GRE Configuration #
Define the Tunnel Interface #
Router(config)# interface Tunnel<tunnel_id>
Router(config-if)# ip address <ip_address> <subnet_mask>
Set the Source and Destination #
Router(config-if)# tunnel source <interface>
Router(config-if)# tunnel destination <ip_address>
Specify the Tunnel Mode #
Router(config-if)# tunnel mode gre ip
Verify the Tunnel Configuration #
Router# show interface Tunnel<tunnel_id>