mulicast flooding with igmp-snooping enabled ?

[chipitsine1]

we are running many windows2008r2 NLB clusters in "igmp multicast" mode, igmp snooping is enabled on 3com 5500G-EI, all groups are discovered, however there still flooding (multicast traffic is sent to all ports), what can it be ?

display igmp-snooping group


  Total 6 IP Group(s).


  Total 6 MAC Group(s).





  Vlan(id):1.


    Total 6 IP Group(s).


    Total 6 MAC Group(s).


    Static Router port(s):





    Dynamic Router port(s):





    IP group(s):the following ip group(s) match to one mac group.


        IP group address:239.255.7.100


        Static host port(s):


        Dynamic host port(s):


                     GigabitEthernet3/0/4        GigabitEthernet3/0/5


                     GigabitEthernet3/0/6


    MAC group(s):


        MAC group address:0100-5e7f-0764


        Host port(s):GigabitEthernet3/0/4        GigabitEthernet3/0/5


                     GigabitEthernet3/0/6


    IP group(s):the following ip group(s) match to one mac group.


        IP group address:239.255.7.112


        Static host port(s):


        Dynamic host port(s):


 

[chipitsine1]

up

[johnk3r]

I'm having the same problem.

[mertdemi]

Hi can you try

igmp-snooping drop-unknown

under the vlan which you enabled igmp snooping

Kind Regards

[johnk3r]

Had already tested this configuration, not worked ...

[Apachez-]

Does this happen to other multicast-sources aswell or just the "multicast" which microsoft windows elb uses?

Im thinking because microsoft is known to ignore rfc's (just like cisco) and want the world to adopt to their f**kups instead.