The SDP of type LDP with far-end and tunnel-farend options using IPv6 addresses is supported. The addresses need not be of the same family (IPv6 or IPv4) for the SDP configuration to be allowed. The user can have an SDP with an IPv4 (or IPv6) control plane for the T-LDP session and an IPv6 (or IPv4) LDP FEC as the tunnel.
Because IPv6 LSP is only supported with LDP, the use of a far-end IPv6 address is not allowed with a BGP or RSVP/MPLS LSP. In addition, the CLI does not allow an SDP with a combination of an IPv6 LDP LSP and an IPv4 LSP of a different control plane. As a result, the following commands are blocked within the SDP configuration context when the far-end is an IPv6 address:
bgp-tunnel
lsp
mixed-lsp-mode
SDP admin groups are not supported with an SDP using an LDP IPv6 FEC, and the attempt to assign them is blocked in CLI.
Services that use LDP control plane (such as T-LDP VPLS and R-VPLS, VLL, and IES/VPRN spoke interface) have the spoke SDP (PW) signaled with an IPv6 T-LDP session when the far-end option is configured to an IPv6 address. The spoke SDP for these services binds by default to an SDP that uses a LDP IPv6 FEC, which prefix matches the far end address. The spoke SDP can use a different LDP IPv6 FEC or a LDP IPv4 FEC as the tunnel by configuring the tunnel-far-end option. In addition, the IPv6 PW control word is supported with both data plane packets and VCCV OAM packets. Hash label is also supported with the above services, including the signaling and negotiation of hash label support using T-LDP (Flow sub-TLV) with the LDP IPv6 control plane. Finally, network domains are supported in VPLS.