Chapter 18 SNMP
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 38 SNMP Commands
COMMAND | DESCRIPTION |
Get | Allows the manager to retrieve an object variable from the agent. |
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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. |
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Set | Allows the manager to set values for object variables within an agent. |
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Trap | Used by the agent to inform the manager of some events. |
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18.1.1 Supported MIBs
MIBs let administrators collect statistics and monitor status and performance.
The switch supports the following MIBs:
•RFC 1213 SNMP MIB II
•MIB II - System
•MIB II - Interface
•RFC 1398 MIB -
•RFC 1157 SNMP v1
•RFC 1155 SMI
•RFC 2674 SNMPv2, SNMPv2c
•RFC 2819 RMON
•Group 1 (Statistics)
•Group 2 (History)
•Group 3 (Alarm)
•Gropu 4 (Event)
18.1.2SNMP v3 and Authentication
SNMP v3 adds the use of groups and users to enhance security for SNMP management. Groups are assigned access rights to SNMP objects. Users are members of groups and are therefore limited to the access rights the group has. In addition users can also be required to authenticate before conducting SNMP management sessions.
"SNMP v3 is enabled by creating SNMP groups and users. Once SNMP v3 is enabled, SNMP community should be configured for SNMP v1 and/or v2c access.
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