Extension of pseudowire redundancy condition to logical Interfaces

Pseudowire redundancy condition is supported on MPLS pseudowire subscriber logical interface. This is similar to the pseudowire redundancy feature for mobile backhaul by using the logical tunnel paired (lt-) interfaces. The primary or backup pseudowire is terminated at the provider edge routers (ps0.0) and the corresponding pseudowire (ps0.1 to ps0.n) service logical interfaces connected to Layer 3 domain by configuring those service logical interfaces in the Layer 3VPN routing instances. There is a Layer 2 circuit across MLPS access node and provider edge with the pseudowire service on transport logical interface (ps0.0) as the local interface of Layer 2 circuit terminating at the provider edge device.