3Com Switch 8800 Configuration Guide Chapter 25 Multicast VLAN Configuration
25-1
Chapter 25 Multicast VLAN Configuration 25.1 Multicast VLAN Overview
Based on the current multicast on demand, when users in different VLANs request the
service, multicast flow is duplicated in each VLAN and a great deal of bandwidth is
wasted. To solve this problem, we provide the multicast VLAN feature. With this feature,
you can add switch ports to a multicast VLAN and enable IGMP Snooping to allow
users in different VLANs to share the same multicast VLAN. In this way, multicast flow
is transmitted in one multicast VLAN instead of multiple user VLANs and bandwidth is
greatly saved. Multicast VLAN is isolated from user VLANs, this guarantees both
security and enough bandwidth. After you configure the multicast VLAN, multicast
information flow can be transmitted to users continuously.
25.2 Multicast VLAN Configuration
Multicast VLAN is based on layer 2 multicast. The following table describes the
multicast VLAN configuration tasks:
Table 25-1 Configure multicast VLAN for a layer 2 switch
Item Command Description
Enter system view system-view —
Enable IGMP
Snooping in system
view igmp-snooping enable Required
Enter VLAN view vlan x x: Vlan ID.
IGMP Snooping is
enabled on the VLAN
Enable IGMP
Snooping in VLAN
view
igmp-snooping enable Required
Enable multicast
VLAN service-type multicast Required
Quit VLAN view quit
Enter the view of the
Ethernet port
connected to the
user
interface interface_type
interface_num
interface_type
interface_num: port type
and number.
Define the port type
to hybrid port link-type hybrid Required