A tunnel protection group protects end-to-end MPLS TE tunnels. If a working tunnel in a protection group fails, traffic switches to a protection tunnel, minimizing traffic interruptions.
Related Concepts
As shown in the Figure, concepts related to a tunnel protection group are as follows:
Working tunnel: a tunnel to be protected.
Protection tunnel: a tunnel that protects a working tunnel.
Protection switchover: switches traffic from a faulty working tunnel to a protection tunnel in a tunnel protection group, which improves network reliability.
Primary tunnels tunnel-1 and tunnel-2, and the bypass tunnel tunnel-3 are established on the ingress Access Node
Tunnel-3 is specified as a protection tunnel for primary tunnels tunnel-1 and tunnel-2 on Access Node. If the configured fault detection mechanism on the ingress detects a fault in tunnel-1, traffic switches to tunnel-3. Access Node attempts to reestablish tunnel-1. If tunnel-1 is successfully established, traffic switches back to the primary tunnel.
Implementation
A TE tunnel protection group uses a configured protection tunnel to protect traffic on the working tunnel to improve tunnel reliability. To ensure the improved performance of the protection tunnel, the protection tunnel must exclude links and nodes through which the working tunnel passes during network planning.
Protection mode
A tunnel protection group works in either 1:1 or N:1 mode. The 1:1 mode enables a protection tunnel to protect only a single working tunnel. The N:1 mode enables a protection tunnel to protect more than one working tunnel.
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