HP StorageWorks 1606 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 106

4 Route selection 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 feature (DLS) 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. When the port-based policy is in force, you can enable DLS to optimize routing. When DLS is enabled, it shares traffic among multiple equivalent paths between switches. DLS recomputes load sharing when any of the following occurs: • a switch boots up • an E_Port goes offline and online • an EX_Port goes offline • a device goes offline Setting DLS 1. Connect to the switch and log in as admin. 2. Enter the dlsShow command to view the current DLS setting. One of the following messages appears: • "DLS is set" indicates that dynamic load sharing is turned on. • "DLS is not set" indicates that dynamic load sharing is turned off. • "DLS cannot be changed with current routing policy" indicates that you are using the exchange-based routing policy and you cannot enable or disable DLS. If you get this message, you cannot perform step 3, so you are done with this procedure. 3. Enter the dlsSet command to enable DLS or enter the dlsReset command to disable it. Example of setting and resetting DLS. switch:admin> dlsshow DLS is not set switch:admin> dlsset switch:admin> dlsshow DLS is set switch:admin> dlsreset switch:admin> dlsshow DLS is not set 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 Brocade 4100 and 5000 platforms. 64 Fabric OS Administrator's Guide 53-1001336-01