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You are here: Home / ICND1 / Day 3 – Trunking, DTP, and Inter-VLAN Routing / Day 3 Tasks / Troubleshooting Trunking and VTP

Troubleshooting Trunking and VTP

The following are examples of problems and possible solutions:

Trunk down?

  • Interface must be up/up
  • Encapsulation must match both sides

SwitchA#show interface fa1/1 switchport
Name: Fa1/1
Switchport: Enabled
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?

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