Re: multicast works even if interface is out of route table

> You mean that the join gets to the RP using the reachable interface
instead?

In regards to the statement above. How does the information about the
multicast receiver (ip igmp join-group on R1 Loopback0) get to the RP (R3)?
Answer this and you'll have answered your own question.

--
Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
bdennis_at_ine.com<mailto:bdennis_at_ine.com>
INE, Inc.
http://www.INE.com<http://www.ine.com/>
From: ccie99999 <ccie99999_at_gmail.com<mailto:ccie99999_at_gmail.com>>
Date: Monday, November 5, 2012 10:50 PM
To: Brian Dennis <bdennis_at_ine.com<mailto:bdennis_at_ine.com>>
Cc: Cisco certification
<ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>>
Subject: Re: multicast works even if interface is out of route table
Hi Brian,
but from R3 or R2 I 'm not able to reach 1.1.1.1 (R1's l 0 )
you mean that that router can join a group from every interface despite that
interface is not on routing table?
You mean that the join gets to the RP using the reachable interface instead?
Actually this makes a bit more sense to me now..
On Tue, Nov 6, 2012 at 6:27 AM, Brian Dennis
<bdennis_at_ine.com<mailto:bdennis_at_ine.com>> wrote:
Why is it not possible?
--
Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
bdennis_at_ine.com<mailto:bdennis_at_ine.com>
INE, Inc.
http://www.INE.com
On 11/5/12 9:14 PM, "ccie99999"
<ccie99999_at_gmail.com<mailto:ccie99999_at_gmail.com>> wrote:
>Hello everybody.
>
>I'm a bit confused about this:
>
>I'm testing a minilab:
>
>*R1* - 10.0.12.0/24<http://10.0.12.0/24> - *R2* -
10.0.23.0/24<http://10.0.23.0/24> - *R3*
>
>R1 is the receiver (ip igmp join 224.1.1.1 on loo 0)
>R2 is the server (ping 224.1.1.1 rep 100)
>R3 is the autorp
>ospf is the igp
>
>ok, everything works.
>if I shutdown the R1 L0 interface the ping stop to reply. OK, fine.
>but if the R1 L0 is up but not configured to be part of OSPF process the
>ping to 224.1.1.1 is still working and replies come from 10.0.12.1
>
>(already cleared ospf and ip mroute *)
>
>I don't get how this is possible.. someone can explain this?
>
>thanks
>
>
>
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>@ccie99999
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