Intro to Cisco Routers and RIP & IGRP

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Intro to Cisco Routers and

RIP & IGRP

Lecture 6

Hassan Shuja

04/18/2006

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2

Cisco Routers


SOHO, Branch Office, Central Site


Different size sites will have different requirements


Review handout to determine proper router for each type of site


Some of the determining factors in selecting a router are cost, availability,
throughput, and additional features


Service Providers (ISP) have a different line of routers available to them






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3

Cisco Routers


SOHO, Branch Office, Central Site


Cisco has added the 800, 1800, 2800, and 3800 Integrated Service
routers


http://cisco.com/en/US/products/hw/routers/products_category_buyers_guide.html


Integrated routers allow one box to be the router, security device, VPN
Gateway, WAP, Switch, IP Telephony Call Manger, etc…






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RIP & IGRP


Routing Information Protocol (RIP)


RIP updates are sent every 30 seconds


A router updates its routing table once it receives an update and increments
the path metric to the destination network by 1


RIP only maintains the best path to the remote network which is based on
hop metric


Could case unoptimal paths


Routing updates are sent independently of the regularly scheduled updates


RIP is very easy to configure


RIP does not support VLSM


RIP Metric


RIP only uses the hop count metric


Each hop has a value of 1


The maximum number of hops allowed in a path are 15


If a router receives an update that increases the metric for a network to be 16
then that network is considered to be unreachable






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RIP & IGRP


RIP Configuration


RIP only requires two commands to be enabled






Example:

Router(config)#router rip

Router(config
-
router)#network 199.20.3.0

Router(config
-
router)#network 10.0.0.0

Router(config
-
router)#network 130.85.0.0


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RIP & IGRP


Interior Gateway Routing Protocol (IGRP)


IGRP was developed by Cisco in the mid 80s


The goal was to provide a robust routing protocol with an autonomous
system


Autonomous system is collection of networks under a common administration
sharing a common routing strategy


Can also be thought of as a routing domain


IGRP uses a metric that factors delay, bandwidth, reliability
,
and load


Network administrators can change these values and influence route
selection


Bandwidth metric is set on the specific interface


IGRP permits multipath routing


IGRP does not support VLSM




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RIP & IGRP


IGRP Configuration


IGRP only requires two commands to be enabled






Example:

Router(config)#router igrp 5

Router(config
-
router)#network 199.20.3.0

Router(config
-
router)#network 10.0.0.0

Router(config
-
router)#network 130.85.0.0


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RIP & IGRP Testing


Ping


The ping command sends an ICMP echo request packet to the destination
address


The destination responds back with an echo reply ICMP packet


The Ping command sends the first packet and waits for the response


If a response is received a “!” is displayed


If no response is received a “.” is displayed


The default timeout is 2 seconds


Cisco IOS sends 5 packets by default


Extended Ping


Allows you to change the default ping packet settings


Most importantly allows you to specific which interface to use as the source
when sending the ping packet


It allows you to also change the following things


Packet size, timeout, number of packets sent