About Transparent Proxy with WCCP Mode
When implementing a proxy on a Web Gateway appliance, you can configure it to run in Transparent Proxy mode and use WCCP (Web Cache Communication Protocol) to redirect web traffic from the clients to Web Gateway.
Use of this protocol considerably enhances the capabilities for load balancing and failover.
Alternatively, you can use of the L2 (Layer 2) method to redirect web traffic. You can also configure both methods for redirecting web traffic at the same time.