Reference Guide

originally specified in 802.1Q. Only bridges in the service provider network use this destination MAC address so these bridges
treat BPDUs originating from the customer network as normal data frames, rather than consuming them.
The same is true for GARP VLAN registration protocol (GVRP). 802.1ad specifies that provider bridges participating in GVRP
use a reserved destination MAC address called the Provider Bridge GVRP Address, 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.
● Use the Provider Bridge Group address as the destination MAC address in BPDUs. The xstp keyword applies this
functionality to STP, RSTP, and MSTP; this functionality is not available for PVST+.
CONFIGURATION
bpdu-destination-mac-address [xstp | gvrp] provider-bridge-group
Service Provider Bridging 699