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System-Wide Problems
Table 5-2
System-Wide Problems (continued)
Symptom
A trunk or subtending port
fails to come up (E1).
Cisco 6260 Hardware Installation Guide
5-6
Steps to Take
Verify that the trunk port selection is correct.
1.
Check the cable connections at both ends. Refer to
2.
Specifications,"
to check pinouts.
To check the interface status and configuration, enter show interface atm slot#/port#.
3.
Check the following information in the resulting display:
If the port Admin Status is down, enter the commands below to correct the problem,
–
replacing slot/port ID atm 0/2 with your slot/port ID (atm 0/2 through atm 0/9):
DSLAM> configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
DSLAM(config-if)# int atm 0/2
DSLAM(config-if)# no shutdown
DSLAM(config-if)#
If the port IF Status is down, check for disconnected or faulty wire. T1/E1 twisted pair
–
wire connects to the I/O module on the front of the chassis.
If the Line Protocol is down, the line protocol software processes might have
–
determined that the line is unusable; try swapping the cable. Another possibility is that
clocking might be misconfigured, or the clocking source might have failed.
Check the CRC field. The presence of many CRC errors but not many collisions is an
–
indication of excessive noise. If the number is too high (greater than 0.5 to 2 percent of
total traffic on the interface), check the cables to determine if any are damaged.
If you need more information on interface configuration, refer to the Configuration Guide
for Cisco DSLAMs with NI-2 and the ATM Switch Router Software Configuration Guide.
Enter show controllers atm slot#/port#. Check the following information in the
4.
resulting display:
Framing mode must be the same at both ends of the connection.
–
–
Line coding must be the same at both ends of the connection (E1).
Cell payload scrambling must be on at both ends of the connection.
–
5.
Check the status and configuration of the interface at the far end.
If you need to run a loopback test to troubleshoot the E1 links, do the following tasks:
6.
–
In interface configuration mode, enter loopback diagnostic (or loopback line).
Set the external test equipment to loop data through the Cisco 6260 port.
–
Obtain loopback results from your external test equipment.
–
Enter no loopback diagnostic (or no loopback line) to take the port out of
–
loopback mode.
In interface configuration mode, reset the trunk port by executing the shutdown command
7.
followed by the no shutdown command.
Replace the NI-2 card.
8.
If the problem with a T1/E1 interface persists, troubleshoot the network I/O module. See the
9.
"I/O Module Problems" section on page
Appendix C, "Connector and Pinout
5-14.
Chapter 5
Troubleshooting
OL-2365-01
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