HP StorageWorks 8/8 Brocade Web Tools Administrator's Guide v6.3.0 (53-1001343 - Page 259
Specifying frame order delivery
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Specifying frame order delivery 16 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 either when a switch boots up or each time an E_Port or FX_Port goes online or offline. Enabling this feature allows a path to be discovered automatically by the FSPF path-selection protocol. For more information regarding DLS, refer to the dlsset command in the Fabric OS Command Reference. 1. Open the Switch Administration window as described on page 41. 2. Click the Routing tab. 3. Click On in the Dynamic Load Sharing (DLS) area to enable dynamic load sharing or click Off to disable dynamic load sharing. When the exchange-based routing policy is in effect, the DLS radio buttons appear on the Routing tab 4. Click Apply. A warning message is displayed, "Credit Recovery for Long distance links should be turned off using CLI while enabling DLS". Specifying frame order delivery In a stable fabric, frames are always delivered in order, even when the traffic between switches is shared among multiple paths. However, when topology changes occur in the fabric (for example, if a link goes down), traffic is rerouted around the failure, and some frames could be delivered out of order. By default, frame delivery is out-of-order across topology changes. However, if the fabric contains destination devices that do not support out-of-order delivery, you can force in-order frame delivery across topology changes. Enabling in-order delivery (IOD) guarantees that frames are either delivered in order or dropped. For more information regarding IOD, refer to the Fabric OS Administrator's Guide. NOTE Enabling in-order delivery can cause a delay in the establishment of a new path when a topology change occurs, and therefore should be used with care. 1. Open the Switch Administration window as described on page 41. 2. Click the Routing tab. 3. Click On in the In-Order Delivery (IOD) area to force in-order frame delivery across topology changes or click Off to restore out-of-order frame delivery across topology changes. 4. Click Apply. Web Tools Administrator's Guide 227 53-1001343-01