Configuring the Delay Before Neighbor-Discovery Neighbors Mark the Router as Down
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.
To modify the reachable time limit, include the reachable-time statement:
reachable-time milliseconds;
For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.
By default, the reachable time period is 0 milliseconds.
