What is snmp protocol? How is snmp work with NMS and EMS?
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Answer Posted / anita
SNMP is based on the manager/agent model consisting of an
SNMP manager, an SNMP agent, a database of management
information, managed SNMP devices and the network protocol.
The SNMP manager provides the interface between the human
network manager and the management system. The SNMP agent
provides the interface between the manager and the physical
device(s) being managed.
The SNMP manager and agent use an SNMP Management
Information Base (MIB) and a relatively small set of
commands to exchange information. The SNMP MIB is organized
in a tree structure with individual variables, such as
point status or description, being represented as leaves on
the branches. A long numeric tag or object identifier (OID)
is used to distinguish each variable uniquely in the MIB
and in SNMP messages.
SNMP uses five basic messages (GET, GET-NEXT, GET-RESPONSE,
SET, and TRAP) to communicate between the SNMP manager and
the SNMP agent. The GET and GET-NEXT messages allow the
manager to request information for a specific variable.
The agent, upon receiving a GET or GET-NEXT message, will
issue a GET-RESPONSE message to the SNMP manager with
either the information requested or an error indication as
to why the request cannot be processed. A SET message
allows the SNMP manager to request a change be made to the
value of a specific variable in the case of an alarm remote
that will operate a relay. The SNMP agent will then respond
with a GET-RESPONSE message indicating the change has been
made or an error indication as to why the change cannot be
made. The SNMP TRAP message allows the agent to
spontaneously inform the SNMP manager of an "important"
event.
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