Configuring a loopback

If a loopback is configured on a spoke-SDP, all traffic on the ingress direction of the spoke-sdp and associated with the ingress vc-label is forwarded to the egress direction of the spoke-SDP. A loopback may be configured at either a T-PE or an S-PE. It is recommended that an administrative lock is configured before configuring the loopback on a spoke-SDP. This is enforced by the NMS.

A data path loopback is configured using a tools perform command, as follows:

tools
   perform
      service-id <svc-id> 
         loopback
            pw
               sdp <sdp-id>:<vc-id> {start | stop}

The following constraints and conditions apply for PW loopback configuration: