What is the purpose of dead interval timer in OSPF?
What is the purpose of dead interval timer in OSPF?
OSPF uses hello packets and two timers to check if a neighbor is still alive or not: Hello interval: this defines how often we send the hello packet. Dead interval: this defines how long we should wait for hello packets before we declare the neighbor dead.
What is the default dead interval timer for an OSPF router?
40 seconds
The default values are 10 seconds for the hello time, and 40 seconds for the dead time. The usual rule of thumb with OSPF is to keep the dead time value four times the hello interval.
Why OSPF is not working?
Make sure that the interfaces at both ends are configured to support OSPF. There could be a mismatch in the OSPF Network Type. Verify that Hello and Dead timers match on each end of the link. Neighboring interfaces must be in the same OSPF Area.
Do OSPF timers have to match?
The OSPF process ID (on the router ospf command) do not have to match.
Which command can be used to view the OSPF Hello and dead time interval?
Explanation: The OSPF hello and dead timers can be configured per interface. Hence, the correct command used to view the timers is the show ip ospf interface command.
How do I set priority in OSPF?
Use the ip ospf priority [1 – 255] command to set the priority to a value between 1 and 255. Use the ip ospf priority 0 command to configure the router to never function as the designated router or backup designated router. Use the no ip ospf priority command to set the priority at the default value of 1.
How can I check my OSPF status?
To display Open Shortest Path First (OSPF)-related interface information, use the show ip ospf interface command. Usage Guidelines Use the show ip ospf interface command to display the OSPF status for the interface. This command requires the LAN Base Services license.
How do I debug OSPF?
To display information about each OSPF packet that is received, use the debug ip ospf packet privileged EXEC command. The no form of this command disables the debugging output. The debug ip ospf packet command produces one set of information for each packet that is received.
Which command can be used to verify the timers that have been configured on an OSPF interface?
To verify the OSPF timers on a particular interface you’ll use the show ip ospf interface interfacename#/#.
What is the highest priority in OSPF?
Setting Priority for the Selection of the Designated Router In multi-access networks the router with the highest priority value is chosen as the DR which acts as the central point of LSAs exchange. The priority command is assigned on an interface. Default priority for an OSPF interface is 1. The range is from 0 to 255.
What is DR and BDR election in OSPF?
In an OSPF broadcast network, OSPF elects one router to serve as the designated router (DR) and another router on the segment to act as the backup designated router (BDR). This minimizes the amount of repetitive information that is forwarded on the network. OSPF forwards all messages to the designated router.