Part 1: First Hop Redundancy Protocols - Configuring IRDP [Cisco IOS Software Releases 12.4 T]

Table Of Contents

Configuring IRDP

Finding Feature Information

Contents

Information About IRDP

IRDP Overview

How to Configure IRDP

Configuring IRDP

Configuration Examples for IRDP

Example: Configuring IRDP

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for IRDP

Configuring IRDP

First Published: February 10, 2008

Last Updated: February 10, 2008

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

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see 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 for IRDP" section.

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

Contents

•Information About IRDP

•How to Configure IRDP

•Configuration Examples for IRDP

•Additional References

•Feature Information for IRDP

Information About IRDP

•IRDP Overview

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

Configuring IRDP

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. no shutdown

5. ip address ip-address mask

6. ip irdp

7. ip irdp multicast

8. ip irdp holdtime seconds

9. ip irdp maxadvertinterval seconds

10. ip irdp minadvertinterval seconds

11. ip irdp preference number

12. ip irdp address address number

13. 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

interface type number
Example:

Router(config)# interface fastethernet 0/0

Specifies an interface and enters interface configuration mode.

Step 4

no shutdown
Example:

Router(config-if)# no shutdown

Activates (enables) the interface.

Step 5

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 6

ip irdp
Example:

Router(config-if)# ip irdp

Enables IRDP on the interface

Step 7

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 8

ip irdp holdtime seconds
Example:

Router(config-if)# ip irdp holdtime 120

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

Step 9

ip irdp maxadvertinterval seconds
Example:

Router(config-if)# ip irdp maxadvertinterval 60

(Optional) Sets the IRDP maximum interval between advertisements.

Step 10

ip irdp minadvertinterval seconds
Example:

Router(config-if)# ip irdp minadvertinterval 10

(Optional) Sets the IRDP minimum interval between advertisements.

Step 11

ip irdp preference number
Example:

Router(config-if)# ip irdp preference 900

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

Step 12

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 13

end
Example:

Router(config-if)# end

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

Configuration Examples for IRDP

•Example: Configuring IRDP

Example: Configuring IRDP

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

Standard

Title

No new or modified standards are supported, and support for existing standards has not been modified

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported, and support for existing MIBs has not been modified

—

RFCs

RFC

Title

RFC 1256

ICMP Router Discovery Messages: http://www.ietf.org/rfc/rfc1256.txt

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

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

Table 1 lists the features in this module.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 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.

Table 1 Feature Information for IRDP

Feature Name

Releases

Feature Information

ICMP Router Discovery Protocol

10.0
12.2(33)SRA

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.

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