From: Dillon Yang (gzdillon@hotmail.com)
Date: Sun Mar 27 2005 - 05:11:08 GMT-3
Hi, Sundar:
For 1, you may be ping the group by "ip pim nbma-mode" on R3.
Any can you offer the config and the output of "mtrace"?
dillon
----- Original Message -----
From: "Sundar Palaniappan" <sundarp@gmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, March 27, 2005 1:34 PM
Subject: Hub-and-spoke Multicast Behavior
> Guys,
>
> Just had a multicasting question come up.
>
> Have a simple hub-and-spoke setup.
>
> R1 & R2 are spokes using physical interface. R3 is the hub using a
> multipoint interface.
>
> Using PIM SM with R3 as the static RP.
>
> Multicasting Enabled interfaces.
>
> R1 e0
> R1 s0
> R2 e0
> R2 s0
> R3 s0.1
>
> R2's e0 has "ip igmp join-group 224.24.24.24" configured.
>
> Two Questions
>
> 1. I thought, I shouldn't be able to ping 224.24.24.24 from R1 and get
> any echo-replies. However, I was getting echo-replies for the 1st ping
> for one interface (s0) and subsequent pings failed. Why am I able to
> ping once from R1 since R3 shouldn't forward multicast packets back
> out the same interface to R2.
>
> 2. I created a tunnel int between R1 & R2. I am able to ping mcast
> group 224.24.24.24 from R1. However, I can't source R1's e0 and ping
> the multicast group. I always get one echo-reply only for the
> tunnel-interface. If the lab states user on R1's e0 should be able to
> receive multicast packets from R2's e0 would this work?
>
> TIA,
> Sundar Palaniappan
>
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