EIGRP Hello and Dead Intervals.

EIGRP does not form a neighbor relationship with mismatched k values; however, a neighbor can be formed with mismatched hellos and dead timers.An Administrator Can Manipulate both Hello and Dead time Intervells


Router(config-if)ip hello-interval eigrp as_number interval_in_seconds— Use this interfacecommand to change the hello timer for EIGRP. The default value of this command is interface dependant.By default, hello packets are sent every 5 seconds. The exception to this is low-speed,nonbroadcast multiaccess media (NBMA), where it is 60 seconds. Low-speed is defined as rates of T1 (1.544 Mbps) or slower.

Router(config-if)ip hold-time eigrp as_number holdown_timer_in_seconds— Use this command to change the EIGRP hold timer for routes received by this interface. The timer has a default value of 180 seconds for low-speed NBMA networks and 15 seconds for all other networks.