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Instructor & Todd Lammle

Instructor & Todd Lammle

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Instructor & Todd Lammle

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  1. Instructor & Todd Lammle Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM

  2. Chapter 4 Objectives • The Cisco router IOS • Enhanced editing • Administrative functions • Hostnames • Banners • Passwords • Interface descriptions • Verifying your configuration 2

  3. Cisco Router IOS • Carries network protocols and functions • Connects high-speed traffic between devices • Adds security to control access • Provides scalability for growth • Supplies reliability

  4. Connecting To A Cisco Router Cisco 2811 Cisco 1841

  5. Bringing up a Router • Boot-up process: 1: POST 2: Looks for the Cisco IOS from Flash memory 3: IOS loads & looks for a valid configuration; • startup-config • stored in nonvolatile RAM (NVRAM) 4: If a valid config is not found in NVRAM: • setup mode

  6. Setup Mode • Basic Management Setup • Extended Setup • Command-Line Interface

  7. Command-Line Interface (CLI) • More flexible than setup mode. • To use the CLI, just say No to entering the initial configuration dialog.

  8. Logging into the Router • User mode: • Router> • Used mostly to view statistics • Privileged mode: • Router# • Used to view & change router configuration

  9. Overview of Router Modes • Global changes: • config terminal or config t • Changes made to running-config(DRAM) • To change the startup-config (NVRAM) • config memory or configmem Note: Any configuration changes need to be placed into RAM. Typing configmem or config net (from a TFTP host) will appendthe current running-config

  10. Configuration • CLI Prompts • Interfaces • Sub-interfaces • Line Commands • Routing Protocol Configurations

  11. Editing & Help Features

  12. Editing & Help Features • Commands starting with a certain letter Router#c? clear clock configure connect copy • Enhanced Editing Commands • Router-Command History • Gathering Basic Routing Information • show version

  13. Enhanced Editing Commands

  14. Enhanced Editing Commands (cont.)

  15. Router Command History

  16. Gathering Basic Routing Information

  17. Administrative Functions The administrative functions that you can configure on a router and switch are • Hostnames • Banners • Password • Interface descriptions

  18. Hostnames & Descriptions • Hostnames Router(config)#hostname todd todd(config)# • Descriptions Atlanta(config)#int e0 Atlanta(config-if)#description Sales Lan

  19. Banners • Purpose • Types • exec • incoming • login • motd • Delimiting character

  20. Setting the Passwords • 5 passwords: • 1st two used to set your enable password • Used to secure privileged mode; Router>enable • Other three are used to configure a password in user mode via: • console port • auxiliary port • Telnet

  21. Passwords • Enable passwords Router(config)#enable password cisco Router(config)#enable secret cisco • Auxiliary Password • Console Password • Telnet Password • Encrypting Your Password Router(config)#service password-encryption

  22. Interface Descriptions Setting descriptions on an interface is helpful to the administrator and, like the hostname, only locally significant. The description command is a helpful one because you can, for instance, use it to keep track of circuit numbers. Here’s an example: Atlanta(config)#int e0 Atlanta(config-if)#description Sales Lan Atlanta(config-if)#int s0 Atlanta(config-if)#desc Wan to Miami circuit:6fdda4321 You can view the description of an interface either with the show running-config command or the show interface command.

  23. Router Interfaces • Bringing up an Interface no shutdown shutdown show interface • Configuring an IP Address on an Interface Router(config)#int e0 Router(config-if)#ip address 172.16.10.2 255.255.255.0 Router(config-if)#no shut • Serial Interface Commands clock rate & bandwidth (entered in kilobits)

  24. Viewing, & Saving Configurations • Viewing & Saving Configurations • running-configsaved in DRAM • startup-config saved in NVRAM copy run start sh run sh start erase startup-config

  25. Verifying Your Configuration Tools: • show running-config • show startup-config • ping • show cdp nei detail • trace • telnet

  26. Other Verification Methods • Verifying with the show interface command • Router#show interface ? • Verifying with the show ip interface command • Router#show ip interface • Router#show ip interface brief • Router#show controllers

  27. Summary • Go through all the written labs and review questions • Review answers in class 27