Snmp; Theory - Planet Networking & Communication WGSW-2840 User Manual

NOTE:
1. The Switch's factory-default IP address is 192.168.0.100 with Submask 255.255.255.0 and a default
gateway of 192.168.0.254
2. The changed IP address take effect immediately after click on the OK button, you need to use the new
IP address to access the Web interface.
3. The changed IP address remains the original after reboot the switch unless the configuration is saved.
To save the changed IP address, please move to System/Saving Parameters menu.

4.4.2 SNMP

4.4.2.1 Theory

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：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
。