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OSPF Complete Implementation by John T. Moy

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12. MOSPF Implementation

The Multicast Extensions to OSPF, or MOSPF, enable a router to forward IP multicast datagrams. The MOSPF implementation calculates multicast routing table entries and installs them into the system’s kernel through the system interface routine OspfSysCalls::add_mcache() (see Section 4.2). The system kernel installs multicast routing table entries on demand. When it receives a multicast datagram and has no matching multicast routing table entry, the kernel asks the MOSPF implementation to install the appropriate routing table entry, calling the OSPF entry point OSPF:: mclookup() (see Section 4.3). For more information on MOSPF, consult Chapter 10 of [67] and the MOSPF protocol specification [66].

This chapter details how ...

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