[c-nsp] Preventing host with lower ip to become IGMP querier

Pavel Dimow paveldimow at gmail.com
Mon Oct 25 12:42:14 EDT 2010


Hello Dale,

ip pim dr-priority is the "L3 command". Which I dont have turned on,
just plain igmp snooping on
per VLAN basic on the 3560. The problem manifest when some device is
connected to a port in
that VLAN and simply becomes mrouter for that VLAN, which causes that
it can receive all multicast
traffic.

On Mon, Oct 25, 2010 at 6:01 PM, Dale W. Carder <dwcarder at wisc.edu> wrote:
> Hi Pavel,
>
> I know that you can force which router will become the DR for the
> network with the "ip pim dr-priority" command, otherwise the highest
> ip address wins the election.  Does that change which router becomes the
> querier?
>
> Dale
>
>
> Thus spake Pavel Dimow (paveldimow at gmail.com) on Mon, Oct 25, 2010 at 03:17:35PM +0200:
>> Hello,
>>
>> I have some strange situation (not that I really understand how it
>> works), but I want to prevent device connected to a port to become
>> IGMP querier because
>> it has a lower ip address. I have also made sure to configure profile
>> in order to prevent it for receiving (joining) any multicast groups
>> but all mcast traffic goes to this
>> port also. I don't have management on that device.
>>
>> Thanks in advance for any help/tips
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