What are the key features of EIGRP and how does it differ from other routing protocols?

Key Features of EIGRP Compared to Other Routing Protocols

In this interview question, the key features of EIGRP (Enhanced Interior Gateway Routing Protocol) and its differences from other routing protocols are vital to understand. EIGRP is a distance vector routing protocol developed by Cisco with advanced features that set it apart. Here are the main features that make EIGRP unique:

1. Rapid Convergence:

EIGRP uses Diffusing Update Algorithm (DUAL) to quickly converge in the event of topology changes, reducing network downtime.

2. Enhanced Metric Calculation:

EIGRP calculates its metric based on bandwidth, delay, load, and reliability, providing more accurate path selection than other protocols.

3. Support for VLSM and Summarization:

EIGRP supports Variable Length Subnet Masking (VLSM) and route summarization, enabling efficient use of IP addressing space.

4. Reduced Network Traffic:

EIGRP minimizes network traffic by sending updates only when there are topology changes, unlike traditional distance vector protocols.

Differences from Other Routing Protocols:

EIGRP differs from other routing protocols like OSPF and RIP in several ways:

• While OSPF is a link-state routing protocol, EIGRP is a hybrid protocol combining features of both distance vector and link-state protocols.
• Unlike RIP, EIGRP supports classless routing and VLSM, offering more flexibility in network design.
• EIGRP utilizes a neighbor-based protocol, forming neighbor adjacencies to exchange routing information efficiently.

Understanding the key features and differences of EIGRP is essential for network administrators working with routing protocols in complex network environments. Mastering EIGRP can lead to more efficient routing, faster convergence, and better network performance.