The following are examples of problems and possible solutions:
- Interface must be up/up
- Encapsulation must match both sides
SwitchA#show interface fa1/1 switchport
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Disabled
Access Mode VLAN: 0 ((Inactive))
VLAN information not passing?
- Is the VLAN blocked on the trunk?
Switch#show interface trunk
VTP information not reaching the client?
- Correct domain and VTP password?
show . . .
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