Yes, this EIGRP PDF is free. No payment, no trial.
It’s a cheat sheet and a study guide in one. You get EIGRP from the ground up: how it picks a path, how DUAL works, the timers, the tables, authentication, and the config commands you’ll actually type on a router. Written for CCNA and CCNP students, useful for anyone who touches Cisco routing.
Most EIGRP notes online are either too thin or buried in a 900-page textbook. This one sits in the middle. Everything that matters, none of the filler.
You’ll see the packet types, the DUAL metric formula, feasible distance vs advertised distance, and a worked path-selection example with three routers. Print it, mark it up, keep it beside your lab.
What’s inside
- EIGRP fundamentals – Cisco origin, advanced distance vector (hybrid) behaviour, protocol number 88, multicast 224.0.0.10
- The six message types – Hello, Query, Reply, Request, Update, and ACK, plus which ones are reliable
- Timers that matter – hello 5s / hold 15s on fast links, 60s / 180s on slow links, and the Frame Relay catch
- DUAL metric formula – bandwidth, delay, load, reliability, and the K-values, shown with the full and simplified equations
- Feasible distance vs advertised distance – successor and feasible successor explained with a 3-router worked example (KingKong, Ann, Carl)
- The three EIGRP tables – neighbor, topology, and routing, plus route states (Passive, Active, SIA)
- Authentication – plaintext vs MD5, with a real key-chain config
- EIGRP vs OSPF – side-by-side comparison table
- Configuration commands –
router eigrp,network, and the show commands you need for verification - Fine-tuning – stub routers, route summarization, and unequal-cost load balancing with
variance - Named EIGRP mode – address-family config and how to migrate from classic mode
Who it’s for
- CCNA candidates learning routing protocols for the first time
- CCNP Enterprise (ENARSI) students who need EIGRP fresh before the exam
- Network techs setting up or troubleshooting EIGRP on live Cisco gear
- Anyone comparing EIGRP and OSPF who wants the differences on one page
If your exam is booked, this is the last-minute refresher you keep open the night before.
