Routing protocols are essential components of computer networks. Different routing protocols are designed to meet diverse networking needs. Two common types of routing protocols are Exterior Gateway Protocol (EGP) and Interior Gateway Protocol (IGP). In this article, we will compare and decode these two protocols.
Overview of EGP and IGP
EGP is a protocol used to route data between autonomous systems (ASs) in a network. AS is a collection of networks that are managed and operated as a single entity. EGP routes data between different ASs by using different metrics, such as the number of hops, delay, and bandwidth. EGP is an example of an inter-domain routing protocol.
On the other hand, IGP is an intra-domain routing protocol. It is used to route data within the same AS. IGP is based on different algorithms, such as Dijkstra’s algorithm, Link-State Routing Protocol (LSRP), and Routing Information Protocol (RIP). IGP uses metrics such as distance, bandwidth, and delay to determine the best route for data transfer.
Comparison between EGP and IGP
1. Functionality
The primary task of EGP is to move data between different ASs. EGP is an inter-domain routing protocol and operates on the border routers that connect ASs. On the other hand, the primary task of IGP is to move data between different hosts within the same AS. IGP is an intra-domain routing protocol and operates on the Interior Gateway Routers (IGRs) within an AS.
2. Convergence Time
EGP has a higher convergence time compared to IGP. This is because EGP operates on a large-scale network and must communicate with different routers in different ASs. This can cause a delay in the transfer of data. IGP, on the other hand, operates within a single AS and has a faster convergence time.
3. Routing Table Size
EGP requires a larger routing table size compared to IGP. This is because EGP must route data between different ASs, which requires a larger table to store all the necessary information. IGP, on the other hand, routes data within the same AS, which requires a smaller table.
4. Scalability
EGP is more scalable compared to IGP. This is because EGP has a hierarchical structure that allows for the addition of new ASs without affecting the routing within other ASs. IGP, on the other hand, is limited in scalability due to the limitations of the AS.
Decoding EGP and IGP
EGP and IGP are essential components of computer networks. They allow for the efficient transfer of data within and between different ASs. EGP and IGP differ in functionality, convergence time, routing table size, and scalability.
Choosing between EGP and IGP depends on the needs of the user. Large-scale networks that require routing between different ASs should opt for EGP, while smaller networks that require routing within a single AS should opt for IGP. Both protocols provide efficient routing solutions when used within their respective domains.