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Beta Draft Confidential
10-6
1/19/05
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring ATM PVCs
VC Overload Control
VC Overload Control
The VC Overload Control feature detects overload conditions and allows application
load to be shed during high CPU utilization. Overload control prevents the sustained
level of CPU utilization from exceeding 90% by directing switch applications to shed
new service requests.
A CPU utilization rate of 90% provides administrative controls and diagnostic
software with a sufficient amount of real-time bandwidth to maintain the integrity of
the software.
In addition, when the VC Overload Control feature is enabled, it affects system
performance in the following ways:
•
Number of successful completions during extended periods of high SVC setup
and tear down requests increases up to 70%.
•
PVC reroute rates are greater than the current fixed maximum rate up to the point
that the CPU utilization rate reaches 90% or the reroute success rate is below 90%.
•
Maximum SVC setup and setup/tear down rates are approximately 10-15% lower.
VC Overload Control is supported for PVC, SVC, and SPVC processing.
You enable VC Overload Control on the Modify Switch dialog box. For more
information on this dialog box and instructions for enabling VC Overload Control, see
chapter 4 of the Navis EMS-CBGX Getting Started Guide.
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