The nature of the selected traffic for redirection is defined by service groups (see figure below) specified on
content engines and communicated to routers by using WCCP. The maximum number of service groups
allowed across all VRFs is 256.
WCCPv2 supports up to 32 routers per service group. Each service group is established and maintained
independently.
WCCPv2 uses service groups based on logical redirection services, deployed for intercepting and redirecting
traffic. The standard service is web cache, which intercepts TCP port 80 (HTTP) traffic and redirects that
traffic to the content engines. This service is referred to as a well-known service, because the characteristics
of the web cache service are known by both the router and content engines. A description of a well-known
service is not required beyond a service identification. To specify the standard web cache service, use the ip
wccp or the ipv6 wccp command with the web-cache keyword.
More than one service can run on a router at the same time, and routers and content engines can be part
of multiple service groups at the same time.
Note
Figure 7: WCCP Service Groups
The dynamic services are defined by the content engines; the content engine instructs the router which protocol
or ports to intercept, and how to distribute the traffic. The router itself does not have information on the
characteristics of the dynamic service group’s traffic, because this information is provided by the first content
engine to join the group. In a dynamic service, up to eight ports can be specified within a single protocol.
Cisco Content Engines, for example, use dynamic service 99 to specify a reverse-proxy service. However,
other content engine devices may use this service number for some other service.
WCCP—Check All Services
An interface may be configured with more than one WCCP service. When more than one WCCP service is
configured on an interface, the precedence of a service depends on the relative priority of the service compared
IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
99
WCCPv2—IPv6 Support
WCCP—Check All Services
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