vRtrIfDHCP6ItfIdString 1.3.6.1.4.1.6527.3.1.2.3.36.1.22

The value of the object vRtrIfDHCP6ItfIdString specifies the string that will be put in the interface-id option added by the relay agent. This value is only meaningful if the object vRtrIfDHCP6RelayItfIdOption is set to string(4).