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HUAWEI TECHNOLOGIES CO., LTD.
Simple Network
Management Protocol
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Foreword
Management framework solutions for TCP/IP networks were introduced
as hardware and software increased, in order to support rapid network
growth. SNMP was originally adapted from a more simpler SGMP
protocol for use as the basis for common network management
throughout the system. SNMP has since experienced version revisions,
however remains the standard protocol for network management. The
SNMP framework, as well as the supporting Management Information
Base act as the foundation for network management, and are introduced
in support of a well rounded understanding of the network management
framework for TCP/IP.
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Objectives
Upon completion of this section, trainees will be able to:
Describe the SNMP architecture and messaging behavior.
Describe the function of the Management Information Base (MIB).
Configure general SNMP parameters and traps.
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SNMP Application
Page 4
NM Station
SNMP
SNMP is used to communicate management information
between network management stations and network elements.
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SNMP Architecture
Page 5
Agent MIBObject
SNMP
Execute
Notify
Network Element
NMS
Agents exist within network elements through which NMS
interact to retrieve or alter parameter variables in the MIB
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MIB Objects
Page 6
internet(1)
directory(1) mgmt(2) experimental(3) private(4)
system(1) interface(2) at(3) ip(4) icmp(5)
mib-2(1)
……
……
…… …… …… …… ……
root
Ccitt(1) ISO(1) Joint-iso-ccitt(1)
Standard(0) registration authority(1) Member body(2) Identified organization(3)
dod(6)
enterprise(1)
The MIB acts as a virtual store for the management of objects.
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SNMP Operation
Page 7
NMS
UDP 162
UDP 161
UDP 161
UDP 161
get-request
get-response
get-next request
get-response
set-request
get-response
trap
SNMP Management Process SNMP Agent Process
Requests are received by an SNMP agent on UDP port 161.
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SNMPv2c
Page 8
system(1) interface(2) at(3) ip(4) icmp(5)
mib-2(1)
sysUpTime OBJECT-TYPESYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION "The time (in 1/100th of a
second) since the network management
portion of the system was last re-
initialized.“
::= { system 3 }
ifSpeed OBJECT-TYPESYNTAX Gauge
ACCESS read-only
STATUS mandatory
DESCRIPTION "An estimate of
the interface's current bandwidth
in bits per second."
::= { ifEntry 5 }
ifOutOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION "The total
number of octets
transmitted out of the
interface, including framing
characters."
::= { ifEntry 16 }
New Get-bulk request PDU and inform request included.
64 bit counters introduced to prevent counter wrap.
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Get
Get Response
SNMPv3 security mechanisms support data integrity, data
origin authentication, confidentiality and timely message delivery
SNMPv3
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SNMP Configuration
Page 10
NMS RTA
G0/0/1
20.1.1.1/2410.1.1.1/24
[RTA]snmp-agent
[RTA]snmp-agent sys-info version v2c
[RTA]snmp-agent trap enable
[RTA]snmp-agent trap source G0/0/1
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Configuration Validation
Page 11
[RTA]display snmp-agent sys-info
The contact person for this managed node:
R&D Shenzhen, Huawei Technologies Co., Ltd.
The physical location of this node:
Shenzhen China
SNMP version running in the system:
SNMPv2c
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Summary
Which version(s) of SNMP is/are enabled by default?
What is the destination port number that is used by an agent to
forward traps to a Network Management Station?
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