GRE Tunnel Configuration with Cisco Packet Tracer


Packet Tracer GRE Tunnel Configuration

In this confgiuration example, we will see how to configure Cisco GRE (Generic Routing Encapsulation) Tunnel with Packet Tracer. For our GRE Tunnel Configuration example, we will use the below topology and the given IP addresses.


You can DOWNLOAD the Cisco Packet Tracer example with .pkt format At the End of This Lesson.

You can also DOWNLOAD all the Packet Tracer examples with .pkt format in Packet Tracer Labs section.

Here, we assume that all the IP Configurations have been done and we will focus only GRE Tunel Configuration with Packet Tracer. Let’s start with Router 0.


GRE Tunnel Configuration

In Router 0, we will create the Tunnel interface and then give this interface an IP Address. After that, we we will define the Tunnel Source, with IP Address or with Interface name. Here, we used Interface name. Lastly, we define the Tunnel Destination IP address.


R0(config)# interface Tunnel 1

R0(config-if)# ip address
R0(config-if)# tunnel source FastEthernet 0/0
R0(config-if)# tunnel destination
R0(config-if)# end
R0# copy running-config startup-config


Now, let’s configure Router 2. We will do the same configuration on Router 2, only IP addresses will change.


R2(config)# interface Tunnel 1
R2(config-if)# ip address
R2(config-if)# tunnel source FastEthernet 0/0
R2(config-if)# tunnel destination
R2(config-if)# end
R2# copy running-config startup-config


GRE Tunnel Static Route

After Tunnel configuration, we need to write a Static Route on Router 0 and Router 2. Because, the routers needs to know how to reach to the users connected to the other end router. In other words, because of the fact that the other end LAN is not directly connected to the router, it needs routing information and we provide this with a Static Route.


R0(config)# ip route
R0(config)# end
R0# copy running-config startup-config


R2(config)# ip route

R2(config)# end

R2# copy running-config startup-config


GRE Tunnel Verification

Now, it is time to verification. Let’s verify our GRE Tunnel Configuration.


For Tunnel verification, we can use the “show interface tunnel 1” command. And for the IP addresses of Tunnels with other IP interfaces, we can use “show ip interfaces brief” command.


R0# show interfaces tunnel 1




R0# show ip interface brief




After this verification, we can use “ping” and “tracert” commands on PCs, to reach to the other end.


PC0> ping


PC0> tracert
PC3> ping

PC3> tracert


You can DOWNLOAD the Cisco Packet Tracer example with .pkt format HERE.

To learn more on GRE, visit GRE Overview lesson.



Lesson tags: cisco packet tracer, GRE
Back to: CCNP Enterprise 350-401 ENCOR > Path Virtualization

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CCNP Enterprise 350-401 ENCOR