Brocade Web Tools Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 114)

NOTE
BB credit is not applicable for VE and ICL ports.
8. Select a port or ports under Selected Ports.
9. Click the right arrow to set the BB credit value for the selected ports and click OK.
The value displays in the table of the Port Admin tab. If no value is configured, the F-Port BB
Credit column displays the default value.
Configuring ALPA
PID is the address assigned to the host when it performs a login with a fabric. The 24 bits of the PID
are built from three 1-byte fields. The most significant byte is the Domain ID, the second byte is the
Area which that device belongs to, and the least significant byte is the ALPA.
Persistent ALPA provides the hosts with the same ALPA that they received the first time they logged
in. If they log in using the same port, the domain and the area for that device are still the same. This
ensures that whenever a host logs in using the same port, it receives the same PID. The hosts can
select their ALPA and the switch provides the same value, if it is available.
By default, persistent ALPA is disabled on Access Gateway switches. Access Gateway always tries to
request the same ALPA which the host has requested to the edge switch, but there is a possibility that
the ALPA value has already been taken by another host. Therefore, the device can either use a
different ALPA value (FLEXIBLE ALPA) which is available or can stick to the same requested ALPA
value (STRINGENT ALPA). As the Access Gateway controls the assignment of ALPA values to the
devices, it knows which ALPA value has been taken and which is free. With the FLEXIBLE ALPA
option, the host login is accepted with either the requested ALPA value or a different ALPA value. With
STRINGENT ALPA, if the requested ALPA value is not available, the login is rejected.
The Enable/Disable of Persistent ALPA feature is available on the Switch tab of the Switch Admin
dialog box. The Persistent ALPA tables start populating as soon as the Access Gateway boots and the
devices start logging in.
NOTE
Persistent ALPA is supported on all the Access Gateway platforms, except the Brocade Encryption
Switch. Persistent ALPA is not supported in non-Brocade fabrics.
To configure Persistent ALPA, perform the following steps.
1. Select Configure > Switch Admin > Switch tab.
2. Select Enable for Persistent ALPA Mode.
This enables the Stringent ALPA and Flexible ALPA options.
3. Select either Stringent ALPA or Flexible ALPA.
4. Click Apply.
5. Close the Switch page.
6. Select Port Admin tab.
7. Select an F_Port or U_Port from the device tree or Port List table.
8. Select ALPA Map from the Actions list.
The Port WWN Map dialog box launches listing the Port WWN to ALPA Map with the host. The
Port WWN map automatically populates.
Configuring ALPA
114 Web Tools Administrator's Guide
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