Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 122
Route selection, Dynamic Load Sharing, Setting DLS
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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 (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. 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 Use the following procedure to set up DLS: 1. Connect to the switch and log in using an account with admin permissions. 2. Enter the dlsShow command to view the current DLS setting. One of the following messages appears: • "DLS is set" indicates that DLS is turned on. • "DLS is not set" indicates that DLS is turned off. • "DLS is set with Lossless enabled." DLS is enabled with the Lossless feature. Load sharing is recomputed with every change in the fabric, and existing routes can be moved to maintain optimal balance. In Lossless mode, no frames are lost during this operation. • "DLS is set by default with current routing policy. DLS is set with Lossless enabled." The current routing policy (exchange-based) requires DLS to be enabled by default. In addition, the Lossless option is enabled. Frame loss is prevented during a load sharing recomputation. 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 122 Fabric OS Administrator's Guide 53-1002745-02
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