Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 910
Debug Layer 2 Protocol Tunneling, Provider Backbone Bridging
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www.dell.com | support.dell.com 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. The same is true for 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. Task Command Syntax Command Mode 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+. bpdu-destination-mac-address [stp | gvrp] provider-bridge-group CONFIGURATION 910 | Service Provider Bridging
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