Cisco Cisco IOS Software Release 12.0(11)S

This feature module describes the Web Cache Communication Protocol (WCCP) Enhancements feature 
and includes information on the benefits of the new feature, supported platforms, configuration tasks and 
a command reference.

This document includes the following sections:

WCCP enhancements add support for WCCP Version 2 for Cisco IOS Release 12.0 (11)S. With the 
WCCP feature you can use Cisco Cache engines or third-party cache engines to handle web traffic, 
reducing transmission costs and download time. This traffic includes user requests to view pages and 
graphics on World Wide Web servers, whether internal or external to your network, and the replies to 
those requests. When a user requests a page from a web server (located in the Internet), the router sends 
the request to a cache engine. If the cache engine has a copy of the requested page in storage, the cache 
engine sends the user that page. Otherwise, the cache engine retrieves the requested page and the objects 
on that page from the web server, stores a copy of the page and its objects, and forwards the page and 
objects to the user.

WCCP transparently redirects a variety of traffic types, specified by protocol (TCP or UDP) and port. 
Cisco Cache Engine supports only redirection of HTTP (TCP port 80) traffic requests from the intended 
server to a cache engine. End users do not know that the page came from the cache engine rather than 
from the originally requested web server.