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Unformatted text preview: © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public ITE PC v4.0 Chapter 1 1 Distance Vector Routing Protocols Routing Protocols and Concepts – Chapter 4 Modified by Tony Chen 02/01/2008 ITE PC v4.0 Chapter 1 2 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Notes: If you see any mistake on my PowerPoint slides or if you have any questions about the materials, please feel free to email me at [email protected] . Thanks! Tony Chen College of DuPage Cisco Networking Academy ITE PC v4.0 Chapter 1 3 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives Identify the characteristics of distance vector routing protocols. Describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP). Describe the processes to maintain accurate routing tables used by distance vector routing protocols. Identify the conditions leading to a routing loop and explain the implications for router performance. Recognize that distance vector routing protocols are in use today ITE PC v4.0 Chapter 1 4 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Distance Vector Routing Protocols Dynamic routing protocols help the network administrator overcome the time- consuming and exacting process of configuring and maintaining static routes . Examples of Distance Vector routing protocols : Routing Information Protocol (RIP) – RFC 1058. – Hop count is used as the metric for path selection. – If the hop count for a network is greater than 15, RIP cannot supply a route to that network. – Routing updates are broadcast or multicast every 30 seconds, by default. Interior Gateway Routing Protocol (IGRP) – proprietary protocol developed by Cisco. – Bandwidth, delay, load and reliability are used to create a composite metric. – Routing updates are broadcast every 90 seconds, by default. – IGRP is the predecessor of EIGRP and is now obsolete. Enhanced Interior Gateway Routing Protocol (EIGRP) – Cisco proprietary distance vector routing protocol. – It can perform unequal cost load balancing. – It uses Diffusing Update Algorithm (DUAL) to calculate the shortest path. – There are no periodic updates as with RIP and IGRP. Routing updates are sent only when there is a change in the topology. ITE PC v4.0 Chapter 1 5 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Distance Vector Routing Protocols The Meaning of Distance Vector : – A router using distance vector routing protocols knows 2 things: Distance to final destination The distance or how far it is to the destination network Vector, or direction, traffic should be directed The direction or interface in which packets should be forwarded For example, in the figure, R1 knows that the distance to reach network 172.16.3.0/24 is 1 hop and that the direction is out the interface S0/0/0 toward R2. ITE PC v4.0 Chapter 1 6 © 2007 Cisco Systems, Inc. All rights reserved.© 2007 Cisco Systems, Inc....
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This note was uploaded on 02/12/2012 for the course NETWORKING NETW204 taught by Professor Baig during the Spring '09 term at DeVry Addison.

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chap4 - © 2007 Cisco Systems, Inc. All rights reserved....

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