All MIBs › Q-BRIDGE-MIB › dot1qVlanFdbId
dot1qVlanFdbId
Module: Q-BRIDGE-MIB
OID (symbolic): Q-BRIDGE-MIB::dot1qVlanFdbId
OID (numeric): 1.3.6.1.2.1.17.7.1.4.2.1.3
Node type: OBJECT-TYPE
Type: Unsigned32
Access: read-only
Description:
The Filtering Database used by this VLAN. This is one of the dot1qFdbId values in the dot1qFdbTable. This value is allocated automatically by the device whenever
the VLAN is created: either dynamically by GVRP, or by management, in dot1qVlanStaticTable. Allocation of this value follows the learning constraints defined for this VLAN in dot1qLearningConstraintsTable.
What is dot1qVlanFdbId?
This is a number that identifies which internal filtering database the VLAN uses for MAC address learning. Network engineers use this to understand how the switch organizes MAC table resources across VLANs. For example, multiple VLANs might share database ID 3 if the switch pools filtering resources.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.2.1.17.7.1.4.2.1.3 snmpwalk -v2c -c public <target> Q-BRIDGE-MIB::dot1qVlanFdbId
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.2.1.17.7.1.4.2.1.3.1 snmpget -v2c -c public <target> Q-BRIDGE-MIB::dot1qVlanFdbId.1
OID Breakdown
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | BIANCA-BRICK-PPP-MIB |
| 1.3.6 | dod | BIANCA-BRICK-PPP-MIB |
| 1.3.6.1 | internet | BIANCA-BRICK-PPP-MIB |
| 1.3.6.1.2 | mgmt | BKTEL-HFC862-BASE-MIB |
| 1.3.6.1.2.1 | mib_2 | CHECKPOINT-MIB-2 |
| 1.3.6.1.2.1.17 | dot1dBridge | BRIDGE-MIB |
| 1.3.6.1.2.1.17.7 | qBridgeMIB | Q-BRIDGE-MIB |
| 1.3.6.1.2.1.17.7.1 | qBridgeMIBObjects | Q-BRIDGE-MIB |
| 1.3.6.1.2.1.17.7.1.4 | dot1qVlan | Q-BRIDGE-MIB |
| 1.3.6.1.2.1.17.7.1.4.2 | dot1qVlanCurrentTable | Q-BRIDGE-MIB |
| 1.3.6.1.2.1.17.7.1.4.2.1 | dot1qVlanCurrentEntry | Q-BRIDGE-MIB |
| 1.3.6.1.2.1.17.7.1.4.2.1.3 | dot1qVlanFdbId | Q-BRIDGE-MIB |
FAQ
What does dot1qVlanFdbId tell me about a VLAN?
It's the identifier of the Filtering Database (FDB) that this VLAN uses to learn and store MAC addresses — it points to a row in dot1qFdbTable. The switch assigns this automatically when the VLAN is created, either dynamically via GVRP or when you configure it manually in dot1qVlanStaticTable.
Why do two different VLANs on my switch show the same dot1qVlanFdbId?
That means the switch is using Shared VLAN Learning (SVL) for those VLANs — they share one MAC address table, so a host's MAC learned on one VLAN is visible on the other. If you need independent MAC tables per VLAN (IVL), check the device's learning-constraints configuration (dot1qLearningConstraintsTable), since FDB allocation follows those constraints.