3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 25  Multicast VLAN Configuration 

 

25-1 

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. 

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 

Enter system view 

— 

Enable IGMP 
Snooping in system 
view 

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_num 

 interface_type 
interface_num: port type 
and number. 

Define the port type 
to hybrid 

port link-type hybrid 

Required