Brocade Fabric OS Command Reference (Supporting Fabric OS v7.3.0) User Manual

Page 87

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Fabric OS Command Reference

53-1003131-01

aptPolicy

Device-based routing is also a form of Dynamic Path Selection (DPS). DPS
assigns communication paths between end devices in a fabric to egress ports in
ratios proportional to the potential bandwidth of the ISL, ICL, or trunk group. When
there are multiple paths to a destination, the input traffic is distributed across the
different paths in proportion to the bandwidth available on each of the paths. This
improves utilization of the available paths and reduces possible path congestion.

Exchange-based routing policy (default). With this policy, the path chosen for an
ingress frame is based on all of the following items:

•

The ingress port on which the frame was received.

•

The FC address of the SID for this frame.

•

The FC address of the DID for this frame.

•

The FC OXID for this frame.

This policy optimizes the utilization of the available paths by allowing I/O traffic
between different SID, DID, or OXID pairs to use different paths. All frames
received on an ingress port with the same SID, DID, or OXID parameters take the
same path unless there is a fabric event. Refer to dlsSet for the definition of a
fabric event.

This policy does not support static routes. DLS is always enabled and the DLS
setting cannot change with this policy.

EXAMPLES

To display the current APT policy:

switch:admin> aptpolicy

Current Policy: 3

3: Default Policy

1: Port Based Routing Policy

2: Device Based Routing Policy (FICON support only)

3: Exchange Based Routing Policy

To change the current APT policy to the exchange-based routing policy:

switch:admin> aptpolicy 3

Switch must be disabled in order to modify \

this configuration parameter. To disable the switch, \

use the "switchDisable" command.

switch:admin> switchdisable