Cisco Discovery Protocol (CDP), Digital Trunking Protocol (DTP), Port Aggregation Protocol (PAGP), Uni-directional Link Detection (UDLD), and Virtual Trunk Protocol (VTP) are supported. These protocols automatically pass the other protocols tunneled by L2PT toward the CPM and all carry the same specific Cisco MAC.
The existing L2PT limitations apply.
The protocols apply only to VPLS.
The protocols are mutually exclusive with running STP on the same VPLS as soon as one SAP has L2PT enabled.
Forwarding occurs on the CPM.