Enabling client offline detection on the DHCP relay agent
About client offline detection on the DHCP relay agent
The client offline detection on the DHCP relay agent detects the user online status based on the ARP entry aging. When an ARP entry ages out, the DHCP client offline detection feature deletes the relay entry for the IP address and sends a RELEASE message to the DHCP server.
Restrictions and guidelines
The feature does not function if an ARP entry is manually deleted.
Procedure
Enter system view.
system-view
Enable the relay agent to record relay entries.
dhcp relay client-information record
By default, the relay agent does not record relay entries.
Without relay entries, client offline detection cannot function correctly.
Enter interface view.
interface interface-type interface-number
Enable the DHCP relay agent.
dhcp select relay
By default, when DHCP is enabled, an interface operates in the DHCP server mode.
Enable client offline detection.
dhcp client-detect
By default, client offline detection is disabled on the DHCP relay agent.