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Chapter 28
Troubleshooting
Operator Information about APS Architectures
Description: The cnfapsln user interface command does not let you configure any combination of APS
architectures.
Initial Investigation: You can change the APS configuration by using the cnfapsln command; however,
not all combinations are allowed. Here is a table of combinations allowed and disallowed.
APS 1:1
Mode
Revertive
Bidirectional
Default
Unidirectional
Not Valid
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 readding 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 might 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 that might 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 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
non-Revertive
Not Valid
Not Valid
Lock Out of Protection—Specifies an external user-requested switch that prevents switching from
working line to protection line from taking place.
Forced Switch—Specifies an external user-requested switch that forces a switch from working line
to protection line or vice versa even if there is an alarm on the destination line.
Signal Fail—Specifies 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—Specifies an automatically initiated switch due to a "soft failure" condition
resulting from the line BER exceeding a preselected threshold (cnfapsln command).
Manual Switch—Specifies an external user requested switch that 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—Specifies a state request switch due to a revertive switch back to the working line
because the Wait-to-Restore timer has expired.
Exercise—Specifies that this condition is not supported.
APS 1+1, 1+1 ignore K1
Revertive
non-Revertive
Valid option
Valid option
Valid option
Default
Cisco BPX 8600 Series Installation and Configuration
Operational Problems
APS 1+1 Annex B
Revertive
non-Revertive
Not Valid
Default
Not Valid
Not Valid
28-11
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Table of Contents
Troubleshooting
