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Unleashing the potential of the Internet of Things 7

8.5 Consideration of the sensor network gateway for supporting IP-based sensor
networks
In case an IP-based sensor network is deployed (e.g. 6LoWPAN), the sensor network gateway
(6LowPAN gateway) can be expected to inspect the data packets traversing the sensor network
gateway. If the destination IP address of an IP header of an SNMP message is the IP address of the
sensor node that resides under the sensor network gateway, the conversion of an SNMP message
described in clause 8.3 is not needed. However, the sensor network gateway can perform TCP/UDP
header compression and SNMP optimizations.
When the sensor network gateway receives an SNMP message that is bound for the sensor network
manager, the sensor network gateway may perform TCP/UDP header de-compression and SNMP
message re-storing if TCP/UDP header compression and SNMP optimizations are performed on the
received SNMP message.

9 Object identifier allocation for MIB and object identifier translation between SNMP
and sensor network management protocols

In SNMP, managed objects are identified by OIDs [b-ITU-T X.660] that are relatively long byte
strings to be transferred on a sensor network. Considering the low data rate of sensor networks,
relative OIDs are used in sensor network management protocols so as to identify managed objects
relative to the base OID {itu-t(0) recommendation(0) h(8) h641(641) sensor-network-
mgt(2) n} (see Annex A).
When a sensor network gateway translates an SNMP message into a sensor network management
protocol message, the sensor network gateway can remove the base OID from the OID for MIB in
VarBind. When a sensor network gateway translates a sensor network management protocol
message into an SNMP message, the sensor network gateway inserts the base OID in front of the
OID of the MIB in VarBind (see Appendix I).

Rec. ITU-T Y.4701/H.641 (02/2012) 953