Remember – VTP is sent untagged (so ends up on the native VLAN)

Posted on 2010/12/14 by

When VTP sends updates, they are sent without tags. So (assuming the native VLAN is VLAN 1) if you have restricted your trunk port at the receiving end with a command like:

switchport trunk allowed vlan 2,10,20

it will drop all untagged traffic – including the VTP updates.
Solution

switchport trunk allowed vlan add 1
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About RedNectar Chris Welsh

Professional IT Instructor. All things TCP/IP, Cisco or VoIP
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One Response to Remember – VTP is sent untagged (so ends up on the native VLAN)

  1. PZ says:
    2011/04/13 at 07:10

    You can always change the native vlan to some other number (on both sides of the trunk) and VTP updates should flow if you disable VLAN 1 like we do.

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