Why 2 Ping Replies in IP Multicast?

From: Tariq Sharif (tariq_sharif@xxxxxxxxxxxxxx)
Date: Mon Apr 09 2001 - 11:20:00 GMT-3


   
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

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