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User’s Manual of LRP-822CS/LRP-1622CS
67
4.2.7 SNMP Management
4.2.7.1 SNMP Overview
The
Simple Network Management Protocol (SNMP)
is an application layer protocol that facilitates the exchange of
management information between network devices. It is part of the
Transmission Control Protocol/Internet Protocol
(TCP/IP)
protocol suite. SNMP enabl ance, find and solve network
roblems, and plan for network growth.
An SNMP-managed network consists of four components: Network management stations (NMSs), SNMP agent, management
informati (MIB) and network-ma tocol:
anagement stations
consoles, these devices execute management applications
ntrol network Ss are usually engineering workstation-caliber computers with
pixel color displ bundant disk space. At least one NMS must be present in
nment.
tware m rk elements. They collect and store management information
such as the number of error packets received by a network element.
Management information base (MIB)
：
A MIB is a collection of managed objects residing in a virtual information store.
Collections of related managed objects are defined in specific MIB modules.
。
Networ
：
A management protocol is used to convey management information between agents
and NMSs. SNMP is the Internet community's de facto standard management protocol.
NMP Operations
SNMP itself is a simple request/response protocol. NMSs can send multiple requests without receiving a response.
。
Get --
Allows the NMS to retrieve an object instance from the agent.
。
Set --
Allows the NMS to set values for object instances within an agent.
。
Trap --
Used by the agent to asynchronously inform the NMS of some event. The SNMPv2 trap message is designed to
replace the SNMPv1 trap message.
SNMP Community
An SNMP community is the group that devices and management stations running SNMP belong to. It helps define where
information is sent. The community name is used to identify the group. An SNMP device or agent may belong to more than one
SNMP community. It will not respond to requests from management stations that do not belong to one of its communities.
SNMP default communities are:
。
Write
= private
。
Read
= public
es network administrators to manage network perform
p
on base nagement pro
。
Network m (NMSs):
Sometimes called
that monitor and co elements. Physically, NM
fast CPUs, mega ays, substantial memory, and a
each managed enviro
。
Agents
：
Agents are sof odules that reside in netwo
。
k-management protocol
S