Users Guide

Fabric OS Administrator’s Guide 149
53-1002920-02
Credit loss
5
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” 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” 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:
• Per-port polling to detect credit loss. If credit loss is detected using this method, the
RASlog C3-1012 message is displayed and recorded.
• Per-VC credit loss detection. If single-credit loss is detected using this method, it will be
automatically recovered and the RASlog C3-1023 message is displayed and recorded.
If multi-credit loss is detected using this method, the RASlog C3-1013 message is displayed
and recorded. There is no automatic recovery for multi-credit loss.
• Complete VC credit loss detection. If credit loss is detected using this method, the
RASlog C3-1011 message is displayed and recorded.