IP Multicast Overview
The JUNOS Internet 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, for IPv4 routers.
- Multicast Listener Discovery (MLD), versions 1 and 2—Used to learn whether group members are present, for IPv6 routers.
- 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.