The abbreviated name for the tunnel interface in the output of a VPN boot-up sequence output is; VTI - Virtual Tunnel Interface.
Virtual Tunnel Interface (VTI) as the name implies is a virtual interface whose main function is simply establishing a Route-Based VPN tunnel.
The ASA supports a logical interface termed Virtual Tunnel Interface (VTI).
In a bid to replace policy based VPN, a VPN tunnel can be created between peers with Virtual Tunnel Interfaces configured. This consequently supports route based VPN with IPsec profiles attached to the end of each tunnel.
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