Terms and Acronyms

• ASM (Any Source Multicast)—A method of allowing a multicast receiver to listen to all traffic sent to a multicast group, regardless of its source.
• BSR (broadband services router)—A router used for subscriber management and edge routing.
• IGMP (Internet Group Membership Protocol)—A host to router signaling protocol for IPv4 used to support IP multicasting.
• IS-IS (Intermediate System-to-Intermediate System)—A link-state, interior gateway routing protocol (IGRP) for IP networks that uses the shortest-path-first (SPF) algorithm to determine routes.
• LSP (label-switched path)—The path traversed by a packet that is routed by MPLS. Some LSPs act as tunnels. LSPs are unidirectional, carrying traffic only in the downstream direction from an ingress node to an egress node.
• MPLS (Multiprotocol Label Switching)—A mechanism for engineering network traffic patterns that functions by assigning to network packets short labels that describe how to forward the packets through the network.
• OIF (outgoing interface)—An interface used by multicast functions within a router to determine which egress ports to use for fowarding multicast groups.
• OSPF (Open Shortest Path First)—A link-state interior gateway protocol (IGP) that makes routing decisions based on the shortest-path-first (SPF) algorithm (also referred to as the Dijkstra algorithm).
• PIM (Protocol Independent Multicast)—A multicast routing protocol used for delivering multicast messages in a routed environment.
• routing gateway—A firewall, Network Address Translation (NAT) router, or other routing device used as a customer premises equipment (CPE) terminator in the home, office, or local point of presence (POP).
• SSM (single-source multicast)—A routing method that allows a multicast receiver to detect only a specifically identified sender within a multicast group.
• set-top box—The end host or device used to receive IPTV video streams.
• VOD (video on demand)—A unicast streaming video offering by service providers that enables the reception of an isolated video session per user with rewind, pause, and similar VCR-like capabilities.
• VSR (video services router)—A router used in a video services network to route video streams between an access network and a metro or core network. The VSR is any M-series or MX-series router that supports the video routing package provided with JUNOS software Release 8.3 or later.

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