It is possible to apply an administrative lock and loopback to one or more spoke-SDPs within a redundant set. That is, it is possible to move a spoke-SDP from an existing endpoint to a test service. When an administrative lock is applied to a spoke-SDP, it becomes operationally down and cannot send or receive traffic from the normal service SAP or spoke interface. If the lock is applied to all the spoke-SDPs in a service, all the spoke-SDPs become operationally down.