Brocade Web Tools Administrator's Guide (53-1000606-01, October 2007)

Web Tools Administrator’s Guide 195
53-1000606-01
Specifying frame order delivery
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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 29.
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 29.
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.
Configuring the link cost for a port
This section describes how to set the cost of an interswitch link (ISL). The cost of a link is a
dimensionless positive number. The fabric shortest path first (FSPF) protocol compares the cost of
various paths between a source switch and a destination switch by adding the costs of all the ISLs
along each path. FSPF chooses the path with minimum cost. If multiple paths exist with the same
minimum cost, FSPF employs load sharing over these paths.
Every ISL has a default cost that is inversely proportional to its bandwidth. For a 1-Gbit/sec ISL, the
default cost is 1000. For a 2-Gbit/sec ISL, the default cost is 500.
Use this procedure to set a non-default, “static” cost for any port.