DGS3426-L2MGMT-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › DGS3426-L2MGMT-MIB

Last Updated: 2000-07-15

Category: Technology: Switching/L2, Vendor: D-Link

Description: L2 management MIB for D-Link DGS-3426 24-port switch covering VLANs, STP, port security, and L2 management features.

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What Is DGS3426-L2MGMT-MIB?

DGS3426-L2MGMT-MIB is a D-Link proprietary MIB that structures Layer 2 network management information for the DGS-3426, a 24-port managed switch. It exposes VLAN configuration and membership data along with related switching controls, giving visibility into how the switch segments and forwards traffic at Layer 2. For monitoring purposes it is used to confirm the operational state of VLAN assignments and port membership, which indirectly reflects the health of the switch's L2 forwarding software rather than physical hardware sensors like fans or power supplies. It builds on standard bridge/VLAN concepts defined in IEEE 802.1Q and complements generic IETF bridge MIBs with D-Link-specific VLAN management objects. It is typically deployed in wiring closets or small-to-midsize enterprise networks where DGS-3426 switches provide access-layer or distribution-layer VLAN segmentation. Engineers can download the DGS3426-L2MGMT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DGS3426-L2MGMT-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • D-Link DGS-3426 managed switch

Monitoring Examples

An administrator would poll the swL2VlanTable (indexed by swL2VlanEntry/swL2VlanIndex) to retrieve swL2VlanName, swL2VlanType, and swL2VlanMemberPorts, confirming which ports belong to each configured VLAN. Comparing swL2VlanStaticPorts and swL2VlanStaticTaggedPorts against swL2VlanCurrentTaggedPorts and swL2VlanCurrentUntaggedPorts reveals whether the switch's live tagging state matches the intended static configuration, exposing misconfigurations such as a port dropped from a VLAN unexpectedly. Checking swL2VlanForbiddenPorts helps verify that security-restricted ports have not been added to a VLAN they should be excluded from. swL2VlanAdvertisementState can be polled to confirm whether GVRP-style VLAN advertisement is active on a given VLAN.

What Can Be Monitored

  • VLAN membership per port
  • static vs current tagged/untagged port state
  • VLAN name and type
  • forbidden port assignments
  • VLAN advertisement (GVRP) state
Imported Objects

From DLINK-ID-REC-MIB

AgentNotifyLevel

From RFC1155-SMI

Counter

From SNMPv2-SMI

Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION

From SW34XXPRIMGMT-MIB

dgs3426OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using swL2PortBufferFullDrops OID:

Select a D-Link DGS-3426 managed switch as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type swL2PortBufferFullDrops into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The total number of packets discarded while buffer full. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Layer 2 network management for D-Link DGS3426 switch, including VLANs, port security, trunking, and multicast control.

Start monitoring D-Link DGS-3426 managed switch with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download DGS3426-L2MGMT-MIB