From: Sundar Palaniappan (sundarp@gmail.com)
Date: Sun Mar 27 2005 - 12:47:06 GMT-3
Hi Dillon,
After configuring "ip pim nbma-mode" on R3 (hub) I am able to ping the
mcast group (224.24.24.24) from R1.
But the if the lab states not to configure "ip pim nbma-mode" on R3
then I guess tunneling is my only other choice. With tunnel between R1
& R2, I am able to ping 224.24.24.24 from R1 and get echo-reply only
for tunnel-int. If I source e0 on R1 and ping 224.24.24.24 it fails. I
even tried adding mroute on R2 but it still doesn't work. Any ideas?
Thanks,
Sundar Palaniappan
On Sun, 27 Mar 200 16:11:08 +0800, Dillon Yang <gzdillon@hotmail.com> wrote:
> 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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