Redundant virtual tunnel (VT) interfaces in Multiprotocol BGP (MBGP) multicast VPNs (MVPNs)

VT interfaces are needed for multicast traffic on routing devices that function as combined provider edge (PE) and provider core (P) routers to optimize bandwidth usage on core links. VT interfaces prevent traffic replication when a P router also acts as a PE router (an exit point for multicast traffic). You can configure up to eight VT interfaces in a routing instance, thus providing Tunnel PIC redundancy inside the same multicast VPN routing instance. When the active VT interface fails, the secondary one takes over, and you can continue managing multicast traffic with no duplication. To configure, include multiple VT interfaces in the routing instance and, optionally, apply the primary statement to one of the VT interfaces.