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Web Cache Control Protocol

The Web Cache Communication Protocol (WCCP), developed by Cisco Systems, specifies interactions between one or more routers (or Layer 3 switches) and one or more web-caches. The purpose of the interaction is to establish and maintain the transparent redirection of selected types of traffic flowing through a group of routers. The selected traffic is redirected to a group of web-caches with the aim of optimizing resource usage and lowering response times.

Squid v2.3 and above supports WCCP v1
Microsoft Proxy or ISA doesn't appear to support WCCP


In English, WCCP is a way for a cisco router to check that a web proxy is up and where it is so that it can transparently redirect web traffic at it. This is the idea behind transparent proxying that your ISP uses to confuse your browser ;)