Defining a custom string

You can define a custom string for the DHCP relay. The new feature of defining a custom string is similar to the existing feature of use-interface-description where you send the logical interface or physical interface description on DHCP option-82, but in this case, you have the flexibility of defining a value independent of the interface description and make use of that value as deemed. The configuration has to be done in two places, one where you define the string and one where you enable it. Definition of the string can be done in three places: 

• custom string per interface in a group - Where the value is defined only for that interface. [edit forwarding-options dhcp-r elay group v4 interface irb.100 override s] set user-defined-option-82 string 
• custom string per group - Where the value is defined per group [edit forwarding-options dhcp-r elay group v4 override s] set user-defined-option-82 string 
• custom string for global - Defined globally [edit forwarding-options dhcp-r elay override s] set user-defined-option-82 string Enable the option: 
• Enabling the custom string to go out on circuit-id option82 [edit forwarding-options dhcp-r elay group v4 relay-option-82 circuit-id] set user-defined