Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
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Chapter 3 Cisco IGX 8400 Series Nodes
Troubleshooting
User-Initiated Tests
Several user commands help you test the node status. The switch software CLI commands are:
• tstcon
• tstport for data and Frame Relay ports
For details on these commands, see the Cisco WAN Switching Command Reference.
Loopback Tests
Loopback tests are available to help diagnose the state of the IGX system. The CLI commands for
activating these tests are:
• addloclp, addrmtlp
• Frame Relay ports: addloclp
For detailed information on these commands, see the Cisco WAN Switching Command Reference.
Card Testing with External Test Equipment
The HDM/SDI or LDM/LDI card set can be tested as a pair at the local node using external test
equipment such as a Bit Error Rate Tester (BERT). This can be useful in isolating dribbling error rates
in either the cards or the transmission facility. This test checks the data path from the electrical interface
at the port through the card set to the Cellbus in both directions of transmission.
Note This is a disruptive test. Notify your network administrator before performing this test.
To perform this test, proceed as follows:
Step 1 Disconnect the cable connection to the SDI or LDI and connect the BERT in its place.
Step 2 Set up an internal loopback on the Frame Relay port to be tested using the addloclp command.
Step 3 Turn on the BERT, make sure it indicates circuit continuity, and observe the indicated error rate.
Step 4 If there are any errors indicated, first replace the back card and retest. If the errors remain, then replace
the front card and retest.
Step 5 When the test is complete, disconnect the BERT and reconnect the data cable. Release the local loopback
by using the dellp command.
Step 6 Repeat at the node at the other end of the connection if necessary.