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

[Pavel Dimow]

Hi Phil,

my understanding is that when not using PIM (because this is a single
switch and beside that have SMI software without PIM support) the
switch will become querier. Which is fine, but as soon as it hears PIM
hello message
on any interface it will "designate" that interface as the one where
is connected multicast router and will immediately
forward all streams to that port, which in my case is not desired
action. I tried to filter all pim messages with ACL but
I think thats irrelevant as IGMP snooping comes into the play well before ACL.

Am I right? :)

On Tue, Oct 26, 2010 at 12:15 PM, Pavel Dimow <paveldimow at gmail.com> wrote:
> Hi Roman,
>
> Already tried, but with no success, because I am not sure what to
> enter as mrouter port considering fact that in normal scenario mrouter
> is the switch itself.
>
> On Mon, Oct 25, 2010 at 8:51 PM, Roman A. Nozdrin <drrtuy at ya.ru> wrote:
>> Dear Pavel,
>>
>>> 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.
>>
>> It seems that Cisco switches lack of the forbidden mrouter interface
>> command.
>>
>>> Thanks in advance for any help/tips
>>
>> You can try access-list at an interface which rejects "all hosts"
>> destination traffic.
>> There is also a tricky way. You can switch mrouter learning mode at the
>> switch to CGMP and put some particular interfaces into a static mrouter
>> mode. I'm sure CPE doesn't use CGMP.
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>