Configuring Network Devices

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1 Configuring Network Devices Working at a Small-to-Medium Business or ISP Chapter 5 (part 1) Copyleft 2012 Vincenzo Bruno ( Released under Crative Commons License 3.0 By-Sa Cisco name, logo and materials are Copyright Cisco Systems Inc. 1

2 Introduction

3 Integrated Services Router (ISR) The Cisco Integrated Services Router (ISR) is one of the most popular networking devices to meet the growing communications needs of businesses. The ISR combines features such as routing and LAN switching functions, security, voice, and WAN connectivity into a single device. This makes the ISR ideal for small to medium-sized businesses and for ISP-managed customers. The ISR routing function allows a network to be broken into multiple local networks using subnetting and supports internal LAN devices connecting to the Internet or WAN

4 The Cisco Internetwork Operating System (IOS) Cisco IOS software is offered to customers in modules called images The entry-level Cisco IOS software image is called the IP Base image Other Cisco IOS software images add services to the IP Base image Images are designed to operate on specific models of routers, switches, and ISRs

5 Physical setup of ISR Follow these steps to power up an 1841 ISR. 1) Securely mount and ground the device chassis, or case. 2) Seat the external compact flash card. 3) Connect the power cable. 4) Configure the terminal emulation software on the PC and connect the PC to the console port. 5) Turn on the router. 6) Observe the startup messages on the PC as the router boots up.

6 Bootup Process 1) Perform Power-on self test (POST) and load the bootstrap program 2) Locate and load the Cisco IOS software 3) Locate and execute the startup configuration file or enter setup mode

7 Configuration File The startup configuration file is the saved configuration file that sets the properties of the device each time the device is powered up. This file is stored in non-volatile RAM (NVRAM) The term running configuration refers to the current configuration running in RAM on the device. This file contains the commands used to determine how the device operates on the network copy running-config startup-config, or copy run start

8 Show version command

9 Configuration Register The configuration register tells the router how to boot up It is possible to change the configuration register and, therefore, change where the router looks for the Cisco IOS image and the startup configuration file during the bootup process If there is a second value in parentheses, it denotes the configuration register value to be used during the next reload of the router

10 ROM Monitor If the router fails to boot the IOS, it then boots up in ROM monitor (ROMmon) mode. ROMmon software is a simple command set stored in read only memory (ROM) that can be used to troubleshoot boot errors and recover the router when the IOS is not present If an image is located, attempt to boot the image with the command: rommon 1>boot flash:c2600-is-mz After boot use the show version command to check the configuration register to ensure that it is configured for the default boot sequence. If the configuration register value is correct, use the show startupconfig command to see if there is a boot system command that instructs the router to use a different location for the Cisco IOS image

11 Management Methods Out-of-band management requires a computer to be directly connected to the console port or auxiliary port (AUX) Use in-band management to monitor and make configuration changes to a network device over a network connection

12 Cisco IOS Programs Command Line Interface (CLI) and Security Device Manager (SDM) Not all Cisco devices support SDM. In addition, SDM does not support all the commands that are available through the CLI

13 Command Line Interface Modes The Cisco IOS supports two levels of access to the CLI: user EXEC mode and privileged EXEC mode The access level defaults to user EXEC mode, this mode is indicated by the command line prompt: Router> Commands are limited to some show commands and the ping and traceroute utilities Enable the privileged EXEC mode by entering enable at the command prompt and pressing Enter The command line prompt changes to reflect the mode change. The prompt for privileged EXEC mode is: Router# To disable the privileged mode and return to user mode, enter disable at the command prompt. Both modes can be protected with a password, or a username and password combination.

14 Configuration modes From privileged EXEC mode, the user can access the other configuration modes To enter global configuration, type the command configure terminal or config t. Global configuration mode is indicated by the command line prompt: Router(config)# From global configuration mode, the administrator can enter other sub-modes Interface configuration mode is used to configure LAN and WAN interfaces. To access interface configuration mode, from global configuration type the command interface [type] [number]. Interface configuration mode is indicated by the command prompt: Router(config-if)#

15 Obtaining help Entering help or the? at the command prompt displays a brief description of the help system Context-sensitive help can provide suggestions for completing a command If the first few characters of a command are known but the exact command is not, enter as much of the command as possible, followed by a? Use TAB key for suggestions

16 Incomplete and Invalid Commands

17 Command History Ability to recall previously typed commands To change the number of command lines the system records during a session, use the terminal history size or the history size command. The maximum number of command lines is 256 The default number of command lines is 10 Recall previous commands with Ctrl-P or the Up Arrow key Recall following commands with Ctrl-N or the Down Arrow key The CLI recognizes partially typed commands based on their first unique character

18 Using Show Commands The status of nearly every process or function of the router can be displayed using a show command. The show commands can be accessed from privileged EXEC mode (not from sub-modes) Some of the more popular show commands are: show running-config show interfaces show arp show ip route show protocols show version

19 Practice Let's practice on Packet Tracer!

Demonstrate your knowledge of these concepts by answering the following questions in the space provided.

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