Operational Problems; Initial Investigation Of Aps Switch Operations - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 29 Troubleshooting
APS 1:1
Mode Revertive
Bi- Default
directional
Uni- Not Valid
directional
Once the APS configuration 1+1, 1:1, 1+1 Annex B, or 1+1 ignore K1 is chosen by the addapsln, it
cannot be changed except by deleting the APS line (delapsln) and re-adding the APS line with the new
configuration (addapsln).

Operational Problems

This section describe possible APS operational problems and troubleshooting techniques for each.

Initial Investigation of APS Switch Operations

There are ten reasons an APS switch may occur. You can view these logged reasons by using the dsplog
command. When the BXM switches an APS line it returns an event message to the SWSW with the
reason why it switched and which line is active.
This list shows the possible conditions which may cause/prevent a switch. The list is arranged starting
from highest precedence and ending with lowest precedence.
1.
2.
3.
4.
5.
6.
7.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
APS 1+1, 1+1 ignore K1
Non-revertive Revertive
Not Valid Valid option
Not Valid Valid option
Lock out of Protection
An external user requested switch which prevents switching from working line to protection line
from taking place.
Forced Switch
An external user requested switch which forces a switch from working line to protection line or
vice-versa even if there is an alarm on the destination line.
Signal Fail
An automatically initiated switch due to a signal failure condition on the incoming OC-N line
including loss of signal, loss of frame, AIS-L defects, and a line BER exceeding 10-3.
Signal Degrade
An automatically initiated switch due to a "soft failure" condition resulting from the line BER
exceeding a pre-selected threshold (cnfapsln).
Manual Switch
An external user requested switch which requests a switch from working line to protection line or
vice-versa but only if there is no alarm on the destination line.
Wait To Restore
A state request switch due to the a revertive switch back to the working line because the
wait-to-restore timer has expired.
Exercise
Not supported
APS 1+1 Annex B
Non-revertive Revertive
Valid option Not Valid
Default Not Valid
Cisco BPX 8600 Series Installation and Configuration
Operational Problems
Non-revertive
Default
Not Valid
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