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New Member

Anycast RP with same IP address

I have read that :

"Anycast RP is an implementation strategy that allows load sharing and redundancy in PIM sparse mode (PIM-SM) networks by configuring two or more RPs that have the same IP asddress and are using Multicast Source Discovery Protocol to share active source


What is meant by the phrase : "same IP asddress" ?


Cisco Employee

Re: Anycast RP with same IP address

The RP IP address will be the same for both RPs. Sources and receivers will send register or join messages to the RP that is closer to them according to the IGP. This is basically why you need to run MSDP between the RPs in order to propagate the active sources information.

PLease refer to the following link for detail information on Anycast RP.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
New Member

Re: Anycast RP with same IP address


I read the doc also you mentioned,that receivers will use the closest RP.

I have a few questions:

Is it possible for me to force the receivers to use one specific RP as primary even this RP may not be the closet RP?

and how?

Can we use some thing like access-list on the receiver router to force use one RP instead of the other RP? Is there any example for using access-list to achieve this?

Other option is try to tune the metric so that the closet RP will be the desired one?



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