WCCP

Web Cache Communication Protocol

The Web Cache Communication Protocol (WCCP) is a Cisco-developed content-routing technology that intercepts IP packets and redirects those packets to a destination other than that specified in the IP packet.

• UDP port 2048
• Redirecting or returning traffic via GRE (client to be multiple hops away from the router) or L2 Forwarding (the client and server on the same subnet)

	Device	Function
WCCP Client	Content Engine/Proxy	A device, such as a Secure Web Appliance (SWA) that receives redirected traffic to either fulfill the request from its local cache or process it further.
WCCP Server	Router/Switch	A WCCP-enabled router or L3 switch that intercepts and redirects traffic based on specified service groups.
Service Group	Configuration	A logical grouping of WCCP servers and clients that share the same configuration settings for traffic redirection.

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Configuring WCCP on Routers

ACL	Function	What it controls	Example Devices/Apps
group-list	Clients Filter	Defines which Cache Engines (clients) are allowed to join the service group.	SWA with IP 10.0.0.10
redirect-list	Traffic Selection	An ACL that identifies specific user traffic (e.g., HTTP/HTTPS) to be redirected.	HTTP (Port 80), HTTPS (Port 443)