Service (SVC) ping is initiated from a 7705 SAR router to verify round-trip connectivity and delay to the far end of the service. Service ping applies to GRE, IP, and MPLS tunnels and tests the following from edge-to-edge:
tunnel connectivity
VC label mapping verification
service existence
service provisioned parameter verification
round-trip path verification
service dynamic configuration verification
By default, service ping uses GRE encapsulation.