Documents by R. Johnson
2005, RFC3993: Subscriber-ID Suboption for the Dynamic Host Configuration Protocol (DHCP) Relay Agent Option
2005, RFC4243: Vendor-Specific Information Suboption for the Dynamic Host Configuration Protocol (DHCP) Relay Agent Option
2008, RFC5107: DHCP Server Identifier Override Suboption
2010, RFC5859: TFTP Server Address Option for DHCPv4
2012, RFC6607: Virtual Subnet Selection Options for DHCPv4 and DHCPv6