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Interior Gateway Protocol (IGP)

Posted: 2017-10-14

IGP - Interior Gateway Protocol is used to exchange routing information between multiple routers in Autonomous System (single organization network). It consists group of other routing protocols such as Open Shortest Path (OSPF), Routing Information Protocol (RIP), Intermediate System to Intermediate System (IS-IS), and Enhanced Interior Gateway Protocol (EIGRP).

Type or class of routing protocols:
Distance-Vector Routing Protocol Sends complete routing table to neighboring routers and the cost (using distance and vector) to its interface and directly connected routers - See here for more about Distance-Vector Protocol. Examples of Distance-Vector are RIP, RIPv2, RIPng, IGRP, EIGRP, BGP

Link-State Routing Protocol only learned links are send to the neighboring routers and each router computes its shortest path to destination. The router is aware of the state of the link - See here for more infor about Link State Protocols. Examples of Link State Protocl are OSPF and IS-IS

Administrative Distance of Each Protocol
Connected interface 0
Static route 1
Enhanced Interior Gateway Routing Protocol (EIGRP) 5
Border Gateway Protocol (BGP) 20
Internal EIGRP 90
IGRP 100
OSPF 110
Intermediate System-to-Intermediate System (IS-IS) 115
Routing Information Protocol (RIP) 120
Exterior Gateway Protocol (EGP) 140
On Demand Routing (ODR) 160
External EIGRP 170
Internal BGP 200
Unknown Protocol 255

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