Pseudowire headend termination for Layer 3 VPN and Multicast VPN

The support for pseudowire subscriber service interface over redundant logical tunnels is introduced in Layer 3 VPNs and draft-rosen multicast VPNs. Earlier, Layer 3 VPNs provided support for pseudowire subscriber services over logical tunnel interfaces only, and these interfaces used unicast routing protocols, such as OSPF and BGP. This feature introduces provisioning of a multicast routing protocol, Protocol Independent Multicast (PIM), on the pseudowire subscriber interfaces, which gets terminated on the virtual routing and forwarding (VRF) routing instance. With this feature, you can enable pseudowire subscriber interfaces for inet, inet6, dual inet, and inet6 stack families, and benefit from the additional resiliency support because of the increase in pseudowire logical interface devices scaling numbers.