Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario descargar pdf (Pagina 32)

Configuring SNMP, BootP, DHCP, and RARP Services

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117362-C Rev 00

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 enable you to access and manage objects in an

active or inactive (stored) management information base (MIB) on a 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 (Figure 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 by passing a Get Response

message to the management application. In addition, an agent may issue a trap to

the network management station to identify a condition, such as a threshold that

exceeds a predefined value.

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario Pagina 32