ZyXEL Communications P-324 User's Guide download pdf (Page 295)

P-2602HWNLI User’s Guide

Chapter 21 Remote Management Configuration 295

An agent is a management software module that resides in a managed device (the ZyXEL

Device). An agent translates the local management information from the managed device into

a form compatible with SNMP. The manager is the console through which network

administrators perform network management functions. It executes applications that control

and monitor managed devices.

The managed devices contain object variables/managed objects that define each piece of

information to be collected about a device. Examples of variables include such as number of

packets received, node port status etc. A Management Information Base (MIB) is a collection

of managed objects. SNMP allows a manager and agents to communicate for the purpose of

accessing these objects.

SNMP itself is a simple request/response protocol based on the manager/agent model. The

manager issues a request and the agent returns responses using the following protocol

operations:

• Get - Allows the manager to retrieve an object variable from the agent.

• GetNext - Allows the manager to retrieve the next object variable from a table or list

within an agent. In SNMPv1, when a manager wants to retrieve all elements of a table

from an agent, it initiates a Get operation, followed by a series of GetNext operations.

• Set - Allows the manager to set values for object variables within an agent.

• Trap - Used by the agent to inform the manager of some events.

21.6.1 Supported MIBs

The ZyXEL Device supports MIB II that is defined in RFC-1213 and RFC-1215. The focus of

the MIBs is to let administrators collect statistical data and monitor status and performance.

21.6.2 SNMP Traps

The ZyXEL Device will send traps to the SNMP manager when any one of the following

events occurs:

Table 115 SNMP Traps

TRAP #

TRAP NAME DESCRIPTION

0 coldStart (defined in RFC-1215) A trap is sent after booting (power on).

1 warmStart (defined in RFC-1215) A trap is sent after booting (software reboot).

4 authenticationFailure (defined in

RFC-1215)

A trap is sent to the manager when receiving any

SNMP get or set requirements with the wrong

community (password).

6 whyReboot (defined in ZYXEL-

MIB)

A trap is sent with the reason of restart before

rebooting when the system is going to restart (warm

start).

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ZyXEL Communications P-324 User's Guide Page 295