What is the default dead time of OSPF on a broadcast network?
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.
What is the default OSPF priority?
1
Default priority for an OSPF interface is 1. The range is from 0 to 255. 0 means that the interface does not involve in the DR election. The following command configures a priority value on an interface.
How does OSPF set priority value?
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.
What is the default dead interval?
Dead Interval This interval must be the same on all routing devices on a shared network. By default, this interval is four times the default hello interval, which is 40 seconds (broadcast and point-to-point networks) and 120 seconds (NBMA networks).
What is wait timer in OSPF?
The Wait Timer is used in OSPF to allow newly-booted routers to determine the DR/BDR on their multiaccess segments. It allows these routers to wait to see if any DR/BDRs exist on those links, before declaring themselves as the DR/BDR.
What is the OSPF default frequency in seconds?
What is the OSPF default frequency, in seconds, at which a Cisco router sends hello packets on a multi-access. multi-access network? is 30 seconds.
What does the IP OSPF priority command do?
Description. This command sets the priority for the router within the OSPF area to which the interface is connected. The priority determines which routers are selected as the area’s DR and BDR, and can range from 0 to 255.
What is the purpose of dead timer in OSPF protocol?
The dead-timer is typically four times the amount of the hello timer to give time for packet loss/drops due to network issues and/or quality of service policies. In this lab you will configure the OSPF hello and dead on the point to point link between R2 and R3 to 1 second hello and 4 second dead.
What is prefix suppression in OSPF?
An OSPF interface by default advertises all its prefixes in LSAs. You can suppress interfaces from advertising all its prefixes to speed up OSPF convergence. This function also helps improve the network security by preventing IP routing toward the suppressed networks.
Do OSPF timers need to match?
OSPF Hello and Dead timers must match on the two routers.
What is the default administrative distance of OSPF?
110
The range for administrative distance is 0–255. The default value is 120 for RIP routes and 110 for OSPF routes.
How do I change the OSPF routerdeadinterval(dead timer)?
To change the OSPF RouterDeadInterval(Dead Timer), you use the following interface level command: To set the interval during which at least one hello packet must be received from a neighbor before the router declares that neighbor down, use the ip ospf dead-interval command in interface configuration mode.
What is the Hello and dead interval in OSPF?
The hello and dead interval values can be different depending on the OSPF network type. On Ethernet interfaces you will see a 10 second hello interval and a 40 second dead interval. Let’s take a look at an example so we can see this in action.
How do I change the Hello timer in OSPF?
To change the OSPF HelloInterval (Hello Timer), you use the following interface level command: ip ospf hello-interval. To specify the interval between hello packets that the Cisco IOS software sends on the interface, use the ip ospf hello-interval command in interface configuration mode.
How do I return to the default time in OSPF?
To return to the default time, use the no form of this command. When OSPF sends an advertisement to an adjacent router, it expects to receive an acknowledgment from that neighbor. If no acknowledgment is received, the router will retransmit the advertisement to its neighbor.