Nortel Ethernet Routing Switch 5500 Series; Nn47200-505 03.01 Standard - Nortel 5510 Configuration

74 Chapter 2 System Diagnostics and Statistics
Step
1
2
3
4
5
6
stack loopback-test internal output
Pass
Testing uplink port ... ok
Testing downlink port ... ok
Internal loopback test PASSED
Testing the stack cables
Verify the integrity of the stack cables using the external loopback test.
Prerequisites for testing stack cables
•
•
Step
1
2
3
Copyright © 2005 - 2007, Nortel Networks
.
Action
Remove the unit you want to test from the stack.
Disconnect the stacking cables and any active cables connected
to the ports on the unit.
Go to NNCLI via serial interface.
Enable action mode.
enable
Run the internal loopback test.
stack loopback-test internal
Check the results of the command. The
output" (page 74)
failure.
The internal loopback test passed. See
73).
Any previous tests have finished running.
Action
Remove the suspect unit from the stack.
Power up the suspect unit.
Connect a stacking cable from the stack uplink port to the stack
downlink port.

Nortel Ethernet Routing Switch 5500 Series

Configuration - System Monitoring

NN47200-505 03.01 Standard

5.1 27 August 2007
table shows the output from a pass and from a
Fail
Testing uplink port ... Failed
Testing downlink port ... ok
Internal loopback test FAILED
—End—
"Testing the stack ports" (page
"stack loopback-test internal