Understanding Wccpv1 Configuration - Cisco 6500 Series Software Configuration Manual

Chapter 35 Configuring Web Cache Services Using WCCP
With Release 12.1(2)E and later releases, WCCP Layer 2 PFC redirection allows Cisco Cache Engines
to use hardware-supported Layer 2 redirection. A directly connected Cache Engine can be configured to
negotiate use of the WCCP Layer 2 PFC Redirection feature. The WCCP Layer 2 PFC redirection feature
requires no configuration on the MSFC. The show ip wccp web-cache detail command displays which
redirection method is in use for each cache.
The following guidelines apply to WCCP Layer 2 PFC redirection:
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Note A future release of Cisco Application and Content Networking System (ACNS) software (Release 4.2.2
or later) supports the accelerated keyword with Release 12.1(13)E and later releases.

Understanding WCCPv1 Configuration

With WCCP-Version 1, only a single router services a cluster. In this scenario, this router is the device
that performs all the IP packet redirection.
Figure 35-1 Cisco Cache Engine Network Configuration Using WCCP-Version 1
Clients
Content is not duplicated on the cache engines. The benefit of using multiple caches is that you can scale
a caching solution by clustering multiple physical caches to appear as one logical cache.
The following sequence of events details how WCCPv1 configuration works:
1.
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The WCCP Layer 2 PFC redirection feature sets the IP flow mask to full-flow mode.
You can configure the Cisco Cache Engine software release 2.2 or later releases to use the WCCP
Layer 2 PFC redirection feature.
Layer 2 redirection takes place on the PFC and is not visible to the MSFC. The show ip wccp
web-cache detail command on the MSFC displays statistics for only the first packet of a Layer 2
redirected flow, which provides an indication of how many flows, rather than packets, are using
Layer 2 redirection. Entering the show mls entries command displays the other packets in the Layer
2 redirected flows.
Internet
Router
Clients
Each cache engine is configured by the system administrator with the IP address of the control
router. Up to 32 cache engines can connect to a single control router.
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
Figure 35-1 illustrates how this configuration appears.
100BASE-T
Cache 1
Cache 2
Cache 3
Understanding WCCP
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