EIGRP is a Cisco-proprietary hybrid protocol that incorporates the best aspects of distance vector and link-state features. EIGRP keeps a topology table, it does not perform periodic route updates, and it does perform triggered updates. It is well suited to almost all environments, including LAN, point-to-point, and NBMA. The EIGRP split-horizon functionality can be disabled in NBMA environments. EIGRP is not suitable for dialup environments because it must maintain its neighbor relationships using periodic hello packets; sending these packets would mean that the dialup connections would have to stay up all the time.
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