3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册
产品代码
3CR17341-91-ME
204
C
HAPTER
16: IGMP S
NOOPING
C
ONFIGURATION
Configuring the
Maximum Number of
Multicast Groups on a
Port
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.
port, you can limit the number of multicast programs on-demand available to
users, thus to regulate traffic on the port.
n
■
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.
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.
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.
Configuring Static
Member Port for a
Multicast Group
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.
group, you can configure that port as a static member port for that multicast
group.
Table 153 Configure the maximum number of multicast groups on a port
Operation
Command
Remarks
Enter system view
system-view
-
Enter Ethernet port view
interface interface-type
interface-number
interface-number
-
Configure the maximum number
of multicast groups allowed on
the port
of multicast groups allowed on
the port
igmp-snooping group-limit
limit [ vlan vlan-list [
overflow-replace ] ]
limit [ vlan vlan-list [
overflow-replace ] ]
Required
default value is 128