From: Surendran (surenv@hpssk211.sgp.hp.com)
Date: Mon Dec 09 2002 - 09:03:15 GMT-3
Hi Joe,
That's what I thought too. However, it works. I have tried this,
the ip nbma-mode is doing something to help the forwarding, I guess..
Suren
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joe Chang
Sent: Sunday, December 08, 2002 11:24 PM
To: ccielab@groupstudy.com
Subject: Re: Multicast NBMA
> Hi Group,
> I have some question on Multicast over NBMA. I read from Cisco
> documentation that NBMA mode is to be used in a frame relay cloud and
> ip sparse mode should be used with this. However, I also understand
> Auto-RP, requires dense mode to broadcast its RP group advertisements.
> For example below,
>
>
> R1------R2-------FR--------R3
> \
> \___ R4
>
> R1 and R2 are connected to each other with ethernet cable. R2 is the
> central hub and R3 & R4 are spokes in the frame-relay cloud. Lets say,
> I am using R1 as my Candidate-RP and Mapping Agent. According to
> Cisco documentation I must run ip pim nbma-mode & ip pim sparse mode.
> R1 will be sending out RP information to all the routers. However, in
> a sparse mode environment the routers R3 & R4 must join the group
> 224.0.1.40 to receive this information in the first place.
> Theoretically, should not work....how then does it work?
>
You're right it won't work. ip pim sparse-dense-mode must be configured
on all the routers for this topology to work. In fact whenever multicast
routers are not directly connected to the mapping agent, sparse-dense
mode is required. .
.
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