H3C Technologies H3C S12500 Series Switches - Manual (Page 39)

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Enabling IGMP snooping fast-leave processing globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IGMP-snooping view. igmp-snooping N/A
3. Enable IGMP snooping
fast-leave processing.
fast-leave [ vlan vlan-list ] Disabled by default.
Enabling IGMP snooping fast-leave processing on a port
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view, or
enter port group view.
• Enter Layer 2 Ethernet interface view or
Layer 2 aggregate interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual port-group-name
Use either method.
3. Enable IGMP snooping
fast-leave processing on a
port.
igmp-snooping fast-leave [ vlan vlan-list ] Disabled by default.
Disabling a port from becoming a dynamic router port
The following problems exist in a multicast access network:
• After receiving an IGMP general query or a PIM hello message from a connected host, a router port
becomes a dynamic router port. Before its timer expires, this dynamic router port will receive all
multicast packets within the VLAN to which it belongs and forward them to the host, thus affecting
normal multicast reception of the host.
• In addition, the IGMP general query or PIM hello message sent from the host affects the multicast
routing protocol state on Layer 3 devices, such as the IGMP querier or DR election, and might
further cause network interruption.
To solve these problems, you can disable the router port from becoming a dynamic router port after
receiving an IGMP general query or a PIM hello message, so as to enhance network security and the
control over multicast users.
To disable a port from becoming a dynamic router port:
Step Command Remarks
1. Enter system view. system-view N/A