configure ospf area timer

configure ospf area area-identifier timer retransmit-interval transit-delay hello-interval dead-interval {wait-timer-interval}

Description

Configures the timers for all interfaces in the same OSPF (Open Shortest Path First) area.

Syntax Description

area-identifier	Specifies an OSPF area.
retransmit-interval	Specifies the length of time that the router waits before retransmitting an LSA that is not acknowledged. The range is 1–3,600 seconds.
transit-delay	Specifies the length of time it takes to transmit an LSA packet over the interface. The range is 1–3,600 seconds.
hello-interval	Specifies the interval at which routers send hello packets. The range is 1–65,535 seconds.
dead-interval	Specifies the interval after which a neighboring router is declared down due to the fact that hello packets are no longer received from the neighbor. The range is 1–2,147,483,647 seconds.
wait-timer-interval	Specifies the interval between the interface coming up and the election of the DR and BDR. Usually equal to the dead timer interval.

Default

retransmit interval—Default: 5
transit delay—Default: 1
hello interval—Default: 10
dead interval—Default: 40
wait timer interval—Default: dead interval

Usage Guidelines

Configuring OSPF timers on a per-area basis is a shorthand for applying the timers and authentication to each VLAN (Virtual LAN) in the area at the time of configuration. If you add more VLANs to the area, you must configure the timers and authentication for the new VLANs explicitly.

Specify the following:

retransmit interval—If you set an interval that is too short, unnecessary retransmissions will result.
transit delay—The transit delay must be 1 second or greater.
hello interval—Smaller times allow routers to discover each other more quickly, but also increase network traffic.
dead interval—This interval should be a multiple of the hello interval.
wait timer interval—This interval is required by the OSPF standard to be equal to the router dead interval. Under some circumstances, setting the wait interval to smaller values can help OSPF routers on a broadcast network to synchronize more quickly at the expense of possibly electing an incorrect DR or BDR. This value should not be set to less than the hello interval. The default value is equal to the router dead interval.

Example

The following command sets the timers in area 0.0.0.2:

# configure ospf area 0.0.0.2 timer 10 1 20 200

History

This command was first available in ExtremeXOS 10.1.

Platform Availability

This command is available on platforms with an Advanced Edge or Core license as described in the ExtremeXOS 22.7 Feature License Requirements document.

Published July 2019prev | next

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