EIGRP Stub Routing for Hub-and-Spoke
EIGRP stub routing makes hub-and-spoke topologies scale. The five stub options, query suppression, DMVPN integration, and the production patterns for branch deployments.
EIGRP
Latest posts
EIGRP vs OSPF: When to Use Each
EIGRP vs OSPF in 2026. The technical differences, the convergence story, vendor reality (EIGRP is still Cisco-only in practice), and the design implications for new vs existing networks.
EIGRP Configuration on Cisco IOS XE: Classic and Named Mode
EIGRP configuration on Cisco IOS XE: classic mode, named mode, network statements, passive-interface default, summarization, HMAC-SHA-256 authentication, and the production template.
EIGRP Metric and K Values Explained
The EIGRP composite metric formula, the five K values and why never to change them, the 64-bit wide metric for modern interfaces, and how to verify metrics in show output.
EIGRP DUAL Algorithm Deep Dive: Successors, Feasible Successors, FD, RD
DUAL gives EIGRP sub-second failover via pre-computed feasible successors. The four key concepts (successor, FS, FD, RD), the feasibility condition that prevents loops, active states, and queries.