To set the interval during which at least one hello packet must be received from a neighbor before the router declares that neighbor as down, use the ip ospf dead-interval command. To restore the default, use the no form of this command.
ip ospf dead-interval seconds
no ip ospf dead-interval
seconds
|
Interval (in seconds) during which the router must receive at least one hello packet from a neighbor or that neighbor adjacency is removed from the local router and does not participate in routing. The range is from 1 to 65535, and the default is 40. The value must be the same for all nodes on the network.
|
The default for seconds is four times the interval set by the ip ospf hello-interval command.
Interface configuration mode
Release
|
Modification
|
---|---|
5.0(3)N1(1)
|
This command was introduced.
|
Use the ip ospf dead-interval command to set the dead interval that Open Shortest Path First (OSPF) advertises in hello packets. This value must be the same for all networking devices on a specific network.
Configure a shorter dead interval to detect down neighbors faster and improve convergence. Very short dead intervals could cause routing instability.
Use the show ip ospf interface command to verify the dead interval and hello interval.
This command requires the LAN Base Services license.
This example shows how to set the OSPF dead interval to 20 seconds:
Command
|
Description
|
---|---|
ip ospf hello-interval
|
Specifies the interval between hello packets that OSPF sends on the interface.
|
show ip ospf interface
|
Displays OSPF interface-related information.
|