Cisco 6000 Series Configuration Manual page 156

Configuring IP-in-IP Decapsulation
IP-in-IP Decapsulation
Figure 3: Basic Encapsulation and De-capsulation with an IP-in-IP
Tunnel
Use Case: Configure IP-in-IP de-capsulation
The following topology describes a use case where IP-in-IP encapsulation and de-capsulation is used for
different segments of the network from source to destination. The IP-in-IP tunnel consists of multiple routers
used to de-capsulate and direct the packet through the data center fabric network.
Figure 4: IP-in-IP De-capsulation through a Data Center Network
The following illustration shows how the stacked IPv4 headers are de-capsulated as they traverse through the
de-capsulating routers.
Figure 5: IP Header De-capsulation
Stacked IP Header in an Encapsulated Packet
The encapsulated packet will have an outer IPv4 header stacked over the original IPv4 header, as shown in
the following illustration.
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
144