Performing Internal Loopback Tests; Performing External Loopback Tests - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Chapter 70 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
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Each module is configured to run the test relevant to that module. You can change the default parameters
of the test in each module as required.

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.
Choose Interface > Diagnostics > Internal to perform an internal loopback test from Device Manager.

Performing External 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. External loopback tests send and
receive FC2 frames to/from the same port or between two ports.
You need to connect a cable (or a plug) to loop the Rx port to the Tx port before running the test. If you
are testing to/from the same port, you need a special loop cable. If you are testing to/from different ports,
you can use a regular cable. This test is only available for Fibre Channel interfaces.
Choose Interface > Diagnostics > External to perform an external loopback test from Device Manager.
Default Settings
Table 70-1
Table 70-1
Parameters
Kernel core generation
System health
Loopback frequency
Failure action
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Sends Call Home and system messages and exception logs as soon as it detects a failure.
Shuts down the failing module or component (such as an interface).
Isolates failed ports from further testing.
Reports the failure to the appropriate software component.
Switches to the standby supervisor module, if an error is detected on the active supervisor module
and a standby supervisor module exists in the Cisco MDS switch. After the switchover, the new
active supervisor module restarts the active supervisor tests.
Reloads the switch if a standby supervisor module does not exist in the switch.
Provides CLI support to view, test, and obtain test run statistics or change the system health test
configuration on the switch.
Performs tests to focus on the problem area.
lists the default system health and log settings.
Default System Health and Log Settings
Default
One module.
Enabled.
5 seconds.
Enabled.
Cisco MDS 9000 Family CLI Configuration Guide
Default Settings
70-7