The 7210 SAS supports the MS-PW path trace mode of operation for VCCV-trace, as per pseudowire switching, but using FEC129 AII type 2. As in the case of VCCV-ping, the SAII:TAII used in the VCCV-trace echo request message sent from the T-PE or S-PE, from which the vccv-trace command is executed, is specified by the user or derived from the context of the MS-PW.
The use of spoke-sdp-fec-id in vccv-trace is only applicable at T-PE nodes, since it is not configured for a specific MS-PW at S-PE nodes