Specifications

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Cisco Wide Area Application Services Command Reference

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Chapter 3 CLI Commands

(config) wccp flow-redirect

To enable WCCP flow redirection on a WAE, use the wccp flow-redirect global configuration

command. To disable flow redirection, use the no form of this command.

wccp flow-redirect enable

Syntax Description

Defaults Enabled

Command Modes global configuration

Device Modes application-accelerator

Usage Guidelines WCCP flow protection is a mechanism that ensures that no existing flows are broken when a new WAE

is brought online or removed from a service group. When transparent traffic interception or redirection

first begins, WCCP flow protection ensures that no existing HTTP flows are broken by allowing

preexisting, established HTTP flows to continue on. WCCP flow protection also ensures that when a new

WAE joins an existing WAE group, existing flows serviced by preexisting WAEs in the cluster continue

to receive those existing flows.

The mechanisms used by WCCP flow protection result in all of the benefits of maintaining per flow state

information in a centralized location but without the overhead, scaling issues, and redundancy or

resiliency issues (for example, asymmetrical traffic flows) associated with keeping per flow state

information in the switching layer.

Use the wccp flow-redirect global configuration command to implement WCCP flow protection. Flow

protection is designed to keep the TCP flow intact as well as to not overwhelm WAEs when they are first

started up or are reassigned new traffic. This feature also has a slow start mechanism whereby the WAEs

try to take a load appropriate for their capacity.

Note When bypass is enabled, the client itself tries to reach the origin web server. You must disable all bypass

options to eliminate an unnecessary burden on the network.

WCCP works only with IPv4 networks.

Examples The following example shows how to enable WCCP flow protection on a WAE:

WAE(config)# wccp flow-redirect enable

Related Commands (config) wccp slow-start

enable Enables flow redirection.