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Chapter 1
XNS Overview
This chapter provides information on the Nortel Networks implementation of the
Xerox Networking System (XNS) router software. The Nortel Networks
implementation of XNS is based on the Xerox System Integration Standard
specification (Xerox Corporation, December 1981), commonly referred to as The
Gray Book.
This chapter describes the following topics:
• XNS Protocol Stack
• Protocol Layer/Level Support
• XNS Routing Information Protocol (RIP)
• Error Protocol
• Echo Protocol
• Sequenced Packet Protocol
• Packet Exchange Protocol
• External Servers
• Static Routes
• Adjacent Hosts
• Configurable Split Horizon
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