Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

74 Fabric OS Administrator’s Guide
53-1002148-02
Route selection
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The AP policy affecting the DPS behavior, whether it is exchange-based, device-based, or
port-based, is configured on a per-logical switch basis. In-order delivery (IOD) and DLS settings are
set per logical switch as well. IOD and DLS settings for the base switch affect all traffic going over
the base fabric including any logical fabric traffic that uses the base fabric.
CAUTION
Setting the routing policy is disruptive to the fabric because it requires that you disable the switch
where the routing policy is being changed.
Setting the routing policy
1. Connect to the VF switch and log in as admin.
2. Enter the setcontext command for the correct FID.
switch:admin> setcontext 20
3. Enter the switchDisable command to disable the switch.
4. Take the appropriate following action based on the AP route policy you choose to implement:
• If the exchange-based policy is required, enter the aptPolicy 3 command.
• If the port-based policy is required, enter the aptPolicy 1 command.
Setting up the AP route policy
The AP route policy can only be set in the base switches that are using virtual fabrics.
1. Connect to the base switch and log in as admin.
2. Enter the switchDisable command to disable the switch.
3. Take the appropriate following action based on the AP route policy you choose to implement:
• If the AP Shared Link policy (default) is required, enter the aptPolicy -ap 0 command.
• If the AP Dedicated Link policy is required, enter the aptPolicy -ap 1 command.
Route selection
Selection of specific routes can be dynamic, so that the router can constantly adjust to changing
network conditions; or it may be static, so that data packets always follow a predetermined path.
Dynamic Load Sharing
The exchange-based routing policy depends on the Fabric OS Dynamic Load Sharing (DLS) feature
for dynamic routing path selection. When using the exchange-based routing policy, DLS is enabled
by default and cannot be disabled. In other words, you cannot enable or disable DLS when the
exchange-based routing policy is in effect.