Enable/disable L2PT protocols on the port. Select this option to have the Switch tunnel CDP
(Cisco Discovery Protocol) packets so that other Cisco devices can be discovered through the
service provider's network. Select this option to have the Switch tunnel STP (Spanning Tree Protocol)
packets so that STP can run properly across the service provider's network and spanning trees
can be set up based on bridge information from all (local and remote) networks. Select this option
to have the Switch tunnel VTP (VLAN Trunking Protocol) packets so that all customer switches can
use consistent VLAN configuration through the service provider's network.