3com WX3000 User Manual

 

2-10 

Enable IGMP Snooping querier   igmp-snooping querier 

Required 

By default, IGMP Snooping 
querier is disabled. 

Configure the interval of 
sending general queries 

igmp-snooping 
query-interval seconds 

Optional 

By default, the interval of 
sending general queries is 60 
seconds. 

Configure the source IP 
address of general queries 

igmp-snooping 
general-query source-ip 
{ current-interface | 
ip-address } 

Optional 

By default, the source IP 
address of general queries is 
0.0.0.0. 

 

With IGMP Snooping enabled in a VLAN, multicast traffic for unknown multicast groups is flooded within 

the VLAN by default. This wastes network bandwidth and affects multicast forwarding efficiency. 

With the unknown multicast flooding suppression function enabled, when receiving a multicast packet 

for an unknown multicast group, an IGMP Snooping device creates a nonflooding entry and relays the 

packet to router ports only, instead of flooding the packet within the VLAN. If the device has no router 

ports, it drops the multicast packet. 

Follow these steps to suppress flooding of unknown multicast traffic in the VLAN: 

To do… 

Use the command… 

Remarks 

Enter system view 

system-view 

— 

Enable unknown multicast 
flooding suppression 

Required 

By default, unknown multicast 
flooding suppression 

 

If the function of dropping unknown multicast packets is enabled, you cannot enable unknown multicast 

flooding suppression. 

 

If the host connected to a port is interested in the multicast data for a specific group, you can configure 

that port as a static member port for that multicast group.