Creating A Regular Expression Class Map; Defining Actions (Layer 3/4 Policy Map) - Cisco 7604 Configuration Manual

Defining Actions (Layer 3/4 Policy Map)

Creating a Regular Expression Class Map

A regular expression class map identifies one or more regular expressions. You can use a regular
expression class map to match the content of certain traffic; for example, you can match URL strings
inside HTTP packets.
The maximum number of class maps ( Layer 3/4, inspection, and regular expression) is 255 in single
mode or per context in multiple mode. This limit includes default class maps. See the
Maps" section on page
To create a regular expression class map, perform the following steps:
Step 1 Create one or more regular expressions according to the
Step 2 Create a class map by entering the following command:
hostname(config)# class-map type regex match-any class_map_name
hostname(config-cmap)#
Where class_map_name is a string up to 40 characters in length. The name "class-default" is reserved.
All types of class maps use the same name space, so you cannot reuse a name already used by another
type of class map.
The match-any keyword specifies that the traffic matches the class map if it matches at least one of the
regular expressions.
The CLI enters class-map configuration mode.
(Optional) Add a description to the class map by entering the following command:
Step 3
hostname(config-cmap)# description string
Identify the regular expressions you want to include by entering the following command for each regular
Step 4
expression:
hostname(config-cmap)# match regex regex_name
The following example creates two regular expressions, and adds them to a regular expression class map.
Traffic matches the class map if it includes the string "example.com" or "example2.com."
hostname(config)# regex url_example example\.com
hostname(config)# regex url_example2 example2\.com
hostname(config)# class-map type regex match-any URLs
hostname(config-cmap)# match regex url_example
hostname(config-cmap)# match regex url_example2
Defining Actions (Layer 3/4 Policy Map)
This section describes how to associate actions with Layer 3/4 class maps by creating a Layer 3/4 policy
map. This section includes the following topics:
•
•
•
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
20-14
20-4.
Information About Layer 3/4 Policy Maps, page 20-15
Default Layer 3/4 Policy Map, page 20-18
Adding a Layer 3/4 Policy Map, page 20-18
Chapter 20 Using Modular Policy Framework
"Creating a Regular Expression"
"Default Class
section.
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