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IP Multicast Overview
The JUNOS software implements the following protocols to support IP multicast routing:
- Internet Group Management Protocol (IGMP), Versions 1 and 2--Used to learn whether group members are present.
- Distance Vector Multicast Routing Protocol (DVMRP)--Dense-mode multicast routing protocol.
- Protocol-Independent Multicast (PIM)--Multicast routing protocol that routes to multicast groups that might span wide-area and interdomain internetworks. Both dense mode and sparse mode are supported.
- Multicast Source Discovery Protocol (MSDP)--Multicast routing protocol that discovers active sources of multicast messages. PIM sparse mode uses these sources.
- Session Announcement Protocol (SAP) and Session Description Protocol (SDP)--Handle conference session announcements.
This chapter discusses the following topics that provide background information about IP Multicast:
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