Muratec F-565 Specifications download pdf (Page 80)

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SNMP(Simple Network Management Protocol)

SNMP is a protocol regulated by RFC 1157. It manages the network system activity on TCP/IP.

NGP corresponds to version 1. The latest version is version 3(deﬁned by RFC3411)

SNMP is UDP (User Datagram Protocol).

A SNMP manager software such as WebJetAdmin (HP) can retrieve or rewrite information of a SNMP agent

installed network equipment such as NGP by indicating one or more OID.

The SNMP protocol

The SNMP protocol operates at the application layer (layer 7) of the OSI model. It speciﬁed (in version 1) ﬁve

core protocol data units (PDUs):

GET REQUEST, is used to request the values of one or more MIB variables.

GETNEXT REQUEST, is used to read the values of variables in the MIB but sequentially. It is often used

to read though a table of values. After a ﬁrst read with the get-request, get-next-request are used to read

through the remaining rows.

SET REQUEST, is used to update one of the MIB values.

GET RESPONSE, is returned as an answer to a get-request, a get-next-request or set-request message.

TRAP, is used to support signiﬁcant events (e.g. a cold or a warm restart or a link that has gone down).

GetResponse

SetRequest

TRAP

Pattern 1

Pattern 2

Pattern 3

Manager Agent

GetRequest

GetNextRequest

Get information of

this object

Set information of

this object

Get information of

the next object

Send response

An event occured

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Muratec F-565 Specifications Page 80

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