Quick troubleshooting view
A trunk link works partially but some VLANs do not cross.
- ι VLAN list
- t Incoherent
- VLAN mismatch
- Compare both ends
- Controlling the TT
- TesterMatt table
- Align, VLAN
- Correct t +
- Uniformiser native VLAN
Contextual technician plan
Check for the licensed Bonn and VLAN mode.
“Compare both ends” should produce an observation that clearly confirms or rules out “ι VLAN list”.
If the observation is normal, lower “ι VLAN list” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “ι VLAN list” first. Related action: Align, VLAN.
Check PVID/native VLAN.
“Controlling the TT” should produce an observation that clearly confirms or rules out “t Incoherent”.
If the observation is normal, lower “t Incoherent” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “t Incoherent” first. Related action: Correct t +.
Observer if VLAN's Macs appear.
“TesterMatt table” should produce an observation that clearly confirms or rules out “VLAN mismatch”.
If the observation is normal, lower “VLAN mismatch” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “VLAN mismatch” first. Related action: Uniformiser native VLAN.
Repeat the same validation test after the correction and confirm the original symptom is gone. Validate stability before closing the incident.
Before changing configuration, record the current value and a way back.
Clam if topology contains several trunks and STP loops.
A trunk link works partially but some VLANs do not cross.
Causes probables
- ι VLAN list
- t Incoherent
- VLAN mismatch
Diagnostic étape par étape
- 1
Compare both ends
Check for the licensed Bonn and VLAN mode.
- 2
Controlling the TT
Check PVID/native VLAN.
- 3
TesterMatt table
Observer if VLAN's Macs appear.
Solutions possibles
- Align, VLAN
- Correct t +
- Uniformiser native VLAN
Clam if topology contains several trunks and STP loops.