• Deleting DHCP Local Server and DHCP Relay Override Settings
• Extended DHCP Local Server Overview
• Extended DHCP Relay Agent Overview
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: You must include the send-release-on-delete statement to configure
DHCP relay and relay proxy to send the release message when the
client-discover-match statement is included.
You can use the [edit forwarding-options dhcp-relay dhcpv6] hierarchy level to override
the default behavior for DHCPv6 relay agent.
To send a release message:
1. Specify that you want to configure override options.
•
For DHCP relay agent:
[edit forwarding-options dhcp-relay]
user@host# edit overrides
•
For DHCPv6 relay agent:
[edit forwarding-options dhcp-relay dhcpv6]
user@host# edit overrides
2. Specify that you want DHCP relay and relay proxy (or DHCPv6 relay agent) to send
a release message when clients are deleted.
[edit forwarding-options dhcp-relay overrides]
user@host# set send-release-on-delete
Related
Documentation
Extended DHCP Relay Agent Overview•
• Overriding the Default DHCP Relay Configuration Settings on page 373
Disabling Automatic Binding of Stray DHCP Requests
DHCP requests that are received but have no entry in the database are known as stray
requests. By default, DHCP relay, DHCP relay proxy, and DHCPv6 relay agent attempt
to bind the requesting client by creating a database entry and forwarding the request to
the DHCP server. If the server responds with an ACK, the client is bound and the ACK is
forwarded to the client. If the server responds with a NAK, the database entry is deleted
381Copyright © 2017, Juniper Networks, Inc.
Chapter 11: Configuring DHCP and DHCPv6 Relay Agent
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