SNMP parameters are configured in the Protocol settings section of the device parameters:
•IP Address – IP address or DNS name of a SNMP device interrogated
•Protocol version – SNMP version of the device (both SNMP v.1 and SNMP v.2 are supported)
•Maximum number of requests in one packet – number of values requested in one SNMP request. For some devices, the default value of that setting must be decreased.
•Maximum number of table requests in a packet — the number of values of table elements (setting the tag Table elements) requested in one SNMP request.
•Union – setting a SNMP Community for reading (as a rule, public)
•Union for writing – setting a SNMP Community for writing (as a rule, private)
•Response timeout (ms) – maximal time to wait for a device reply; the default value is 1000
•Attempts to reconnect on error – number of repeated attempts to connect with the device after a connection error; the default value is 3
•Response timeout (ms) – waiting time for a response from the device.
•Attempts to reconnect on error – number of repeated attempts to connect with the device after a connection error. Then the tags are set to the BAD quality attribute.
The remaining settings are only available when the protocol version is selected - v3. The settings must match the settings in the SNMP device settings.
•Security name – user name for connecting to the device.
•Security level – security level of the device. There are three options:
oNoAuthNoPriv - No authentication and no encryption. Only the user name is used.
oauthNoPriv - with authentication and no encryption. For authentication, need a password, but the data exchange is not encrypted.
oauthPriv - with authentication and with encryption.
•Authentication protocol – algorithm for hashing an authentication password. Options - MD5 or SHA.
•Password Authentication – password authentication.
•Privacy protocol – data encryption algorithm. Options - DES or AES128
•Privacy password – data encryption password.
•Context name – collection of management information accessible by an SNMP entity.
Other settings are standard ones (see The Dialog of Device Parameters ).
When add an SNMP device also is added a Control group with 2 tags:
•Available – this tag can be used to control the polling of the device - by giving the signal "False", the poll will be stopped. If the device is turned on, the tag returns "True".
•UnscheduledRequest – when an "TRUE" value is sent to the tag, an interrogation of the device tags is performed.
Can not to add other tags to this group.