Netgear XCM8806 Chassis User Manual - Page 754

NETGEAR 8800 User Manual In the topology above, the MSP multicast VLAN is carried on two switches that also carry the customer multicast VLAN. When multiple switches carry both multicast VLANs, it is imperative that MVR is configured on only one switch. Only that switch should be used as the transit point for multicast streams from one multicast ring into another. Otherwise, duplicate packets are forwarded. Also on the non-MVR switches, the ring ports should be configured as static router ports, so that ring ports are excluded from forwarding packets onto the customer ring. There is no mechanism to elect a designated MVR forwarder, so it must be configured correctly. MVR Configurations MVR enables Layer 2 network installations to deliver bandwidth intensive multicast streams. It is primarily aimed at delivering IPTV over Layer 2 networks, but it is valuable in many existing STP installations. This section explores a few possible deployment scenarios and configuration details. Of course, real world networks can be lot different from these examples. This section is meant to present some ideas on how to deploy MVR over existing networks, as well as to design new networks that support MVR. MVR with STP In a Layer 2 ring topology, MVR works with STP. However, in other Layer 2 topologies, additional configuration steps may be needed to make sure that multicast feeds reach all network segments. Extra configuration is required because all ports in the VLAN are part of an STP domain, so that solely by examining the configuration it is not clear whether a port is part of bigger ring or is just serving a few hosts. Consider a simplified Layer 2 STP network as shown in Figure 92. 754 | Chapter 27. Multicast Routing and Switching