Unable To Perform Aps External Switch After Forced Or Manual Aps Switch; Aps Manual Switch To A Line Does Not Occur Right Away; Switch Occurs After Lockout Issued - Cisco BPX 8620 Installation And Configuration Manual

Operational Problems
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Unable to Perform APS External Switch After Forced or Manual APS Switch

Description: After performing a forced switch from the working line to the protection line (switchapsln
Ln1 Ln2 3) and then another forced switch back to working line (switchapsln Ln1 Ln2 4), when the user
again tries to perform a forced switch to the protection line, nothing happens.
Investigation: Once a forced switch is made from the working line to the protection line and back again,
a clear switch (switchapsln Ln1 Ln2 1) must be issued in order to perform another forced switch. This
applies to APS manual and lockout switching also.
With APS 1+1, when repetitive switchapsln commands are issued, up to two in a row can be executed
sequentially, when alternating between options 3 and 4 (forced switch), or 5 and 6 (manual switch), but
no more. Attempts to execute a third switchapsnln will not succeed, and the following error message is
displayed:
"Cannot request manual W->P when manual P->W switch in progress"
If users desire to perform repetitive switchapls commands, they need to issue a clear switch between
each W-P, P-W pair of commands, for example:
switchapsln 2.1

APS Manual Switch to a Line Does Not Occur Right Away

Description: After issuing a manual switch either to working or protection line, the switch did not occur
because the destination line was in alarm. When the alarm is cleared on that line the switch does occur.
Explanation: The BXM firmware remembers the "last user switch request" (also called external
request) and tries to switch to that line when it becomes available.

Switch Occurs After Lockout Issued

Description: With protection line active, the user issues an APS switch lockout and a switch occurs back
to the working line.
Investigation: This is normal operation. When the protection line is active and an APS switch lockout
is issued, a switch to the working line will happen. The lockout function locks the working line as active.
Only an external (user-requested) APS clear switch (switchapsln Ln1 Ln2 1) will disable the lockout.
Cisco BPX 8600 Series Installation and Configuration
28-12
Reverse Request—Specifies a state request switch due to the other end of an APS bidirectional line
performing an APS switch.
Do Not Revert—Specifies a state request due to the external user request being cleared, such as a
forced switch while using nonrevertive switching.
No Request—Specifies a state request due to the external user request being cleared, such as a forced
switch while using revertive switching.
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Chapter 28
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Troubleshooting