Stack Loopback Testing; Stack Health Check; System Logs - Avaya Virtual Services Platform 7000 Series Troubleshooting Manual

Stack loopback testing

Stack loopback tests can help you determine whether the source of a stack problem is a defective
Fabric Interconnect (FI) cable or a damaged FI port.
There are two types of stack loopback tests. The internal loopback test verifies that the FI ports are
functional. The external loopback test checks if the FI cables are functional.
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.
Note:
Always perform the internal loopback test first, because the FI cable tests are not conclusive
until you ensure that the FI ports function correctly.
Important:
Always perform an external loopback test using only the top FI-ports. Using the bottom FI-ports
can result in a false pass.
For more information about stack loopback testing, see Configuring System Monitoring on Avaya
Virtual Services Platform 7000 Series, NN47202–505.

Stack health check

You can use the stack health check feature to run a high-level test to confirm stack operation and
stack continuity. Stack health check results provide you with information about the Fabric
Interconnect port status for each stack switch unit, the total number of switching units in the stack,
the number of stacking cables used, if a stack runs with a temporary base unit, and indicates which
stack switch unit is configured as base.
Use ACLI and EDM to display the stack health status.
Note:
Stack health check feature is not available for standalone switches.
For detailed information about stack health check, see Configuring System Monitoring on Avaya
Virtual Services Platform 7000 Series, NN47202–505.

System logs

The VSP 7000 Series supports system logging (syslog), a software tool to log system events for
debugging and analysis.
July 2015
Comments on this document? infodev@avaya.com
Stack loopback testing
Troubleshooting Avaya VSP 7000 Series
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