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Syntax (QFX Series)

Hierarchy Level


Enable or disable the insertion of the DHCP relay agent information option (option 82) in DHCP packets destined for a DHCP server.

To enable insertion of option 82 information in DHCP packets, you must specify at least one of the circuit-id or remote-id statements.

You can use the relay-option-82 statement and its subordinate statements at the [edit forwarding-options dhcp-relay] hierarchy level to control insertion of option 82 information globally, or at the [edit forwarding-options dhcp-relay group group-name] hierarchy level to control insertion of option 82 information for a named group of interfaces.

To restore the default behavior (option 82 information is not inserted into DHCP packets), use the delete relay-option-82 statement.

Starting in Junos OS Release 21.2R1, on QFX Series devices, we’ve introduced link-selection statement at the edit forwarding-options dhcp-relay relay-option-82 hierarchy level, which allows DHCP relay to add suboption 5 to option 82. Suboption 5 allows DHCP proxy clients and relay agents to request an IP address for a specific subnet from a specific IP address range and scope. Earlier to this release, the DHCP relay drops packets during the renewal DHCP process as the DHCP Server uses the leaf's address as a destination to acknowledge DHCP renewal message.

The remaining statements are explained separately. Search for a statement in CLI Explorer or click a linked statement in the Syntax section for details.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 8.3.

link-selection option added in Junos OS Release 21.2R1.