Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) - Managed Switches User Guide - Manual (Page 41)

40 CHAPTER 4 • WEB-BASED MANAGEMENT (WBM)
Simple Network Management Protocol (SNMP)
SNMP is a manufacturer-independent standard for Ethernet management and defines com-
mands for reading and writing error and status message information and formats. SNMP
is also a structured model, which comprises agents and their relevant MIB (Management
Information Base) and a manager. The manager is a software tool, which is executed on a
network management station.
The agents are located inside switches, bus terminals, routers and other devices that sup-
port SNMP. The task of the agents is to collect and provide data in the MIB. The manager
regularly requests and displays this information. The devices can be configured by writing
data from the manager to the MIB. In the event of an emergency, the agents can also send
messages (traps) directly to the manager.
Note
All configuration modifications, which are to take effect after a switch restart, must
be saved permanently using the “flWorkFWCtrlConfSave” object.
SNMP Interface
The Click 340/341/342 have an SNMP agent. This agent manages Management Information
Base II (MIB 2) according to RFC1213 MIB, bridge MIB, RSTP MIB, RFC1907 MIB, and
private SNMP objects.
Network management stations can read and modify configuration and diagnostic data
from network devices via the Simple Network Management Protocol (SNMP). In addition,
any SNMP tools or network management tools can be used to access the MIB’s via SNMP.
The MIBs supported by the relevant device must be made available to the SNMP manage-
ment tools.
On the one hand, these are globally valid MIBs, which are specified and described in RFCs
(Request for Comment). This includes, for example, MIB2 according to RFC1213, which
is supported by all SNMP-compatible network devices. On the other hand, manufacturers
can specify their own private SNMP objects, which are then assigned to a private manu-
facturer area in the large SNMP object tree. Manufacturers are then responsible for their
own private (enterprise) areas, i.e., they must ensure that only one object is assigned to an
object ID (object name and parameters) and can be published. If an object is no longer
needed, it can be labeled as “expired,” but it cannot be reused with other parameters under
any circumstances.
Reading SNMP objects is not password-protected. However, a password is required for read
access in SNMP, but this is set to “public,” which is usual for network devices, and cannot
be modified. By default upon delivery, the password for write access is “private” and can be