The router discovery server sends router advertisement messages, which include route information and indicate to network hosts that the router is still operational. The server sends these messages periodically, with a time range defined by minimum and maximum values. By default, the server sends router advertisements every 400 to 600 seconds. To modify these times, include the min-advertisement-interval and max-advertisement-interval statements:
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min-advertisement-interval seconds;
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max-advertisement-interval seconds;
For a list of hierarchy levels at which you can configure these statements, see the statement summary sections for these statements.