4.7.3.7
SNMP OVERVIEW
SNMP (Simple Network Management Protocol) is used by network management systems to manage and monitor
network-attached devices. SNMP is based on the manager/agent model consisting of a manager, an agent, a data-
base of management information, managed objects, and the network protocol. The manager provides the inter-
face between the human network manager and the management system. The agent provides the interface be-
tween the manager and the physical devices being managed (Figure 28). SNMP uses basic messages (
such as GET,
GET-NEXT, SET, and TRAP
) to communicate between the manager and the agent.
Figure 28 - SNMP: manager/agent model
MIB
The manager and agent use a Management Information Base (MIB), a logical, hierarchically organized database of
network management information. MIB comprises a complete collection of objects used to manage entities in a
network. A long numeric tag or object identifier (OID) is used to distinguish each variable uniquely in the MIB and
SNMP messages.
GEMINIG3 MIB FILE
Each GeminiG3 unit firmware package is bundled with three MIB files (found inside mibs.zip file):
•
dataradio-regs.mib
: contains a top level set of managed object definitions aimed at managing CalAmp prod-
ucts.
•
1213.mib
: contains a set of managed object definitions aimed at managing TCP/IP-based internets.
•
gcu3.mib
: contains a set of managed object definitions aimed at managing CalAmp mobile units.
OID
In SNMP, each object has a unique OID consisting of numbers separated by decimal points. These object identifiers
naturally form a tree. Figure 29 illustrates this tree-like structure for
1213.mib,
which comes bundled with every
ParagonP4 unit package
.
A path to any object can be easily traced starting from the root (top of the tree). For ex-
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