
SNMP Introduction
©2008 Allied Telesis Inc. All rights reserved.
54.10
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
Software Version 5.2.1
Message Format for SNMPv1 and SNMPv2c
Fields in an SNMP
message:
SNMP PDUs:
Generic SNMP
traps
Field
Function
Version
The version of the SNMP protocol. The value is version-1 (0) for
the SNMP protocol as defined in RFC 1157, or version-2c (1) for
the SNMP protocol as defined in RFC 1902.
Community
The name of an SNMP community, for authentication purposes
SNMP PDU
An SNMP Protocol Data Unit (PDU).
PDU
Function
get-request
Sent by an NMS to an agent, to retrieve the value of an object.
get-next-request
Sent by an NMS to an agent, to retrieve the value of the next object
in the sub-tree. A sub-tree is traversed by issuing a get-request PDU
followed by successive get-next-request PDUs.
get-bulk-request
Sent by an NMS to an agent to request a large amount of data with
a single message. This is for SNMPv2c messages.
set-request
Sent by an NMS to an agent, to manipulate the value of an object.
SNMP PDU Version Community
get-response
Sent by an agent to an NMS in response to a get-request, get-next-
request, get-bulk-response, or set-request PDU.
trap
Sent by an agent to an NMS to notify the NMS of a extraordinary
event.
report
Although not explicitly defined in the RFCs, reports are used for
specific purposes such as EngineID discovery and time
synchronization.
Value
Meaning
coldStart
The agent is re-initializing itself. Objects may be altered.
warmStart
The agent is re-initialising itself. Objects are not altered.
linkDown
An interface has changed state from up to down.
inkUp
An interface has changed state from down to up.
authentication
Failure An SNMP message has been received with an invalid
community name.
egpNeighborLoss
An EGP peer has transitioned to down state.
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