Re: igmp querier , assert winner and DR confusion on election

thanks Babola ,
sure experts will help ! eagerly waiting for their comments ! just to point
out that DR is ONLY used for Registration and sending IGMP join.

Being DR doesn't mean that it will always be forwarder .

Regards
On Wed, Dec 8, 2010 at 11:29 PM, Bobola Oke <okebobola_at_gmail.com> wrote:

> I highly recommend you study TCP/IP routing vol2. Deff Doyle does a
> fantastic job of explaining these clearly.
>
> For assert elections, the router with the lowest cost to the source always
> wins.
>
> The designated router is the forwarder. (I'm not sure on this... I think I
> need to refer to the book myself :D). The IGMP querier checks if there are
> hosts that want to receive multicast traffic. The forwarder does the
> forwarding :D
>
> If all the cost to reach the source were to be the same. R3 would be the
> designated router (forwarder) and R1 would be the querier. I think the rule
> changes if IGMP version 1 and PIM v1 is being used.
>
> I'm sure the experts can help further on this! Just trying to do my bit...
>
>
>
>
> On Wed, Dec 8, 2010 at 4:54 PM, imran ali <immrccie_at_gmail.com> wrote:
>
> > hi group ,
> >
> > R1 , R2 , R3 are connected on a multiaccess segment sharing ip address
> > from
> > 10.1.123.X /24 subnet where X is the router no .
> >
> > now when it comes to cost R2 is having lowest cost to reach the SOURCE .
> >
> > All the router has equal cost to Rp. igmp ver is 2
> >
> > question :
> >
> > 1) who will be elected as assert forwarder ? DR ? Igmp Querier ?
> >
> > 1) I believe all three roles are seprate or is there any overlap of
> roles?
> >
> > i have read some where that igmp querier is the one who forwards the
> > traffic on LAN but in my case R2 should be
> > the Mcast data forwarder .
> >
> > Regards
> >
> >
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>
> --
> Bobola Oke
>
>
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Received on Thu Dec 09 2010 - 01:32:25 ART