User Manual

Fabric OS 5.0.0 procedures user guide 99
6 Routing traffic
This chapter contains procedures for configuring HP StorageWorks switch routing features. For details on
the commands used in the procedures, refer to the HP StorageWorks Fabric OS 4.x command reference
guide.
This chapter contains the following sections:
• About routing policies, page 99
• Specifying the routing policy, page 99
• Assigning a static route, page 100
• Specifying frame order delivery, page 100
• Using dynamic load sharing, page 101
• Viewing routing path information, page 102
• Viewing routing information along a path, page 104
About routing policies
All HP StorageWorks switches support port-based routing, in which the routing path chosen for an
incoming frame is based only on the incoming port and the destination domain. To optimize port-based
routing, enable the Dynamic Load Sharing feature (DLS) to balance the load across the available output
ports within a domain.
The SAN Switch 4/32 allows you to tune routing performance with these additional routing policies:
• Device-based routing, in which the choice of routing path is based on the Fibre Channel addresses of
the source device (SID) and the destination device (DID), improving path utilization for
better performance
• Exchange-based routing, in which the choice of routing path is based on the SID, DID, and Fibre
Channel originator exchange ID (OXID), optimizing path utilization for the best performance
Device-based and exchange-based routing require the use of DLS; when these policies are in effect, you
cannot disable the DLS feature.
Using port-based routing, you can assign a static route, in which the path chosen for traffic never
changes. In contrast, device-based and exchange-based routing policies always employ dynamic path
selection.
Specifying the routing policy
In addition to port-based routing, which all HP StorageWorks switches support, the SAN Switch 4/32
supports additional routing policies and allows you to specify the active routing policy using the
aptpolicy command.
The following routing policies are supported:
• 1: Port-based path selection, which is the default on the SAN Switch 2/8V, SAN Switch 2/16V, SAN
Switch 2/32, Core Switch 2/64, and SAN Director 2/128