LDP native IPv6

LDP is supported in an IPv6 network only, and in an IPv6 or IPv4 dual-stack network. Configure the address family as inet for IPv4 or inet6 for IPv6. By default, IPv6 is used as the TCP transport for an LDP session with its peers when both IPv4 and IPv6 are enabled. The dual-transport statement allows Junos OS LDP to establish the TCP connection over IPv4 with IPv4 neighbors, and over IPv6 with IPv6 neighbors as a single-stack LSR. The inet-lsr-id and inet6-lsr-id are the two LSR IDs that have to be configured to establish an LDP session over IPv4 and IPv6 TCP transport. These two IDs should be non-zero and must be configured with different values.