multicast question

[NAVIN PARWAL]

I am using autorp how can i preven any new rp with higher ip address from taking over, rp-announce-filter requires me to specify the rp specifically which should be denied, what if I do not know what the new rp is going to be?

[n.nandrekar]

Hi!

You dont know which RP addresses you want to filter. But if you know which Ip addresses you can atleast accept as RP, you could use the following command :

Ferrari(config)#ip pim accept-rp auto-rp ?

<1-99> Access-list reference for group

<1300-1999> Access-list reference for group (expanded range)

WORD IP Named Standard Access list

So the device can only accept the IP addresses matching the ip access list and announced through auto-rp as the possible RP.

Regards,

Niranjan