What is the difference between IGRP and BGP?

Let us understand what the Interior Gateway Routing Protocol (IGRP) is.


IGRP represents the Interior Gateway Routing Protocol. It is a protocol that was generally developed for routing by Cisco Systems in the 1980s. The objective of IGRP is to develop IGRP to support a routing protocol to be used with the autonomous system architectures.

IGRP uses a sequence (vector) of metrics. Internetwork delay, bandwidth, dependability, and load are all part of the routing decision. The network controller can set the weighting element for each of these metrics. IGRP uses the authority-set or the default weightings to necessarily calculate optimal routes.

IGRP supports a wide range of its metrics. Wide metric ranges enable an adequate metric setting in internetworks with extensively changing performance characteristics. The metric elements are connected in a user-definable algorithm. As a result, network administrators can hold route selection in a perceptive form.

It can support additional flexibility and allows multipath routing. Dual equal-bandwidth lines can run an individual stream of traffic in a round-robin fashion, with automatic permutation to the second line if one line goes down. Multiple paths can be used even if the metrics for the paths are dissimilar.


BGP represents the Border Gateway Protocol. It is a standardized gateway protocol that changes routing information across autonomous systems (AS). When one network router is connected to multiple networks, it cannot determine which network is the best network to send its information to by itself.

It can consider all peering partners that a router has and share traffic to the router adjacent to the data’s destination. This connection is applicable because BGP enables peers to communicate their routing data and then saves that information in a Routing Information Base (RIB).

The objective of BGP is to discover any path to the destination that is loop-free. This is different from intradomain routing protocols common objectives such as discovering an optimal route to the destination depends on a particular link metric.

The routers that linked other ASs are known as border gateways. The service of the border gateways is to forward packets between ASs. Each AS has slightly one BGP speaker. BGP speakers change reachability data among ASs.

An independent system is a set of networks that appears under the single common management domain. It is said that that it is a set of routers under the single management domain. For instance, an organization can include several routers having different areas, but the single independent number system will identify them.