Enables generic routing encapsulation (GRE) over a tunnel interface and specifies that the tunneling protocol is IPv4.
GRE is disabled.
Interface tunnel configuration mode
Use the no mode gre ip command to disable the GRE IP tunnel encapsulation method for the tunnel interface.
This example enables GRE IP encapsulation on a tunnel interface.
device# configure terminal device(config)# interface tunnel 5 device(config-intf-tunnel-5)# mode gre ip