Netgear XCM8810 Chassis User Manual - Page 749

NETGEAR 8800 User Manual Basic MVR Deployment Since MVR is primarily targeted for IPTV and similar applications, a basic deployment for that application is shown in Figure 89. In the figure, an IPTV server is connected through a router to a network of switches. Switch 1 has three customer VLANs, Vlan2, Vlan3, and Vlan4. The multicast streams are delivered through the network core (Metro Ethernets), which often use a ring topology and some kind of redundant protection to provide high availability. For example, McastVlan forms a ring through switches Switch1 through Switch4. The link from Switch2 to Switch4 is shown as blocked, as it would be if some form of protection (such as STP) is used. IPTV server McastVlan Switch3 Switch4 Switch2 McastVlan Vlan2 McastVlan Switch1 Vlan4 Vlan3 McastVlan H2 H3 H4 Figure 89. Basic MVR Deployment EX_143 Without MVR, there are two ways to distribute multicast streams in this topology: • Extend subscriber VLANs (Vlan2, Vlan3, and Vlan4) to the network core, by tagging the ports connecting the switches. • Configure all VLANS with an IP address and run PIM or DVMRP on each switch. There are problems with both of these approaches. In the first approach, multiple copies of the same stream (IPTV channel) would be transmitted in the core, wasting bandwidth. In the second approach, all switches in the network core would have to be Layer 3 multicast aware, and would have to run a multicast protocol. Typical network cores are Layer 2 only. MVR provides a simple solution to this problem. If McastVlan in Switch1 is configured with MVR, it leaks the traffic into the local subscriber VLANs that contain hosts that request the traffic. For simple cases, perform these configuration steps: Chapter 27. Multicast Routing and Switching | 749