The following two variables are provided as a way of reporting SNMP
errors to the management station. The SNMP agent keeps track two
variables for each set request (last oid and last error message that
was caused by setting the value for last oid). This information is
based on the incoming ipaddress and port, so there is only one instance
available for each source. The management station will only see errors
that is the result of its own set request. If there is no errors
available for this source, no value is returned.