Configuring OSPF Packet Timer

By changing the OSPF packet timer, you can adjust the convergence speed of the OSPF network and the network overload caused by protocol packets.

Both Hello and Dead timer are restored to the default settings after the network type is changed.
It is necessary to keep the consistency of the Hello timers between OSPF neighbors.
Note that the value of the Hello timer is inversely proportional to route convergence speed and network load.
For the same interface, the dead time should be at least four times as long as the interval of Hello packets.
Do not set the LSA retransmission interval too small. Otherwise, unnecessary retransmission may be caused. It must be greater than the time for a packet to be transmitted a round between two routers.

Access the system view.
system-view
Access the interface view.
interface interface-type { interface-number | interface-number.subinterface-number }
Set an interval for sending Hello packets on the interface.
ospf timer hello interval
Set an interval for sending Poll packets on the NBMA interface.
ospf timer poll interval
Configure the dead time during which the adjacent relationship is invalid.
ospf timer dead interval
Set an interval for re-transmitting LSAs between the adjacent routers.
ospf timer retransmit interval

After a router sends an LSA to its neighbor, it waits for the acknowledgement packet from its neighbor. If no acknowledgement packet is received from its neighbor in the retransmission interval, it retransmits the LSA.