内部网关路由协议 (IGRP)：
内部网关路由协议是路由协议。它也是一种距离矢量路由协议。其中使用了贝尔曼福特算法。 IGRP 中的最少跳数是 255。
增强型内部网关路由协议 (EIGRP)：
增强型内部网关路由协议是类似于内部网关路由协议的路由协议。它是链路状态路由协议和向量路由协议。
IGRP和EIGRP的主要区别在于，内部网关路由协议是有类路由技术，而增强型内部网关路由协议是无类路由技术。
IGRP 和 EIGRP 的区别：
| S.NO | IGRP | EIGRP |
|---|---|---|
| 1. | IGRP stands for Interior Gateway Routing Protocol. | EIGRP stands for Enhanced Interior Gateway Routing Protocol. |
| 2. | Interior Gateway Routing Protocol is Classful routing technique. | While Enhanced Interior Gateway Routing Protocol is a classless routing technique. |
| 3. | IGRP is a slow convergence. | While it is a fast convergence. |
| 4. | In IGRP, Bellman ford algorithm is used. | While in this, Dual algorithm is used. |
| 5. | IGRP needs more or high bandwidth. | While EIGRP needs low or less bandwidth. |
| 6. | The least hop count in IGRP is 255. | While the least hop count in EIGRP is 256. |
| 7. | It provides 24 bits for delay. | While it provides 32 bits for delay. |