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Chapter 5
Troubleshooting
Table 5-2
System-Wide Problems (continued)
Symptom
A trunk or subtending port
fails to come up
(E1 IMA).
OL-2365-01
Steps to Take
Before checking IMA interface problems, troubleshoot the E1 links that are configured in
1.
the IMA group, as described in the previous section. Verify that the links are up.
Check an IMA interface status with the show ima interface atm0/imaX command, where
2.
X is the IMA interface ID (0 through 3). Look at the following items in the resulting display:
MinNumLinks (minimum number of links) should be equal to or below the number of
–
links you have configured in your IMA group. You can change the minimum number of
links parameter in the IMA group to any value from 1 to 8.
–
NeTxClkMode (near end transmit clock mode) should match the FeTxClkMode (far
end transmit clock mode), which will be either ctc or itc. Both sides of the IMA link
must use the same IMA clock mode.
DiffDelayMaxObs (maximum observed differential delay) should be less than
–
DiffDelayMax (maximum differential delay configured for the group). If the
differential delay observed is more than the maximum allowed, one or more links is not
allowed in the IMA group. Configure more allowable differential delay (up to 69 ms in
T1, 55 ms in E1) using T1/E1 lines with less differential delay, or reconfigure
similarly-delayed lines into IMA groups if possible.
The IMA Link Information table shows the interfaces configured in your IMA group,
–
the near end and far end receive state, and any IMA alarms received at the near end. The
NeRxState and FeRxState must both be active for each line to be active in the IMA
group. The whole IMA group is up when the number of active links on both sides is
equal to or greater than the minimum number of configured links (MinNumLinks) for
that IMA group.
3.
It can take several seconds for an IMA group to synchronize between two IMA systems.
Wait 5 minutes after configuring or reconfiguring a group to allow the synchronization
to occur.
If synchronization does not occur in any one link or in the group after several minutes, or
4.
links cannot be successfully added to an active group, and the above IMA parameters have
been checked and are found to be correct, clear the interface with a clear interface
atm0/imaX command. This resets the IMA group and starts the IMA synchronization
process again with all links in the group.
5.
To check the interface status and configuration, enter show interface atm slot#/imagroup#.
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 atm0/ima2 with your slot/port ID:
DSLAM> configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
DSLAM(config-if)# int atm0/ima2
DSLAM(config-if)# no shutdown
DSLAM(config-if)#
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.
In interface configuration mode, reset the port by executing the shutdown command
6.
followed by the no shutdown command.
System-Wide Problems
Cisco 6260 Hardware Installation Guide
5-7
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