Chapter Summary


This chapter discussed interior routing protocols, such as RIP, OSPF, IGRP, and EIGRP. Interior routing protocols use IP routing protocols and routing algorithms to route data from one point in the network to another.

RIP is a distance-vector routing protocol that uses hop counts for a measurement. OSPF is a link-state routing protocol that uses an autonomous system to achieve its routing. IGRP is a distance-vector protocol that is proprietary to Cisco. EIGRP combines link-state and distance-vector routing to achieve its routing and is also a Cisco proprietary protocol.

Distance-vector routing protocols are designed to send a copy of their entire routing table to all of their neighbors, allowing all the routers to know the routing paths and determine the lowest cost (shortest distance). The link-state routing process uses link-state packets to inform other routers of distant links and proximity. After the routers have all updated their fellow routers, each router will possess a routing table to refer to when it needs to make routing decisions and choose the best path .

The chapter also discussed an exterior gateway protocol, Border Gateway Protocol (BGP). The main goal of BGP is to provide an interdomain routing system that will guarantee a loop-free exchange of routing information between autonomous systems. BGP was designed to allow ISPs to communicate and exchange packets.

You should develop a good understanding of how routing protocols operate and determine paths through the network. By doing this, it will make troubleshooting routing problems in your network much easier. Using the show and debug commands found in this chapter will also help you isolate routing problems in your network.



CCNP CIT Exam Cram 2 (642-831)
CCNP CIT Exam Cram 2 (Exam Cram 642-831)
ISBN: 0789730219
EAN: 2147483647
Year: 2003
Pages: 213
Authors: Sean Odom

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