3Com Switch 4800G 24-Port Configuration Manual page 594

594 C 43: MLD S
HAPTER
Configuring Maximum
Multicast Groups that
that Can Be Joined on a
Port
n
Configuring IPv6
Multicast Group
Replacement
C
NOOPING ONFIGURATION
To do...
Enter system view
Enter MLD Snooping view
Enable MLD report
suppression
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...
Enter system view
Enter the
corresponding view
Configure the maximum number of
IPv6 multicast groups that can be
joined on a port
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.
If you have configured static or simulated joins 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 joins again,
until the number of IPv6 multicast groups joined by the port comes back within
the configured threshold.
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, a
user automatically switches from the current IPv6 multicast group to the one.
To address this situation, you can enable the IPv6 multicast group replacement
function on the switch or certain ports. When the number of IPv6 multicast groups
a switch or a 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.
Use the command...
system-view
mld-snooping
report-aggregation
Use the command...
system-view
Enter Ethernet interface interface-type
port view interface-number
Enter port port-group { manual
group view port-group-name |
aggregation agg-id }
mld-snooping
group-limit limit [ vlan
vlan-list ]
Remarks
-
-
Optional
Enabled by default
Remarks
-
Use either command
Optional
The default is 512.