HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 57
Port-based multicast VLAN,
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Figure 18 Sub-VLAN-based multicast VLAN Multicast packets VLAN 10 (Multicast VLAN) VLAN 2 VLAN 3 VLAN 4 Source Router A IGMP querier Switch A VLAN 2 Receiver Host A VLAN 3 Receiver Host B VLAN 4 Receiver Host C 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 sends only one copy of multicast data to Switch A in the multicast VLAN, and Switch A distributes the data to the multicast VLAN's sub-VLANs that contain receivers. Port-based multicast VLAN As shown in Figure 19, Host A, Host B, and Host C are in 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 VLAN 10, and enable IGMP snooping in the multicast VLAN and all the user VLANs. Figure 19 Port-based multicast VLAN Multicast packets VLAN 10 (Multicast VLAN) VLAN 2 Receiver Host A Source Router A IGMP querier GE1/0/2 GE1/0/1 Switch A GE1/0/3 GE1/0/4 VLAN 3 Receiver Host B VLAN 4 Receiver Host C After the configuration, if Switch A receives an IGMP message on a user port, it tags the message with the multicast VLAN ID and relays it to the IGMP querier, so that IGMP snooping can uniformly manage the router port and member ports in the multicast VLAN. When Router A forwards multicast data to Switch A, it sends only one copy of multicast data to Switch A in the multicast VLAN, and Switch A distributes the data to all the member ports in the multicast VLAN. 46
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