Configuring WCCP This section provides information about configuring WCCP. Prerequisites for WCCP, on page 1 Restrictions for WCCP, on page 1 Information About WCCP, on page 3 How to Configure WCCP, on page 9 Configuration Examples for WCCP, on page 16 Feature History for WCCP, on page 21 Prerequisites for WCCP • To use WCCP, IP must be configured on the interface connected to the Internet and another interface must be connected to the content engine. • The interface connected to the content engine must be a Fast Ethernet or Gigabit Ethernet interface. Restrictions for WCCP General The following limitations apply to Web Cache Communication Protocol Version 2 (WCCPv2):
• WCCP works only with IPv4 networks. • WCCP bypasses Network Address Translation (NAT) when Cisco Express Forwarding is enabled. • WCCP does not interoperate with NAT and the zone-based firewall configured together in a network. • Service groups can comprise up to 32 content engines and 32 switches. • For switches servicing a multicast cluster, the Time To Live (TTL) value must be set at 15 or fewer. • All content engines in a cluster must be configured to communicate with all devices servicing the cluster. • Multicast addresses must be from 224.0.0.0 to 239.255.255.255. Configuring WCCP 1