Performing Internal Loopback Tests - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 59 Monitoring System Processes and Logs
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Use the EXEC-level system health clear-errors command at the interface or module level to erase any
previous error conditions logged by the system health application. The battery-charger, the bootflash,
the cache-disk, the eobc, the inband, the loopback, and the mgmt test options can be individually
specified for a given module.
The following example clears the error history for the specified Fibre Channel interface:
switch# system health clear-errors interface fc 3/1
The following example clears the error history for the specified module:
switch# system health clear-errors module 3
The following example clears the management test error history for the specified module:
switch# system health clear-errors module 1 mgmt

Performing Internal Loopback Tests

You can run manual loopback tests to identify hardware errors in the data path in the switching or
services modules, and the control path in the supervisor modules. Internal loopback tests send and
receive FC2 frames to/from the same ports and provide the round trip time taken in microseconds. These
tests are available for Fibre Channel, IPS, and iSCSI interfaces.
Use the EXEC-level system health internal-loopback command to explicitly run this test on demand
(when requested by the user) within ports for the entire module.
switch# system health internal-loopback interface iscsi 8/1
Internal loopback test on interface iscsi8/1 was
Sent 1 received 1 frames
Round trip time taken is 79 useconds
Use the EXEC-level system health internal-loopback command to explicitly run this test on demand
(when requested by the user) within ports for the entire module and override the frame count configured
on the switch.
switch# system health internal-loopback interface iscsi 8/1 frame-count 20
Internal loopback test on interface iscsi8/1 was
Sent 1 received 1 frames
Round trip time taken is 79 useconds
Use the EXEC-level system health internal-loopback command to explicitly run this test on demand
(when requested by the user) within ports for the entire module and override the frame length configured
on the switch.
switch# system health internal-loopback interface iscsi 8/1 frame-count 32
Internal loopback test on interface iscsi8/1 was
Sent 1 received 1 frames
Round trip time taken is 79 useconds
If the test fails to complete successfully, the software analyzes the failure and prints the following error:
Note
External loopback test on interface fc 7/2 failed. Failure reason: Failed to loopback,
analysis complete Failed device ID 3 on module 1
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Online System Health Management
successful.
successful.
successful.
Cisco MDS 9000 Family CLI Configuration Guide
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