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21-99
Cisco MDS 9000 Family Command Reference
OL-16217-01, Cisco MDS SAN-OS Release 3.x
Chapter 21 S Commands
system health external-loopback
Usage Guidelines Use this command to run this test on demand for the external devices connected to a switch that are part
of a long haul network.
Examples The following example displays an external loopback command for a Fibre Channel interface.
switch# system health external-loopback interface fc 3/1
This will shut the requested interfaces Do you want to continue (y/n)? [n] y
External loopback test on interface fc3/1 was successful.
The following example displays the effect of the force option when implementing a forced loopback.
switch# system health external-loopback interface fc 3/1 force
External loopback test on interface fc3/1 was successful.
Related Commands Command Description
system health Configures Online Health Management System (OHMS) features for a
specified interface or for the entire switch.
system health
internal-loopback
Explicitly runs an internal OHMS loopback test on demand for a specified
interface or module.
system health
serdes-loopback
Explicitly runs an internal OHMS Serializer/Deserializer (Serdes) loopback
test on demand for a Fibre Channel interface.
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