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AP User Manual January 2004
Software Release 4.1
4.7.1 Agent
In SNMP, software on each managed device acts as the agent. The agent collects and stores
management information in ASN.1 format, in a structure that a MIB (management information
base) defines. The agent responds to commands to
• send information about the managed device.
• modify specific data on the managed device.
4.7.2 Managed Device
In SNMP, the managed device is the network element that operates on the agent software. In the
Canopy network, this managed device is the module (AP, SM, or BH). With the agent software, the
managed device has the role of server in the context of network management.
4.7.3 NMS
In SNMP, the NMS (network management station) has the role of client. An application (manager
software) operates on the NMS to manage and monitor the modules in the network through
interface with the agents.
4.7.4 Dual Roles
The NMS can simultaneously act as an agent. In such an implementation, the NMS acts as
• client to the agents in the modules, when polling for the agents for information and
sending modification data to the agents.
• server to another NMS. when being polled for information gathered from the agents
and receiving modification data to send to the agents.
4.7.5 SNMP Commands
To manage a module, SNMPv2 supports the set command, which instructs the agent to change
the data that manages the module.
To monitor a network element (Canopy module), SNMPv2 supports
• the get command, which instructs the agent to send information about the module to
the manager in the NMS.
• traversal operations, which the manager uses to identify supported objects and to
format information about those objects into relational tables.
In a typical Canopy network, the manager issues these commands to the agents of more than one
module (to all SMs in the operator network, for example).
4.7.6 Traps
When a specified event occurs in the module, the agent initiates a trap, for which the agent sends
an unsolicited asynchronous message to the manager.
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