For details about this command, refer to CAM Allocation.
2 Save the running-config to the startup-config.
EXEC Privilege mode
copy running-config startup-config
3 Reload the system.
EXEC Privilege mode
reload
4 Set a maximum rate at which the RPM processes BPDUs for L2PT.
VLAN STACKING mode
protocol-tunnel rate-limit
The default is: no rate limiting.
The range is from 64 to 320 kbps.
Debugging Layer 2 Protocol Tunneling
To debug Layer 2 protocol tunneling, use the following command.
• Display debugging information for L2PT.
EXEC Privilege mode
debug protocol-tunnel
Provider Backbone Bridging
IEEE 802.1ad—Provider Bridges amends 802.1Q—Virtual Bridged Local Area Networks so that service
providers can use 802.1Q architecture to offer separate VLANs to customers with no coordination between
customers, and minimal coordination between customers and the provider.
802.1ad specifies that provider bridges operating spanning tree use a reserved destination MAC address called
the Provider Bridge Group Address, 01-80-C2-00-00-08, to exchange BPDUs instead of the Bridge Group
Address, 01-80-C2-00-00-00, 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.
Service Provider Bridging 967
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