Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 106)

Routing policies
By default, all routing protocols place their routes into a routing table. You can control the routes that a
protocol places into each table and the routes from that table that the protocol advertises by defining
one or more routing policies and then applying them to the specific routing protocol.
The routing policy is responsible for selecting a route based on one of three user-selected routing
policies:
• Port-based routing
• Exchange-based routing
• Device-based routing
Notes
Routing is handled by the FSPF protocol and routing policy.
Each switch can have its own routing policy and different policies can exist in the same fabric.
ATTENTION
For most configurations, the default routing policy is optimal and provides the best performance. You
should change the routing policy only if there is a significant performance issue, or a particular fabric
configuration or application requires it.
Displaying the current routing policy
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the aptPolicy command with no parameters.
The current policy is displayed, followed by the supported policies for the switch.
In the following example, the current policy is device-based routing (2).
switch:admin> aptpolicy
Current Policy: 2
3 : Default Policy
1: Port Based Routing Policy
2: Device Based Routing Policy (FICON support only)
3: Exchange Based Routing Policy
Port-based routing
The choice of routing path is based only on the incoming port and the destination domain. To optimize
port-based routing, Dynamic Load Sharing (DLS) can be enabled to balance the load across the
available output ports within a domain.
NOTE
For FC routers only: When an FC router is in port-based routing mode, the backbone traffic is load-
balanced based on SID and DID. When an FC router is in exchange-based routing mode, the
backbone traffic is load-balanced based on SID, DID, and OXID.
Routing policies
106 Fabric OS Administrators Guide
53-1003130-01