MAC address deletion

The following rules are defined for MAC address deletion. Every MAC deletion triggers the MAC resolution algorithm and reprograms the MAC entry if required.

If a PW is down, MAC addresses flushed locally and individual MAC deletion messages are sent to the MCT Peer. This is similar to the Layer 2 CEP port-down handling.
If PW client is undeploy on MCT 1, only one MAC withdraw message is send to MCT 2.
All MAC addresses tagged to the PW client are flushed.
If MCT 2 detects that MCT 1 is down or if the session is down, all VPLS MAC addresses learned from MCT 1 are flushed.