L2PT termination for only STP (Spanning Tree Protocol) and PVST (Per VLAN Spanning Tree Protocol), Cisco Discovery Protocol (CDP), Digital Trunking Protocol (DTP), Port Aggregation Protocol (PAgP), Uni-directional Link Detection (UDLD), Virtual Trunk Protocol (VTP), STP (Spanning Tree Protocol) and PVST (per-VLAN Spanning Tree protocol) are supported on 7210 SAS devices.
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 cannot be used while running STP on the same VPLS as soon as one SAP has L2PT/BPDU translation enabled.
Forwarding occurs on the CPM and uses CPU processing cycles.