An interior gateway protocol (IGP) or Interior routing protocol is a type of
routing protocol
A routing protocol specifies how routers communicate with each other to distribute information that enables them to select routes between nodes on a computer network. Routers perform the traffic directing functions on the Internet; data packet ...
used for exchanging
routing table information between gateways (commonly
routers) ''within'' an
autonomous system Autonomous system may refer to:
* Autonomous system (Internet), a collection of IP networks and routers under the control of one entity
* Autonomous system (mathematics), a system of ordinary differential equations which does not depend on the inde ...
(for example, a system of corporate local area networks). This routing information can then be used to route
network-layer protocols like
IP.
Interior gateway protocols can be divided into two categories:
distance-vector routing protocols and
link-state routing protocols. Specific examples of IGPs include
Open Shortest Path First (OSPF),
Routing Information Protocol (RIP),
Intermediate System to Intermediate System (IS-IS) and
Enhanced Interior Gateway Routing Protocol (EIGRP).
By contrast,
exterior gateway protocols are used to exchange routing information ''between'' autonomous systems and rely on IGPs to resolve routes within an autonomous system.
Examples
Examples of distance-vector routing protocols:
*
Routing Information Protocol (RIP)
*
Routing Information Protocol Version 2 (RIPv2)
*
Routing Information Protocol Next Generation (RIPng), an extension of RIP version 2 with support for
IPv6
Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. I ...
*
Interior Gateway Routing Protocol (IGRP)
Examples of link-state routing protocols:
*
Open Shortest Path First (OSPF)
*
Intermediate system to intermediate system (IS-IS)
Advanced distance vector routing protocols have both the features of distance vector routing protocols and link-state routing protocols. One example is
Enhanced Interior Gateway Routing Protocol (EIGRP).
See also
*
Route analytics
Network monitoring is the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator (via email, SMS or other alarms) in case of outages or other trouble. Network monito ...
References
{{DEFAULTSORT:Interior Gateway Protocol
Routing protocols