Cisco 6000 Series Configuration Manual page 158

IP-in-IP Decapsulation
• ipv4 unnumbered loopback address: enables ipv4 packet processing without an explicit address, except
for loopback address.
• tunnel mode ipv4 decap: enables IP-in-IP de-capsulation.
• tunnel source: indicates the source address for the IP-in-IP decap tunnel w.r.t the router interface.
• tunnel destination: indicates the destination address for the IP-in-IP decap tunnel w.r.t the router interface.
Running Configuration
RP/0/RP0/CPU0:router# show running-config interface tunnel-ip 10
...
interface tunnel-ip 10
tunnel mode ipv4 decap
tunnel source Loopback 0
tunnel destination 10.10.1.2/32
This completes the configuration of IP-in-IP de-capsulation.
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
146
Configuring IP-in-IP Decapsulation