H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 28)

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Step Command Remarks
2. Enter Layer 2 Ethernet
interface view, Layer 2
aggregate interface view, or
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 approach.
3. Set the maximum number of
multicast groups that a port
can join.
igmp-snooping group-limit limit
[ vlan vlan-list ]
256 by default.
Configuring multicast group replacement
The number of multicast groups that the current AC or a port joins might exceed the upper limit. In
addition, in some specific applications, a multicast group that the AC newly joins must replace an
existing multicast group automatically. A typical example is "channel switching": To view a new channel,
a user switches from the current multicast group to the new one.
To address such situations, enable the multicast group replacement function on the AC or a certain port.
When the number of multicast groups that the AC or the port has joined reaches the limit, one of the
following occurs:
• If the multicast group replacement feature is not enabled, new IGMP reports are automatically
discarded.
• If the multicast group replacement feature is enabled, the multicast group that the AC or the port
newly joins automatically replaces an existing multicast group that has the lowest address.
CAUTION:
Be sure to configure the maximum number of multicast groups allowed on a port (see " Setting the
maximum number of multicast groups that a port can join ") before enabling multicast group
replacement. Otherwise, the multicast group replacement functionality does not take effect.
Configuring multicast group replacement globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IGMP-snooping view. igmp-snooping N/A
3. Enable multicast group
replacement.
overflow-replace [ vlan vlan-list ] Disabled by default
Configuring multicast group replacement on a port
Step Command Remarks
1. Enter system view. system-view N/A