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Routing & Switching · Intermediate

EIGRP Hello and Hold Timers

EIGRP sends hellos every 5 seconds (60 on slow NBMA) and declares a neighbor down after the hold time (15 or 180 seconds).

Definition

The hold time is advertised to the neighbor, which uses it to time out the sender. Timers do not need to match on both sides, but a hold time shorter than the peer's hello interval causes flapping.

Example

ip hello-interval eigrp 100 2 ; ip hold-time eigrp 100 6

Exam tip

Unlike OSPF, mismatched EIGRP timers do not block adjacency.

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