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    Subscriber Binding Retention During Interface Delete Events

    You can configure the router to maintain DHCP subscribers when an event occurs that normally results in the router deleting the subscriber. For example, by default, the router logs out DHCP subscribers when a Packet Forwarding Engine reboot or crash occurs. However, if you configure the router to maintain subscribers, the router identifies each subscriber that was on the deleted interface, and resumes normal packet processing for the subscriber when the interface is restored.

    Note: Subscribers are logged off as usual when their lease expires, even If the router is configured to maintain subscribers and the subscriber is on a deleted interface that has not yet been restored.

    You configure the router to maintain subscribers on a global basis— the configuration applies to DHCP local server in all routing instances. When you enable the maintain subscribers feature, the router applies the feature to existing subscribers as well as subscribers who later connect.

    If the maintain subscribers feature is enabled on the router, you can explicitly delete a subscriber binding and log out the subscriber by either specifying a lease expiration timeout or by using the following command:

    clear dhcp server binding

    Modified: 2017-08-31