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Hierarchy Level


Set the length of time that a node considers a neighbor reachable until another reachability confirmation is received from that neighbor.

After receiving a reachability confirmation from a neighbor, a node considers that neighbor reachable for a certain amount of time without receiving another confirmation. This mechanism is used for neighbor unreachability detection, a mechanism for finding link failures to a target node.


milliseconds—Reachability time limit.

  • Range: 0 through 3,600,000 milliseconds

  • Default: 0 milliseconds

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.