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Chapter 16
Configuring SNMP
You must configure the SNMP agent to use the version of SNMP supported by the management station.
An agent can communicate with multiple managers; therefore, you can configure the software to support
communications with one management station using the SNMPv1 protocol and another using the
SNMPv2 protocol.
SNMP Manager Functions
The SNMP manager uses information in the MIB to perform the operations described in
Table 16-1 SNMP Operations
Operation
get-request
get-next-request
get-bulk-request
get-response
set-request
trap
1. With this operation, an SNMP manager does not need to know the exact variable name. A sequential search is performed to
2. The get-bulk command works only with SNMPv2.
SNMP Agent Functions
The SNMP agent responds to SNMP manager requests as follows:
•
•
The SNMP agent also sends unsolicited trap messages to notify an NMS that a significant event has
occurred on the agent. Examples of trap conditions include, but are not limited to, when a port or module
goes up or down, when spanning-tree topology changes occur, and when authentication failures occur.
SNMP Community Strings
SNMP community strings authenticate access to MIB objects and function as embedded passwords. In
order for the NMS to access the bridge, the community string definitions on the NMS must match at least
one of the three community string definitions on the bridge.
A community string can have one of these attributes:
•
OL-4059-01
Description
Retrieves a value from a specific variable.
Retrieves a value from a variable within a table.
2
Retrieves large blocks of data that would otherwise require the transmission of
many small blocks of data, such as multiple rows in a table.
Replies to a get-request, get-next-request, and set-request sent by an NMS.
Stores a value in a specific variable.
An unsolicited message sent by an SNMP agent to an SNMP manager when some
event has occurred.
find the needed variable from within a table.
Get a MIB variable—The SNMP agent begins this function in response to a request from the NMS.
The agent retrieves the value of the requested MIB variable and responds to the NMS with that value.
Set a MIB variable—The SNMP agent begins this function in response to a message from the NMS.
The SNMP agent changes the value of the MIB variable to the value requested by the NMS.
Read-only—Gives read access to authorized management stations to all objects in the MIB except
the community strings, but does not allow write access
Cisco Aironet 1400 Series Wireless Bridges Software Configuration Guide
Understanding SNMP
Table
16-1.
1
16-3
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