All things related to multicast

[John Haskins <>]

You can make your router ignore auto-rp announcements globally by using
'override' when you statically configure the rp:

ip pim rp-address (rp-address) override
override: Indicates that if there is a conflict, the RP configured with this
command prevails over the RP learned by Auto-RP.

If you wanted to just ignore auto-rp arriving on one interface, I see that
there is a 'filter-autorp' keyword to the 'ip multicast boundary' command that
was introduced in 12.0(22)S and has been integrated into recent 12.1 and 12.2
releases.  I have not tried it.

-john

Luís Marta wrote:

> Hi.
>
> Is it possible to switch off auto-rp on a cisco router?
> I'm trying to stop announce messages to groups 224.0.1.39 and 224.0.1.40
> from arriving to a determined interface with the interface command:
>
> ip multicast boundary 10
>
> Standard IP access list 10
>     10 deny   224.0.1.39
>     20 deny   224.0.1.40
>     30 permit any
>
> But it's not working, the router still receives the auto-rp announce
> messages coming from that interface:
>
> - debug ip pim auto-rp
> Sep 22 15:57:07: Auto-RP(0): Received RP-discovery, from X.X.X.X, RP_cnt 1,
> ht 181
> Sep 22 15:57:07: Auto-RP(0): Added with (224.0.0.0/4, RP:X.X.X.X), PIMv2 v1
>
> Is there another way to do it?
>
> Thank you,
> Luis Marta.