Dell Force10 C300 FTOS Configuration Guide FTOS 8.4.2.7 E-Series TeraScale, C- - Page 971

Rate-limit BPDUs on the C-Series and S-Series CAM space is allocated in sections called Field Processor (FP) blocks. There are total 13 user-configurable FP blocks on the C-Series and S-Series. The default number of blocks for L2PT is 0; you must allocate at least one to enable BPDU rate-limiting. Step 1 2 Task Command Syntax Create at least one FP group for L2PT. See CAM Allocation on page 289 for details on this command. cam-acl l2acl Save the running-config to the startup-config. copy running-config startup-config 3 Reload the system. reload 4 Set a maximum rate at which the RPM will protocol-tunnel rate-limit process BPDUs for L2PT. Default: no rate limiting C-Series Range: 64 to 640 kbps S-Series Range: 64 to 320 kbps Command Mode CONFIGURATION EXEC Privilege EXEC Privilege VLAN STACKING Debug Layer 2 Protocol Tunneling Task Display debugging information for L2PT. Command Syntax debug protocol-tunnel Command Mode EXEC Privilege Provider Backbone Bridging c s Provider Backbone Bridging is supported only on platforms: 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. Service Provider Bridging | 971