LDP advertises and withdraws all interface IPv6 addresses using the Address/ Address-Withdraw message. Both the link local unicast address and the configured global unicast addresses of an interface are advertised.
Like LDP IPv4 sessions, LDP FEC types can be exchanged over an LDP IPv6 session. The LSR does not advertise a FEC for a link local address and, if received, the LSR does not resolve it.
An IPv4 or IPv6 prefix FEC can be resolved to an LDP IPv6 interface in the same way it is resolved to an LDP IPv4 interface. The outgoing interface and next hop are looked up in the RTM cache. The next hop can be the link local unicast address of the other side of the link or a global unicast address. The FEC is resolved to the LDP IPv6 interface of the downstream LDP IPv6 LSR that advertised the IPv4 or IPv6 address of the next hop.
A PW FEC can be resolved to a targeted LDP IPv6 adjacency with an LDP IPv6 LSR if there is a context for the FEC with local spoke SDP configuration or spoke SDP auto-creation from a service such as BGP-AD VPLS, BGP-VPWS, or dynamic MS- PW.