Netgear XCM8806 Chassis User Manual - Page 750
Static and Dynamic MVR, Static MVR
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NETGEAR 8800 User Manual 1. Configure MVR on McastVlan. 2. Configure an IP address and enable IGMP and IGMP snooping on the subscriber VLANs (by default IGMP and IGMP snooping are enabled on NETGEAR switches). 3. For all the multicast streams (IPTV channels), configure static IGMP snooping membership on the router on McastVlan. 4. Enable MVR on the switches in the network. Note: MVR works best with IGMPv1 and IGMPv2. NETGEAR recommends that you do not use MVR with IGMPv3. The strategy above conserves bandwidth in the core and does not require running PIM on the subscriber switches. In this topology, a host (for example, a cable box or desktop PC) joins a channel through an IGMP join message. Switch1 snoops this message and adds the virtual port to the corresponding cache's egress list. This is possible because an MVR enabled VLAN can leak traffic to any other VLAN. When the user switches to another channel, the host sends an IGMP leave for the old channel and a join for the new channel. The corresponding virtual port is removed from the cache for the old channel and is added to the cache for the new channel. As discussed in Static and Dynamic MVR on page 750, McastVlan also proxies IGMP joins learned on other VLANs to the router. On an MVR network it is not mandatory to have a router to serve the multicast stream. All that is required is to have a designated IGMP querier on McastVlan. The IPTV server can also be directly connected to McastVlan. Static and Dynamic MVR This section presents the following topics: • Static MVR on page 750 • Dynamic MVR on page 751 • Configuring Static and Dynamic MVR on page 751 Static MVR In a typical IPTV network, there are several high demand basic channels. At any instant there is at least one viewer for each of these channels (streams), and they should always be available at the core. When a user requests one of these channels, it is quickly pulled locally from the multicast VLAN. These streams are always available on the core multicast VLAN through static configuration on the streaming router. For those channels, the Layer 2 switch does not send any IGMP join messages towards the IGMP querier. These groups must be statically configured on the streaming router so that these streams are always available on the ring. For example, on an NETGEAR router, you can use the following command: configure igmp snooping {vlan} ports add static group 750 | Chapter 27. Multicast Routing and Switching
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