Supported Platforms
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 an interface delete event occurs, such as a DPC reboot or failure. 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, DHCPv6 local server, and DHCP relay clients in all logical routers and 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 using one of the following commands, as appropriate:
