Native VLAN CCNA lab
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Lab 17
Native VLAN — Configure & Fix Native VLAN Mismatch
SW1 & SW2 consoles ready — observe the mismatch, then fix it
Lab Tasks
Observe native VLAN mismatch — SW1 native=1, SW2 native=99
Create VLAN 99 on SW1 — name Native
Set native VLAN 99 on SW1 trunk Gi0/1
Create VLAN 99 on SW2 — name Native
Set native VLAN 99 on SW2 trunk Gi0/1
Verify with show interfaces trunk — both match
Command Guide
— On both SW1 and SW2 —
vlan 99
name Native
int gi0/1
sw trunk native vlan 99
show interfaces trunk
show interfaces gi0/1 trunk
— See the mismatch first —
show interfaces trunk
! CDP: native vlan mismatch!
vlan 99
name Native
int gi0/1
sw trunk native vlan 99
show interfaces trunk
show interfaces gi0/1 trunk
— See the mismatch first —
show interfaces trunk
! CDP: native vlan mismatch!
Topology Info
SW1 Gi0/1 ←trunk→
SW2 Gi0/1
Before fix:
SW1 native = VLAN 1
SW2 native = VLAN 99
After fix:
Both native = VLAN 99
SW2 Gi0/1
Before fix:
SW1 native = VLAN 1
SW2 native = VLAN 99
After fix:
Both native = VLAN 99
Switch SW1 — Console
Switch SW2 — Console
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