3Com Switch 7750 Series
Command Reference Guide – Multicast Chapter 1 IGMP Snooping Configuration Commands
1-7
Description
Use the igmp-snooping group-limit command to define the maximum number of
multicast groups the port can join.
Use the undo igmp-snooping group-limit command to restore the default setting.
By default, there is no limit on the number of multicast groups the port can join.
Example
# Allow the GigabitEthernet1/0/1 port to join at most 200 multicast groups.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] interface GigabitEthernet 1/0/1
[3Com-GigabitEthernet1/0/1] igmp-snooping group-limit 200
1.1.8 igmp-snooping group-policy Syntax
igmp-snooping group-policy acl-number [ vlan vlan-list ]
undo igmp-snooping group-policy [ vlan vlan-list ]
View
System view, Ethernet port view
Parameter
acl-number: Basic ACL number, in the range of 2000 to 2999.
vlan-id: ID of the VLAN for the Ethernet port, in the range of 1 to 4094.
Description
Use the igmp-snooping group-policy command to configure an IGMP Snooping
filtering ACL.
Use the undo igmp-snooping group-policy command to remove the IGMP Snooping
filtering ACL.
By default, no IGMP Snooping filtering ACL is configured.
You can configure multicast filtering ACLs globally or on the switch ports connected to
user ends so as to use the IGMP Snooping filter function to limit the multicast streams
that the users can access. With this function, you can treat different VoD users in
different ways by allowing them to access the multicast streams in different multicast
groups.
In practice, when a user orders a multicast program, an IGMP host report message is
generated. When the message arrives at the switch, the switch examines the multicast