Dell Brocade G620 Brocade 8.0.1 Fabric OS Administratiors Guide - Page 518
EX_Port frame trunking configuration, Domain 40 to FC router ID Domain 30
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Using FC-FC Routing to Connect Fabrics ∙ The following example shows the cumulative ISL cost for the second path identified in step 3: first from FC router ID Domain 40 to FC router ID Domain 30, and then from FC router Domain ID 30 to FC router ID Domain 20. switch:admin>linkcost 10 Interface10 (E_PORT) Cost 500 switch:admin>linkcost 10 Interface10 (E_PORT) Cost 500 The cumulative link cost for this path is 1000. This path is now known as path 2. Path 1 is selected as the low cost path. 5. Enter the linkcost command to set low cost values, ensuring that the cumulative ISL cost for the selected path is lower than that of all other paths. A low cost path should have a cumulative ISL cost of less than 10,000. ∙ In the following example, the ISL link cost of path 2 from FC router ID Domain 40 to FC router Domain ID 30 is modified. switch:admin>linkcost 10 5000 Interface10 (E_PORT) Cost 5000 ∙ In the following example, the ISL link cost of path 2 from FC router Domain 30 to FC router Domain 20 is modified. switch:admin>linkcost 10 5000 Interface10 (E_PORT) Cost 5000 The modified cumulative link cost for path 2 is 10,000. 6. Enter the fcrConfigure --enable -shortestifl command to enable the shortest IFL mode in all the FC routers in the backbone fabric. switch:admin> fcrconfigure --enable -shortestifl Shortest IFL path is enabled 7. Enter the fcrConfigure -show command to verify that the shortest IFL mode is enabled in all the FC routers in the backbone fabric. switch:admin> fcrconfigure --show Backbone fabric ID: 128 Shortest IFL feature is enabled 8. Verify that the link cost of both the front domain and translate domain in the source edge fabric have been modified using the lsDbShow command. linkCnt = 2, flags = 0x0 LinkId = 160, out port = 160 rem port = 241, cost = 10001, costCnt = 0, type = 1 LinkId = 161, out port = 161, rem port = 242, cost = 10000, costCnt = 0, type = 1 EX_Port frame trunking configuration EX_Port frame trunking provides the best utilization and balance of frames transmitted on each link between the FC router and the edge fabric. You should trunk all ports connected to the same edge fabrics. You configure EX_Ports to use frame-based trunking just as you do regular E_Ports. The restrictions for EX_Port frame trunking are the same as for E_Ports. All the ports must be adjacent to each other using the clearly marked groups on the front of the product. The FC router front domain has a higher node WWN, derived from the FC router, than that of the edge fabric. Therefore, the FC router front domain initiates the trunking protocol on the EX_Port. Brocade Fabric OS Administration Guide, 8.0.1 518 53-1004111-02
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