HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.2 administrator guide (5697-0 - Page 288

AP route policy On the HP StorageWorks 400 Multi-Protocol Router and B-Series Multi-Protocol Router Blade, there are eight internal physical links used by EX_ and VEX_Port functionality. The links are shared by both ingress and egress traffic on EX_ and VEX_Ports. The AP (appliance) route policy dedicates some links for ingress traffic and some links for egress traffic. The new AP Dedicated Link Policy relieves internal congestion in an environment where: • There is a large amount of traffic going through both directions at the same time • There is a reduction of the impact of slow devices on the overall switch performance HP recommends that the default AP Shared Link Policy be used for most environments and that you design a SAN that will localize Host to Target traffic by reducing the amount of traffic through the router. The two additional supported AP policies are: • AP Shared Link policy (default) • AP Dedicated Link policy The AP policies are independent of the routing policies. Every routing policy supports both AP policies. IMPORTANT: Setting this policy is a disruptive process. Routing in Virtual Fabrics Virtual Fabrics support DPS on all partitions. DPS is limited where multiple paths are available for a Logical Fabric frame entering a Virtual Fabric chassis from a base fabric that is sent out using one of the dedicated ISLs in a Logical Switch. 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. 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; it requires that you disable the switch where the routing policy is being changed. Setting the routing policy 1. Connect to the switch and log in as admin. 2. Enter the switchDisable command to disable the switch. 3. Take the appropriate action based on the route policy you choose to implement: • If Exchange-based policy is required, enter the aptPolicy 3 command. • If Port-based policy is required, enter the aptPolicy 1 command. Setting up the AP route policy 1. Connect to the switch and log in as admin. 2. Enter the switchDisable command to disable the switch. 3. Take the appropriate action based on the route policy you choose to implement: • If AP Shared Link policy (default) is required, enter the aptPolicy -ap 0 command. • If 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. 286 Routing traffic