Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 28 Troubleshooting
Operational Problems
Important : Be sure that the associated front card is active for the back card that is to remain in the rack.
You might have to perform a switchcdred so that the back card that the service switch switches to has
its associated front card active. A service switch is not required in order to remove a BXM front card
with APS 1+1 lines on it. The card redundancy will handle the switch to the other card without affecting
the lines.
APS Line Does Not Seem to Switch and Active Line is in Alarm
Description: A major line alarm is indicated on the active line yet it remains active due to no APS switch
to the redundant line.
Initial Investigation
1. Verify that the configuration is correct ( dspapsln , cnfapsln ). See preceding configuration problems.
2.
Use dspapsln to check the APS line’s status. The dspapsln display shows the active and standby
line’s alarm status. It also shows if there are any APS alarms.
If the active line alarm status shows OK but the standby line alarm status shows an alarm, then a
switch will not occur due to the standby line alarm. Troubleshoot the standby line problem.
If the standby line alarm status shows OK but the active line alarm status shows an alarm then a
switch should have occurred and there is a more obscure problem.
If there is an APS alarm shown under Current APS alarms, this could be the problem (see section
on APS Alarms).
If APS 1+1 is configured, use dspcds to check the status of the protection line’s card. If there is a
problem with this card, a switch may not occur.
3. Verify the sequence of events by using dsplog and tracing the entries that contain information about
this line or APS on this line.
If a switch was attempted and succeeded due to a Loss of Signal, the message “APS SignalFail
switch from LN 1 to LN 2” should be logged.
If the switch failed, a message appears such as “Cannot do APS SigFail switch from LN 1 to LN 2”.
Workaround: Perform a clear switch on each end of the APS line ( switchapsln 2.1 1 ). This may get
both ends in sync and clear up the problem.
A forced switch from working to protection may be performed (example: switchapsln 2.1 3 ).
Warning If the protection line is in LOS and you force a switch to it, traffic is lost.
If the line is an APS 1+1 line, then the front cards are redundant and the user may try a switchcdred
( switchyred ) to induce APS switching. This should normally have no effect on APS switching. APS
switching and card redundancy switching are independent.
The BXM card may be reset in combination with an APS clear switch either before of after the reset at
both ends of the APS line. Perform an APS clear switch on both on both ends of the line. Reset the BXM
cards (
resetcd h ).