Simple Network Management Protocol (SNMP) provides IP standard SNMP functionality in the Metasys system, which enables network administrators to manage Metasys network performance, find and resolve issues related to the Metasys network, and plan for future growth of the Metasys system. SNMP uses standard SNMP Versions 1, 2C, and 3 (which excludes SNMP encryption and authentication support). The Metasys system allows delivery of unsecured SNMP traps for Metasys alarm events by using a Network Management System (NMS).
A custom Metasys system specific MIB is available and allows the NMS to monitor Metasys point objects, display attributes, and control sequence objects. The MIB also defines explicit traps and associated attributes that align with Metasys alarm messages, making data correlation (parsing/sorting) at the NMS straightforward. Traps from the Metasys system are not encrypted.
The NMS operator can perform Gets and Get Nexts (SNMP Walks) against engines through an NMS. Gets allow you to view object data but do not allow you to write to objects. To use Gets, you must query the specific engine (SNC, for example) on which the object appears. Site Directors do not forward Get requests to other devices on the site, and you cannot perform Gets on Metasys servers. Metasys system objects are specified as a string index in a table, so the NMS must have the capability to specify an index as a string, or the NMS operator must encode the Object ID using the decimal equivalents.
The Johnson Controls® MIB is included on the product media. SNMP is offered on all supervisory devices (network engine and Metasys server).
For information on configuring SNMP traps, turning off SNMP or Gets capability, and other alarm information, refer to the Alarm and Event Management section of the Metasys SMP Help (LIT-1201793). For information about SNMP implementation in the Metasys system, see Appendix: SNMP agent protocol implementation.