configure ospfv3 virtual-link timer

configure ospfv3 virtual-link {routerid} router_identifier {area} area_identifier timer {retransmit-interval} retransmit_interval {transit-delay} transit_delay {hello-interval} hello_interval {dead-interval} dead_interval


Configures the timers for a virtual link.

Syntax Description

router_identifier Specifies the router ID of the other end of the link.
area_identifier Specifies an OSPFv3 area, a four-byte, dotted decimal number.
retransmit_interval Specifies the length of time that the router waits before retransmitting an LSA that is not acknowledged. The range is 1 to 3600 seconds.
transit_delay Specifies the length of time it takes to transmit an LSA packet over the interface. The range is 1 to 3600 seconds.
hello_interval Specifies the interval at which routers send hello packets. The range is 1 to 65535 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 to 65535 seconds.


Usage Guidelines

In OSPFv3, all areas must be connected to a backbone area. If the connection to the backbone is lost, it can be repaired by establishing a virtual link.

The smaller the hello interval, the faster topological changes will be detected, but more routing traffic will ensue.

The setting of the retransmit interval should be conservative, or needless retransmissions will result. The value should be larger for serial lines and virtual links.

The transmit delay value should take into account the transmission and propagation delays for the interface.



The wait interval is not separately configurable. It is always equal to the dead interval.


The following command sets the timers on the virtual link to router transiting area

configure ospfv3 virtual-link area timer 10 transit-delay 1 hello‑interval 20 dead-interval 200


This command was first available in ExtremeXOS 11.2.

Platform Availability

This command is available on platforms with an Advanced Edge or Base license, or higher, as described in the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.