GRE Tunnel configuration

[Toredo Del Marco]

So I have this topography below, I've already done objectives 1-4

Now, how can i configure the GRE tunnels below? I can only configure one simple GRE tunnel.
GRE tunnels are the networks inside the rectangle with a blue green color

[Joseph W. Doherty]

Could you further explain how you configured one GRE tunnel, as from you diagram you need two per router.

[Toredo Del Marco]

Sorry, I meant that i only know how to configure one simple tunnel per router, not two per router like from the diagram

[Joseph W. Doherty]

You configure additional GRE tunnels the same; they just need different interface names, e.g. tunnel1, tunnel2, etc.

[Jaderson Pessoa]

@Toredo Del Marco Hello,

Looks configuration below;

R1

interface tunnel 0
ip address 1.1.1.1 255.255.255.252
tunnel mode gre ip
tunnel source 122.88.71.1
tunnel destination 122.88.71.2

interface tunnel 1
ip address 4.4.4.2 255.255.255.252
tunnel mode gre ip
tunnel source 122.88.71.1
tunnel destination 122.88.71.2

R2

interface tunnel 0
ip address 1.1.1.2 255.255.255.252
tunnel mode gre ip
tunnel source 10.29.12.1
tunnel destination 10.29.12.2

interface tunnel 1
ip address 2.2.2.1 255.255.255.252
tunnel mode gre ip
tunnel source 10.29.12.1
tunnel destination 10.29.12.2

R3

interface tunnel 0
ip address 2.2.2.2 255.255.255.252
tunnel mode gre ip
tunnel source 192.16.1.1
tunnel destination 192.16.1.2

interface tunnel 1
ip address 3.3.3.1 255.255.255.252
tunnel mode gre ip
tunnel source 192.16.1.1
tunnel destination 192.16.1.2

R4

interface tunnel 0
ip address 3.3.3.2 255.255.255.252
tunnel mode gre ip
tunnel source 172.168.0.1
tunnel destination 172.168.0.2

interface tunnel 1
ip address 4.4.4.1 255.255.255.252
tunnel mode gre ip
tunnel source 172.168.0.1
tunnel destination 172.168.0.2