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5324 - IGMP flooding
Hi,
We are using the 5324 switch. We have enabled IGMP snooping, yet when there is no device sending join messages, the traffic is flooded to all the ports. When a join is send, only that port receives the traffic.
How do we configure the switch so that without join messages, all the traffic will be blocked?
We have configured the following:
IGMP Snooping is globaly enabled
IGMP Snooping is enabled on VLAN 1
IGMP host timeout is 60 sec
IGMP Immediate leave is enabled
IGMP mrouter timeout is 70 sec
Automatic learning of multicast router ports is enabled
IGMP Snooping is enabled on VLAN 1
IGMP host timeout is 60 sec
IGMP Immediate leave is enabled
IGMP mrouter timeout is 70 sec
Automatic learning of multicast router ports is enabled
All the ports are on the same VLAN.
We have a querier.
GregG1
2 Intern
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812 Posts
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Posted December 1st, 2005 16:00
I would verify that you have "bridge multicast filtering" enabled on the VLAN, but it sounds like the switch is working as designed. A multicast group with no members is considered an empty group. Since the switch cannot determine if any devices want it, it floods the traffic.
The multicast implementation works great with applications that begin sending traffic only after recognition from the clients that request it (like Ghost or other imaging applications).