H3C Technologies H3C SecBlade NetStream Cards - Manual (Page 295)

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SNMP configuration
This chapter includes these sections:
• SNMP overview
• SNMP configuration task list
• Displaying and maintaining SNMP
• SNMP configuration examples
SNMP overview
The Simple Network Management Protocol (SNMP) is an Internet standard protocol widely used for a
management station to access and operate the devices on a network, regardless of their vendors,
physical characteristics and interconnect technologies.
SNMP enables network administrators to read and set the variables on managed devices to monitor their
operating and health state, diagnose network problems, and collect statistics for management purposes.
SNMP mechanism
The SNMP framework comprises the following elements:
• SNMP manager—works on a network management workstation (NMS) to monitor and manage
the SNMP-capable devices in the network.
• SNMP agent—works on a managed device to receive and handle requests from the NMS, and
send traps to the NMS when some events, such as interface state change, occur.
• Management Information Base (MIB)—Specifies the variables (such as interface status and CPU
usage) maintained by the SNMP agent for the SNMP manager to read and set.
Figure 86 Relationship between an NMS, agent and MIB
A MIB stores variables called “nodes” or “objects” in a tree hierarchy and identifies each node with a
unique OID. An OID is a string of numbers that describes the path from the root node to a leaf node. For
example, the object B in Figure 87 is uniquely identified by the OID {1.2.1.1}.