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Cisco 4700 Series Application Control Engine Appliance Administration Guide
OL-11157-01
Chapter 4 Configuring Class Maps and Policy Maps
Class Map and Policy Map Overview
Class Maps
The
class-map
command defines each Layer 3 and Layer 4 traffic class and each
Layer 7 protocol class. You create class maps to classify the traffic received and
transmitted by the ACE.
•
Layer 3 and Layer 4 traffic classes contain match criteria that identify the IP
network traffic that can pass through the ACE or network management traffic
that can be received by the ACE.
•
Layer 7 protocol-specific classes identify server load balancing based on
HTTP traffic, deep inspection of HTTP traffic, or the inspection of FTP
commands by the ACE.
A traffic class contains the following components:
•
Class map name
•
One or more
match
commands that define the match criteria for the class map
•
Instructions on how the ACE evaluates
match
commands when you specify
more than one
match
command in a traffic class (
match-any
,
match-all
)
The ACE supports a system-wide maximum of 8192 class maps.
The individual
match
commands specify the criteria for classifying Layer 3 and
Layer 4 network traffic as well as the Layer 7 HTTP server load balancing and
application protocol-specific fields. The ACE evaluates the packets to determine
whether they match the specified criteria. If a statement matches, the ACE
considers that packet to be a member of the class and forwards the packet
according to the specifications set in the traffic policy. Packets that fail to meet
any of the matching criteria are classified as members of the default traffic class
if one is specified.
