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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
dead-interval (OSPF virtual link)
dead-interval (OSPF virtual link)
To set the interval during which at least one hello packet must be received from a neighbor on an Open
Shortest Path First (OSPF) virtual link before the router declares that neighbor as down, use the dead
interval command. To restore the default, use the no form of this command.
dead-interval seconds
no dead-interval
Syntax Description
Command Default 40 seconds
Command Modes Virtual link configuration mode
Command History
Usage Guidelines The dead interval advertised in OSPF hello packets must be the same for all networking devices on the
virtual link. The default value for seconds is four times the interval set by the hello-interval command.
You can configure a shorter dead interval (seconds) to detect a down neighbor faster and improve
convergence. A shorter dead interval may lead to virtual link instability by incorrectly declaring a slow
neighbor as down.
Use the show ip ospf virtual-links command to verify the dead interval.
This command requires the LAN Base Services license.
Examples This example shows how to configure the OSPF dead interval to 20 seconds:
switch# configure terminal
switch(config)# ospf 201
switch(config-router)# area 99 virtual-link 192.0.2.4
switch(config-router-vlink)# dead-interval 20
switch(config-router-vlink)#
seconds Interval (in seconds) during which the router must receive at least one hello
packet from a neighbor or that neighbor is removed from the peer list and
does not participate in routing. The range is from 1 to 65535. The value must
be the same for all nodes on the virtual link.
Release Modification
5.0(3)A1(1) This command was introduced.
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