3com 8807 Reference Guide
574
C
HAPTER
31: IGMP S
NOOPING
C
ONFIGURATION
C
OMMANDS
n
■
Fast leaves that are configured in system view and Ethernet port view operate
separately.
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., a port operates as a
trunk of multiple VLANs) in the specified VLANs if you configure it in Ethernet
port view.
view. However, it only works on the current port (e.g., a port operates as a
trunk of 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.
is IGMP Snooping-enabled.
■
Fast leave does not work if the corresponding specified VLANs do not exist, the
port does not belongs to any of the specified VLANs, or the VLANs do not have
IGMP Snooping enabled.
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 enable IGMP Snooping globally by executing
the igmp-snooping enable command in system view.)
IGMP Snooping globally. (You can enable IGMP Snooping globally by executing
the igmp-snooping enable command in system view.)
■
When you configure IGMP Snooping fast leave on aggregation ports, the
configuration takes effect only on primary aggregation ports.
configuration takes effect only on primary aggregation ports.
■
If you add an IGMP V1 host of the same multicast group to the port, the switch
does not remove the port when the port receives an IGMP Leave packet of the
multicast group even you enable IGMP Snooping fast leave for the port.
does not remove the port when the port receives an IGMP Leave packet of the
multicast group even you enable IGMP Snooping fast leave for the port.
Fast leave is disabled by default.
Related command: igmp-snooping.
Example
# Enable IGMP Snooping fast leave on the Ethernet2/1/1 port in VLAN 5 only.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] interface Ethernet2/1/1
[3Com-Ethernet2/1/1] igmp-snooping fast-leave vlan 5
# Enable IGMP Snooping fast leave on the Ethernet2/1/1 port in VLAN 5, VLAN 7,
VLAN 8, VLAN 30 through VLAN 40, VLAN 50, VLAN 55, VLAN 60, and VLAN 61.
VLAN 8, VLAN 30 through VLAN 40, VLAN 50, VLAN 55, VLAN 60, and VLAN 61.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] interface Ethernet2/1/1
[3Com-Ethernet2/1/1] igmp-snooping fast-leave vlan 5 7 to 8 30 to 40
50 55 60 to 61
# Enable IGMP Snooping fast leave on the Ethernet2/1/1 port in all VLANs.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800]interface Ethernet2/1/1
[3Com-Ethernet2/1/1] igmp-snooping fast-leave