H3C Technologies H3C S12500 Series Switches - Manual (Page 46)

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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. Set the maximum number of
multicast groups that the port
can join.
igmp-snooping group-limit limit
[ vlan vlan-list ]
1024 by default.
Enabling multicast group replacement
For various reasons, the number of multicast groups that the switch or a port joins might exceed the upper
limit. In addition, in some specific applications, a multicast group that the switch 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 realize such requirements, you can enable the multicast group replacement function on the switch or
on a certain port. When the number of multicast groups that the switch or on the port has joined reaches
the limit, one of the following occurs:
• If the multicast group replacement feature is disabled, new IGMP reports are automatically
discarded.
• If the multicast group replacement feature is enabled, the multicast group that the switch or the port
newly joins automatically replaces an existing multicast group that has the lowest address.
IMPORTANT:
•
To make the multicast group replacement function take effect, configure the maximum number of
multicast groups that a port can join to a value other than the default one (see "
Setting the maximum
number of multicast groups that a port can join ") before enabling multicast group replacement.
• Static multicast groups cannot be replaced.
Enabling 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.
Enabling multicast group replacement on a port
Step Command Remarks
1. Enter system view. system-view N/A