Wccpv2 Overview; Wccpv2 Service Types; Service Groups; Service Group Lists - Cisco Nexus 7000 Series Configuration Manual

Information About WCCPv2

S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .

WCCPv2 Overview

WCCPv2 enables the Cisco NX-OS router to transparently redirect packets to cache engines. WCCPv2
does not interfere with normal router operations. Using WCCPv2, the router can redirect requests on
configured interfaces to cache engines rather than to intended host sites. With WCCPv2, the router can
balance traffic loads across a cluster of cache engines (cache cluster) and ensure fault-tolerant and
fail-safe operation in the cluster. As you add or delete cache engines from a cache cluster, WCCPv2
dynamically redirects the packets to the currently available cache engines.
WCCPv2 accepts the traffic at the cache engine and establishes the connection with the traffic originator
(the client). The cache engine acts as if it were the original destination server. If the requested object is
not available on the cache engine, the cache engine then establishes its own connection out to the original
destination server to retrieve the object.
WCCPv2 communicates between routers and cache engines on UDP port 2048.
By allowing a cache cluster to connect to multiple routers, WCCPv2 provides redundancy and a
distributed architecture for instances when a cache engine needs to connect to a large number of
interfaces. In addition, WCCPv2 allows you to keep all the cache engines in a single cluster, which
avoids the unnecessary duplication of web pages across several clusters.
This section includes the following topics:
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WCCPv2 Service Types

A service is a defined traffic type that the router redirects to a cache engine with the WCCPv2 protocol.
You can configure the router to run one of the following cache-related services:
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Service Groups

A service group is a subset of cache engines within a cluster and the routers connected to the cluster that
are running the same service.
and the routers can be a part of multiple service groups.
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
5-2
WCCPv2 Service Types, page 5-2
Service Groups, page 5-2
Service Group Lists, page 5-3
WCCPv2 Designated Cache Engine, page 5-4
Redirection, page 5-4
Well-known —The router and the cache engine know the traffic type, for example the web cache
service on TCP port 80 for HTTP.
Dynamic service—A service in which the cache engine describes the type of redirected traffic to the
router.
Figure 5-1 shows a service group within a cache cluster. The cache engines
Chapter 5 Configuring WCCPv2
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