Semester 2 v3'1'1: Routers and Routing Basics

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Semester 2 v3.1.1Routers and Routing Basics

• MODULE 2
• Introduction to Routers

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Internetwork Operating System

• Like any computer, networking devices need an
  operating system to function.
• Workstations use UNIX, Windows, Mac OS.
• Cisco routers and switches use Cisco IOS.
• IOS core generally uniform across most routers
  and Catalyst switches.
• Cisco IOS utilises a command line interface
  (CLI), accessed by
• Console session via a local serial connection.
• Auxiliary session via remote dial-up connection.
• Virtual terminal session via remote IP connection.

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How to use Cisco IOS

• Device modes of operation
• Cisco IOS modes of operation

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Image is Everything

• All Cisco IOS images utilise a common core of
  basic configuration command structure across all
  supported Cisco devices.
• Different IOS images developed for different
  hardware platforms, each with a different
  software feature set.
• More features in the image requires more RAM and
  Flash memory in the destination device.
• Important to check the Cisco device meets the
  requirements of the IOS to be installed.
• Display RAM and Flash memory capacities using
  show version in Privileged EXEC
• Show Flash usage using show flash in Privileged
  EXEC

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The power of IOS. Now.

• For a router to be operational, it must
• Test the hardware for errors
• Done by Power On Self Test (POST) in ROM.
• Locate and load the Cisco IOS
• Bootstrap loads from ROM, then locates IOS image
  from Flash and copies it into RAM.
• As IOS loads, router hardware information is
  displayed, including router model, processor,
  amount of memory, and number and types of
  interfaces.
• Locate and apply the router config file
• IOS looks for config file in NVRAM.
• If theres no config file to apply, then IOS
  initiates setup dialogue.

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IOS QuickStart Guide

• Access to the CLI is provided at two levels
• User EXEC Limited router monitoring
• Privileged EXEC Unrestricted access to all
  router commands
• Access restricted by use of enable secret
  command.
• Global configuration mode Apply configuration
  changes to a router.
• Access only via Privileged EXEC mode.
• A list of available commands can be displayed by
  entering ? at the CLI prompt.
• If a command is incorrectly entered at the CLI
  prompt, a message highlighting the error will
  appear.
• Invalid input detected at '' marker

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Take Command of IOS
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Welcome to my world )

• Daniel Comarmond
• CCNP, CCDP, CCSP, CCAI
• Cisco Networking Academy Instructor
• Systems Engineer Cisco Systems
• E-Mail dcom_at_it.uts.edu.au
• MSN dcom82_at_dcom82.com
• Phone [phone]
• Website http//www-staff.it.uts.edu.au/dcom
• Take care, and SMILE!!! )