Aps Line Does Not Seem To Switch And Active Line Is In Alarm; Bxm Backcard Led Green And Yellow Indications - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 29 Troubleshooting

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.
2.
3.
Work Around: 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 we force a switch to it, traffic will be 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 affect 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).

BXM backcard LED green and yellow indications

Description: Prior to an APS switch the active card LED is green and the standby card LED is yellow.
After the APS switch, both LEDs are green
Explanation: The BXM backcard LED is meant to show whether the card is currently being used by at
this time. Green means that this card is in use. Yellow means that the card is not in use and could be
removed for service. If the standby line's card's LED is green it means that part of this card is being
used at this time. This could happen due to the APS 1+1 cross over circuit where the working line's
front card is active but the protection line itself is active. The working line's backcard is being used to
shunt traffic to the protection line's backcard.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Verify that the configuration is correct (dspapsln, cnfapsln). See preceding configuration
problems.
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 then 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.
Verify the sequence of events by using dsplog and tracing the entries which 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 there will be a message such as "Cannot do APS SigFail switch from LN 1 to
LN 2".
Cisco BPX 8600 Series Installation and Configuration
Operational Problems
29-15