3Com 4210 PWR Configuration Manual page 206

204 C 16: IGMP S
HAPTER
Configuring the
Maximum Number of
Multicast Groups on a
Port
n
Configuring Static
Member Port for a
Multicast Group
C
NOOPING ONFIGURATION
By configuring the maximum number of multicast groups that can be joined on a
port, you can limit the number of multicast programs on-demand available to
users, thus to regulate traffic on the port.
Table 153 Configure the maximum number of multicast groups on a port
Operation
Enter system view
Enter Ethernet port view
Configure the maximum number
of multicast groups allowed on
the port
To prevent bursting traffic in the network or performance deterioration of the
■
device caused by excessive multicast groups, you can set the maximum number
of multicast groups that the switch should process.
When the number of multicast groups exceeds the configured limit, the switch
■
removes its multicast forwarding entries starting from the oldest one. In this
case, the multicast packets for the removed multicast group(s) will be flooded
in the VLAN as unknown multicast packets. As a result, non-member ports can
receive multicast packets within a period of time. To avoid this from happening,
enable the function of dropping unknown multicast packets.
If the host connected to a port is interested in the multicast data for a specific
group, you can configure that port as a static member port for that multicast
group.
Command
system-view
interface interface-type
interface-number
igmp-snooping group-limit
limit [ vlan vlan-list [
overflow-replace ] ]
Remarks
-
-
Required
default value is 128