Netgear XCM8810 Chassis User Manual - Page 751
MVR Forwarding, Dynamic MVR, Configuring Static and Dynamic MVR
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NETGEAR 8800 User Manual If a multicast packet for a group in the static MVR range is received on an MVR enabled VLAN, it is always flooded on the MVR VLAN. This allows the neighbor switch in the ring to receive all the static MVR streams. Dynamic MVR In contrast, since a video content provider would like to provide a variety of on-demand and other premium channels, there are often many lower demand (fewer viewers) premium channels that cannot all be made available simultaneously at the core network. These should be streamed from the router only if requested by a host. IGMP is the standard method used by a host to request a stream. However, IGMP packets are constrained to a VLAN. Thus, subscribers' IGMP join requests on the VLAN cannot be forwarded onto other VLANS. With MVR, a VLAN sends proxy IGMP join messages on behalf of all the subscriber VLANs on the switch. Thus, in Figure 89, McastVlan sends join and leave messages on behalf of Vlan2, Vlan3, and Vlan4. The router receives the messages on McastVlan and streams corresponding channels onto the core network. This provides on-demand service, and an administrator doesn't need to configure static IGMP on the router for each of these channels. Configuring Static and Dynamic MVR By default, all MVR streams are static. You can specify which groups are static by using the following command: configure mvr vlan static group { | none} Any other groups in the MVR address range are dynamic. You can specify the MVR address range by using the following command: configure mvr vlan mvr-address { | none} By using these two commands together, you can specify which groups are static and which are dynamic. If you want all the groups to be dynamic, specify a policy file for the static group command that denies all multicast addresses. MVR Forwarding The goal for MVR is to limit the multicast traffic in the core Layer 2 network to only the designated multicast VLAN. If the backbone Layer 2 port is tagged with multiple VLANs, as shown in Figure 90, a set of rules is needed to restrict the multicast streams to only one VLAN in the core. Chapter 27. Multicast Routing and Switching | 751
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