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Instructor & Todd Lammle

Instructor & Todd Lammle. Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM. Chapter 4 Objectives. The Cisco router IOS Enhanced editing Administrative functions Hostnames Banners Passwords Interface descriptions Verifying your configuration. 2. Cisco Router IOS.

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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. Router Access Console port (console) Rollover cable, RJ-45 to DB-9, RJ-45 to DB-25 Auxiliary port (AUX) Virtual terminal (VTY)

  5. Connecting To A Cisco Router Cisco 2811 Cisco 1841

  6. Connecting To A Cisco Router

  7. Connecting Via Terminal Programs Establish a connection Physical connection through console 9600 bits per second, data bits 8, stop bits 1, parity “none”, flow control “none” Logical connection through VTY Terminal programs HyperTerminal, Microphone Pro, ProComm Plus, Telix, Tera Term

  8. 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

  9. Bringing up a Router Boot-up process:

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

  11. Command-Line Interface (CLI) • More flexible than setup mode. • To use the CLI, just say No to entering the initial configuration dialog. • Initial prompt consists of two parts • Hostname • Greater than symbol (>)

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

  13. 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

  14. Configuration Modes Global configuration mode Router(config)# Interface mode Router(config–if)# Line configuration mode Router(config-line)# Router configuration mode Router(config-router)#

  15. Configuration Modes

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

  17. Editing & Help Features

  18. 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

  19. Enhanced Editing Commands

  20. Enhanced Editing Commands (cont.)

  21. Router Command History

  22. Gathering Basic Routing Information

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

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

  25. Banners • Purpose: welcome message • Types • exec: set EXEC process creation banner • incoming: set incoming terminal line banner • login: login banner • motd: set message of the Day banner • Delimiting character

  26. Banners

  27. 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

  28. 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

  29. Passwords

  30. Passwords

  31. Passwords

  32. Passwords

  33. Passwords

  34. 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.

  35. 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)

  36. Configuring The Time And Date

  37. 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

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

  39. Other Verification Methods • Verifying with the show interface command • Router#show interface ? • Verifying with the show ip interface command (layer 3 info) • Router#show ip interface • Router#show ip interface brief • Router#show controllers

  40. Router Components ROM Flash memory NVRAM RAM/DRAM

  41. Router Components ROM Read-only memory (ROM) Bootstrap program ROM monitor firmware ROM monitor mode (>) or (rommon 1>)

  42. Router Components Flash memory Erasable, programmable, read-only memory (EPROM) Contains the Cisco IOS Can store multiple IOS “show version” command “show flash” command

  43. Router Components NVRAM Nonvolatile random access memory (NVRAM) Special type of RAM Not cleared when router is rebooted Startup configuration file “show start” command

  44. Router Components Random access memory (RAM) Volatile Information is not retain during router reboot Running configuration “show running-config” command “show memory” command “show buffers” command

  45. Summary • Go through all the written labs and review questions • Review answers in class 45

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