SNMP Configuration and Management Manual

The NonStop SNMP Environment
SNMP Configuration and Management Manual—424777-006
1-5
SNMP Manager
SNMP Manager
An application that automates the management of network elements (managed
resources) under the control of one or more SNMP agents. HP provides an SNMP
agent on its NonStop systems, and other vendors provide SNMP agents on their
devices. An agent communicates with a manager using the message and information
protocol defined in public SNMP documents known as RFCs.
The SNMP manager sends requests to and receives responses from agent processes.
Communication between managers and the SNMP agent occurs through the NonStop
TCP/IP subsystem, the Parallel Library TCP/IP subsystem or the NonStop TCP/IPv6
subsystem. The NonStop TCP/IP, Parallel Library TCP/IP, and Nonstop TCP/IPv6
subsystems support both local area networks (LANs) and wide area networks (WANs)
or, through calls to NonStop Kernel interprocess communication (IPC) procedures,
either locally or over Expand, when the manager resides on NonStop Kernel systems.
PDU
Organization of messages exchanged between managers and agents. Protocol data
units (PDUs), defined in RFCs, conduct specific operations, such as retrieving a value,
changing a value, or sending unsolicited notifications, known as traps, to an SNMP
manager. Message Protocol on page 1-6 provides more detail about the various kinds
of PDUs.
MIB
Information exchanged between managers and agents. An MIB describes a collection
of objects that can be managed. An example of an MIB object is the physical location
of a node. MIBs are described in a language known as Abstract Syntax Notation One
(ASN.1). Some MIBs are Internet MIBs defined in RFCs. Other MIBs are vendor
defined.
SNMP agents access and modify values for MIB objects on behalf of SNMP managers.
An SNMP manager can interpret MIB values when the SNMP manager has access to
a compiled version of the ASN.1 MIB definition. For more about MIBs, see Information
Protocol on page 1-9.
SNMP Agent
A process that intercepts PDUs from an SNMP manager and responds to them with
PDUs. The agent accesses information described in MIBs, either directly or through
SNMP subagents. The SNMP agent acts as a server for any SNMP network
management requester, providing information about HP resources. The SNMP agent
supports two MIB-II groups (System and SNMP) defined by RFC 1213, Management
Information Base for Network Management of TCP/IP-Based Internets: MIB-II, and a
private group (zagInternal) that is defined by HP. For more information about how the
Note. H-series RVUs do not suport Parallel Library TCP/IP