3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring an IPv6 Multicast Group Policy 663
Configuring Maximum
Multicast Groups that
Can Pass Ports
By configuring the maximum number of IPv6 multicast groups that can pass a port
or a group of ports, you can limit the maximum number of multicast programs
available to users, thus to control the traffic on the port.
Follow these steps configure the maximum number of IPv6 multicast groups that
can pass a port or a group of ports:
n
■ When the number of IPv6 multicast groups a port has joined reaches the
maximum number configured, the system deletes this port from all the related
MLD Snooping forwarding entries, and hosts on this port need to join IPv6
multicast groups again.
■ If you have configured a port to be as static member port or enabled the
function of simulating a member host on a port, the system deletes this port
from all the related MLD Snooping forwarding entries and applies the new
configurations, until the number of IPv6 multicast groups the has joined
reaches the maximum number configured.
Configuring IPv6
Multicast Group
Replacement
For some special reasons, the number of IPv6 multicast groups passing through a
switch or Ethernet 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. To address this situation, you can enable the IPv6 multicast group
replacement function on the switch or certain Ethernet ports. When the number
of IPv6 multicast groups a switch or an Ethernet port has joined exceeds the limit.
■ If the IPv6 multicast group replacement is enabled, the newly joined IPv6
multicast group automatically replaces an existing IPv6 multicast group with
the lowest IPv6 address.
■ If the IPv6 multicast group replacement is not enabled, new MLD reports will
be automatically discarded.
Configuring IPv6 multicast group replacement globally
Follow these steps to configure IPv6 multicast group replacement globally:
To do... Use the command... Remarks
Enter system view system-view -
Enter the
corresponding
view
Enter Ethernet
interface view
interface interface-type
interface-number
Use either command
Enter port group
view
port-group { manual
port-group-name |
aggregation agg-id }
Configure the maximum number of
IPv6 multicast groups that can pass
the port(s)
mld-snooping
group-limit limit [ vlan
vlan-list ]
Optional
1,024 by default.
To do... Use the command... Remarks
Enter system view system-view -
Enter MLD Snooping view mld-snooping -
Configure IPv6 multicast
group replacement
overflow-replace [ vlan
vlan-list ]
Required
Disabled by default