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Modifying the Hello Interval

Routers send hello packets at a fixed interval on all interfaces, including virtual links, to establish and maintain neighbor relationships. This interval, which must be the same on all routers on a shared network, is advertised in the hello interval field in the hello packet. By default, the router sends hello packets every 10 seconds.

To modify how often the router sends hello packets out of an interface, include the hello-interval statement:




hello-interval seconds;

For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.

On nonbroadcast networks, the router sends hello packets every 120 seconds until active neighbors are detected by default. This interval is long enough to minimize the bandwidth required on slow WAN links. To modify this interval, include the poll-interval statement:




poll-interval seconds;

Note: The poll-interval statement is valid for OSPFv2 only.

For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.

Once the router detects an active neighbor, the hello packet interval changes from the time specified in the poll-interval statement to the time specified in the hello-interval statement.

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