DGS-3420-28TC-L3MGMT-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › DGS-3420-28TC-L3MGMT-MIB

Last Updated: 2016-06-14

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

Description: L3 management MIB for D-Link DGS-3420-28TC switch covering routing, OSPF, VRRP, and Layer 3 management objects.

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

DGS-3420-28TC-L3MGMT-MIB is a proprietary D-Link enterprise MIB extending Layer 3 management for the DGS-3420-28TC switch, covering routing, OSPF, VRRP, and other advanced Layer 3 management objects. It exposes OSPF equal-cost multipath (ECMP) hashing configuration and system-wide route preference settings, consistent with the same object pattern found across the D-Link DES/DGS L3MGMT MIB family. Its monitoring value is confirming OSPF load-balancing behavior is correctly configured and understanding routing-protocol precedence on the switch, which matters for traffic distribution and failover, and by extension for the health of VRRP-based redundancy referenced in the module's scope. It implements IETF OSPF ECMP and VRRP concepts as D-Link private enterprise objects rather than the standard OSPF-MIB/VRRP-MIB. It is typically deployed on DGS-3420-28TC switches used as Layer 3 core or aggregation switches in enterprise networks requiring gateway redundancy, where DGS-3420-28TC-L3MGMT-MIB SNMP monitoring verifies OSPF and VRRP behavior.

IPNetwork Monitor allows you to monitor SNMP objects defined in DGS-3420-28TC-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-3420-28TC switch
  • D-Link DGS-3420 series L3 switches

Monitoring Examples

An administrator would poll swL3OspfECMPCrcHigh, swL3OspfECMPTCPorUDPport, and swL3OspfECMPState to confirm OSPF ECMP load-balancing is enabled and using the expected hash inputs across redundant paths. swL3RoutePreference would be checked to confirm which routing protocol's routes are preferred when multiple sources advertise a route to the same destination, which is particularly important on a switch also running VRRP for gateway redundancy. A misconfigured ECMP state could explain uneven traffic distribution across otherwise identical uplinks.

What Can Be Monitored

  • OSPF ECMP hash configuration
  • OSPF ECMP enable state
  • route preference among routing protocols
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-Dgs3420-28TC

How to Use in IPNetwork Monitor

Example using swL3ospfVirtIfEvents OID:

Select a D-Link DGS-3420-28TC switch (L3, OSPF/VRRP) 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

Manages Layer 3 routing functions including IPv6, DHCP relay, VRRP, and BGP/RIP configuration on DGS switches.

Start monitoring D-Link DGS-3420-28TC switch (L3, OSPF/VRRP) 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-3420-28TC-L3MGMT-MIB