[j-nsp] igmp snooping layer 2 querier breaks ospf in other devices

[Aaron Gould]

thanks for this... i think i misunderstood the use of l2-querier from a 
previous project i worked on, and put it here where i really didn't need 
it.  moving forward i will only use igmp snooping in the vlan, and not 
the l2-querier option.  but with all that said, i still don't understand 
why ospf inside an l2circuit is affected by my pim/igmp configs ... 
furthermore, why it breaks in the field and works in the lab


-Aaron


On 2/2/2024 10:32 AM, Crist Clark wrote:
> I thought this was asked, but don’t recall an answer, what’s the point 
> of turning on a querier if the switch is already a PIM router? You 
> don’t need an IGMP snooping querier if it’s a multicast router.
>
>
> On Fri, Feb 2, 2024 at 8:21 AM Aaron Gould via juniper-nsp 
> <juniper-nsp at puck.nether.net> wrote:
>
>     I tried to recreate the scenario in my lab with no success
>
>     21.2R3-S4.8 - in lab - problem not seen
>     20.2R3-S7.3 - in lab - problem not seen
>     19.2R3-S6.1 - in lab - problem not seen
>     18.3R3-S6.1 - in lab - problem not seen
>     17.4R2-S11  - in lab - problem not seen
>
>     17.4R2-S11  - in field - problem seen
>
>
>     again, the problem is, when i enabled this command...
>
>     set protocols igmp-snooping vlan vlan100 l2-querier source-address
>     10.100.4.1
>
>     ...a customer riding an l2circuit on ge-0/0/2 report to me that their
>     multicast stops working... ospf goes down and stays in INIT...
>
>     when i remove all pim and igmp, then there OSPF neighbors up and
>     stabilizes
>
>     i just don't know how running igmp inside vlan 100 with ports
>     ge-0/0/4,
>     5 and 6 would have anything to do with an l2circuit on ge-0/0/2
>
>
>     -Aaron
>
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-- 
-Aaron