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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 28 Troubleshooting
Operational Problems
APS Switch Occurs After Issuing an APS Clear Switch
Description:
User issues an APS clear switch (
switchapsln
Ln1 Ln2 1) command while protection line
is active and a switch occurs to the working line.
Explanation:
This is normal operation. An APS clear switch request causes the APS switching
mechanism in the BXM to initialize. This will cause a switch back to the working line if the working
line is in better shape than the protection line. If the protection line is not faulty, no switch will occur.
APS Switch Occurs Even Though APS Forced Switch in Effect
Description:
A forced switch to protection line is performed. LOS on protection line causes a switch
back to working line even though a forced switch is in progress.
Explanation:
Signal Fail on Protection line has higher priority than Forced switch. Whenever the
protection line is in failure, there is a switch to working line, even if the working line is failed or there
is a forced W->P in affect.
APS Line is Failing to Switch
Description:
The user issues an APS forced or manual switch request but no switch occurs.
Investigation:
This could be due to a forced, manual, or lockout switch being in progress and a clear
switch is required (
switchapsln
Ln1 Ln2 1). Need to issue an APS clear switch (
switchapsln
) to exit
forced, manual, or lockout switch state.
If running the ITUT APS standard protocol, which does not report an Architecture Mismatch APS alarm,
the problem could be that one end of the line is bidirectional and the other is unidirectional.
Check that configuration is the same on both ends, specifically uni/bidirectional mode, 1:1/1+1
configuration.
A manual switch will not occur if the standby line is in alarm.
Large Cell Loss When Performing a Front Card Switchover
Description:
A line configured for APS 1+1 line redundancy has its active front card switched either
due to card failure,
switchyred
(
switchcdred
), or resetting the card. A loss of cells is observed.
Investigation:
Cell loss at card switchover is not due to faulty APS. It is a result of the card redundant
switch (Y-red switch) and there are up to 250 ms worth of traffic disruption during BXM front card
switchovers.
APS Service Switch Description
Description:
What is an APS service switch? Does it work on APS 1:1 configurations?
Investigation:
An APS service switch is applicable only to APS 1+1 configuration. It enables switching
all APS lines on a card by using a single
switchapsln
command with an “s” option at the end of the
command. All APS lines on this card pair are switched and made active on a single back card, allowing
the other back card to be removed for service.
Содержание BPX 8650
Страница 49: ...P A R T 1 The BPX Switch ...
Страница 50: ......
Страница 159: ...P A R T 2 Installation ...
Страница 160: ......
Страница 273: ...P A R T 3 Initial Configuration and Network Management ...
Страница 274: ......
Страница 311: ...P A R T 4 Configuring Connections ...
Страница 312: ......
Страница 487: ...P A R T 5 Troubleshooting and Maintenance ...
Страница 488: ......
Страница 533: ...P A R T 6 BPX Specifications ...
Страница 534: ......
Страница 555: ...P A R T 7 Appendices ...
Страница 556: ......