3Com Switch 7750 Series
Command Reference Guide – Multicast Chapter 1 IGMP Snooping Configuration Commands
1-6
If this command is executed, when receiving an IGMP Leave packet, IGMP Snooping
removes the port from the multicast group directly. When the port has only one user,
enabling IGMP fast leave processing can save bandwidth.
Note:
z This feature is effective for IGMP-V2-enabled clients.
z When this feature is enabled, if one of the multiple users on a port leaves, the
multicast services for the other users in the same multicast group may be
interrupted.
Example
# Enable IGMP fast leave processing on Ethernet1/0/1 port.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] interface Ethernet 1/0/1
[3Com-Ethernet1/0/1] igmp-snooping fast-leave
1.1.7 igmp-snooping group-limit Syntax
igmp-snooping group-limit limit [ vlan vlan-list [ overflow-replace ] |
overflow-replace ]
undo igmp-snooping group-limit [ vlan vlan-list ]
View
Ethernet port view
Parameter
limit: Maximum number of multicast groups the port can join, in the range of 1 to 256.
overflow-replace: Allows a new multicast group to replace an old multicast group or
old multicast groups. If this keyword is not provided in the specified VLAN, all multicast
groups are replaced by default. If this keyword is provided in the specified VLAN, the
multicast group with the smallest IP address is replaced preferentially.
vlan-list: Multiple VLANs in the form of vlan-list = { vlan-id [ to vlan-id ] } & < 1-10 >. The
vlan-id argument is the ID of the VLAN, in the range of 1 to 4,094. &<1-10> means that
you can provide the argument repeatedly for up to ten times.