Administrator Guide

01-80-C2-00-00-0D, to exchange GARP PDUs instead of the GVRP Address, 01-80-C2-00-00-21, specified
in 802.1Q. Only bridges in the service provider network use this destination MAC address so these bridges
treat GARP PDUs originating from the customer network as normal data frames, rather than consuming them.
Provider backbone bridging through IEEE 802.1ad eliminates the need for tunneling BPDUs with L2PT and
increases the reliability of provider bridge networks as the network core need only learn the MAC addresses
of core switches, as opposed to all MAC addresses received from attached customer devices.
Service Provider Bridging 829