This feature makes a switch act as a neighbor discovery proxy for an IPv6 subnets. It can be used in conjunction with BUM

This configuration command features an IPv6 Neighbor Discovery (ND) option (called Boot File URL (BFURL) option)

LDP per-neighbor authentication provides greater flexibility in the authentication of LDP routers in a network. Individual routers or groups of routers may be configured with different passwords to enhance security and to ensure certain routers do not exchange MPLS