3com WX3000 Manuel D’Utilisation

 

2-8 

Follow these steps to configure a multicast group filter in system view: 

Enter system view  

— 

Configure a multicast group 
filter  

igmp-snooping group-policy 
acl-number [ vlan vlan-list ] 

Required 

No group filter is configured by 
default, namely hosts can join 
any multicast group. 

 

Follow these steps to configure a multicast group filter in Ethernet port view: 

Enter system view  

— 

Enter Ethernet port view 

interface interface-type 
interface-number 

— 

Configure a multicast group 
filter 

igmp-snooping group-policy 
acl-number [ vlan vlan-list ] 

Optional 

No group filter is configured by 
default, namely hosts can join 
any multicast group. 

 

z 

A port can belong to multiple VLANs, you can configure only one ACL rule per VLAN on a port. 

z 

If no ACL rule is configured, all the multicast groups will be filtered.  

z 

Since most devices broadcast unknown multicast packets by default, this function is often used 

together with the function of dropping unknown multicast packets to prevent multicast streams from 

being broadcast as unknown multicast packets to a port blocked by this function. 

z 

The configuration performed in system view takes effect on all ports of the device if no VLAN is 

specified; if one or more VLANs are specified, the configuration takes effect on all ports in the 

specified VLAN(s). 

z 

The configuration performed in Ethernet port view takes effect on the port no matter which VLAN it 

belongs to if no VLAN is specified; if one or more VLANs are specified, the configuration takes 

effect on the port only if the port belongs to the specified VLAN(s). 

 

By configuring the maximum number of multicast groups that can be joined on a port, you can limit the 

number of multicast programs on-demand available to users, thus to regulate traffic on the port.