Technical data

6-2 Fabric OS Administrator’s Guide

Publication Number: 53-0000518-09

Specifying the Routing Policy

The following routing policies are supported:

• Port-based path selection

Default on SilkWorm 3016, 3250, 3850, 3900, 12000, 24000, 48000 (using configuration options 1

through 4). These switches support the port-based policy only; you cannot change the routing

policy for these switches. SilkWorm 200E, 4012, and 4100 switches can also use port-based

routing.

• Device-based path selection

SilkWorm 200E, 4012, 4100, and 48000 (using configuration option 5).

If there are devices in your fabric that cannot accommodate out-of-order exchanges, then you

should use the device-based policy. Brocade recommends that you also use device-based routing

for FICON environments.

• Exchange-based path selection

Default on SilkWorm 200E, 4012, 4100, and 48000 (using configuration option 5)

Refer to Chapter 5, “Configuring SilkWorm 12000, 24000, and 48000 Directors” for more details about

SilkWorm 48000 configuration options.

You can use the aptPolicy command to display and specify a different routing policy. Note that if you

attempt to set the policy when the SilkWorm 48000 uses configuration options 1-4, an error message is

returned. Refer to the Fabric OS Command Reference Manual for more details on the aptPolicy

command.

You must disable the switch before changing the routing policy, and reenable it afterward.

In the following example, the routing policy for a SilkWorm 4100 is changed from exchange-based to

device-based:

switch:admin> aptpolicy

Current Policy: 3

3: Default Policy

1: Port Based Routing Policy

2: Device Based Routing Policy

3: Exchange Based Routing Policy

switch:admin> switchdisable

switch:admin> aptpolicy 2

Policy updated successfully.

switch:admin> switchenable

switch:admin> aptpolicy

Current Policy: 2