Re: Why 2 Ping Replies in IP Multicast?

From: Rodgers Moore (rodgers@xxxxxxxxxxxxxx)
Date: Mon Apr 09 2001 - 12:15:36 GMT-3


   
1) What happens a multicast packet enters the router? In dense mode, it's forw
arded out all multicast
enabled interfaces, except the one where it entered the router. 2) What happen
s to a packet that goes
out a loopback? It comes back in. 3) go to 1

You've got a loopback interface configured for dense mode PIM. I'd bet that if
 you configured a
second loopback, you'd get three responses.

Rodgers Moore

Tariq Sharif wrote:

> Using the config below R2 belongs to 226.1.1.1 m/cast group. If I ping it
> from R1 (ping 226.1.1.1) I get 2 replies rather than 1. If I remove the
> loopback on R1 it then gives 1 reply. Does anyone know why?
>
> hostname R1
> ip multicast-routing
> !
> interface Loopback0
> ip address 140.1.11.1 255.255.255.252
> ip pim dense-mode
> !
> interface TokenRing0/0
> ip address 140.1.0.1 255.255.254.0
> ip pim dense-mode
> no ip directed-broadcast
> end
>
> hostname R2
> !
> ip multicast-routing
> !
> interface TokenRing1/0
> ip address 140.1.0.2 255.255.254.0
> ip pim dense-mode
> ip igmp join-group 226.1.1.1
> end
>
>
> Many thanks & regards.
>
> Tariq Sharif
>
> [GroupStudy.com removed an attachment of type application/ms-tnef which had a
 name of winmail.dat]



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