First Hop Redundancy Protocols Configuration Guide, Cisco IOS Release 15S
Configuring IRDP
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Configuring IRDP

Configuring IRDP

Last Updated: December 2, 2012

The ICMP Router Discovery Protocol (IRDP) allows IPv4 hosts to locate routers that provide IPv4 connectivity to other (nonlocal) IP networks. For a complete description of the IPv4 addressing commands in this module, refer to the Cisco IOS IP Application Services Command Reference. To locate documentation of other commands that appear in this module, use the command reference master index or search online.

This module explains the concepts related to IRDP and describes how to configure IRDP in a network.

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 IRDP

IRDP Overview

ICMP Router Discovery Protocol (IRDP) allows hosts to locate routers that can be used as a gateway to reach IP-based devices on other networks. When the device running IRDP operates as a router, router discovery packets are generated. When the device running IRDP operates as a host, router discovery packets are received. The Cisco IRDP implementation fully conforms to the router discovery protocol outlined in RFC 1256 (http://www.ietf.org/rfc/rfc1256.txt).

How to Configure IRDP

Configuring IRDP

SUMMARY STEPS

1.    enable

2.    configure terminal

3.   no ip routing

4.   ip gdp irdp [multicast]

5.    interface type number

6.    no shutdown

7.    ip address ip-address mask

8.    ip irdp

9.    ip irdp multicast

10.    ip irdp holdtime seconds

11.    ip irdp maxadvertinterval seconds

12.    ip irdp minadvertinterval seconds

13.    ip irdp preference number

14.    ip irdp address address number

15.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no ip routing


Example:

Router(config)# no ip routing

 

Disables IP routing

 
Step 4
ip gdp irdp [multicast]


Example:

Router(config)# ip gdp irdp

 

Configures a gateway to discover routers that transmit IRDP router updates.

 
Step 5
interface type number


Example:

Router(config)# interface fastethernet 0/0

 

Specifies an interface and enters interface configuration mode.

 
Step 6
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates (enables) the interface.

 
Step 7
ip address ip-address mask


Example:

Router(config-if)# ip address 172.16.16.1 255.255.240.0

 

Configures an IP address on the interface.

 
Step 8
ip irdp


Example:

Router(config-if)# ip irdp

 

Enables IRDP on the interface

 
Step 9
ip irdp multicast


Example:

Router(config-if)# ip irdp multicast

 

(Optional) Sends IRDP advertisements to the all-systems multicast address (224.0.0.1) on a specified interface.

 
Step 10
ip irdp holdtime seconds


Example:

Router(config-if)# ip irdp holdtime 120

 

(Optional) Sets the IRDP period for which advertisements are valid.

 
Step 11
ip irdp maxadvertinterval seconds


Example:

Router(config-if)# ip irdp maxadvertinterval 60

 

(Optional) Sets the IRDP maximum interval between advertisements.

 
Step 12
ip irdp minadvertinterval seconds


Example:

Router(config-if)# ip irdp minadvertinterval 10

 

(Optional) Sets the IRDP minimum interval between advertisements.

 
Step 13
ip irdp preference number


Example:

Router(config-if)# ip irdp preference 900

 

(Optional) Sets the IRDP preference level of the device.

 
Step 14
ip irdp address address number


Example:

Router(config-if)# ip irdp address 192.168.10.2 90

 

(Optional) Specifies an IRDP address and preference to proxy-advertise.

 
Step 15
end


Example:

Router(config-if)# end

 

Exits the current configuration mode and returns to privileged EXEC mode.

 

Configuration Examples for IRDP

Example: Configuring IRDP

The following example shows how to configure IRDP on a router:

Router(config)# no ip routing
Router(config)# ip gdp irdp
Router(config)# interface fastethernet 0/1
Router(config-if)# no shutdown
Router(config-if)# ip address 172.16.10.1 255.255.255.0
Router(config-if)# ip irdp
Router(config-if)# ip irdp multicast
Router(config-if)# ip irdp holdtime 120
Router(config-if)# ip irdp maxadvertinterval 60
Router(config-if)# ip irdp minadvertinterval 10
Router(config-if)# ip irdp preference 900
Router(config-if)# ip irdp address 192.168.10.2 90

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IP application services commands

Cisco IOS IP Application Services Command Reference

Standards and RFCs

Standard

Title

RFC 1256

ICMP Router Discovery Messages

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for IRDP

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 IRDP

Feature Name

Releases

Feature Information

ICMP Router Discovery Protocol

15.2(1)S

The ICMP Router Discovery Protocol (IRDP) allows IPv4 hosts to locate routers that provide IPv4 connectivity to other (non-local) IP networks.

The following command was introduced or modified: ip irdp.

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2012 Cisco Systems, Inc. All rights reserved.