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Chapter 16 The Remote Management Screens
User’s Guide
188
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.
The WiMAX Modem 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.
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.
16.5.1 SNMP Traps
The WiMAX Modem sends traps to the SNMP manager when any of the following
events occurs:
Table 67 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).
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.