From: shiran guez (shiranp3@gmail.com)
Date: Fri Nov 16 2007 - 12:52:02 ART
the ip pim auto rp listener is only to solve the problem of listening to
224.0.1.39 --> Candidate RP Sending to Mapping Agent
224.0.1.40 --> Mapping Agent Sending to all the Multicast Enabled Routers
as you know this 2 groups are Dense Mode and if you configure your interface
only to send sparse mode then you will not be able to FWD this groups and
the ip pim auto rp listener is solving this issue by allowing only this
groups to be sent in Dense. the other solution is to set the interface to
sparse-dense mode. and the solution Brian given is Tricking the router and
using this Dense Groups as Sparse and by doing so fwd this groups.
On Nov 16, 2007 5:34 PM, Gupta, Gopal (NWCC) <gopal.gupta@hp.com> wrote:
> Hi Brian,
>
> That's fine, but one question arises what about the groups those are
> actually forwarding multicast traffic for; we don't have RP for them and
> IP pim auto RP listener command has not been entered there for learning
> RP for those groups.
> Like we have configured
>
> Ip pim rp address 150.1.2.2 1
> access-list 1 permit 224.0.1.39
> access-list 1 permit 224.0.1.40
>
> We have assigned RP for only these 2 groups on every Router but what
> about group 224.1.1.1 that SW2 has joined; we don't have RP for this
> group or how shall we learn the RP for this group without either
> Sparse-dense mode or ip pim autorp listner.
>
> May be I am missing something here, please clarify..
>
> Thanks
> Gops
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Brian McGahan
> Sent: Friday, November 16, 2007 19:40
> To: kang lee; Cisco certification
> Subject: Re: auto-rp and default rp placement on IE workbook volume 1
> version 4.1
> Importance: Low
>
> You need to force the 224.0.1.39 and 224.0.1.40 groups to be sparse in
> order to be forwarded via NBMA mode. To do this you need to define a
> default RP that is used just for those two groups, i.e.:
>
> ip pim rp-address 1.2.3.4 1
> access-list 1 permit 224.0.1.39
> access-list 1 permit 224.0.1.40
>
>
> HTH,
>
>
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
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>
> ----- Original Message -----
> Subject: auto-rp and default rp placement on IE workbook volume 1
> version 4.1
> Date: Wed, November 14, 2007 15:31
> From: "kang lee" <kanghlee@gmail.com>
>
> > Hi GS,
> >
> > I am having problem with small lab, auto-rp and default rp placement
> > on IE workbook volume 1 version 4.1. This is asking to place rp ma and
>
> > ca on
> spoke
> > node on NBMA. I am having problems with propagating rp throughout the
> > domain. I think this is natural thing bc ip pim nbma-mode will not
> propagate
> > dense mode traffic.
> >
> > Anyone had this problem?
> >
> > thanks
> >
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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