Deployment Guide

The following example disables buffer credit recovery on port 1/20.
switch:admin> portcfgcreditrecovery 1/20 -disable
2. To enable buffer credit recovery on a port for which it has been disabled, perform the following steps.
a) Connect to the switch and log in using an account assigned to the admin role.
b) Enter the portCfgCreditRecovery command and include the enable option.
The following example enables buffer credit recovery on port 1/20.
switch:admin > portcfgcreditrecovery 1/20 -enable
Credit loss
Fabric OS v7.1 and later supports back-end credit loss detection, back-end ports and core blades, and
the Brocade 5300 and 6520 switches, although the support is slightly different on each device. Refer to
the following details on these switches, and the Fabric OS Troubleshooting and Diagnostics Guide for
more general information.
Back-end credit loss detection and recovery support on Brocade 5300
switches
The following credit loss detection methods are supported for Brocade 5300 back-end ports:
• Per-port polling to detect credit loss. If credit loss is detected using this method, the RASlog C2-1012
message is displayed and recorded.
• On-demand VC credit loss detection. If credit loss is detected using this method, the RASlog
C2-1027 message is displayed and recorded.
• TX timeout trigger automatic VC credit loss detection. If credit loss is detected using this method, the
RASlog C2-1027 message is displayed and recorded.
The following credit loss recovery methods are supported for Brocade 5300 back-end ports:
• For per-port polling and on-demand VC credit loss methods, a link reset will automatically be
performed, assuming that this option was enabled. Refer to Enabling back-end credit loss detection
and recovery on page 132 for details on enabling this feature.
• For the TX timeout trigger automatic VC method, a link reset will be automatically performed if
complete credit loss on a VC is detected.
• A manual link reset option using the creditRecovMode command is also available. Refer to Enabling
back-end credit loss detection and recovery on page 132 for instructions.
NOTE
Whenever a link reset is performed on this switch, the RASlog C2-1014 message is displayed and
recorded.
Back-end credit loss detection and recovery support on Brocade 6520
switches
The following credit loss detection methods are supported for Brocade 6520 back-end ports:
Credit loss
Fabric OS Administrators Guide 131
53-1003130-01