OSPF Hello and Dead Intervels

The hello intervals is how often a router sends hello messages. The dead interval is how long to wait before considering a neighbor dead from lack of hello messages; this is 4x the hello interval by default.


Broadcast: 10 sec 40 sec
Point to Point: 10 sec 40 sec
NBMA: 30 sec 120 sec
Point to Multipoint: 30 sec 120 sec


Administrator can change the hello intervals with below command.


R1(config-if)#ip ospf hello-interval X