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How to perform Loopback Testing on ERS stackables

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TitleHow to perform Loopback Testing on ERS stackables
Objective
If there are issues with stack falling apart, switch leaves the stack intermittently with no apparent cause and from the logs, we do not see anything except switch left stack, we can perform loopback test to check stacking ports and cables.
Environment
ERS stackables
Procedure
There are two types of stack  loopback tests: internal loopback test and external loopback test. The purpose of the internal loopback test is to verify that the stack ports are functional in each switch. The purpose of the external loopback test is to verify that the stack cables are functional.

For accurate results, the internal loopback test must be run before the external loopback test. The stack loopback tests can only be performed on a standalone unit with no traffic running on the unit.
To run the test, first use the
#stack loopback-test internal command. To perform the external loopback test, connect the stack uplink port with the stack downlink port. Use the #stack loopback-test external command.

 
#stack loopback-test internal
#stack loopback-test external



 
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