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

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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