3Com 8807 Configuration Manual page 425

Enabling/Disabling IGMP
Snooping Fast Leave
c
CAUTION:
If an inexistent acl-number is bound to the VLAN, or if the bound acl-number is
■
not configured with a rule, a host is still allowed to join any multicast group.
If no acl-number exists, you can also configure the filtering rule of multicast
■
groups in VLAN view. That is, this rule is not restricted by the ACL itself, and is
valid for all members in the specified VLAN.
An IGMP Snooping-enabled Layer 2 switch directly removes a fast leave-enabled
port from the list of member ports of the multicast group when the port receives a
leave packet. That is, the switch removes the port from the multicast group
without forwarding the multicast data, or sending the specific group query
messages to the port,, or enabling response query timer to the port.
Table 417 Enable/Disable IGMP Snooping fast leave
Operation
Enter system view
Enable IGMP Snooping fast
leave in system view
Enter Ethernet port view
Enable IGMP Snooping fast
leave in Ethernet port view
Disable IGMP Snooping fast
leave
For detailed configuration, refer to the 3Com Switch 8800 Family Series Routing
Switches Command Manual.
n
Fast leave configurations that are configured in system view and Ethernet port
■
view operate separately.
Fast leave works on all ports of the specified VLANs if you configure it in system
■
view. However, it only works on the current port (e.g., when a Trunk port
belongs to multiple VLANs) in the specified VLANs if you configure it in
Ethernet port view.
c
CAUTION:
Fast leave configured for a port takes effect only when the VLAN it belongs to
■
is IGMP Snooping-enabled.
Fast leave does not work if the corresponding specified VLANs do not exists,
■
the port does not belongs to any of the specified VLANs, or the VLANs do not
have IGMP Snooping enabled.
A newly configured IGMP Snooping clears all existing fast leave configurations.
■
The igmp-snooping fast-leave command is useless if you do not enable
■
IGMP Snooping globally. (You can execute the igmp-snooping enable
command in system view to enable IGMP Snooping globally.)
IGMP Snooping Configuration
Command
system-view
igmp-snooping fast-leave [
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
interface interface-type
interface-number
igmp-snooping fast-leave [
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
undo igmp-snooping
fast-leave [ vlan { vlan-id [ to
vlan-id ] } &<1-10> ]
425
Remarks
-
IGMP Snooping fast leave is
disabled by default.
-
IGMP Snooping fast leave is
disabled by default.
-