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Brocade Web Tools Administrator's Guide v6.2.0 (53-1001194-01, April 2009)

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Web Tools Administrator’s Guide 213
53-1001194-01
Specifying frame order delivery
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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, see 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.
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, see 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.