81-5
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 81 Configuring WCCP Version 2 Services
Restrictions for WCCP
Restrictions for WCCP
The following limitations apply to WCCP:
• Time To Live (TTL) value of Layer 3 switches servicing a cluster must be 15 seconds or less.
• A service group can comprise up to 32 content engines and 32 devices.
• All the content engines in a cluster must be configured to communicate with all the devices servicing
the cluster.
• A total of eight active IPv4 and IPv6 service groups are supported on a switch. If used in pairs, up
to four service-group pairs can be configured simultaneously.
• The Layer 2 rewrite forwarding method is supported in the hardware.
• The Layer 2 return method is supported in the hardware and is recommended.
• The content engine must be directly connected to the device.
• Input/output redirection configuration is not supported on content engines facing interfaces.
• WCCPv2 supports up to 256 distinct masks. However, a Catalyst 4500 series switch only supports
a single mask.
Configuring WCCP
The following configuration tasks assume that you have already installed and configured the content
engines you want to include in your network. You must configure the content engines in the cluster
before configuring WCCP on your device. Refer to the Cisco Content Engine User Guide for content
engine configuration and setup tasks.
IP must be configured on the device interface connected to the cache engines. Examples of device
configuration tasks follow this section. For complete descriptions of the command syntax, refer to the
Cisco IOS Configuration Fundamentals Command Reference, Cisco IOS Release 12.3.
These sections describe how to configure WCCP:
• Configuring a Service Group Using WCCP, page 81-5 (Required)
• Using Access Lists for a WCCP Service Group, page 81-8 (Optional)
• Setting a Password for a Switch and Cache Engine, page 81-8 (Optional)
Configuring a Service Group Using WCCP
WCCP uses service groups based on logical redirection services. The standard service is the content
engine, which intercepts TCP port 80 (HTTP) traffic and redirects that traffic to the content engines. This
service is referred to as a well-known service, because the characteristics of the web cache service are
known by both the router and content engines. A description of a well-known service is not required
beyond a service identification (the command line interface (CLI) provides a web-cache keyword in the
command syntax).
For information on supported WCCP services with ACNS version 5.2 software, refer to the
Release Notes for Cisco ACNS Software, Release 5.2.3.
In addition to the web cache service, there can be up to seven dynamic services running concurrently on
the switch.
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