Option 18 and Option 37 Fields Supported by DHCPv6 Snooping
Functions of the Option 18 and Option 37 fields are similar to that of the Option 82 field. A device inserts the Option 18 and Option 37 fields into a DHCPv6 message to record the DHCPv6 client location.
A device supports the Option 18 and Option 37 fields only after DHCPv6 snooping is enabled. For details, see Inserting the Option 18 or Option 37 Field in a DHCPv6 Message.