HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.1.x administrator guide (5697 - Page 234

Whatever routing policy a switch is using applies to the VE_Ports as well. See "Configuring and monitoring FCIP extension services" on page 375 for details about VE_Ports. To display the current routing policy and specify a different routing policy, use the aptPolicy command. The aptPolicy command detects the switch's configuration options and provides the appropriate policies for you to select from. You must disable the switch before changing the routing policy, and re-enable it afterward. To display the current and supported policies, enter the aptPolicy command with no parameters. In the following example, the current policy is exchange-based routing (3) with the additional AP dedicated link policy. switch:admin> aptpolicy Current Policy: 3 1(ap) 3 0(ap): Default Policy 1: Port Based Routing Policy 3: Exchange Based Routing Policy 0: AP Shared Link Policy 1: AP Dedicated Link Policy See the Fabric OS Command Reference for more details on the aptPolicy command. Static route assignment A static route can be assigned only when the active routing policy is port-based routing. When exchange-based routing is active, you cannot assign static routes. Static routes are supported only on the 4/8 SAN Switch, 4/16 SAN Switch, SAN Switch 4/32, and SAN Switch 4/32B platforms. Static routes are not supported on the 8/8 SAN Switch, 8/24 SAN Switch, 4/64 SAN Switch, 8/40 SAN Switch, 8/80 SAN Switch, 400 MP Router, 4/256 SAN Director, or DC SAN Backbone Director. Instead, you can use the traffic isolation feature to create a dedicated path for interswitch traffic. To assign a static route, use the uRouteConfig command. To remove a static route, use the uRouteRemove command. See the Fabric OS Command Reference for more details on the uRouteConfig and uRouteRemove commands. Frame order delivery The order of delivery of frames is maintained within a switch and determined by the routing policy in effect. The frame delivery behaviors for each routing policy are: • Port-based routing All frames received on an incoming port destined for a destination domain are guaranteed to exit the switch in the same order in which they were received. • Exchange-based routing All frames received on an incoming port for a given exchange are guaranteed to exit the switch in the same order in which they were received. Because different paths are chosen for different exchanges, this policy does not maintain the order of frames across exchanges. NOTE: Some devices do not tolerate out-of-order exchanges; in such cases, use the port-based routing policy. If even one switch in the fabric delivers out-of-order exchanges, then exchanges are delivered to the target out-of-order, regardless of the policy configured on other switches in the fabric. Some devices do not tolerate out-of-order exchanges; in such cases, use the port-based routing policy. 234 Routing traffic