Enhanced Interior Gateway Routing Protocol is a proprietary Interior Gateway Protocol that was developed by Cisco. EIGRP includes traditional Distance Vector characteristics, such as Split Horizon, as well as characteristics that are similar to those used by Link State routing protocols, such as incremental updates.
Although EIGRP has Link State routing protocol characteristics, EIGRP falls under the Distance Vector routing protocol classification and is referred to as an advanced Distance Vector routing protocol instead. EIGRP runs directly over IP using protocol number 88. The ROUTE exam objective covered in this chapter is:
- Implement an EIGRP based solution, given a network design and a set of requirements
This chapter contains the following sections:
- Cisco EIGRP Overview and Fundamentals
- EIGRP Configuration Fundamentals
- EIGRP Messages
- EIGRP Neighbor Discovery and Recovery
- Metrics, DUAL, and the Topology Table
- Equal Cost and Unequal Cost Load Sharing
- Default Routing Using EIGRP
- Split Horizon in EIGRP Networks
- EIGRP Stub Routing
- Securing EIGRP Protocol Messages
- EIGRP Route Summarization
- Understanding Passive Interfaces
- Understanding the use of the EIGRP Router ID
- EIGRP Logging and Reporting
- Chapter summary