Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Bedienungsanleitung Seite 38

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Configuring SNMP, RMON, BootP, DHCP, and RARP Services
2-2 117362-A Rev. A
SNMP applications contain manager software that runs on a network management
station (also known as an SNMP client), such as a PC or a workstation. The
manager software implements the protocols used to exchange data with SNMP
agents. SNMP applications issue queries to gather information about the status,
configuration, and performance of external network devices, called network
elements in SNMP terminology. Network elements contain an agent and perform
the network management function that the network management stations request.
The Bay Networks Site Manager software is an example of a network
management station, and the Bay Networks Backbone Node (BN
®
) router is an
example of a network element.
The SNMP agent is a software entity that responds to information and action
request messages (SNMP Set and Get requests) sent by a network management
station (your Site Manager workstation). The messages exchanged between
manager and router SNMP agents in turn enable you to access and manage objects
in an active or inactive (stored) MIB on a particular router.
The agents also send unsolicited reports (called traps) back to the network
management station when certain network activity occurs. An example of a trap is
an overload condition as defined by the packet load’s crossing some threshold.
You use the management station to configure, monitor, and receive trap messages
from other network devices configured as SNMP agents. The management station
can get and set objects in the agents and can receive traps from the agents. The
management station, therefore, has the capability to “manage” a number of
agents.
SNMP Messages
SNMP managers and network elements communicate with each other by
sending SNMP messages (F
igure 2-1). The management station issues three types
of SNMP messages to retrieve single or multiple object variables:
GetRequest messages
GetNextRequest messages
SetRequest messages
The agent acknowledges all three types of messages in the form of a Get Response
message, which is passed to the management application. In addition, an agent
may issue a trap to the network management station to identify the occurrence of a
condition, such as a threshold that exceeds a predefined value.
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