Currently, SNMP is used to manage multiple network devices in bulk.It is the "NETCONF" mechanism that has recently been RFC to replace this SNMP and existing CLI management and achieve efficient management by web applications.Here, we will introduce the background of the appearance of Netconf and the rough mechanism.
CLI and SNMP -based settings and management
Except for low -layer products such as repeater hubs and switching hubs for individuals, most network equipment requires initial settings.In addition, after starting operation, it will be necessary to change settings, monitoring operating status, and troubles.
It is common to connect the PC for such devices with a serial cable or Telnet, etc., and perform the command line interface (CLI).Recently, the GUI of setting and management tools is progressing, but the demand for CLI seems to decrease much less.
There are also GUI tools, but Cisco's routers and switches are often operated from the CLI.
If it is a network device alone, the CLI and GUI setting management tools are sufficient, but when multiple units are reached, the centralized management mechanism becomes important.SNMP (Simple Network Management Protocol) is a method of efficiently setting and managing devices on such large networks.
The SNMP consists of a database called MIB (Management Information Base), which registers the managed SNMP manager, the SNMP manager on the management side, and the mib (Management Information Base) that registers the management information according to the type of equipment.
The SNMP agent is mounted on a network device, and its information is released as MIB.SNMP managers are usually implemented as GUI software for PC.The basic operation of SNMP is that the SNMP manager specifies the item to be obtained in the MIB, sends it into the SNMP agent as a setting, or obtains a corresponding value such as packet flow.
However, using the SNMP trap function, the SNMP agent can actively send data to the SNMP manager.Usually, it is common to send as a warning when a port is cut off.
In SNMP, it is basically to get information from agents, and only traps are actively pushed information.
SNMP has three versions of SNMPV1/V2/V3.SNMPv1 is the most widely used, but SNMPv2 has been introduced due to security problems.However, SNMPv2 had a complicated security system and had difficulty performance, so it branched into standards such as V2C and V2U.Therefore, SNMPv3 was re -created by reinforcing security based on SNMPv1.Currently, many management tools and switches are moving to SNMPv3.
What are existing network management issues?
