Specifications

Chapter 10 Traffic Shaping
Class-Based Traffic Shaping
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Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Class-Based Traffic Shaping
Class-Based Traffic Shaping can be enabled on any interface that supports GTS.
How It Works
Using Class-Based Traffic Shaping, you can perform the following tasks:
• Configure GTS on a traffic class to provide greater flexibility for configuring
traffic shaping. Previously, this ability was limited to the use of ACLs.
• Specify average rate or peak rate traffic shaping. This type of shaping allows
more data than the CIR to be sent if the bandwidth is available.
• Configure class-based weighted fair queueing (CBWFQ) inside GTS.
CBWFQ allows you to specify the exact amount of bandwidth to allocate for
a specific class of traffic. You can configure up to 64 classes and control their
distribution.
Flow-based WFQ applies weights to traffic to classify the traffic into
conversations and determine how much bandwidth each conversation is
allowed. These weights and traffic classifications are dependent on and
limited to the seven IP Precedence levels.
CBWFQ allows you to define what constitutes a class based on criteria that
exceed the confines of flow. CBWFQ allows you to use ACLs and protocols
or input interface names to define how traffic will be classified, thereby
providing coarser granularity. You need not maintain traffic classification on
a flow basis. Moreover, you can configure up to 64 discrete classes in a
service policy.
Configuration and Commands
For information on how to configure Class-Based Shaping, see the chapter
“Configuring Class-Based Shaping” in the Cisco IOS Quality of Service Solutions
Configuration Guide, Release 12.2:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
_c/fqcprt4/qcfcbshp.htm#80464