DEChub Network Configuration Part Number: EK-CONFG-CG. A01 October 1996 This manual describes platforms and modules used to build networks. Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description. Possession, use, or copying of the software described in this publication is authorized only pursuant to a valid written license from Digital or an authorized sublicensor. © Digital Equipment Corporation 1996. All rights reserved. Printed in U.S.A The following are trademarks of Digital Equipment Corporation: clearVISN, the clearVISN logo, DEC, DECagent, DECbridge, DECbrouter, DEChub, DECpacketprobe, DECrepeater, DECserver, DECswitch, Digital, the Digital logo, Digital MultiStack System, enVISN, GIGAswitch, HUBwatch, MANAGEWORKS, OpenVMS, PATHWORKS, POLYCENTER, RoamAbout, RouteAbout, ThinWire, and ULTRIX. The following are third-party trademarks: AppleTalk is a registered trademark of Apple Computer, Inc. Bay Networks and Wellfleet are trademarks of Bay Networks, Inc. Cisco is a registered trademark of Cisco Systems, Inc. DynaText is a registered trademark of Electronic Book Technologies, Inc. IBM is a registered trademark of International Business Machines Corporation. HP is a trademark and OpenView is a registered trademark of Hewlett-Packard Company. Microsoft Windows, Windows NT, Windows, and Windows 95 are trademarks of Microsoft Corporation. NetView is a registered trademark of International Business Machines Corporation. Novell and Netware are registered trademarks and ManageWise and NMS are trademarks of Novell Inc. UNIX is a registered trademark of X/Open Company Ltd. VINES is a registered trademark of Banyan Systems Incorporated. 3Com is a registered trademark of 3Com Corporation. All other trademarks and registered trademarks are the property of their respective holders. Contents Preface . ix 1 Platforms 1.1 Platform Types . 1-1 1.2 DEChub 90 . 1-2 1.3 DEChub 900 MultiSwitch. 1-4 1.4 Digital MultiStack System . 1-7 1.5 DEChub ONE . 1-9 1.6 DEChub ONE-MX . 1-10 2 Selecting Products 2.1 Platform Selection. 2-1 2.2 Repeater Module Selection . 2-2 2.3 PORTswitch Module Selection. 2-6 2.4 Bridge Module Selection. 2-8 2.5 Switch Module Selection . 2-9 2.6 Concentrator Module Selection. 2-11 2.7 Brouter Module Selection . 2-12 2.8 Router Module Selection. 2-14 2.9 Network Access Server Module Selection . 2-15 2.10 Token Ring Module Selection. 2-17 3 Network Modules 3.1 Network Module Types. 3-1 3.2 Repeaters . 3-2 3.3 Port Switches. 3-27 3.4 Bridges . 3-38 3.5 Switches . 3-45 3.6 Brouters . 3-59 iii 3.7 Routers . 3-62 3.8 Concentrators . 3-65 3.9 Network Access Servers. 3-74 3.10 Management Agents. 3-91 3.11 Token Ring . 3-94 3.12 Probes . 3-107 4 Management Methods 4.1 Introduction . 4-1 4.2 In-Band Management . 4-1 4.3 Out-of-Band Management . 4-7 5 Management Tools 5.1 Introduction . 5-1 5.2 clearVISN Applications . 5-2 5.3 Router Configurator . 5-4 5.4 Router Manager . 5-6 5.5 MultiChassis Manager . 5-8 5.6 Stack Manager . 5-10 5.7 VLAN Manager . 5-11 5.8 Flash Loader . 5-14 5.9 Recovery Manager . 5-15 5.10 RMON Manager. 5-18 6 Configuration Examples 6.1 Introduction . 6-1 6.2 Case 1: Managed 10BaseT Workgroup . 6-2 6.3 Case 2: Small Mixed Media Ethernet Workgroup . 6-4 6.4 Case 3: Multi-Ethernet Hub . 6-6 6.5 Case 4: Multi-Ethernet (Building) Backbone. 6-9 6.6 Case 5: Collapsed Fiber Optic (Campus) Ethernet Backbone . 6-14 6.7 Case 6: Shared FDDI Backbone. 6-19 6.8 Case 7: Switched FDDI Backbone. 6-22 6.9 Case 8: Remote Access Using Routers and Access Servers . 6-25 6.10 Case 9: Connecting Remote Sites to a Cisco Backbone. 6-27 A FDDI Configuration Capabilities A.1 Configuration Guidelines and Rules . A-2 iv A.2 Dual Ring Configurations . A-4 A.3 Tree Configurations. A-5 A.4 DECconcentrator 900MX . A-6 A.5 DECconcentrator 900TH. A-7 A.6 DECconcentrator 900FH. A-8 A.7 DECswitch 900EF. A-9 A.8 PEswitch 900TX . A-10 A.9 FDDI in the Hub Backplane . A-11 A.10 Default Configurations . A-14 A.11 FDDI Tree Configuration Examples. A-17 A.12 Dual Ring Configuration Examples . A-25 A.13 Fault Tolerance in Dual Rings . A-31 A.14 Fault Tolerance in Trees . ..