Differences between InterDomain Routing and IntraDomain

What is Routing?

The process of determining a path for traffic inside a network or across or across different networks is known as routing. Routing occurs in a wide range of networks, including circuit-switched networks like the public switched telephone network (PSTN) and computer networks like the Internet.

Routing is the higher-level decision-making in packet switching networks that sends network packets from their source to their destination through intermediate network nodes using particular packet forwarding techniques.

The passage of network packets from one network interface to another is known as packet forwarding. Routers, gateways, and other network hardware devices are common intermediate nodes.

On the basis of the interaction of domains, the routing protocols can be either InterDomain or IntraDomain. Read through this article to find out how these two routing protocols are different from each other.

What is Intradomain Routing?

All routers inside a domain utilize an intradomain routing protocol to share routing information about the destinations that are accessible within the domain.

There are a number of intradomain routing protocols to choose from. A distance-vector protocol called RIP is used by several domains. Other domains utilize OSPF or IS-IS, which are link-state routing protocols. Finally, some domains utilize proprietary protocols like IGRP or EIGRP or use static routing.

Intradomain routing methods often have two goals. They begin by disseminating routing information that corresponds to the shortest path between two domain routers. Second, they must enable routers to recover rapidly from link and router failures.

What is Interdomain Routing?

An interdomain routing protocol's goal is to distribute routing information between domains. An interdomain routing protocol must distribute aggregated routing information for scalability considerations, and each domain is treated as a black box.

Difference between Interdomain and Intradomain Routing

The following table highlights the major differences between interdomain and intradomain routing protocols.

Key Interdomain Routing Intradomain Routing
Definition Interdomain Routing, as name suggests, is the protocol in which the Routing algorithm works within and in between the domains. Intradomain Routing is a protocol in which the Routing algorithm works only within the domains.
Information Required In case of Interdomain routing, the interaction is across various domains, so it requires information of components of other domains. Intradomain Routing has to interact within the domain, so it requires the information of only those components which are within the domain.
Protocols Used In Interdomain Routing, Interior-gateway protocols such as RIP (resource information protocol) and OSPF (open shortest path first) are being used. In Intradomain Routing, additional exterior-gateway protocols such as BGP (Border Gateway Protocol) are used.
Prerequisite Internet connectivity should be available both within the domain and in the domain with which the interaction is taking place. Internet connectivity should be available within the domain and during the transmission.
Complex and Dependent Interdomain Routing is more complex and more dependent as compared to Intradomain Routing. Intradomain Routing is less complex and less interdependent than Interdomain Routing.


To conclude, intradomain routing protocols are used within a domain, whereas interdomain routing protocols are used both within a domain as well as in between multiple domains.

Updated on: 23-Aug-2022

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