This section describes how MVRP reacts to changes in the instantiated SAP status.
There are a number of mechanisms that may generate operational or admin down status for the SAPs and VPLS instances controlled by MVRP:
Port down
MAC move
Port MTU too small
Service MTU too small
The shutdown of the whole instantiated VPLS or instantiated SAPs is disabled in both VPLS and VPLS SAP templates. The no shutdown option is automatically configured.
In the port down case, the MVRP is also operationally down on the port so no VLAN declaration occurs.
When MAC move is enabled in a data VPLS controlled by MVRP, in case a MAC move happens, one of the instantiated SAPs controlled by MVRP may be blocked. The SAP blocking by MAC move is not reported though to the MVRP control plane. As a result, MVRP keeps declaring and registering the related VLAN value on the control SAPs, including the one that shares the same port with the instantiate SAP blocked by MAC move, as long as MVRP conditions are met. For MVRP, an active control SAP is one that has MVRP enabled and MSTP is not blocking it for the VLAN value on the port. Also in the related data VPLS, one of the two conditions must be met for the declaration of the VLAN value: there must be either a local user SAP or at least one MVRP registration received on one of the control SAPs for that VLAN.
In the last two cases, VLAN attributes get declared or registered even when the instantiated SAP is operationally down, also with the MAC move case.