Congestion Control; Bulk Statistics - Cisco ASR 5000 Series Administration Manual

▀ Features and Functionality

Congestion Control

The congestion control feature allows you to set policies and thresholds and specify how the system reacts when faced
with a heavy load condition.
The congestion control feature monitors the system for conditions that could potentially degrade performance when the
system is under heavy load. Typically, these conditions are temporary (for example, high CPU or memory utilization)
and are resolved quickly. However, continuous or large numbers of these conditions within a specific time interval may
have an impact on the system's ability to service subscriber sessions. Congestion control helps identify such conditions
and invokes policies for addressing the situation.
Congestion control operation is based on configuring the following:
• Congestion Condition Thresholds: Thresholds dictate the conditions for which congestion control is enabled
and establishes limits for defining the state of the system (congested or clear). These thresholds function in a
way similar to operation thresholds that are configured for the system as described in the Thresholding
Configuration Guide. The primary difference is that when congestion thresholds are reached, a service
congestion policy and an SNMP trap, starCongestion, are generated. A threshold tolerance dictates the
percentage under the configured threshold that must be reached in order for the condition to be cleared. An
SNMP trap, starCongestionClear, is then triggered.
• Port Utilization Thresholds: If you set a port utilization threshold, when the average utilization of all ports in
the system reaches the specified threshold, congestion control is enabled.
• Port-specific Thresholds: If you set port-specific thresholds, when any individual port-specific threshold is
reached, congestion control is enabled system-wide.
• Service Congestion Policies: Congestion policies are configurable for each service. These policies dictate how
services respond when the system detects that a congestion condition threshold has been crossed.
Important:

Bulk Statistics

Bulk statistics allow operators to choose to view not only statistics that are of importance to them, but to also configure
the format in which they are presented. This simplifies the post-processing of statistical data since it can be formatted to
be parsed by external, back-end processors.
When used in conjunction with the Web Element Manager, the data can be parsed, archived, and graphed.
The system can be configured to collect bulk statistics and send them to a collection server called a receiver. Bulk
statistics are statistics that are collected in a group. The individual statistics are grouped by schema. The following is a
partial list of supported schemas:
• System: Provides system-level statistics.
• Card: Provides card-level statistics.
• Port: Provides port-level statistics.
• FNG: Provides FNG service statistics.
▄ Cisco ASR 5000 Series Femto Network Gateway Administration Guide
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For more information on congestion control, refer to the System Administration Guide.
Femto Network Gateway Overview
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