Large-Scale IP Network Solutions (CCIE Professional Development)

Adjusting Enhanced IGRP Parameters

Enhanced IGRP sends periodic hellos to detect its neighbors. By default, a hello packet is sent every five seconds on all LAN and point-to-point interfaces and sent every 60 seconds on non-broadcast multiaccess media. Slower links are considered T1 or lower. To change this default, the command is as follows:

int serial 0ip hello-interval eigrp 1 15

One is the autonomous-system number, and 15 seconds is the hello time.

Holdtime is advertised in the hello packet to inform the neighbor of the amount of time it should consider a route valid from a specific sender. The default behavior for holdtime is three times the hello, so if a router does not receive three hellos from the neighbor, the message is placed ...