Cisco 15216 EDFA2 Specifications Page 70

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5-4
Cisco ONS 15216 EDFA2/EDFA2-A Operations Guide, R2.4
July 2004
Chapter 5 SNMP MIB Configuration
5.1.3 SNMP MIBs and Message Types
5.1.2.3 SNMP Manager
The ONS 15216 EDFA2 comes with a pre-installed SNMP manager accessible via the CLI. This SNMP
manager can be accessed and used to communicate with the SNMP agent that is also pre-installed on
each ONS 15216 EDFA2. This manual displays examples of issuing SNMP commands to the amplifier
using the built-in SNMP manager.
SNMP managers from third-party vendors running on a separate computer located at a network
management center are often used to manage network elements. If a third-party SNMP manager is used,
it must be able to communicate with the SNMP agent pre-installed on the ONS 15216 EDFA2.
If a third-party SNMP manager is used, it is assumed that the SNMP manager is pre-installed prior to
the SNMP MIB installation. Each vendor-specific SNMP manager has an unique set of instructions for
SNMP MIB installation. For directions on loading the SNMP MIBs, refer to SNMP manager
documentation.
Cisco does not provide or recommend a standard third-party SNMP manager.
5.1.3 SNMP MIBs and Message Types
SNMP operations can be quite powerful. A manager can retrieve or modify the value of management
information accessible by an agent, an agent can report an event to a manager, and the manager can
inform another manager of the value of management information on an agent. Using retrieval and
modification operations, a manager can cause an agent to perform an action or execute a command. The
manager can also create new and delete existing instances of management information.
A MIB is a hierarchically-organized collection of information. Network management protocols, such as
SNMP, gain access to these MIBs. MIBs consist of managed objects and are identified by object
identifiers (OID).
The ONS 15216 EDFA2 SNMP agent communicates with an SNMP management application (a
third-party application or the built-in SNMP manager) using SNMP messages. Table 5-3 describes
SNMP operation types.
Table 5-3 SNMP Operation Types
Operation Description
get-request Retrieves a value from a specific variable.
get-next-request Retrieves the value following the named variable; this operation is often used
to retrieve variables in a table. With this operation, an SNMP agent does not
need to know the exact variable name. The SNMP manager searches
sequentially to find the needed variable in the MIB.
get-response The reply to a get-request, get-next-request, get-bulk-request, or set-request
sent by an NMS.
get-bulk-request Similar to a get-next-request, but this operation fills the get-response with up
to the max-repetition number of get-next interactions.
trap An unsolicited message sent by an SNMP agent to an SNMP manager
indicating that an event has occurred.
set-request Sets a value of a specific variable.
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