RE: How does Mtrace work?

From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Thu Jul 20 2006 - 15:48:49 ART


Hi Ivan, could you please send us, an example of this
Theory is nice but is great to see also that working

Say that you have

R1 S0/0 ===FR========
                     S0/0 R3 E0/0 ======== E0/0 R5
R2 S0/0 ===FR========

You have to configure ip pim sparse, R5 would be RP for all Mcast groups and
R2 the Mapping Agent for all RP

Thanks
Victor.-

-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de Ivan
Enviado el: Jueves, 20 de Julio de 2006 02:16 p.m.
Para: ccielab@groupstudy.com; ciscocciein2006@gmail.com
Asunto: Re: How does Mtrace work?

Mtrace use special IGMP packet type (Queries and Response) AFAIR IGMP 1F and

1E. Requestor send packet to ther last-hop router. This router add some
usefull parameters such as IF, OF, input packet count, out packet count,
query time and many other. Then router send traceroute Request to the
next-hop (out to Input Interface for SPT or shared tree) and each hop add
same data to the packet. This packet extend as unicasts. At the end
first-hop
router send IGMP Response to the requestor.

mtrace shows not all information. Very impressive drawing you can view from
"mstat".

> Hello group,
>
> Can someone point me to a link that has a good explanation of how the
> mtrace command works? Or perhaps explain how it works hop by hop?
>
> Thanks
>
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-- 
Ivan


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