HP Brocade 4Gb SAN Switch for HP BladeSystem c-Class - Manual (Page 57)

Fabric OS 5.0.0 Advanced Web Tools user guide 57
This value is the upper limit for calculating buffer availability for other ports in the same port group.
If the actual distance is more than the desired distance, the port operates in buffer-limited mode.
c. Press Enter or click another port entry for the value to be accepted.
6. Optional: To enable long-distance compatibility so that ISLs in a fabric can be up to 100 km long (the
exact distance level is determined by the per-port configuration on the E_Ports of each ISL), select the
On radio button for Long Distance Compatibility.
NOTE: The switch must be disabled before you can select this option. If you select this option, you must
have an Extended Fabrics license, and both E_Ports in an ISL must be configured with the same
long-distance compatibility setting.
7. Click Apply.
Configuring routes
Routing policies are configured from the CLI. For Fabric OS v4.x, the supported routing policies are:
• Port-based
• Device-based (SAN Switch 4/32 only)
• Exchanged-based (SAN Switch 4/32 only)
For the SAN Switch 4/32, the exchange-based routing policy is the default.
To optimize port-based routing, enable the dynamic load sharing feature (DLS) to balance the load across
the available output ports within a domain. 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, in
which the software chooses a path based on current traffic conditions. Refer to the HP StorageWorks
Fabric OS 4.x procedures user guide for more information.
The Routing tab of the Switch Admin module displays routing information. Figure 12 shows the Routing tab
when the port-based routing policy is enabled. When a device-based or exchange-based routing policy is
enabled, the interface is different: the Static Route information and the Dynamic Load Sharing radio
buttons are not displayed.