1. Backbone Support for Host Mobility: A Joint ORBIT/VINI Experiment Jennifer Rexford Princeton University Joint work with the ORBIT team (Rutgers) and Andy Bavier and Changhoon Kim (Princeton)

2. 2 Mobility Challenges Seamless transmission to a mobile host A B

3. 3 No Backbone Changes: Mobile IP Mobile node has home address & care-of address Care-of address changes as mobile node moves Packets relayed through the home agent to node B home agent 12.34.45.7 73.26.101.3

4. 4 Injecting Address of Mobile Node Mobile node has a single, persistent address Address injected into routing protocol (e.g., OSPF) But, flat addressing causes scalability challenges B 12.34.45.0/24 A 12.34.45.7/32 Similar to approach used in the Boeing Connexion service…

5. 5 Scalable Flat Addressing: SEIZE Storing location information at a small set of nodes Fetching based on hash of address, then caching Cut-through to send traffic directly to mobile node B A 12.34.45.7 h(12.34.45.7) Publish location Query location http://www.cs.princeton.edu/~chkim/publications/conext06-chkim.pdf

6. 6 VINI: Virtual Network Infrastructure VINI design –Multiple virtual networks on a shared substrate –Each virtual network may have its own topology –Connects to the Internet and carries real traffic –Experimenter can inject network events (e.g., failures) VINI deployment –Abilene Internet2 backbone (11 sites) –National Lambda Rail (7 sites) Example experiments –Intradomain routing protocol convergence –New routing and forwarding architectures

7. 7 Intradomain Routing and Forwarding s c 1176 587 846 260 700 639 1295 2095 902 548 233 1893 366 856 Abilene topology and intradomain routing configuration

8. 8 Joint ORBIT and VINI Experiment ORBIT: wireless edge –Two wireless access points –Each tunneled to a different VINI node –Mobile device that moves back and forth VINI: wired backbone –Virtual network topology (e.g., Abilene backbone) –Option #1: OSPF with /32 route injection –Option #2: scalable flat addressing with SEIZE Experiment –Download a video stream as the wireless node moves –Measure and observe quality of the video stream –Measure state and flooding overhead in the backbone

9. 9 Conclusion Wired networks should support mobility –Route injection of mobile node addresses –Scalable support for flat addressing Evaluation requires joint capabilities –Wireless devices, access points, and mobility –Wired networks with programmable protocols Initial experiments spanning ORBIT and VINI –Work in progress…