HP StorageWorks 1606 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 520

21 EX_Port frame trunking configuration 4. Enter the fcrRouterPortCost command with a port and slot number, to display the router port cost for a single EX_Port. switch:admin> fcrrouterportcost 7/10 Port Cost 7/10 1000 5. Enter the appropriate form of the fcrRouterPortCost command based on the task you want to perform: • To set the router port cost for a single EX_Port, enter the command with a port and slot number and a specific cost: switch:admin> fcrrouterportcost 7/10 10000 • To set the cost of the EX_Port back to the default, enter a cost value of 0: switch:admin> fcrrouterportcost 7/10 0 6. Enter the portEnable command to enable the ports that you disabled in step 1. switch:admin> portenable 7/10 EX_Port frame trunking configuration In Fabric OS v5.2.0 and later, you can configure EX_Ports to use frame-based trunking just as you do regular E_Ports. EX_Port frame trunking support is designed to provide 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. 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. After initiation, the first port from the trunk group that comes online is designated as the master port. The other ports that come online on the trunk group are considered the slave ports. Adding or removing a slave port does not cause frame drop; however, removing a slave port causes the loss of frames in transit. 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. ATTENTION This feature should be enabled only if the entire configuration is running Fabric OS v5.2.0 or later. If router port cost is used with EX_Port trunking, the master port and slave ports share the router port cost of the master port. For information about setting up E_Port trunking on an edge fabric, see Chapter 19, "Managing Trunking Connections," in this guide. Masterless EX_Port trunking Starting in Fabric OS 6.3.0, EX_Port frame-based trunking is masterless. This means that if the master port goes offline, one of the slave ports automatically becomes the new master port and all of the other slave ports stay online, thus avoiding traffic disruption. The new master port uses the old master port area and the old master port is assigned a new, unused area. In this way, the PID of the trunk does not change if the master port goes offline. 478 Fabric OS Administrator's Guide 53-1001336-01