HP T9576G06 Management Manual page 53

The NonStop SNMP Environment Architectural Overview of NonStop SNMP
The SNMP agent uses Interprocess Communication (IPC) messages to
communicate with independent subagents about the resources they manage.
Subagents can reside on the same node as the SNMP agent or on different nodes.
Each SNMP agent can support one instance of any particular subagent.
The SNMP control file (SNMPCTL) contains configuration parameters for the
SNMP agent.
When the primary SNMP agent process is active, it writes trace records to the file
ZZSMPTRP. When the backup process becomes active, it writes to the file
ZZSMPTRB.
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