Chapter 29 Access Control
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29.3 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) and/or SNMP version 2c. The next figure illustrates an SNMP management
operation. SNMP is only available if TCP/IP is configured.
Figure 97
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 such as number of
packets received, node port status etc. 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 68
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.
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Страница 36: ...Chapter 1 Getting to Know Your Switch GS 2724 User s Guide 36 ...
Страница 40: ...Chapter 2 Hardware Installation and Connection GS 2724 User s Guide 40 ...
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Страница 94: ...Chapter 8 VLAN GS 2724 User s Guide 94 Figure 36 Port Based VLAN Setup All connected ...
Страница 126: ...Chapter 16 Port Authentication GS 2724 User s Guide 126 ...
Страница 130: ...Chapter 17 Port Security GS 2724 User s Guide 130 ...
Страница 136: ...Chapter 18 Classifier GS 2724 User s Guide 136 Figure 58 Classifier Example ...
Страница 139: ...Chapter 19 Policy Rule GS 2724 User s Guide 139 Figure 59 Policy ...
Страница 145: ...Chapter 20 Queuing Method GS 2724 User s Guide 145 ...
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Страница 152: ...Chapter 21 VLAN Stacking GS 2724 User s Guide 152 ...
Страница 165: ...165 PART IV IP Application Static Route 167 RIP 169 IGMP 171 Differentiated Services 173 DHCP 177 ...
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Страница 183: ...Chapter 27 DHCP GS 2724 User s Guide 183 Figure 89 DHCP Relay Configuration Example ...
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Страница 262: ...Chapter 38 Introducing Commands GS 2724 User s Guide 262 ...
Страница 296: ...Chapter 42 IEEE 802 1Q Tagged VLAN Commands GS 2724 User s Guide 296 ...
Страница 300: ...Chapter 44 Routing Domain Command Examples GS 2724 User s Guide 300 ...
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Страница 312: ...Appendix B Changing a Fuse GS 2724 User s Guide 312 ...
Страница 332: ...Appendix E Common Services GS 2724 User s Guide 332 ...
Страница 336: ...Appendix F Legal Information GS 2724 User s Guide 336 ...
Страница 348: ...Index GS 2724 User s Guide 348 ...