Chapter 4: Web configuration
82 NS3552-8P-2S-V2 User Manual
• 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): An 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. 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)
Use the SNMP Menu to display or configure the industrial managed switch's SNMP
function. This section has the following items:
System Configuration Configure SNMP on this page.
System Information The system information is provided here.
SNMPv3 Communities Configure SNMPv3 communities table on this page.
SNMPv3 Users Configure SNMPv3 users table on this page.
SNMPv3 Groups Configure SNMPv3 groups table on this page.
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