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DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual

SNMP Settings

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 on-board SNMP agent. SNMP defines both the format of the MIB specifications and the

protocol used to access this information over the network.

The DAS-3626 supports the SNMP versions 1, 2c, and 3. The default SNMP setting is disabled. You must enable

SNMP. Once SNMP is enabled you can choose which version 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.

SNMPv3 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 SNMPv1 while assigning a higher level of security to another

group, granting read/write privileges using SNMPv3.

Using SNMPv3 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 SNMPv3 in that SNMP

messages may be encrypted. To read more about how to configure SNMPv3 settings for the switch read the next

section.

Traps

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, Topology Change and Broadcast\Multicast Storm.

MIBs

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

own proprietary enterprise MIB as an extended Management Information Base. Specifying the MIB Object Identifier

may also retrieve the proprietary MIB. MIB values can be either read-only or read-write.

The incorporates a flexible SNMP management for the switching environment. SNMP management can be

customized to suit the needs of the networks and the preferences of the network administrator. Use the SNMP V3

menus to select the SNMP version used for specific tasks.

The DAS-3626 supports the Simple Network Management Protocol (SNMP) versions 1, 2c, and 3. The administrator

can specify the SNMP version used 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.

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D-Link DGS-3700 User Manual Page 155

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