3.4.2.3 SNMP
The SNMP (Simple Network Management Protocol) is used to monitor the status and to manage
network devices. Unlike other management protocols such as Telnet, SSH and HTTP, the SNMP
protocol not only allows an operator to manage the unit, but also informs him about the changes
in the device status when management session was inactive.
The SNMP protocol has a client-server background. The modems act as SNMP-Agents, they
communicate with the SNMP-Server that is actually a software and available free or commercially
from various vendors for different platforms. The FlexView Network Management System (NMS)
from FlexDSL Telecommunications AG is available too.
Figure 3.25 The structure of SNMP-based NMS.
The NMS Server authenticates local and remote Management Consoles, interact with other NMS
Servers, sends and receives SNMP messages and stores various databases including the MIB
database. The Management Information Base (MIB) is a plain text file that has to be imported into
the SNMP Server for the purpose of translation the Object Identification (OID) numbers and their
content to the human readable format. For example, it is requested to check the status of LAN
port. The network administrator can check the SNMP variable with the OID 1.3.6.1.2.2.1.2.2.1.8
path, or, if using MIB file, the same variable can be reachable at the RFC1213-MIB|ifOperStatus
address. Its content can be "2" in the first example, or "down" if MIB file is used.
The following MIB files are supported:
• MIB II RFC1213-MIB, a standard MIB for all devices is fully supported
• IF-MIB, RFC-2863, MIB descriptions of interfaces is fully supported
• NATEKS-MIB, MIB for the Nateks/FlexDSL equipment is fully supported
• DS1-MIB, RFC-2495, MIB describing E1 streams is partially supported
• RMON-MIB, RFC-2819 remote monitoring for statistics is fully supported
• RS-232-MIB, RFC-1659 for serial interfaces is partially supported
• BRIDGE-MIB, RFC-4188, a standard MIB for Ethernet Bridges is fully supported
• Q-BRIDGE-MIB, RFC-4363, an extended MIB for Ethernet Bridges is partially supported
• RSTP-MIB, RFC-4318, an extended MIB for RSTP protocol is fully supported
• RFC-4133 Entity-MIB partially supported
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