DGS-3420-28SC-L3MGMT-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › DGS-3420-28SC-L3MGMT-MIB

Last Updated: 2016-06-14

Category: Technology: Routing/L3, Vendor: D-Link

Description: Covers Layer 3 management and routing protocols for the D-Link DGS-3420-28SC SFP switch.

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What Is DGS-3420-28SC-L3MGMT-MIB?

DGS-3420-28SC-L3MGMT-MIB is a D-Link enterprise MIB providing the Layer 3 network-management structure for the DGS-3420-28SC managed SFP switch, part of D-Link's proprietary switch management tree. In the sampled objects it exposes OSPF Equal-Cost Multi-Path (ECMP) configuration and route-preference settings, i.e. Layer 3 routing configuration and behavior rather than raw hardware sensors. It supports monitoring of software/routing status by letting an operator confirm ECMP hashing behavior (CRC- or L4-port-based) and route preference values are set as intended, and whether an OSPF link-state-database management object is populated, which is useful when diagnosing uneven traffic distribution across equal-cost OSPF paths. It is one module of D-Link's broader Layer 3 management MIB tree and assumes an underlying OSPF routing implementation. It is typically deployed on D-Link DGS-3420-28SC switches in enterprise or campus networks running OSPF with multiple equal-cost paths. Engineers can download the DGS-3420-28SC-L3MGMT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DGS-3420-28SC-L3MGMT-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-3420-28SC managed switch

Monitoring Examples

An operator checks swL3OspfECMPState to confirm ECMP load-balancing is enabled for OSPF routes, then reviews swL3OspfECMPCrcHigh and swL3OspfECMPTCPorUDPport to determine whether the switch is hashing flows by CRC or by L4 TCP/UDP port, which affects how traffic is distributed across equal-cost paths. Polling swL3RoutePreference reveals the configured preference value used to select among routing sources, and the --swL3OspfLsdbMgmt object suggests an OSPF link-state database management branch worth checking if route computation looks stale.

What Can Be Monitored

  • OSPF ECMP enable/disable state
  • ECMP hashing method (CRC vs L4 port)
  • route preference value
  • OSPF link-state database management status
Imported Objects

From IF-MIB

InterfaceIndex

From IPV6-TC

Ipv6Address

From OSPF-MIB

AreaID
DesignatedRouterPriority
HelloRange
Metric
PositiveInteger
RouterID
Status
TOSType
UpToMaxAge

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
MacAddress
PhysAddress
RowStatus
TimeStamp
TruthValue

From SWDGS3420PRIMGMT-MIB

dlink-Dgs3420Proj-Dgs3420-28SC

How to Use in IPNetwork Monitor

Example using swL3ospfVirtIfEvents OID:

Select a D-Link DGS-3420-28SC managed switch (L3) 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 swL3ospfVirtIfEvents 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 number of state changes or error events on this Virtual Link. 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

L3 management MIB for D-Link DGS-3420-28SC SFP switch covering routing protocols and Layer 3 management features.

Start monitoring D-Link DGS-3420-28SC managed switch (L3) 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 DGS-3420-28SC-L3MGMT-MIB