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C H A P T E R50
Chapter Goals
• Describe background information about SMRP.
• Define the terms used in SMRP networking.
• Describe the functional characteristics of SMRP, including management, transaction, and packet
format.
Simple Multicast Routing Protocol
Introduction
The Simple Multicast Routing Protocol (SMRP) is a transport layer protocol developed to route
multimedia data streams over AppleTalk networks. It supports Apple Computer’s QuickTime
Conferencing (QTC) technology. SMRP provides connectionless, best-effort delivery of multicast
datagrams and relies on underlying network layer protocols for services. In particular, SMRP facilitates
the transmission of data from a single source to multiple destinations. This chapter focuses on the
functional elements and protocol operations of SMRP. Figure 50-1 illustrates a generalized SMRP
environment.
In creating SMRP, Apple borrowed a number of strategies and concepts from other protocols and
technologies. In doing so, many terms were adapted to have specific meanings in Apple’s SMRP
environment. Table 50-1 provides a summary of SMRP-specific terms and definitions. These terms are
used throughout this chapter.
Table 50-1 SMRP-Specific Terms and Definitions
Term
Definition
adjacent
endpoint
In relation to a node or an endpoint, an endpoint on the same local
network, or a node connected through a tunnel.
adjacent node
In relation to a node or an endpoint, a node on the same local
network.
child endpoint
An adjacent endpoint to which a node sends multicast data.
child node
In relation to a member node of a group, a neighbor node farther
from the creator endpoint.
child port
In relation to a group, a port that is the interface to one or more
child nodes.
50-1
rnetworking Technologies Handbook
Chapter 50
Simple Multicast Routing Protocol
Introduction
creator endpoint
The endpoint that requested creation of the group, and the source
of data forwarded to the group.
creator node
The primary node that created the group.
designated nod