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OSPF for Broadband Wireless Campus Backbone

OSPF for Broadband Wireless Campus Backbone. Joseph Hui ISS Chair Professor and Director, Telecommunications Research Center Arizona State University. Talk Outline. Applications for Wireless Broadband Campus Networks Optical versus Radio Frequency OSPF for Broadband Wireless Networks

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OSPF for Broadband Wireless Campus Backbone

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  1. OSPF for Broadband Wireless Campus Backbone Joseph Hui ISS Chair Professor and Director, Telecommunications Research Center Arizona State University

  2. Talk Outline • Applications for Wireless Broadband Campus Networks • Optical versus Radio Frequency • OSPF for Broadband Wireless Networks • On-going embedded system prototype.

  3. Applications of Broadband Wireless Backbone • Large data storage facilities scattered on campus • Growing need for multimedia educational material storage/retrieval • Digital/video libraries • Massive data stores (Mars Probe, 3D models) • Wireless LAN hot spots • Portable wireless multimedia booths?

  4. ASU Campus Backbone • Hub and Spoke Gigabit Ethernet. • Three level hierarchical network • East-Central-West Campus • A few isolated, off-campus buildings • Want: Scalable and reconfigurable networks • Solutions: • Wireless broadband • Distributed Storage Area Networks • Reliable OSPF protocol for wireless links

  5. Proposed Broadband Wireless Network Topology • An adjunct broadband wireless network • Mesh/Ring network for the second tier hubs • Mesh/relay network for third tier nodes

  6. Advantages of optics: No spectrum licensing No multipath problems Cheaper/smaller transceivers high speed/DWDM Excellent channel isolation Security Advantages of radio: LOS not mandatory Longer distances More weather resistant Less background noise Ease of pointing Eye safe Optical versus Radio Networks

  7. Going Optical

  8. Current approaches LMDS for WLL, not backbone Hub architecture Shared bandwidth LEC model DSL over ATM Proposed Approach: Totally wireless backbone, no distinguishable local loops. Mesh architecture Multiple parallel paths Internet model {SCSI,FC,10xBaseT,TCP,IB} over IP Wireless Campus Network

  9. Key Challenges • Optical links • propagation, pointing, power budget, eye safety • Data links • link/node failure, traffic measurements, QoS control • Network routing/management • Ad-hoc routing, IP switching, resource discovery, traffic balancing, domain management • System Analysis • Interface interoperability, multiple protocols, device mapping/configurations.

  10. Meshed Networks Fully Meshed (Each and every node is connected to all others by no more than one hop) Partially Meshed (A node may be connected to other nodes by more than one hop) Fragile Networks Any link of the network may become inoperative at any time. The failure of a single link should not prohibit message delivery Network Types

  11. The Effect of Fragility(Providing A High Availability Environment) • Router Failure • CPE Failure • Premise Link Failure • Link Failure

  12. Protocols for Wireless Optical Ad-Hoc Networks 1. Link-state monitoring 2. QoS provisioning 3. Rapid yet distributed rerouting upon link/node failure 4. Resource discovery and management 5. Multi-protocol adaptations

  13. Reliable IP based on OSPF • OSPF is the predominant IP protocol for • Intra-domain, distributed, link-state based routing • Problem: rerouting require broadcast of link-state • To make OSPF reliable • QoS control based on DiffServ, TOS queue scheduling • Pre-compute multiple paths based on QoS and link failure • Rapid switch over to source routing if link or node fails • Problem: Is it possible to retain much of OSPF distributed computation, yet able to route correctly when link/node fails?

  14. Reliable IP based on OSPF • Answer is Yes! • Multipath OSPF with IP-encapsulation for source routing • Node broadcasts link state infrequently • Each node compute multiple paths contingent on fault/QoS • Multiple IP for QoS assignments • Use of IP encapsulation to forward packets along precomputed path.

  15. Experimental Prototypes • The Existing Project • Pizza box Router for Network Edge use based on IP • Free Space Laser Link at 850 nm and 1Gb/s • Millimeter Wave RF Link at 57-64 GHz and 1 Gb/s • Applied both indoor and outdoor

  16. Conclusion • Distributed Router Development • Protocol (Reliable IP) • QoS Routing and QoS Link Management • Network Management (IP encapsulation) • Mirroring and Multicasting • Four link implementations at 1 GHz • Free Space Laser • Wireless Millimeter Wave • Fiber optic • Copper • Currently soliciting public and private funding for prototype

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