Seminar ONCISCO ROUTER CONFIGURATION

CONTENT

Introduction to RouterSeries of RouterInterfaces of RouterTypes of RouterProtocols used in RouterConfiguring a Router Configure RIP & IGRP protocols

What is Router & why we use it?

Router is basically a special computer that select the best path.Operate on physical, data & network layer in the OSI model.Uses protocols for determine a best path(such as RIP,IGRP etc).It also perform a switching function.Router has four basic components:1. CPU2. I/O interfaces3. Memory4. Bus connecting to the component

Cisco Router Models 

Cisco routers come in variety of models, ranging from the 600 series to the 12000 series.

INTERFACES OF ROUTER

LAN Interface:-Includes one or more Ethernet or Token

Ring interface.

WAN Interface:-Responsible for connecting the

customers’ n/w to WAN services.

TYPES OF CISCO ROUTERS

Fixed Router:-Have fixed interfaces means can’t change

after installation.

Modular Router:-Have not fixed interfaces means can

change according to need.

PROTOCOL USED IN CISCO ROUTER

RIP (Routing Information Protocol)

IGRP (Interior Gateway Routing Protocol)

OSPF (Open shortest path first)

EIGRP (Enhance Interior Gateway Routing Protocol)

RIP Protocol

Standard internet protocol.Sends periodic routing updates every 30 sec.Sends triggered updates whenever topology changes occur.Used a hope count metric. Paths with the smallest hope count are the best.Define a maximum hope count of 16.Allow up to 25 routes in a single routing update packet.Support multiple Routed protocols.Comes in 2 versions (ver1 & ver2).

IGRP Protocol

Sends periodic routing updates every 90 sec.Sends triggered updates whenever topology changes occur.Has a maximum hope count of 255.Currently runs in only TCP/IP and OSI network.Default Administrative Distance=100

In addition, IGRP support 2 types of route in TCP/IP environment:-Interior Routes (routes within an AS)Exterior Routes (routes outside the AS)

Interior Routes

subnet 2 Subnet 3

Network 10.0.0.0 Subnet 4

subnet 1

IGRP interior routes in AS

Exterior Routes

Exterior route

Autonomous System 20

Autonomous

System 10

Exterior route outside the AS

CONFIGURE A CISCO ROUTER

Logging into the router 

This I called user mode and is mostly used to view statistics, it is also a stepping-stone to logging into privileged mode.

 Router>Router>enableRouter#  Router# indicates the privileged mode where we can both view and router

configuration. 14We can go back from privileged mode into user mode by using the

disable command. Router# disableRouter> At this point, you can type logout to exit the console: Router# logout

Router Modes

 

To configure from CLI (Command Line Interface), we can make global changes to the router by typing configure terminal (or config t for short), which puts us in global configuration mode and changes what’s known as running-config. We can type config from the privileged mode prompt and then just press Enter to take the default of terminal. 

 

FORMAT OF CONFIGURATION

Router>Router > enRouter # config tRouter (config) # hostname (i.e. Router name) Router (config) # interface (serial or ethernet)Router (config-if) # ip address subnet maskRouter (config-if) # no shutRouter (config-if) # copy run start Router (config) # exit (back to previous mode)

This figure shows four routers: - 2500A, 2500B, 2500C, 2621A. These routers, by default, only know about their direct connected networks. The three 2501 routers connected via a WAN and the 2621 router connected via the Ethernet network off 2501A.The first step is to configure each router with the correct configuration.

Following table shows IP address scheme that I’ll used to configure the router

2621A configuration 

2501A configuration 

 

2501B configuration 

  

2501C configuration

General Format For RIP Configuration

Router>

Router>en

Router(config)#router rip

Router(config-router)#network net_id

Router(config-router)#^z

Router#copy run start

General Format For IGRP Configuration

Router>

Router>en

Router(config)#router igrp

Router(config-router)#igrp autonomous-system-number

Router(config-router)#network net_id

Router(config-router)#^z

Router#copy run start