3com 8807 Guia Do Utilizador
IGMP Snooping Configuration
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CAUTION:
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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.
not configured with a rule, a host is still allowed to join any multicast group.
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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.
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.
Enabling/Disabling IGMP
Snooping Fast Leave
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.
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.
For detailed configuration, refer to the 3Com Switch 8800 Family Series Routing
Switches Command Manual.
Switches Command Manual.
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Fast leave configurations that are configured in system view and Ethernet port
view operate separately.
view operate separately.
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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.
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.
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CAUTION:
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Fast leave configured for a port takes effect only when the VLAN it belongs to
is IGMP Snooping-enabled.
is IGMP Snooping-enabled.
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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.
the port does not belongs to any of the specified VLANs, or the VLANs do not
have IGMP Snooping enabled.
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A newly configured IGMP Snooping clears all existing fast leave configurations.
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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 globally. (You can execute the igmp-snooping enable
command in system view to enable IGMP Snooping globally.)
Table 417 Enable/Disable IGMP Snooping fast leave
Operation
Command
Remarks
Enter system view
system-view
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Enable IGMP Snooping fast
leave in system view
leave in system view
igmp-snooping fast-leave [
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
IGMP Snooping fast leave is
disabled by default.
disabled by default.
Enter Ethernet port view
interface interface-type
interface-number
interface-number
-
Enable IGMP Snooping fast
leave in Ethernet port view
leave in Ethernet port view
igmp-snooping fast-leave [
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
vlan { vlan-id [ to vlan-id ] }
&<1-10> ]
IGMP Snooping fast leave is
disabled by default.
disabled by default.
Disable IGMP Snooping fast
leave
leave
undo igmp-snooping
fast-leave [ vlan { vlan-id [ to
vlan-id ] } &<1-10> ]
fast-leave [ vlan { vlan-id [ to
vlan-id ] } &<1-10> ]
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