H3C Technologies H3C S12500 Series Switches - Manual (Page 317)

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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. Configure the maximum
number of IPv6 multicast
groups that a port can join.
mld-snooping group-limit limit
[ vlan vlan-list ]
1024 by default.
Enabling IPv6 multicast group replacement
For various reasons, the number of IPv6 multicast groups that a switch or a port can join might exceed the
upper limit. In addition, in some specific applications, an IPv6 multicast group that the switch newly joins
must replace an existing IPv6 multicast group automatically. A typical example is channel switching. To
view a new TV channel, a user switches from the current IPv6 multicast group to the new one.
To realize such requirements, you can enable the IPv6 multicast group replacement function on the switch
or on a certain port. When the number of IPv6 multicast groups that the switch or the port has joined
reaches the limit, one of the following occurs:
• If the IPv6 multicast group replacement feature is disabled, new MLD reports are automatically
discarded.
• If the IPv6 multicast group replacement feature is enabled, the IPv6 multicast group that the switch
or the port newly joins automatically replaces an existing IPv6 multicast group that has the lowest
IPv6 address.
IMPORTANT:
To make the IPv6 multicast group replacement function take effect, configure the maximum number of IPv6
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 IPv6 multicast group replacement.
Enabling IPv6 multicast group replacement globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MLD-snooping view. mld-snooping N/A
3. Enable IPv6 multicast group
replacement.
overflow-replace [ vlan vlan-list ] Disabled by default.
Enabling IPv6 multicast group replacement on a port
Step Command Remarks
1. Enter system view. system-view N/A