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 an MIB (Management Information Base).

WCC Lite supports SNMP service which is not added to the default build of firmware but can be installed as a module. It enables users to collect data on various parameters of the 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).