This option determines the content of the Agent Remote ID (sub-option 2).
ip(1) inserts the ip address of the relay's mgmt-interface
and encodes it with sub option type A1.
mac(2) inserts the mac adress of the relay's mgmt-interface
and encodes it with sub option type 00.
client-id(3) inserts the client identifier (sysName) of the relay's mgmt-interface
and encodes it with sub option type A2.
other(4) inserts the value in hmRelayOptionRemoteIDValue
and encodes it with sub option type A3.