Operating and Configuring Cisco IOS Devices © 2004 Cisco Systems, Inc. All rights reserved. Operating Cisco IOS Software INTRO v2.0—8-1

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-2 Outline Overview Configuring and Testing Switches and Routers – SOHO vs. Enterprise Cisco IOS Features and Functions Configuring Network Devices External Configuration Sources Cisco IOS Command-Line Interface Functions Entering the EXEC Modes Summary

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-3 Configuration and Testing of Switches and Routers

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-4 Cisco IOS Software Features to carry the chosen network protocols and functions Connectivity for high-speed traffic between devices Security to control access and prohibit unauthorized network use Scalability to add interfaces and capability as needed for network growth Reliability to ensure dependable access to networked resources

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-5 Configuring Network Devices Configuration sets up the device with the following: – Network policy of the functions required – Protocol addressing and parameter settings – Options for administration and management Catalyst switch memory has initial configuration with default settings. A Cisco router will prompt for initial configuration if there is no configuration in memory.

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-6 An Overview of Cisco Device Startup

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-7 Configurations can come from many sources. Configurations will act in device memory. External Configuration Sources

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-8 A CLI is used to enter commands. Operations vary on different internetworking devices. Users type or paste entries in the console command modes. Command modes have distinctive prompts. Enter key instructs device to parse and execute the command. Two primary EXEC modes are user mode and privileged mode. Cisco IOS User Interface Functions

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-9 There are two main EXEC modes for entering commands. Cisco IOS Software EXEC Mode (User)

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-10 Cisco IOS Software EXEC Mode (Privileged)

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-11 Summary The ability to deploy, configure, test and troubleshoot network devices quickly is a key component in an workgroup/enterprise environment. While a home/SOHO switch/router has limited configuration and testing capabilities, the Cisco switch/router, more appropriate for an workgroup/enterprise environment, has considerable configuration and testing capabilities. Cisco IOS software is the embedded software architecture in all of the Cisco routers and is also the operating system of the Catalyst switches. Its features include carrying the chosen network protocols and function, connectivity, security, scalability, and reliability.

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—8-12 Summary (Cont.) A switch or router can be configured from a local terminal connected to the console port or from a remote terminal connected via a modem connection to the auxiliary port. The CLI is used by network administrators to monitor and to configure various Cisco IOS devices. CLI also offers a help facility to aid network administrators with the verification and configuration commands. The CLI supports two EXEC modes: user and privileged. The privileged EXEC mode provides more functionality than the user EXEC mode.