Wccp Features - Cisco Catalyst 4500 Series Configuration Manual

About WCCP
The following sequence of events describe how WCCP works:
1.
2.
3.

WCCP Features

These sections describe WCCP features:
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•
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HTTP and Non-HTTP Services Support
WCCP enables redirection of HTTP traffic (TCP port 80 traffic), as well as non-HTTP traffic (TCP and
UDP). WCCP supports the redirection of packets intended for other ports, including those used for
proxy-web cache handling, File Transfer Protocol (FTP) caching, FTP proxy handling, web caching for
ports other than 80, and real audio, video, and telephony applications.
To accommodate the various types of services available, WCCP introduces the concept of multiple
service groups. Service information is specified in the WCCP configuration commands using dynamic
services identification numbers (such as "98") or a predefined service keywords (such as "web-cache").
This information is used to validate that service group members are all using or providing the same
service.
Note The Catalyst 4500 series switch supports up to eight service groups.
For information on supported WCCP version 2 services with ACNS version 5.2 software, refer to the
Release Notes for Cisco ACNS Software, Release 5.2.3.
The content engines in service group specify traffic to be redirected by protocol (TCP or UDP) and port
(source or destination). Each service group has a priority level assigned to it. Packets are matched against
service groups in priority order and redirected by the highest priority service group that matches traffic
characteristics.
Multiple Routers Support
WCCP enables you to attach multiple routers to a cluster of cache engines. The use of multiple routers
in a service group enables redundancy, interface aggregation, and distribution of the redirection load.
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
69-4
Each WCCP client (content engine) is configured with a list of WCCP servers (routers).
Each content engine announces its presence with a "Here I Am" message and a list of routers with
which it has established communication.s The routers reply with their view (list) of content engines
in the service group through "I See You" messages.
Once the view is consistent across all content engines in the cluster, one content engine is designated
as the lead and sets the policy that the switches need to deploy in redirecting traffic.
HTTP and Non-HTTP Services Support
Multiple Routers Support
MD5 Security
Web Content Packet Return
Chapter 69 Configuring WCCP Version 2 Services
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