3 router basics and inital configurations

7/29/2019 3 Router Basics and Inital Configurations

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Introduction to Router&

Initial Configurations


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Lesson Objectives

Fundamentals concepts of Routers

Router Memories and Boot sequence

Interfaces of Router

IOS modes of the router

Initial configurations on Router in IPv6

domain


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Router fundaments

The router is a device that inter connects differentnetworks

It comes from the word ROUTE

A router accepts packets on at least two networkinterfaces and forwards packets from one interface

to another.

Router works at network layer.

Each router maintains a database called routing

table of the router


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Router fundamentals

Router is like a PC and has

Mother board

CPU Memory

Ports & interfaces to hook peripherals


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CISCOs HIERARCHICAL DESIGN MODEL

Access Layer : Small organization

Ex:1600,1700,1800,2500 series

Distribution Layer: Medium size organizationex: 2600,2800,3600,3700,3800

Core layer : Very large organizations and

ISPs.ex:7200,7600,10000,12000


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Cisco Router Memories

Memory Type Contents

RAM Active program & operating system

instructions

Running configuration files Routing tables

NVRAM Startup configuration files

ROM POST (Power-On-Self-Test)

Startup/Power-up utilities

Flash IOS


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Boot sequence

Power on self-test checks the hardware The ROM loads the bootstrap program and

searches for the IOS

IOS from flash is loaded

The startup configuration is loaded from the

NVRAM

Boot process is completed as all the configfiles are loaded into the RAM


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Interfaces of routers

LAN Interface to connect to the switch

WAN Interface to connect to the next router

(serial port) Administrative port (console port)

Auxiliary port


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IOS MODES

1. User Mode:

Router>

Router is the default host name '>' symbolimplies "user mode".

This is the first mode user interacts with the

IOS. It is a restricted mode and support only

a very few basic commands.


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IOS MODES

2. Privilege Mode:

Router#

'#' symbol implies "Privilage Mode".

This mode has full administrative rights.

This mode is generally used for advanced

troubleshooting using 'show' and 'debug'

command.


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IOS MODES

3. Global Configuration mode:

Router (config)#

'(config)# symbol implies "global

configuration mode".

Configuration of the router starts from this

mode configurations that affect the complete

router are given.

Example: host name of the router.


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IOS MODES

4. interface configuration mode:

Router(config-if)#

'(config-if)# symbol implies "interface configuration mode".This mode is used to configure a specific interface.

5. Line configuration mode:

Router(config-line)#

'(config-line)# symbol implies "Line configuration mode".This mode is used to configure telnet, console and auxiliarymode.

6. Router Mode:Router(config-router)#

'(config-router)#'symbol implies "Router mode". This modeis used to configure different dynamic routing protocol.


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ANY QUESTIONS ?????


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M.DEVI PRASAD, JTO

[email protected]

9490118909
mailto:[email protected]:[email protected]:[email protected]

3 router basics and inital configurations

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