Preserving Subscriber Binding Information
When ACX series router functioning as a DHCP local server reboots, by default, all the subscriber binding information is lost. You can configure ACX series router to preserve the subscriber binding information to a file in /var/preserve and when the router reboots, the DHCP local server reads the file and restores the subscriber binding information and resumes normal packet processing for the subscriber.
The persistent-storage statement under the [edit system services dhcp-local-server] hierarchy level enables you to store subscriber binding information. The persistent-storage statement is configured for each routing instance.
The persistent-storage statement under the [edit system processes dhcp-service] hierarchy level allows you to assign a name for the file. By default, the file is named as jdhcpd_client_data. The persistent-storage statement under the [edit system processes dhcp-service] hierarchy level allows you to configure the frequency (between 1 to 48 hours) to backup the file. By default, a new file is generated every 24 hours from the commit time. On committing the persistent-storage statement, the existing file will be renamed with a new file in the /var/preserve directory.
A commit error will be shown if you try to configure the file with a name that is already present in the /var/preserve directory.