Brocade Web Tools Administrator's Guide - Supporting Fabric OS v7.0.0 (53-1002152-01, March 2012)

92 Web Tools Adminstrator’s Guide
53-1002152-01
Configuring BB credits on an F_Port
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Configuring BB credits on an F_Port
In Fabric OS v6.4.0 and later, you can configure the BB credits value on an F_Port. Follow the steps
given below.
1. Select a port in the Switch View to open the Port Administration window.
2. Select the FC Ports tab.
3. Click Show Advanced Mode.
4. Click F-Port BB Credit.
5. Enter the BB credit value in the Enter BB Credit field (the default value is 8).
NOTE
You cannot modify the default BB credit value for VE and ICL ports.
6. Click OK.
The value displays in the table of the Port Administration window. 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 which they recieved the first time they
logged in. If they login 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 recieves the same PID. The
hosts can select their ALPA and the switch provides the same value, if it’s 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 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. 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 fabric and the Brocade 8000.
To configure Persistent ALPA, perform the following steps.
1. Select Switch > Switch Admin > Switch tab.
2. Select the enable radio option of Persistent ALPA.