DLINK-3100-TRUNK-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

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Organization: Dlink, Inc.

Last Updated: 2006-12-02

Category: Technology: Link Aggregation, Vendor: D-Link

Description: Manages link aggregation (port trunking/LAG) group configuration and status on D-Link 3100 series switches.

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What Is DLINK-3100-TRUNK-MIB?

DLINK-3100-TRUNK-MIB is a D-Link enterprise MIB for the 3100 series switches that manages link aggregation (port trunking / LAG) group configuration and status, built on an IEEE 802.3ad (Dot3ad) aggregation model. It belongs to the Ethernet switching technology area and exposes data on aggregation balancing method, forwarding type, addressing layer used for load distribution, and a table of created trunk groups with their member port assignments. Its monitoring value lies in confirming link-aggregation health and configuration: verifying the number of active trunks against the maximum supported, the load-balancing algorithm in effect, and whether trunk creation is currently permitted, all of which affect aggregate link throughput and redundancy on the switch. It is explicitly modeled on IEEE 802.3ad link aggregation (Dot3ad) concepts, extending that standard with D-Link-specific balancing and creation-management objects. Typical deployment context is D-Link 3100 series switches in SMB or campus networks using trunked uplinks for bandwidth aggregation and link redundancy. Engineers can download the DLINK-3100-TRUNK-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DLINK-3100-TRUNK-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 3100 series switch

Monitoring Examples

An administrator reads rlDot3adAggNumOfTrunks against rlDot3adAggMaxPortsInTrunks to confirm current trunk usage is within supported limits, and inspects rlDot3adAggBalanceTable/rlDot3adAggBalanceEntry for rlDot3adAggBalanceForwardType and rlDot3adAggBalanceLayer to verify the load-distribution algorithm matches the intended design. If rlDot3adAggTrunkCreationSupport indicates trunk creation is disabled while rlDot3adAggCreationTable shows an incomplete trunk entry, that would flag a failed or blocked LAG provisioning attempt.

What Can Be Monitored

  • number of active trunk groups
  • max ports per trunk
  • load-balancing method/layer
  • trunk creation support status
  • trunk group member configuration
Imported Objects

From DLINK-3100-MIB

rndMODULE-IDENTITY

From IEEE8023-LAG-MIB

dot3adAggIndexOBJECT-TYPE
dot3adAggPortIndexOBJECT-TYPE

From SNMPv2-SMI

Counter32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

DisplayString
PhysAddress
RowStatus
TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using rlDot3adAggPortLacpPdusRx OID:

Select a D-Link 3100 series switch (DES/DGS-3100), link aggregation/trunking 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 rlDot3adAggPortLacpPdusRx 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 valid LACPDUs received on this Aggregation Port. 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 sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Manages IEEE 802.3ad link aggregation (trunk) balancing and load distribution for D-Link 3100 series switches.

Start monitoring D-Link 3100 series switch (DES/DGS-3100), link aggregation/trunking 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 DLINK-3100-TRUNK-MIB