From: alsontra@hotmail.com
Date: Mon Feb 02 2004 - 16:16:32 GMT-3
If your using this type configuration with PIM-SM, the RP and mapping agent
must be configured on the HUB router, correct? How does PIM in dense mode
deal with this config? You have to build tunnels on the HUB to satisfy RPF,
right????
Alsontra
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "'Bob Sinclair'" <bsin@cox.net>; "'Ashok Verma (ashoverm)'"
<ashoverm@cisco.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, February 02, 2004 8:53 AM
Subject: RE: Multicast Question
> Technically a multicast feed can be sent out the same interface it
> is received on. This is in the case of PIM sparse running in NBMA mode.
>
> With NBMA mode, the OIL is associated by peer IP address, not the
> outgoing interface. Therefore in this case when R1 receives a feed from
R2,
> the incoming interface is seen as R2's IP address, not the interface
> connected to the Frame Relay cloud, and the outgoing interface to R3 is
R3's
> IP address, not the interface connected to the Frame Relay cloud.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 708-362-1418 (Outside the US and Canada)
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Bob Sinclair
> > Sent: Monday, February 02, 2004 6:59 AM
> > To: Ashok Verma (ashoverm)
> > Cc: ccielab@groupstudy.com
> > Subject: Re: Multicast Question
> >
> > Ashok,
> >
> > By design, PIM sparse and dense modes will not send traffic out the
> > incoming
> > interface. This is part of the PIM method for creating loop free trees.
> > More formally, the incoming interface will not show up on the outgoing
> > interface list of the S,G entry.
> >
> > In order to get the multicast stream through R1 to R2, you will need to
> > have
> > it arrive one one R1 interface (or subinterface) and leave on another.
> >
> > HTH,
> >
> > Bob Sinclair
> > CCIE #10427, CISSP, MCSE
> > www.netmasterclass.net
> >
> >
> >
> > ----- Original Message -----
> > From: "Ashok Verma (ashoverm)" <ashoverm@cisco.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Monday, February 02, 2004 5:00 AM
> > Subject: Multicast Question
> >
> >
> > > Hi All ,
> > >
> > > I have a very simple setup of Muticast,
> > >
> > > R1
> > > / \
> > > / \
> > > R2 R3
> > >
> > > FR cloud is used between these routers and R1 is Hub, other router are
> > > spoke.
> > >
> > > If I enable multicast in on all three router and join a multicast
> > > group(224.8.8.2)on R2, I am able to ping that group from R1 but not
from
> > > R3, I had enabled the Ip Pim dense mode on all the interfaces as
> > > required.
> > >
> > > So question is Do I need to do some more configuraiton on R1 so that
R3
> > > should able to ping the multicast group.
> > >
> > > Thanks in advance.
> > >
> > > Ashok Kumar Verma
> > > CCIP,CCDP,CCNP
> > > Network Consulting Engineer
> > > Customer Advocacy Advanced Service Dep.
> > > Service Provider AS Div.2
> > > Cisco Systems, K.K.Japan.
> > >
> > > Tel: +81-3-5324-4583
> > > e-mail: ashoverm@cisco.com
> > >
> > >
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