I'm struggling to understand and choose what design is better. So there is an ISIS FRR enabled in the core and it's same switchover speed as MPLS FRR (~25-30ms). But LFA doens't cover everything due to topology. So we using TE tunnels in hot-standby (path protection) at key points where LFA doesn't work.
I've done tests to measure switchover time, so all of them have a switchover time <50ms.
So what's better? Using link-node protection (MPLS auto-frr), which creates a lot of auto-tunnels and makes troubleshooting a little bit harsh.
Or using path-protection with bfd (hot-standby), which also doubles the number of TE tunnels and requires bfd with aggressive timers?
I've read a lot of documentation and some vendors reccomended to use those both options.
Can someone share their experience with core FRR design? Maybe i'm just overthinking it, but i want to find proper solution.
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