10 SNMP SNMP (Simple Network Management Protocol) is an internet­ standard protocol for managing devices on IP networks. SNMP exposes management data in the form of a hierarchy of variables in a MIB (Management Information Base). WCC Lite supports SNMP service which is not added to default build of firmware but can be installed as a module. It enables user to collect data on various parameters of system: CPU time ­ time spent for calculations of various processes: user ­- time for user processes; system -­ time for system processes; idle ­- time spent idling; interrupts -­ time spent handling interrupts. CPU load average -­ CPU load average for 1, 5 and 15 minutes respectively; Disk usage: total ­- total amount of storage in the device (in kB) available -­ amount of storage available to store data (in kB) used -­ amount of storage used in the device (in KB) blocks used percentage ­- blocks (sectors) used to store data in a disk (in kB) inodes used percentage ­- the inode (index node) is a data structure in a Unix­ style file system that describes a file­system object such as a file or a directory. Each inode stores the attributes and disk block location(s) of the object’s data. Memory usage ­- RAM usage statistics: total ­- total amount of RAM in the device (in kB); available -­ unused amount of RAM in the device (in kB); shared -­ shared amount of RAM between multiple processes (in kB); buffered - refers to an electronic buffer placed between the memory and the memory controller; cached ­- a portion of memory made of high­ speed static RAM (SRAM) instead of the slower dynamic RAM (DRAM) used for main memory; Network interfaces: MTU ­- maximum transmission unit to be sent over network; speed -­ rate of network transmission; physical address ­- unique MAC address assigned to a device; tx/rx: byte, packet, drop, error count; System properties: uptime -­ time since the device was turned on; process uptime ­- time since the process has been started; hostname ­- a label that is assigned to a device connected to a computer network; name ­- name of the device (if defined); location ­- location of the device (if defined).