Web Cache Communication Protocol (WCCP) is a Cisco-developed content-routing protocol that provides a mechanism to redirect traffic flows in real-time. It has built-in load balancing, scaling, fault tolerance, and service-assurance (failsafe) mechanisms.
To coordinate with the routers and content engine. (cache engines).
Use UDP 2048 port between router and content engine.
Up to 32 contect engine can communicate with single router using WCCPv1. If more then content engine present, the one with lowest IP is elected as Lead Engine.
In WCCPv1, only 1 router can redirect traffic to a content engine or a group/cluster of engines.
In WCCPv2, multiple routers can redirect traffic multiple content engines and can be configured as WCCP service group.
WCCPv1 only support HTTP Traffic (TCP80)
WCCPv2 support several other protocol like FTP, Audio, telephony, provide MD5 security in WCCP communication by this cmd #ip wccp password (password)
Default version on routers is Version 2.
Can use with access-list too.
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