Interlogix NS3502-8P-2S User Manual - Manual (Page 82)

IFS NS3502-8P-2S User Manual
82
4.3 Simple Network Management Protocol
4.3.1 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 enables network administrators to manage
network performance, find and solve network problems, and plan for network growth.
An SNMP-managed network consists of three key components: Network management stations (NMSs),
SNMP agents, Management information base (MIB) and network-management protocol：
。
Network management stations (NMSs)：Sometimes called consoles, these devices execute
management applications that monitor and control network elements. Physically, NMSs are
usually engineering workstation-caliber computers with fast CPUs, megapixel color displays,
substantial memory, and abundant disk space. At least one NMS must be present in each
managed environment.
。
Agents: Are software modules that reside in network 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.
。 network-management protocol：A management protocol is used to convey management
information between agents and NMSs. SNMP is the Internet community's de facto standard
management protocol.
SNMP 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. A 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