Removing Aps Redundancy Between Two Lines; Troubleshooting Aps Lines - Cisco MGX 8850 (PXM1E/PXM45) Configuration Manual

Managing Redundant APS Lines

Removing APS Redundancy Between Two Lines

To remove the redundant APS line relationship between two lines, enter the delapsln command as
described in the following procedure.
Establish a configuration session using a user name with GROUP1_GP privileges or higher.
Step 1
To remove redundancy between the two lines, enter the following command after the switch prompt:
Step 2
mgx8830a.1.PXM.a > delapsln <workingIndex>
Select the working line to delete by replacing <workingIndex> with the location of the working line
using the format slot.bay.line. In the following example, the delapsln command removes the APS
redundancy between the working line at Card 1, Bay 2, Line 1 and the protection line associated with it.
mgx8830a.1.PXM.a > delapsln 1.2.1

Troubleshooting APS Lines

Port lights on PXM1E, SRM, AXSME, and AXSM-XG front cards indicate the receive status of APS
lines. The active front card always displays the status of the active line. The standby card always displays
the status of the inactive line. If only one APS line fails, the line failure LED is always displayed on the
standby front card.
When the active front card and the active line are in different slots and the inactive line has failed, it is
Caution
easy to incorrectly identify the failed line as the line in the standby slot. To avoid disrupting traffic
through the active line, verify which physical line is at fault before disconnecting the suspect line.
If the active line fails and the standby line is not available, the switch reports a critical alarm.
If the active line fails and the standby line takes over, the former standby line becomes the new active
line, and the switch reports a major alarm.
If a PXM1E, SRM, AXSME, or AXSM-XG front card fails, APS communication between the redundant
front cards fails. This can result in one of the following situations:
•
•
Use the following procedure to troubleshoot APS lines.
Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
9-26
If both APS lines were working before the failure, an APS line failure causes a switchover to the
protection line
If either APS line failed prior to a front card failure, a failure on the active line does not cause a
switchover to the other line. Because the standby front card failed, it cannot monitor the standby line
and report when the line has recovered. This means that the active card cannot use the standby line
until the standby front card is replaced and the line problem corrected.
Chapter 9 Switch Operating Procedures
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004