ZyXEL G-2000 Plus v2 User Guide - Page 173
Supported MIBs, SNMP Traps
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ZyXEL G-2000 Plus v2 User's Guide 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. 13.5.1 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. 13.5.2 SNMP Traps The ZyXEL device will send traps to the SNMP manager when any one of the following events occurs: Table 58 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 A trap is sent to the manager when receiving any RFC-1215) SNMP get or set requirements with the wrong community (password). 6 whyReboot (defined in ZyXEL A trap is sent with the reason of restart before device-MIB) 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. Chapter 13 Remote Management Screens 173