From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Feb 02 2004 - 13:53:15 GMT-3
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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