MPLS-TP pseudowires: VCCV-ping/VCCV-trace

For vccv-ping and vccv-trace commands:

If the spoke SDP referred to by the sdp-id:vc-id has an MPLS-TP PW-Path-ID defined, then those parameters are used to populate the static PW TLV in the target FEC stack of the VCCV ping or VCCV trace packet. If a global ID and node ID are specified in the command, then these values are used to populate the destination node TLV in the VCCV ping or VCCV trace packet.

The global ID/node ID are only used as the target node identifiers if the vccv-ping is not end-to-end (for example, a TTL is specified in the VCCV ping/trace command and it is less than 255); otherwise, the value in the PW Path ID is used. For VCCV ping, the dest-node-id may be entered as a 4-octet IP address in the form a.b.c.d or as a 32-bit integer ranging from 1 to 4294967295. For VCCV trace, the destination node ID and global ID are taken from the spoke-sdp context.

The same command syntax is applicable for SAA tests configured under configure saa test a type.