3com S7906E 安装指导
1-2
Sub-VLAN-based multicast VLAN
As shown in
, Host A, Host B and Host C are in three different user VLANs. On Switch A,
configure VLAN 10 as a multicast VLAN, configure all the user VLANs as sub-VLANs of this multicast
VLAN, and enable IGMP Snooping in the multicast VLAN.
Figure 1-2 Sub-VLAN-based multicast VLAN
Source
Router A
IGMP querier
VLAN 2
VLAN 3
VLAN 4
Switch A
Receiver
Host A
Receiver
Host B
Receiver
Host C
Multicast packets
VLAN 2
VLAN 3
VLAN 4
VLAN 10 (Multicast VLAN)
After the configuration, IGMP Snooping manages router ports in the multicast VLAN and member ports
in the sub-VLANs. When forwarding multicast data to Switch A, Router A needs to send only one copy
of multicast traffic to Switch A in the multicast VLAN, and Switch A distributes the traffic to the multicast
VLAN’s sub-VLANs that contain receivers.
Port-based multicast VLAN
, Host A, Host B and Host C are in three different user VLANs. All the user ports
(ports with attached hosts) on Switch A are hybrid ports. On Switch A, configure VLAN 10 as a multicast
VLAN, assign all the user ports to this multicast VLAN, and enable IGMP Snooping in the multicast
VLAN and all the user VLANs.
Figure 1-3 Port-based multicast VLAN