EIGRP (Enhanced Interior Gateway Routing Protocol) is Cisco's dynamic routing protocol. It uses the DUAL algorithm (Diffusing Update Algorithm) and combines distance-vector simplicity with link-state-grade convergence. Originally Cisco-only; now an open IETF informational standard (RFC 7868). Modern Cisco IOS XE uses "named mode" syntax which replaces the older autonomous-system classic mode. This lab configures EIGRP named-mode AS 100 across R1, R2, R3 of the base topology.
What you will learn
- The named-mode EIGRP syntax (modern) vs classic mode (legacy)
- How to configure the autonomous system and routing-process router-id
- The role of address-family unicast within the named-mode hierarchy
- Per-interface passive/active configuration with af-interface
- How to read
show ip eigrp neighborsandshow ip eigrp topology
What this lab does NOT cover
- Feasible successors and DUAL recalculation - next lab, ipc-11
- EIGRP authentication (similar pattern to OSPF, separate lab)
- EIGRP route summarization
Topology
Download the CCNA Base Topology .yaml
The PingLabz CCNA Base Topology - 3 iol-xe routers + 1 alpine + 1 ioll2-xe switch.
