IP Application Services Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)
WCCP - Configurable Router ID
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WCCP - Configurable Router ID

WCCP--Configurable Router ID

Last Updated: January 30, 2013

The WCCP--Configurable Router ID feature enables the configuration of a Web Cache Communication Protocol (WCCP) source interface. The IP address of this configured source interface is then used as the preferred WCCP router ID and WCCP GRE source address. When a WCCP router ID is manually configured, router IDs are no longer automatically generated when the current router ID is no longer valid and the router ID does not change when another IP address is added to the system.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Information About WCCP--Configurable Router ID

WCCP--Configurable Router ID Overview

WCCP uses a router ID in its control messages that a WCCP client can use to uniquely identify a particular WCCP server. The router ID is an IP address and is used as the source address of any WCCP-generated Generic Routing Encapsulation (GRE) frames. Prior to the WCCP--Configurable Router ID feature, WCCP selected a router ID using an automatic mechanism; the highest reachable IP address on the system (or the highest loopback IP address, if there is one) was used as the WCCP router ID. The highest IP address on the system is not always the best choice as the router ID or as the source address of GRE frames. A change in addressing information on the system may cause the WCCP router ID to change unexpectedly. During this changeover period, WCCP clients briefly advertise the existence of two routers (the old router ID and the new router ID) and GRE frames are sourced from a different address.

The WCCP--Configurable Router ID feature enables you to define a WCCP source interface from which the router ID will be obtained. The IP address of this configured source interface is then used as the preferred WCCP router ID and WCCP GRE source address. When a WCCP router ID is manually configured, the router ID does not change when another IP address is added to the system. The router ID changes only when a new router ID is manually configured using the ip wccp source-address or the ipv6 wccp source-address command, or when the address on the manually configured interface is no longer valid.

How to Configure WCCP--Configurable Router ID

Configuring a Preferred WCCP Router ID

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ip wccp [vrf vrf-name] source-interface source-interface

4.    exit


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
ip wccp [vrf vrf-name] source-interface source-interface


Example:

Device(config)# ip wccp source-interface GigabitEthernet 0/0/0

 

Configures a preferred WCCP router ID.

 
Step 4
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Configuration Examples for WCCP--Configurable Router ID

Example: Configuring a Preferred WCCP Router ID

The following example displays the configuration for a preferred WCCP router ID:


! Configure a preferred WCCP router ID
ip wccp source-interface GigabitEthernet 0/0/0

Feature Information for WCCP--Configurable Router ID

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1 Feature Information for WCCP--Configurable Router ID
Feature Name Releases Feature Information

WCCP--Configurable Router ID

15.1(1)SG

15.2(3)T

Cisco IOS XE Release 3.1S

Cisco IOS XE Release 3.3SG

Cisco IOS XE Release 15.1(1)SY

Cisco IOS XE Release 3.2SE

The WCCP--Configurable Router ID feature enables the configuration of a Web Cache Communication Protocol (WCCP) source interface. The IP address of this configured source interface is then used as the preferred WCCP router ID and WCCP GRE source address. When a WCCP router ID is manually configured, router IDs are no longer automatically generated when the current router ID is no longer valid and the router ID does not change when another IP address is added to the system.

The following command was added: ip wccp source-interface.

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