ZyXEL Communications P-2304R-P1 Series Manuel D’Utilisation

 Chapter 16 Remote MGMT

P-2304R-P1 Series User’s Guide

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.

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.

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

There is a default system management idle timeout of five minutes (three hundred seconds). 
The ZyXEL Device automatically logs you out if the management session remains idle for 
longer than this timeout period. The management session does not time out when a statistics 
screen is polling. You can change the timeout period in the SYSTEM General screen.

Table 74   SNMP Traps

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).

6a

For intentional reboot :

A trap is sent with the message "System reboot by user!" 

if reboot is done intentionally, (for example, download 

new files, CI command "sys reboot", etc.).

6b

For fatal error : 

A trap is sent with the message of the fatal code if the 

system reboots because of fatal errors.