Classifying Routing Protocols

In this article we will discuss Classifying Routing Protocols, will make brief discussion on Classifying Routing Protocols, In last article we discuss about HSRP Debug Commands.

Dynamic routing protocols are used to facilitate the exchange of routing information between routers.

A routing protocol is a set of processes, algorithms, and messages that are used to exchange routing information and populate the routing table with the routing protocol’s choice of best paths. The purpose of dynamic routing protocols 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

Routing protocols can be classified into different groups according to their characteristics. Specifically, routing protocols can be classified by their:

  • Purpose – Interior Gateway Protocol (IGP) or Exterior Gateway Protocol (EGP)
  • Operation – Distance vector protocol, link-state protocol, or path-vector protocol
  • Behavior – Classful (legacy) or classless protocol

For example, IPv4 routing protocols are classified as follows:

  • RIPv1 (legacy) – IGP, distance vector, classful protocol
  • IGRP (legacy) – IGP, distance vector, classful protocol developed by Cisco (deprecated from 12.2 IOS and later)
  • RIPv2 – IGP, distance vector, classless protocol
  • EIGRP – IGP, distance vector, classless protocol developed by Cisco
  • OSPF – IGP, link-state, classless protocol
  • IS-IS – IGP, link-state, classless protocol
  • BGP – EGP, path-vector, classless protocol

The classful routing protocols, RIPv1 and IGRP, are legacy protocols and are only used in older networks. These routing protocols have evolved into the classless routing protocols, RIPv2 and EIGRP, respectively. Link-state routing protocols are classless by nature.

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