Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 132)

• 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.
The following credit loss recovery methods are supported for Brocade 6520 back-end ports:
• For all the credit loss methods described previously, 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.
• 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 C3-1014 message is displayed and
recorded.
Enabling back-end credit loss detection and recovery
Credit loss detection and recovery is enabled and disabled through the CLI using the
creditRecovMode --cfg command.
• The execution of this command is subject to Virtual Fabrics or Admin Domain restrictions that may
be in place. Refer to the Fabric OS Troubleshooting and Diagnostics Guide for more information.
• The bottleneck detection commands are supported on F_Ports, FL_Ports, E_Ports, and EX_Ports.
• The credit recovery commands are supported only on back-end ports of 4 Gbps-, 8 Gbps-, and 16
Gbps-capable FC platforms for blades in the Brocade DCX, DCX-4S, DCX 8510-8, and DCX
8510-4 chassis.
To enable back-end credit loss detection and recovery, perform the following steps.
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the creditRecovMode --cfg command to enable credit recovery of back-end ports. In the
following example, back-end port credit loss recovery is enabled with the link reset only option.
switch:admin> creditrecovmode--cfg onLrOnly
3. Enter the creditRecovMode --show command to display information about the back-end port
credit recovery configuration. In the following example, back-end port credit loss recovery is
enabled with the link reset only option.
switch:admin> creditrecovmode --show
Internal port credit recovery is Enabled with LrOnly
C2 FE Complete Credit Loss Detection is Enabled
Enabling back-end credit loss detection and recovery
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