3 Web-based Management
administrators to read and set the variables on managed devices, diagnose network
problems, plan for network capacity, and create reports.
SNMP employs a polling mechanism. It offers an essential set of features, and is especially
suitable for small, fast, and low-cost networks. SNMP is based on the connectionless
protocol UDP in the transport layer; therefore, it can easily manage devices on a network
regardless of their vendors and interconnect technologies.
SNMP consists of two components:
• NMS (Network Management System) is the software that runs on the managing device,
such as a switch.
• Agent is the software that runs on the managed device.
The NMS sends GetRequest, GetNextRequest, or SetRequest to an Agent. On receiving a
request from NMS, the Agent performs Read or Write operation to MIB (Management
Information Base), depending on the type of the request. It then creates and returns a
Response to NMS.
Agent sends a Trap to notify NMS of a critical event or change in status, such as reset.
The SNMP Agent on the switch supports SNMP v1, SNMP v2c, and SNMP v3.
SNMP v3 performs authentication based on user name and password.
SNMP v1 and SNMP v2c performs authentication based on Community Name. SNMP
packets will be discarded if the community name fails to be authenticated. SNMP’s
community is a relationship between an NMS and an agent. The community name is used
like a password to authenticate SNMP NMS’s access to the SNMP Agent on the switch.
Users can set up one or more of the following attributes of a community name:
• Define the MIB view that can be accessed by the community.
• Set the access privilege for MIB objects to be write and/or read. A read-only community
can only query MIBs for information about the switch. A read-write community is also
capable of configuring the switch.
• Configure the basic ACL for a community.
3.9.1 SNMP Community
You can specify SNMP version (v1 or v2c), community name, and access privilege (RO or
RW) on this page.
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