ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 246)

ZyWALL 10~100 Series Internet Security Gateway
16-8 Remote Management Screens
An agent is a management software module that resides in a managed device (the ZyWALL). 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.
16.6.1 Supported MIBs
The ZyWALL 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.
16.6.2 SNMP Traps
The ZyWALL will send traps to the SNMP manager when any one of the following events occurs:
Table 16-4 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).