3Com S7906E - Switch, Configuration Manual

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On an MLD snooping proxy, MLD membership reports are suppressed if the entries for the
corresponding groups exist in the forwarding table, no matter the suppression function is enabled or
not.
Configuring Maximum Multicast Groups that Can Be Joined on a Port
By configuring the maximum number of IPv6 multicast groups that can be joined on a port or a group of
ports, you can limit the number of multicast programs available to VOD users, thus to control the traffic
on the port.
Follow these steps configure the maximum number of IPv6 multicast groups that can be joined on a port
or a group of ports:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type
interface-number
Enter Ethernet port/ONU
port/Layer 2 aggregate
interface view or port group
view
port-group manual
port-group-name
Required
Use either approach
Configure the maximum
number of IPv6 multicast
groups that can be joined on a
port
mld-snooping group-limit
limit
[ vlan vlan-list ]
Optional
512 by default.
z
When the number of IPv6 multicast groups that can be joined on a port reaches the maximum
number configured, the system deletes all the forwarding entries persistent to that port from the
MLD snooping forwarding table, and the hosts on this port need to join IPv6 multicast groups again.
z
If you have configured static or simulated joining on a port, however, when the number of IPv6
multicast groups on the port exceeds the configured threshold, the system deletes all the
forwarding entries persistent to that port from the MLD snooping forwarding table and applies the
static or simulated joining again, until the number of IPv6 multicast groups joined by the port comes
back within the configured threshold.
Configuring IPv6 Multicast Group Replacement
For some special reasons, the number of IPv6 multicast groups passing through a switch or port may
exceed the number configured for the switch or the port. In addition, in some specific applications, an
IPv6 multicast group newly joined on the switch needs to replace an existing IPv6 multicast group
automatically. A typical example is “channel switching”, namely, by joining the new multicast group, a
user automatically switches from the current IPv6 multicast group to the new one.