Configuring Multicast Vlan - 3Com 5500-SI Configuration Manual

320 C 18: M
HAPTER ULTICAST
Configuring Multicast
VLAN
P
ROTOCOL
Table 316 Configure the maximum number of multicast groups on a port (continued)
Operation
Configure the maximum
number of multicast groups
the port can join.
In old multicast mode, when users in different VLANs order the same multicast group,
the multicast stream is copied to each of the VLANs. This mode wastes a lot of
bandwidth.
By configuring a multicast VLAN, adding switch ports to the multicast VLAN and
enabling IGMP Snooping, you can make users in different VLANs share the same
multicast VLAN. This saves bandwidth since multicast streams are transmitted only
within the multicast VLAN, and also guarantees security because the multicast VLAN
is isolated from user VLANs.
Multicast VLAN is mainly used in Layer 2 switching, but you must make corresponding
configuration on the Layer 3 switch.
Table 317 describes the configuration tasks for multicast VLAN.
Table 317 Configure multicast VLAN on Layer 3 switch
Operation
Enter system view
Create a VLAN and enter the
VLAN view
Exit the VLAN view
Create a VLAN interface and
enter the VLAN interface view
Enable IGMP
Exit the VLAN interface view
Enter the view of the Ethernet
port connected to the Layer 2
switch
Define the port as a trunk or
hybrid port
Set the VLAN IDs allowed to
pass through the Ethernet
Table 318 Configure multicast VLAN on Layer 2 switch
Operation
Enter system view
Enable IGMP Snooping globally igmp-snooping enable
Enter VLAN view
Enable IGMP Snooping on the
VLAN
Command
igmp-snooping group-limit [
vlan vlan-list |
overflow-replace ]
Command
system-view
vlan vlan-id
quit
interface vlan-interface
vlan-id
igmp enable
quit
interface interface-type
interface-num
port link-type { trunk |
hybrid }
port hybrid vlan vlan-id-list {
tagged | untagged }
port trunk pvid vlan vlan-id
Command
system-view
vlan vlan-id
igmp-snooping enable
Description
Required
By default, there is no limit on
the number of the multicast
groups the port can join.
Description
—
vlan-id is a VLAN ID.
—
—
Required
—
—
Required
Required
The multicast VLAN defined on
the Layer 2 switch must be
included and set as tagged.
Description
—
Required
vlan-id is a VLAN ID.
Required