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Chapter 27 Access Control
ES-2048 User’s Guide
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27.3 About SNMP
Simple Network Management Protocol (SNMP) is an application layer protocol used to
manage and monitor TCP/IP-based devices. SNMP is used to exchange management
information between the network management system (NMS) and a network element (NE). A
manager station can manage and monitor the Switch through the network via SNMP version
one (SNMPv1), SNMP version 2c or SNMP version 3. The next figure illustrates an SNMP
management operation. SNMP is only available if TCP/IP is configured.
Figure 128
SNMP Management Model
An SNMP managed network consists of two main components: agents and a manager.
An agent is a management software module that resides in a managed switch (the Switch). An
agent translates the local management information from the managed switch into a form
compatible with SNMP. The manager is the console through which network administrators
perform network management functions. It executes applications that control and monitor
managed devices.
The managed devices contain object variables/managed objects that define each piece of
information to be collected about a switch. Examples of variables include number of packets
received, node port status and so on. A Management Information Base (MIB) is a collection of
managed objects. SNMP allows a manager and agents to communicate for the purpose of
accessing these objects.
SNMP itself is a simple request/response protocol based on the manager/agent model. The
manager issues a request and the agent returns responses using the following protocol
operations:
Table 82
SNMP Commands
COMMAND
DESCRIPTION
Get
Allows the manager to retrieve an object variable from the agent.
GetNext
Allows the manager to retrieve the next object variable from a table or list within an
agent. In SNMPv1, when a manager wants to retrieve all elements of a table from an
agent, it initiates a Get operation, followed by a series of GetNext operations.
Set
Allows the manager to set values for object variables within an agent.
Trap
Used by the agent to inform the manager of some events.
Summary of Contents for ES-2048
Page 2: ...ES 2048 User s Guide 2...
Page 7: ...Safety Warnings ES 2048 User s Guide 7 This product is recyclable Dispose of it properly...
Page 8: ...Safety Warnings ES 2048 User s Guide 8...
Page 20: ...Table of Contents ES 2048 User s Guide 20...
Page 28: ...List of Tables ES 2048 User s Guide 28...
Page 30: ...30...
Page 36: ...36...
Page 40: ...Chapter 2 Hardware Installation and Connection ES 2048 User s Guide 40...
Page 46: ...Chapter 3 Hardware Overview ES 2048 User s Guide 46...
Page 56: ...Chapter 4 The Web Configurator ES 2048 User s Guide 56...
Page 66: ...Chapter 6 System Status and Port Statistics ES 2048 User s Guide 66...
Page 78: ...Chapter 7 Basic Setting ES 2048 User s Guide 78...
Page 80: ...80...
Page 95: ...Chapter 8 VLAN ES 2048 User s Guide 95 Figure 41 Port Based VLAN Setup Port Isolation...
Page 128: ...Chapter 15 Link Aggregation ES 2048 User s Guide 128...
Page 138: ...Chapter 17 Port Security ES 2048 User s Guide 138...
Page 155: ...Chapter 19 Multicast ES 2048 User s Guide 155 Figure 80 MVR Group Configuration Example...
Page 156: ...Chapter 19 Multicast ES 2048 User s Guide 156...
Page 170: ...Chapter 20 Authentication Accounting ES 2048 User s Guide 170...
Page 195: ...195 PART IV IP Application Static Route 197 Differentiated Services 201 DHCP 209...
Page 196: ...196...
Page 200: ...Chapter 23 Static Route ES 2048 User s Guide 200...
Page 208: ...Chapter 24 Differentiated Services ES 2048 User s Guide 208...
Page 216: ...216...
Page 240: ...Chapter 27 Access Control ES 2048 User s Guide 240...
Page 242: ...Chapter 28 Diagnostic ES 2048 User s Guide 242...
Page 246: ...Chapter 29 Syslog ES 2048 User s Guide 246...
Page 260: ...260...
Page 264: ...Chapter 34 Troubleshooting ES 2048 User s Guide 264...
Page 272: ...Chapter 35 Product Specifications ES 2048 User s Guide 272...
Page 274: ...274...
Page 288: ...Appendix B Common Services ES 2048 User s Guide 288...
Page 292: ...Appendix C Legal Information ES 2048 User s Guide 292...
Page 298: ...Appendix D Customer Support ES 2048 User s Guide 298...
Page 306: ...Index ES 2048 User s Guide 306...