CCNA Explorer 2 Introduction to Dynamic Routing Protocols

Introduction and Advantages

Perspective and Background

History

Network discovery and routing table maintenance

The purpose of a routing protocol includes:

• Discovery of remote networks
• Maintaining up-to-date routing information
• Choosing the best path to destination networks
• Ability to find a new best path if the current path is no longer available

Advantages

Dynamic vs Static Routing

Overview

Overview

RIP - A distance vector interior routing protocol IGRP - The distance vector interior routing developed by Cisco (deprecated from 12.2 IOS and later) OSPF - A link-state interior routing protocol IS-IS - A link-state interior routing protocol EIGRP - The advanced distance vector interior routing protocol developed by Cisco BGP - A path vector exterior routing protocol

Classifying Dynamic Routing Protocols

IGP and EGP

IGP vs. EGP Routing Protocols

Distance Vector and Link State

Distance Vector bruger for det meste Bellman-Ford algoritmen.
Distance vector protocols work best in situations where:

• The network is simple and flat and does not require a special hierarchical design.
• The administrators do not have enough knowledge to configure and troubleshoot link-state protocols.
• Specific types of networks, such as hub-and-spoke networks, are being implemented.
• Worst-case convergence times in a network are not a concern.

Distance vector

Link-state protocols work best in situations where:

• The network design is hierarchical, usually occurring in large networks.
• The administrators have a good knowledge of the implemented link-state routing protocol.
• Fast convergence of the network is crucial.

Link-State