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How to pass VLAN Trunking Protocol (VTP) information over a WAN link

Resolution

It is not possible to pass VTP information through a WAN link because VTP is a Layer 2 messaging protocol and only passes through a trunk port.

In other words, routers do not understand VTP and do not forward it.

For more information about why VTP information is not exchanged, refer to the Catalyst Switches Do Not Exchange VTP Information section of Understanding and Configuring VLAN Trunk Protocol (VTP).

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