Technical Documentation

Sending Release Messages When Clients Are Deleted

By default, when DHCP relay and relay proxy delete a client, they do not send a release message to the DHCP server. You can override the default behavior and configure DHCP relay and relay proxy to send a release message whenever they delete a client. The release message sent by DHCP relay and relay proxy includes option 82 information.

Note: In releases prior to JUNOS Release 10.2, DHCP relay sent a release message to the DHCP server due to the client-discover-match configuration. This is no longer the case. Starting with JUNOS Release 10.2 you must include the send-release-on-delete statement to configure DHCP relay and relay proxy to send the release message for client-discover-match configurations.

To send a release message:

  1. Specify that you want to configure overrides.
    [edit forwarding-options dhcp-relay]user@host# edit overrides
  2. Specify that you want DHCP relay and relay proxy to send a release message when clients are deleted.
    [edit forwarding-options dhcp-relay overrides]user@host# set send-release-on-delete

Published: 2010-04-15