From: Ivan (ivan@iip.net)
Date: Fri Jul 21 2006 - 04:46:41 ART
Suppose topology is calculated and stable.
mtrace has three parameters
1) last-hop router
2) up to wich router trace must reach
3) multicast group
for example
mtrace R1 R5 224.1.2.3
Requestor seng IGMP-Request to R1, R1 record some parameters and send as
unicast to R3 .... the same manner up to R5. R5 is last router for mtrace
command send IGMP Response to Requestor. IGMP-Response contain all collected
information. Last step in this is output result
................
mtrace from R1 to R5 for group 224.1.2.3
0 R1 (IP)
-1 R3 (IP)
-2 R5 (IP)
Note: hop numbers is negative such as reverse direction.
just my 2 cent
> 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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