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strange gmp snooping on 3com 5500G-EI

chipitsine1
Advisor

strange gmp snooping on 3com 5500G-EI

we are running MS NLB on Windows 2008r2 in "igmp multicast" mode.



so, windows servers are sending igmp queries to network and commutators are supposed to limit multicast traffic only to subscribed ports. however, 3com 5500G-EI does see igmp groups:



 



<5500G-EI>display igmp-snooping group


  Total 8 IP Group(s).


  Total 8 MAC Group(s).





  Vlan(id):1.


    Total 8 IP Group(s).


    Total 8 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:239.255.6.254


        Static host port(s):


        Dynamic host port(s):


                     GigabitEthernet5/0/5        GigabitEthernet6/0/46      


    MAC group(s):


        MAC group address:0100-5e7f-06fe


        Host port(s):GigabitEthernet5/0/5        GigabitEthernet6/0/46      


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


        IP group address:239.255.7.193


        Static host port(s):


        Dynamic host port(s):


                     GigabitEthernet1/0/29       GigabitEthernet1/0/31      


                     GigabitEthernet1/0/46       GigabitEthernet2/0/3       


  ---- More ----


 



 



 



but it treats multicast traffic as broadcast and sends it to all available ports.



what did we do wrong ?



3 REPLIES
chipitsine1
Advisor

Re: strange gmp snooping on 3com 5500G-EI

we are running MS NLB on Windows 2008r2 in "igmp multicast" mode.



so, windows servers are sending igmp queries to network and commutators are supposed to limit multicast traffic only to subscribed ports. however, 3com 5500G-EI does see igmp groups:



 



<5500G-EI>display igmp-snooping group


  Total 8 IP Group(s).


  Total 8 MAC Group(s).





  Vlan(id):1.


    Total 8 IP Group(s).


    Total 8 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:239.255.6.254


        Static host port(s):


        Dynamic host port(s):


                     GigabitEthernet5/0/5        GigabitEthernet6/0/46      


    MAC group(s):


        MAC group address:0100-5e7f-06fe


        Host port(s):GigabitEthernet5/0/5        GigabitEthernet6/0/46      


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


        IP group address:239.255.7.193


        Static host port(s):


        Dynamic host port(s):


                     GigabitEthernet1/0/29       GigabitEthernet1/0/31      


                     GigabitEthernet1/0/46       GigabitEthernet2/0/3       


  ---- More ----


 



 



 



but it treats multicast traffic as broadcast and sends it to all available ports.



what did we do wrong ?



chipitsine1
Advisor

Re: strange gmp snooping on 3com 5500G-EI

up



chipitsine1
Advisor

Re: strange gmp snooping on 3com 5500G-EI

up