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Configure the Web Cache Control Protocol

FC-116

Configuration Fundamentals Configuration Guide

Conﬁgure the Web Cache Control Protocol

The Web Cache Control Protocol (WCCP) feature allows you to use a Cisco Cache Engine to handle

Web trafﬁc, thus reducing transmission costs and downloading 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. Figure 10 shows a sample WCCP network conﬁguration.

Figure 10 Sample Cisco Cache Engine Network Conﬁguration

When a user (client) requests a page from a Web server (located in the Internet, in this case), the

router sends the request to a Cisco Cache Engine (Cache 1, Cache 2, or Cache 3). If the cache engine

has a copy of the requested page in storage, the engine sends the user that page. Otherwise, the

engine gets the requested page and the objects on that page from the Web server, stores a copy of the

page and its objects (caches them), and forwards the page and objects to the user.

WCCP transparently redirects HTTP requests from the intended server to a Cisco Cache Engine.

End users do not know that the page came from the cache engine rather than the originally requested

Web server.

The Using Cisco Cache Engine publication contains detailed information about the Cisco Cache

Engine and discusses alternative network conﬁgurations.

Beneﬁts of Using WCCP

Web caches reduce transmissions costs and the amount of time required to download Web ﬁles. If a

client requests a Web page that is already cached, the request and data only have to travel between

the Cisco Cache Engine and the client. Without a Web cache, the request and reply must travel over

the Internet or wide-area network. Cached pages can be loaded faster than non-cached pages and do

not have to be transmitted from the Internet to your network.

Cisco IOS support of WCCP provides a transparent Web cache solution. Users can beneﬁt from Web

proxy caches without having to conﬁgure clients to contact a speciﬁc proxy server in order to access

Web resources. Many Web proxy caches require clients to access Web resources through a speciﬁc

proxy Web server rather than using the originally requested Web server URL. With WCCP, the

clients send Web requests to the desired Web server URL. Cisco IOS routers intelligently intercept

HTTP requests and transparently redirect them to a Cisco Cache Engine.

S6529

Internet

100BaseT

Cache 1

Cache 2

Cache 3

Clients

Router

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