40 MULTICAST VLAN CONFIGURATIONMulticast VLANOverviewBased on the current multicast on demand, when users in different VLANs requestthe service, multicast flow is duplicated in each VLAN and thus a great deal ofbandwidth is wasted. To solve this problem, we provide the multicast VLANfeature. With this feature, you can add switch ports to a multicast VLAN andenable IGMP Snooping to allow users in different VLANs to share the samemulticast VLAN. In this way, multicast flow is transmitted in one multicast VLANinstead of multiple user VLANs and bandwidth is greatly saved.As multicast VLAN is isolated from user VLANs, this guarantees both security andenough bandwidth. After you configure the multicast VLAN, multicast informationflow can be transmitted to users continuously.Multicast VLANConfigurationMulticast VLAN is based on layer 2 multicast. The following table describes themulticast VLAN configuration tasks:n ■ A port can only belong to one multicast VLAN.■ The type of the ports connected to user terminals must be hybrid untagged.■ The current system supports up to three multicast VLANS.Table 421 Configure multicast VLANItem Command RemarksEnter system view system-view -Enable IGMP Snooping insystem view igmp-snooping enable RequiredEnter VLAN view vlan vlan-id -IGMP Snooping is enabled onthe VLANEnable IGMP Snooping inVLAN viewigmp-snooping enable RequiredEnable multicast VLAN service-type multicast RequiredQuit VLAN view quitEnter the view of the Ethernetport connected to the userinterface interface-typeinterface-number -Define the port type to hybrid port link-type hybrid RequiredAdd ports to correspondingVLANsport hybrid vlan vlan-id-listuntagged Required
