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68-7
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 68 Monitoring System Processes and Logs
Default Settings
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 68-1 lists the default system health and log settings.
Ta b l e 68-1 Default System Health and Log Settings
Parameters Default
Kernel core generation One module.
System health Enabled.
Loopback frequency 5 seconds.
Failure action Enabled.
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