Backbone Support for Host Mobility: A Joint ORBIT/VINI Experiment

1
Backbone Support for Host MobilityA Joint
ORBIT/VINI Experiment

• Jennifer Rexford
• Princeton University

Joint work with the ORBIT team (Rutgers) and Andy
Bavier and Changhoon Kim (Princeton)
2
Mobility Challenges

• Seamless transmission to a mobile host

B
A
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
73.26.101.3
home agent
12.34.45.7
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

A
B
12.34.45.0/24
12.34.45.7/32
Similar to approach used in the Boeing Connexion
service
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

h(12.34.45.7)
Query location
Publish location
A
B
12.34.45.7
http//www.cs.princeton.edu/chkim/publications/co
next06-chkim.pdf
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
Intradomain Routing and Forwarding
s
2095
856
700
260
233
1295
c
639
548
366
846
587
902
1893
1176
Abilene topology and intradomain routing
configuration
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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
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