From: Bob Sinclair (bsin@cox.net)
Date: Fri May 07 2004 - 21:08:36 GMT-3
Yasser,
The tools I rely on to troubleshoot auto-rp are the commands:
sh ip pim rp [mapping] ;
sh ip mroute
and mtrace [candidate source or mapping agent source]
Sometimes you need a static mroute on a router so that the source ip for the
rp-candidate, or the source ip for the mapping agent traffic passes the rpf
check.
Sometimes you have to fight the dense-mode oilist issue; that the rpf
interface will not go on the outgoing interface list. In other words, don't
try to get the dense mode groups 224.0.1.39 or 224.0.1.40 to go into and
back out of a multipoint frame interface.
My own take on multicast troubleshooting is that the problem is very likely
related to a failed rpf check (fix with static mroute) or it is related to
an outgoing interface list issue (fix by engineering the path so it comes in
one interface and out another)
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Yasser Aly" <blackyeyes00@hotmail.com>
To: <bsinclair@netmasterclass.net>; <sejimenez@its.co.cr>;
<ccielab@groupstudy.com>
Sent: Friday, May 07, 2004 4:30 PM
Subject: Re: IP Multicast over FR!!!
> Hi Bob,
>
> Would you kindly advice how to verify the following:
> A) The mapping agent can receive the dense-mode traffic from the RP on
group
> 224.0.1.39 ?
> B) All routers can receive the dense-mode group 224.0.1.40 from the
mapping
> agent ?
>
> I know how to config Multicast but frequently have hard time
troubleshooting
> it when it is not working.
>
> Thanx for your help.
> Yasser
>
>
> ====================
> Sergio,
>
> You can use sparse-dense mode on an NBMA network with Auto-RP, though it
> does present some challenges. Generally, you will want to put the mapping
> agent at the hub.
>
> There are two basic challenges, though. You must make sure that the
mapping
> agent can receive the dense-mode traffic from the RP on group 224.0.1.39.
> You must also make sure that all of the routers can receive the dense-mode
> group 224.0.1.40 from the mapping agent.
>
> Starting in IOS 12.2(7) the global command:
>
> ip pim auto-rp listener
>
> permits you to run auto-rp over interfaces that are only configured for
> sparse mode. It allows only the auto-rp groups 224.0.1.39 and 224.0.1.40
to
> use dense mode.
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CISSP, MCSE
> www.netmasterclass.net
>
> ----- Original Message -----
> From: "Sergio Jimenez Arguedas" <sejimenez@its.co.cr>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, May 06, 2004 10:05 PM
> Subject: IP Multicast over FR!!!
>
>
> >Hi Group,
> >
> >I have a doubt about Auto-RP in NBMA networks, I read it and made the LAB
> >
>
http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/mcst_sol/frm_rlay.h
> >tm, Also I made the LAB in Practical Studies VolumenII.(Chapter 3, pag
> 248).
> >
> >Q1: Can I use IP PIM Sparse-dense-mode in a NBMA with AUTO-RP?
> >
> >With static RP I don4t have problems. The URL link has SPARSE-MODE in the
> NBMA
> >intf, but the book has SPARSE-DENSE-MODE!!!
> >
> >I think I can4t use AUTO-RP without DENSE-MODE!!!
> >
> >
> >Thanks,
> >
> >
> >Sergio Jiminez A.
> >
> >_______________________________________________________________________
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