EIGRP Named-Mode on Cisco IOS XE: Hands-On Lab

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 neighbors and show 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.

Download CCNA Base Topology

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Lab ipc-10 - EIGRP Named-Mode AS 100