OSPF Timer Configuration
The next OSPF timers could be configured
Hiya interval
OSPF enabled gadgets ship howdy packets at a hard and fast interval on all OSPF enabled interfaces to ascertain and preserve neighbor relationships. The howdy interval is the size of time, in seconds, earlier than the routing gadget sends a howdy packet out of an interface. This interval should be the identical on all routing gadgets on a shared community. By default, the routing gadget sends howdy packets each 10 seconds (broadcast and point-to-point networks) and 30 seconds (nonbroadcast a number of entry (NBMA) networks).
Associated- OSPF LSA sort
To specify the interval between howdy packets that the Cisco IOS software program sends on the interface, use the “ip ospf hello-interval” command in interface configuration mode. To return to the default time, use the no type of this command.
Ip ospf hello-interval seconds
no ip ospf hello-interval
Examples
The next instance units the interval between howdy packets to twenty seconds:
interface ethernet 0
ip ospf hello-interval 20
Associated- OSPF Interview Questions
Lifeless Interval
If an OSPF Layer 3 gadget doesn’t obtain a howdy packet from a neighbor inside a hard and fast time, the routing gadget understands that the neighbor is non-operational. The useless interval specifies the size of time, in seconds, that the routing gadget waits earlier than declaring {that a} neighbor is unavailable. That is an interval throughout which the routing gadget receives no howdy packets from the neighbor. This interval should be the identical on all routing gadgets on a shared community. By default, this interval is 4 instances the default howdy interval, which is 40 seconds (broadcast and point-to-point networks) and 120 seconds (NBMA networks).
Associated- OSPF Neighbor States
To set the interval at which howdy packets should not be seen earlier than neighbors declare the router down, use the “ip ospf dead-interval” command in interface configuration mode. To return to the default time, use the no type of this command.
ip ospf dead-interval seconds
no ip ospf dead-interval
Examples
The next instance units the OSPF useless interval to 90 seconds:
Interface ethernet 1
ip ospf dead-interval 90
Retransmit Interval
When OSPF sends an commercial to an adjoining router, it expects to obtain an acknowledgment from that neighbor. If no acknowledgment is acquired, the router will retransmit the commercial to its neighbor. The retransmit-interval timer controls the variety of seconds between retransmissions.
To specify the time between link-state commercial (LSA) retransmissions for adjacencies belonging to the interface, use the “ip ospf retransmit-interval” command in interface configuration mode. To return to the default worth, use the no type of this command.
ip ospf retransmit-interval seconds
no ip ospf retransmit-interval
Examples
The next instance units the retransmit interval worth to eight seconds:
interface ethernet 2
ip ospf retransmit-interval 8
OSPF Timers Sorts
Under desk enumerates the OSPF timers sorts and corresponding worth in seconds on numerous Community sorts –
