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Beginner

Vlan double tagging confusion

This is the first time i m learning networking. In netacad course book it was mentioned when a switch receives a tagged fram with same vlan id as native vlan on a trunk port, it will drop the frame.

so how an attacker is sending a tagged frame with native vlan id and instead of dropping the frame, when frame arrives at trunk port it strips off the native vlan tag and forward it to other trunk links and native vlan interfaces?

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VIP Mentor

Re: Vlan double tagging confusion

there is good discussion on the community will help you to understand better :

 

 

https://community.cisco.com/t5/switching/vlan-double-tagging/m-p/2886031

https://community.cisco.com/t5/switching/double-tagged-vlan-termination/m-p/4009891

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Collaborator

Re: Vlan double tagging confusion

Hi,

 

    Find a very good explanation here, in one of the Cisco Press books.

 

Regards,

Cristian Matei.

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