Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 554)

Source EX_Ports can balance loads across multiple destination EX_Ports attached to the same edge
fabric using exchange IDs from the routed frames as keys to distribute the traffic.
Setting router port cost for an EX_Port
The router port cost value for an EX_Port is set automatically when the EX_Port is created. You can
modify the cost for that port to force a path to have a higher or lower cost.
You can configure the EX_Port or VEX_Port with values of either 1,000 or 10,000. For example, if you
want to differentiate between two EX_Port links with different speeds, you can assign 1,000 to one link
and 10,000 to the other link.
1. Enter the portDisable command to disable any port on which you want to set the router port cost.
switch:admin> portdisable 7/10
2. Enable EX_Port or VEX_Port mode with the portCfgEXPort or portCfgVEXPort command.
switch:admin> portcfgexport 7/10 -a 1
3. Enter the fcrRouterPortCost command to display the router port cost for each EX_Port.
switch:admin> fcrrouterportcost
Port Cost
------------------------
7/3 1000
7/4 1000
7/9 1000
7/10 1000
7/13 1000
10/0 1000
You can also use the fcrRouteShow command to display the router port cost.
To display the router port cost for a single EX_Port, enter the fcrRouterPortCost command with a
port and slot number.
switch:admin> fcrrouterportcost 7/10
Port Cost
------------------------
7/10 1000
4. 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
5. Enter the portEnable command to enable the ports that you disabled in step 1.
switch:admin> portenable 7/10
Shortest IFL cost configuration
You can direct traffic flow to take the shortest path between host and target when multiple FC routers
in the backbone are connected to an edge fabric. Shortest inter-fabric link mode is disabled by default.
When you enable shortest IFL mode, an FC router can choose a lowest cost ISL path in the backbone
Setting router port cost for an EX_Port
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