Table of Contents Cisco Switching Black Book...............................................................................................................................1 Introduction.........................................................................................................................................................4 Overview..................................................................................................................................................4 Is This Book for You?..............................................................................................................................4 How to Use This Book.............................................................................................................................4 The Black Book Philosophy....................................................................................................................5 Chapter 1: Network Switching Fundamentals.................................................................................................6 In Depth...................................................................................................................................................6 Physical Media and Switching Types......................................................................................................6 A Bit of History.......................................................................................................................................7 Networking Architectures.................................................................................................................7 The Pieces of Technology........................................................................................................................9 Repeaters.........................................................................................................................................10 Hubs.................................................................................................................................................10 Bridges.............................................................................................................................................11 Routers.............................................................................................................................................13 Switches...........................................................................................................................................13 Network Design.....................................................................................................................................14 Collision Domains...........................................................................................................................15 Broadcast Domains..........................................................................................................................16 Why Upgrade to Switches?.............................................................................................................16 Switched Forwarding......................................................................................................................19 Switched Network Bottlenecks.......................................................................................................20 The Rule of the Network Road........................................................................................................22 Switched Ethernet Innovations..............................................................................................................23 Full−Duplex Ethernet......................................................................................................................23 Fast Ethernet....................................................................................................................................23 Gigabit Ethernet..............................................................................................................................24 The Cisco IOS........................................................................................................................................24 Connecting to the Switch................................................................................................................25 Powering Up the Switch..................................................................................................................25 The Challenges.......................................................................................................................................27 Today’s Trend........................................................................................................................................27 Entering and Exiting Privileged EXEC Mode.......................................................................................28 Entering and Exiting Global Configuration Mode.................................................................................28 Entering and Exiting Interface Configuration Mode.............................................................................28 Entering and Exiting Subinterface Configuration Mode.......................................................................28 Saving Configuration Changes..............................................................................................................29 Chapter 2: Basic Switch Configuration..........................................................................................................30 In Depth.................................................................................................................................................30 Command−Line Interfaces....................................................................................................................30 Campus Hierarchical Switching Model.................................................................................................31 Access Layer...................................................................................................................................32 Distribution Layer...........................................................................................................................32 Core Layer.......................................................................................................................................33 Remote Network Monitoring.................................................................................................................33 Connecting to the Console Port.............................................................................................................34 Console Cable Pinouts.....................................................................................................................35 Console Connectors.........................................................................................................................36 i Table of Contents Chapter 2: Basic Switch Configuration The RJ−45−to−AUX Port Console Connector Pinouts...................................................................36 Switch IOSs...........................................................................................................................................38 The IOS Configuration Modes........................................................................................................38 Limiting Telnet Access..........................................................................................................................39 Implementing Privilege Levels..............................................................................................................39 Configuring an IOS−Based CLI Switch................................................................................................39 Setting the Login Passwords...........................................................................................................40 Setting Privilege Levels...................................................................................................................40 Assigning Allowable Commands....................................................................................................40 Setting the Console Port Time−out Value.......................................................................................40 Configuring the Telnet Time−out Value.........................................................................................41 Configuring the Hostname..............................................................................................................41 Configuring the Date and Time.......................................................................................................41 Configuring an IP Address and Netmask........................................................................................41 Configuring a Default Route and Gateway.....................................................................................41 Configuring Port Speed and Duplex...............................................................................................42 Enabling SNMP Contact.................................................................................................................42 Configuring a Set/Clear−Based CLI Switch..........................................................................................42 Logging On to a Switch...................................................................................................................42