DECbrouter 90 Products Configuration and Reference Volume 3

This document, "DECbrouter 90 Products Configuration and Reference Volume 3," is a technical manual for system administrators, providing comprehensive guidance on configuring and maintaining DECbrouter 90 network products.

The guide is organized into eleven main chapters and several appendices, covering a wide range of network protocols and functionalities:

• ISO Connectionless Network Services (CLNS) (Chapters 1 & 2): Covers the basics of ISO CLNS switching, addressing (NSAPs, NETs), ES-IS parameters, and performance tuning. It details the configuration of static and dynamic routing protocols like ISO-IGRP and IS-IS, including aspects such as router level support, route redistribution, preferred routes, and authentication.
• Novell IPX (Chapter 3): Explains the DECbrouter 90's implementation of Novell IPX routing, its addressing scheme, encapsulation methods, static routes and SAP entries, and the configuration of maximum paths and update timers. It also covers extensive packet filtering (access lists, routing updates, SAP filters) and broadcast helper facilities.
• Xerox PARC Universal Protocol (PUP) (Chapter 4): Outlines PUP routing configuration, addresses, and miscellaneous services like the PING command.
• Banyan VINES (Chapter 5): Describes VINES routing implementation, addressing, the Routing Table Protocol (RTP), address resolution, encapsulation, name-to-address mappings, and VINES access lists.
• Xerox Network System (XNS) (Chapter 6): Details XNS routing configuration, addressing (network, host, socket numbers), throughput management (multiple paths, fast switching, timers), and handling XNS broadcasts (flooding, helpering). It also covers XNS access lists and filters, including specifics for Ungermann-Bass Net/One networks.
• Transparent Bridging (Chapter 7): Provides an overview of bridging concepts and the DECbrouter 90's support for transparent bridging. This includes spanning-tree protocol configuration (multiple domains, root bridge election, parameters), administrative filtering (MAC address, protocol type, vendor code, LAT service announcements, extended access lists), and special configurations like load balancing, X.25 bridging, Frame Relay bridging, and LAT compression.
• Serial Tunneling (STUN) and SDLC Transport (Chapter 8): Explains the STUN function for transporting SDLC and other ISO 3309-compliant frames over various media. Key topics include local acknowledgment, serial link address prioritization, and defining custom STUN protocols. It also addresses the use of STUN with multiple-link transmission groups and proxy polling in SDLC environments.
• LLC2 and SDLC Link-Level Support (Chapter 9): Offers an in-depth look at these IBM Data Link Level protocols, their roles, addressing, and various configurable parameters for fine-tuning performance and behavior.
• Fast Switching (Chapter 10): Briefly summarizes the protocols and interfaces that support fast switching on the DECbrouter 90.
• Point-to-Point Protocol (PPP) for DECnet IV and OSI (Chapter 11): Describes how to configure PPP encapsulation and enable DECnet and OSI routing over point-to-point links.

Each major section typically includes implementation overviews, detailed configuration steps and commands, filtering options, monitoring commands (to display status, caches, tables, and traffic), and debugging commands, often supplemented with practical examples and command summaries.

The appendices provide supplementary reference material such as system error messages, a summary of access list syntax and number ranges by protocol, Ethernet type codes, X.25 pattern matching schemes, ASCII character set information, and a list of references and recommended reading.