I’ve been reading about MPLS protection features specifically for RSVP-TE. There are two features that sound very beneficial: path protection (where ingress PE signals a primary and backup LSP) and fast reroute (where transit routers pre-signal bypass LSPs for facility protection). Path protection can be implemented with BFD for sub-second recovery, so seems a really viable option. Fast reroute is great but can lead to suboptimal pathing for the duration of the repair. Is it common to implement both of these, or just one or the other usually? What are the pros and cons to these two methods?
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