From: Joe Chang (changjoe@earthlink.net)
Date: Mon Dec 09 2002 - 20:27:09 GMT-3
That's interesting Suren. Could you try to capture some debugs on the
RP-Announce and RP-Discovery messages and share them with us?
----- Original Message -----
From: "Surendran" <surenv@hpssk211.sgp.hp.com>
To: "'Joe Chang'" <changjoe@earthlink.net>; <ccielab@groupstudy.com>
Sent: Monday, December 09, 2002 8:03 AM
Subject: RE: Multicast NBMA
> 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. .
> .
.
This archive was generated by hypermail 2.1.4 : Fri Jan 17 2003 - 17:21:41 GMT-3