Nortel 5510 - Nortel Ethernet Routing Switch 5500 Series; NN47200-505 03.01 Standard

74 Chapter 2 System Diagnostics and Statistics
Step Action
1
Remove the unit you want to test from the stack.
2
Disconnect the stacking cables and any active cables connected
to the ports on the unit.
3
Go to NNCLI via serial interface.
4
Enable action mode.
enable
5
Run the internal loopback test.
stack loopback-test internal
6
Check the results of the command. The "stack loopback-test inter nal
output" (page 74) table shows the output from a pass and from a
failure.
stack loopback-test internal output
Pass Fail
Testing uplink port … ok
Testing downlink port … ok
Internal loopback test PASSED
Testing uplink port … Failed
Testing downlink port … ok
Internal loopback test FAILED
—End—
Testing the stack cables
Verify the integrity of the stack cables using the external loopback test.
Prerequisites for testing stack cables
• The internal loopback test passed. See "Testing the stack ports" (page
73).
•
Any previous tests have finished running.
Step Action
1
Remove the suspect unit from the stack.
2
Power up the suspect unit.
3
Connect a stacking cable from the stack uplink port to the stack
downlink port.
Nortel Ethernet Routing Switch 5500 Series
Configuration - System Monitor ing
NN47200-505 03.01 Standard
5.1 27 August 2007
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