Re: How to determine using Ip mroute for RPF CHeck or not ?

From: Fahad Khan (fahad.khan@gmail.com)
Date: Wed Nov 12 2008 - 11:52:28 ARST

Mark,

Actually a router checks the unicast routing path back to the source from
which it received the Multicast packet, called RPF, if It finds an outgoing
interface other than that received the Multicast traffic, then it is
considered to be an RPF failure in front of the router.

Thats why some times you forcefully add an mroute to the source from the
same outgoing interface (defined for unicast route path) , hence eliminates
the RPF failure.

"ip igmp join group" is the command used for testing only for any mode.
through this command you enable a router as a "listener" of multicast
traffic

HTH

On 11/12/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> guys,
>
>
>
> My real lab just in a couple of weeks forward and I still don't know how to
> verify when I have to us ip mroute static for multicast or not.
>
>
>
> How can I debug when there is an rpf failure ? How to verify it ?
>
>
>
> The mroute static is used for the source to the client only right ? For
> multicast we just have to concern about the route from source to client,
> not
> client to source ?
>
>
>
> And when to test a multicast source connection with a command interfce ip
> igmp join group, is that interface have to be a part of the mulcticast
> mode
> (sparse-mode, dense-mode, sparse-dense mode)?
>
>
>
> Please correct me if I'm wrong
>
>
>
> Thanks a lot guys
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
> IT Consultant
>
>
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-- 
Fahad Khan
http://fahad-internetworker.blogspot.com

Blogs and organic groups at http://www.ccie.net

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