Summary
The multicast routing protocols you’re most likely to use in Linux are MOSPF, DVMRP, and either PIM-SM or PIM-DM. MOSPF is most useful in smaller multicast setups where you need a single protocol to handle both unicast and multicast, and RIP-2 doesn’t really handle multicast data as much as it does multicast updates. DVMRP, PIM-SM, and PIM-DM all require an additional unicast protocol to work with.You would use PIM-SM if your multicast group members tend to be very spread out, and you’d use PIM-DM or DVMRP if they are more densely packed.
Table 2.1 outlines the multicast protocols available to you and the data you’ll need to get started.
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