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What are the uses of sub interfaces on a Cisco router?

What are the uses of sub interfaces on a Cisco router?

You would use sub-interfaces when you need to have meshed (partial or full) but have lesser number of physical interfaces. Or when you need to run various protocols between two locations. Sub interfaces were created basically to handle issues like split horizon but over the period of time have gained popularity as they give you flexibility in configurations and your design.
 

This was last published in July 2003

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