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Chapter 1
DECnet Overview
This chapter shows how Nortel Networks router software works with DECnet
services and describes the following:
• Organization of end nodes and routers in a DECnet network
• Transmission of messages from the Nortel Networks router through the
DECnet network
• Routing decision process for a DECnet network
• DECnet IV to V Transition feature
• Purpose of static routes
• Static adjacency support
DECnet Network Organization
A DECnet network contains two types of nodes: end nodes and routers. End nodes
send and receive messages. Routers transmit messages to end nodes and other
routers on the network.
DECnet Phase IV Organization
DECnet Phase IV is a networking protocol that supports large networks (up to
approximately 64,000 nodes). You can divide each network into as many as 63
distinct areas; each area contains up to 1023 nodes. You must assign to each area
an Area ID, unique to the network. You must also assign to each node within an
area a Node ID, unique to the area.
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