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C-12
Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Appendix C Overload Control
Troubleshooting
Miscellaneous Measurements
lists additional measurements added to support Overload Control.
Troubleshooting
This section lists the
added to support this feature.
Events and Alarms
The FS sends an alarm when:
•
MCL changes
•
An individual critical factor reaches its threshold
The CA sends an Informational alarm when:
•
It receives a congested notification
•
It receives an abatement notification from an FS
Informational alarms are sent at fixed 25 percent increments. A configurable parameter,
info_alarm_step_size, is added to each factor defined in olm.cfg. Ensure the value allows sufficient
warning. The default for info_alarm_step_size is 5, giving factor informational alarms at 5, 10, 15
percent, etc.
Congestion Status—Maintenance (112)
The Congestion Status alarm (major) shows MCL changes, “System MCL Level”. This is the effective
MCL or the greater of the computed MCL and the administrative MCL.
When a new MAINTENANCE(112) alarm appears, old MAINTENANCE(112) alarms clear. When the
system MCL falls to 0, the “new” alarm clears.
Dampen this alarm using alarm_damping_time in olm.cfg. The value of alarm_damping_time is the
minimum amount of time that passes before the alarm is issued after the change occurred.
For additional information, refer to the
“MAINTENANCE (112)” section on page 7-60
Table C-7
Miscellaneous Measurements used by Overload Control
Timer
Description
ISUP_CONG_CALL_REJECTED
The congestion-rejected calls on a per trunk group basis. This
is implemented for SGA.
POTS_OC_DP_RECEIVED
The number of Detection Points (DPs) reported during
periods of congestion. This is being pegged by the FS
H323_OC_SETUP_REJECTED
The total number of incoming H.225 Setup messages rejected
by the BTS due to overload.
MEAS_ISA_OC_SETUP_REJECTED
The number of ISDN calls rejected due to system overload.
MEAS_MGA_OC_CALL_REJECTED
The number of MGCP calls rejected due to system overload.