have the unprotected adjacency SIDs and there have
been discussions in the SPRING WG for unprotected prefix SIDs. The use of
these SIDs for the TI-LFA backup path can also address the issue.

There may perhaps be similar control plane mechanisms that may work for
other similar problem spaces?

IMHO, tackling this problem space in the control plane alone seems more
beneficial than in the data plane (I note that the NFFRR proposal also
needs control plane extensions). Could you please share your views on this?

Thanks,
Ketan