Installation guide

4-8
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 4 Troubleshooting the IGX
Troubleshooting an IGX Node
Troubleshooting Failed Trunks
Step 1 Use the dsptrks command to identify the remote end node name, trunk numbers at each end, and the
type of failure.
a. If the display shows a communication failure, go to the “Troubleshooting Communication Failure
and CGAs” section on page 4-8.
b. If the display shows a local CGA, go to the “Troubleshooting Communication Failure and CGAs”
section on page 4-8.
c. If the display shows a remote CGA, go to the “Troubleshooting Communication Failure and CGAs”
section on page 4-8.
d. If the display shows a bipolar error, go to the “Troubleshooting Bipolar Errors, Frame Slip Errors,
and Out-of-Frame Errors” section on page 4-9.
e. If the display shows a frame slip error, go to the “Troubleshooting Bipolar Errors, Frame Slip Errors,
and Out-of-Frame Errors” section on page 4-9.
f. If the display shows an out-of-frame error, go to the “Troubleshooting Bipolar Errors, Frame Slip
Errors, and Out-of-Frame Errors” section on page 4-9.
g. If the display shows a time-stamped packet drop error, go to the “Troubleshooting Packet Drops”
section on page 4-9.
h. If the display shows a non-time-stamped packet drop error, go to the “Troubleshooting Packet
Drops” section on page 4-9.
i. If the display shows a loopback, go to the “Troubleshooting a Loopback” section on page 4-9.
Troubleshooting Communication Failure and CGAs
A Local CGA indicates no pulses at the local end of the trunk; a remote CGA indicates no pulses at the
remote end of the trunk.
Step 1 Use the dsplog command to determine when the communication failure or CGA occurred, and identify
connections that might have failed because of lack of bandwidth on an alternate route.
Step 2 Use the dsptrkerrs command at each end of the packet line to quantify errors, and determine if they are
unidirectional or bidirectional.
Step 3 Call telephone carrier and request span testing. Ask the carrier to perform BER tests using multiple test
patterns, including standard quasi, all 1, and 3 and 24 patterns.
Step 4 Make a note of the steps taken, and contact the Cisco TAC. For more information, refer to the “Obtaining
Technical Assistance” section on page xxiii.