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Configuring a Timer to Delay Multiple Exit Discriminator IGP Updates

You can configure a timer to delay update of the multiple-exit discriminator (MED) path attribute calculated for BGP groups or peers that have been configured with the metric-out igp statement. If the MED changes before the timer expires because of a change in the IGP metric associated with the route next hop, the BGP peer sends an update only if the MED is lower than the previously advertised value or another attribute associated with the route has changed, or if the BGP peer is responding to a refresh route request.

To configure an interval to delay MED IGP updates, include the med-igp-update-interval statement:




med-igp-update-interval minutes;

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

The default interval is 10 minutes. The interval that you can configure is in the range from 10 through 600.

You must separately configure the BGP group or peer that you want to delay sending MED IGP updates for the configured interval. For more information, see Configuring the Multiple Exit Discriminator Metric.

Note: If you have nonstop routing enabled and a switchover occurs, the delayed MED updates might be advertised as soon as the switchover occurs. For more detailed information about nonstop routing, see the JUNOS High Availability Configuration Guide.

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