Table Of Contents

Configuring IRDP

Finding Feature Information

Contents

Information About IRDP

IRDP Overview

How to Configure IRDP

Configuring IRDP

Configuration Examples for IRDP

Configuring IRDP: Example

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 IOS and Catalyst OS 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

To configure IRDP, you should understand the following concept:

•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

This section contains the following procedure:

•Configuring IRDP

Configuring IRDP

Perform this task to configure 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

This section provides the following configuration example:

•Configuring IRDP: Example

Configuring IRDP: Example

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

interface fastethernet 0/1

 no shutdown

 ip address 172.16.10.1 255.255.255.0

 ip irdp

 ip irdp multicast

 ip irdp holdtime 120

 ip irdp maxadvertinterval 60

 ip irdp minadvertinterval 10

 ip irdp preference 900

 ip irdp address 192.168.10.2 90

Additional References

The following sections provide references related to the IRDP feature.

Related Documents

Related Topic	Document Title
IP application services commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples	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 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 website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

Feature Information for IRDP

Table 1 lists the features in this module. For information on a feature in this technology that is not documented here, see the other available documentation for your Cisco IOS release.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS 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 Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS 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.

CCDE, CCENT, CCSI, Cisco Eos, Cisco HealthPresence, Cisco IronPort, the Cisco logo, Cisco Lumin, Cisco Nexus, Cisco Nurse Connect, Cisco Pulse, Cisco StackPower, Cisco StadiumVision, Cisco TelePresence, Cisco Unified Computing System, Cisco WebEx, DCE, Flip Channels, Flip for Good, Flip Mino, Flipshare (Design), Flip Ultra, Flip Video, Flip Video (Design), Instant Broadband, and Welcome to the Human Network are trademarks; Changing the Way We Work, Live, Play, and Learn, Cisco Capital, Cisco Capital (Design), Cisco:Financed (Stylized), Cisco Store, and Flip Gift Card are service marks; and Access Registrar, Aironet, AllTouch, AsyncOS, Bringing the Meeting To You, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco  IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, Continuum, EtherFast, EtherSwitch, Event Center, Explorer, Fast Step, Follow Me Browsing, FormShare, GainMaker, GigaDrive, HomeLink, iLYNX, Internet Quotient, IOS, iPhone, iQuick Study, IronPort, the IronPort logo, Laser Link, LightStream, Linksys, MediaTone, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, Network Registrar, PCNow, PIX, PowerKEY, PowerPanels, PowerTV, PowerTV (Design), PowerVu, Prisma, ProConnect, ROSA, ScriptShare, SenderBase, SMARTnet, Spectrum Expert, StackWise, The Fastest Way to Increase Your Internet Quotient, TransPath, WebEx, and the WebEx logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.

All other trademarks mentioned in this document or website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0908R)

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.

© 2008 Cisco Systems, Inc. All rights reserved.