Ccna routing and Switching Complete Study Guide

ip address 63.1.1.2 255.255.255.252

SF(config-if)#

int t0

SF(config-if)#

ip address 192.168.10.2 255.255.255.0

SF(config-if)#

tunnel source 63.1.1.2

SF(config-if)#

tun destination 63.1.1.1

*May 19 22:46:37.099: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, 

changed state to up

Oops—did I forget to set my tunnel mode and transport to GRE and IP on the SF 

router? No, I didn’t need to because it’s the default tunnel mode on Cisco IOS. Nice! So, 

first I set the physical interface IP address (which used a global address even though I didn’t 

have to), then I created the tunnel interface and set the IP address of the tunnel interface. 

It’s really important that you remember to configure the tunnel interface with the actual 

source and destination IP addresses to use or the tunnel won’t come up. In my example, the 

63.1.1.2 was the source and 63.1.1.1 was the destination.