Configuring Point-to-Point GRE Tunnel for Router A

device# configure terminal
device(config)# interface ethernet 1/3/1
device(config-if-e1000-1/3/1)# ip address 36.0.8.108/24
device(config)# exit
device(config)# interface tunnel 1 
device(config-tnif-1)# tunnel source 36.0.8.108
device(config-tnif-1)# tunnel destination 131.108.5.2
device(config-tnif-1)# tunnel mode gre ip
device(config-tnif-1)# tunnel loopback 4/1
device(config-tnif-1)# ip address 10.10.3.1/24
device(config-tnif-1)# exit
device(config)# ip route 131.108.5.0/24 10.0.8.1
device(config)# ip route 10.10.2.0/24 tunnel 1