Netgear XSM4324FS Software Administration Manual Software Version 12.x - Page 302
Multicast VLAN Registration
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M4300 Series and M4300-96X Fully Managed Switches Multicast VLAN Registration The IGMP Layer 3 protocol is widely used for IPv4 network multicasting. In Layer 2 networks, the IGMP protocol uses resources inefficiently. For example, a Layer 2 switch multicast traffic to all ports even if there are receivers connected to only a few ports. To fix this problem, the IGMP snooping protocol was developed. But the problem reappears when receivers are in different VLANs. Multicast VLAN registration (MVR) is intended to solve the problem of receivers in different VLANs. It uses a dedicated manually configured VLAN, called the multicast VLAN, to forward multicast traffic over Layer 2 network in conjunction with IGMP snooping. MVR, like the IGMP Snooping protocol, allows a Layer 2 switch to snoop on the IGMP control protocol. Both protocols operate independently of each other. Both protocols can be enabled on the switch interfaces at the same time. In such a case, MVR listens to the join and report messages only for groups configured statically. All other groups are managed by IGMP snooping. There are two types of MVR ports: source and receiver. • The source port is the port to which the multicast traffic flows using the multicast VLAN. • The receiver port is the port where a listening host is connected to the switch. It can utilize any (or no) VLAN, except the multicast VLAN. This implies that the MVR switch performs VLAN tag substitution from the multicast VLAN source port to the VLAN tag used by the receiver port. The multicast VLAN is the VLAN that you configure in the specific network for MVR purposes. The multicast VLAN is used to transfer multicast traffic over the network to avoid duplication of multicast streams for clients in different VLANs. The operator must configure the multicast VLAN manually for all source ports in the network. A diagram of a network configured for MVR is shown in the following illustration. SP is the source port and RP is the receiver port. MVR 302 Software Administration Manual
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