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Dynamic Host Configuration Protocol

  • Support for persistent storage of DHCPv4 and DHCPv6 bindings over EVPN IRB (ACX5448, ACX5448-D, and ACX5448-M)—Starting in Junos OS Release 21.2R1, ACX5448, ACX5448-D, and ACX5448-M routers that are configured to function as a DHCP relay agent can also be configured to preserve the DHCPv4 and DHCPv6 subscriber bindings across reboots. Existing bindings are written to a local file in /var/preserve. After reboot, the binding table is populated with the contents of the file, and the router identifies each subscriber that was on the deleted interface, and resumes normal packet processing for subscribers when the interface is restored. To preserve the subscriber binding information, enable the perisistent-storage statement at the [edit system services dhcp-local-server] hierarchy level.

    [See Preserving Subscriber Binding Information and DHCPv6 Relay Agent Overview.]