Snmp Settings; Traps; Mibs - D-Link xStack DES-3200 Series Installation Manual

xStack® DES-3200 Series Layer 2 Ethernet Managed Switch Hardware Installation Guide

NOTICE: In case of lost passwords or password corruption, please refer to the section titled

"Password Recovery Procedure" in Appendix B of the CLI Reference Guide" which will guide you

through the steps necessary to resolve this issue.

Simple Network Management Protocol (SNMP) is an OSI Layer 7 (Application Layer) designed specifically for

managing and monitoring network devices. SNMP enables network management stations to read and modify the

settings of gateways, routers, switches, and other network devices. Use SNMP to configure system features for proper

operation, monitor performance and detect potential problems in the Switch, switch group or network.

Managed devices that support SNMP include software (referred to as an agent), which runs locally on the device. A

defined set of variables (managed objects) is maintained by the SNMP agent and used to manage the device. These

objects are defined in a Management Information Base (MIB), which provides a standard presentation of the

information controlled by the SNMP agent. SNMP defines both the format of the MIB specifications and the protocol

used to access this information over the network.

The Switch supports SNMP versions 1, 2c, and 3. You can specify which version of SNMP you want to use to monitor

and control the Switch. The three versions of SNMP vary in the level of security provided between the management

station and the network device.

In SNMP v.1 and v.2, user authentication is accomplished using 'community strings', which function like passwords.

The remote user SNMP application and the Switch SNMP must use the same community string. SNMP packets from

any station that has not been authenticated are ignored (dropped).

The default community strings for the Switch used for SNMP v.1 and v.2 management access are:

 public - Allows authorized management stations to retrieve MIB objects.

 private - Allows authorized management stations to retrieve and modify MIB objects.

SNMP v.3 uses a more sophisticated authentication process that is separated into two parts. The first part is to

maintain a list of users and their attributes that are allowed to act as SNMP managers. The second part describes

what each user on that list can do as an SNMP manager.

The Switch allows groups of users to be listed and configured with a shared set of privileges. The SNMP version may

also be set for a listed group of SNMP managers. Thus, you may create a group of SNMP managers that are allowed

to view read-only information or receive traps using SNMP v.1 while assigning a higher level of security to another

group, granting read/write privileges using SNMP v.3.

Using SNMP v.3 individual users or groups of SNMP managers can be allowed to perform or be restricted from

performing specific SNMP management functions. The functions allowed or restricted are defined using the Object

Identifier (OID) associated with a specific MIB. An additional layer of security is available for SNMP v.3 in that SNMP

messages may be encrypted. To read more about how to configure SNMP v.3 settings for the Switch read the section

entitled Management.

Traps are messages that alert network personnel of events that occur on the Switch. The events can be as serious as

a reboot (someone accidentally turned OFF the Switch), or less serious like a port status change. The Switch

generates traps and sends them to the trap recipient (or network manager). Typical traps include trap messages for

Authentication Failure and Topology Change.

The Switch in the Management Information Base (MIB) stores management and counter information. The Switch uses

the standard MIB-II Management Information Base module. Consequently, values for MIB objects can be retrieved

from any SNMP-based network management software. In addition to the standard MIB-II, the Switch also supports its

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