The standard protection switchover on a data communications network takes not more than 50 ms. Link redundancy is a prerequisite for switchover implementation.
Link protection modes include:
End-to-end protection: 1:1, 1+1, 1:N, and M:N
Local protection: fast reroute (FRR)
Faults detected by BFD and FRR can trigger protection switchovers.
Protection switchover functions are as follows:
Local request protection
Local real-time protection
Latency of switchover signal processing
Anti-switching against a single node
Switchover request coexistence and preemption