ip ospf hello-interval

Configures the hello interval, which is the length of time between the transmission of hello packets that this interface sends to neighbor routers.
Syntax
ip ospf hello-interval interval
no ip ospf hello-interval
Command Default

The default value is 10 seconds.

Parameters
interval
Hello interval in seconds. Valid values range from 1 through 65535.
Modes

Interface subtype configuration mode

Usage Guidelines

If you change the hello interval, the dead interval is automatically changed to a value that is four times that of the new hello interval, unless the dead interval is also explicitly configured using the ip ospf dead-interval command.

The recommended setting is that:

  • The dead interval is four times that of the hello interval.
  • The hello interval is ¼ times that of the dead interval.
  • If the OSPF hello interval and dead interval are set to more aggressive levels than 1:4 seconds respectively, the OSPF protocol might flap when the write memory command is used or in the case of any high CPU.

The running-config command displays only explicitly configured values of the dead interval, which means that a value that was automatically changed as the result of a hello-interval change is not displayed.

The no form of the command restores the default value.

Examples

The following example sets the hello interval to 50 on a specific OSPFv2 virtual Ethernet (VE) interface. 

device# configure terminal
device(config)# interface ve 1
device(config-vif-1)# ip ospf hello-interval 50
History
Parent topic: Commands I