SDN and Wireless Network. Seungwon Shin KAIST

Transcription

1 SDN and Wireless Network Seungwon Shin KAIST

2 Background First, we need to talk about traditional network devices Consist of two main components Control path (plane) decision module (e.g., routing) Data path (plane) packet forwarding module

3 Problem with Internet Infrastructure? Routing, management, mobility management, access control, VPNs, Feature Operating System Feature Million of lines of source code RFCs Specialized Packet Forwar ding Hardware Billions of gates Bloated Power Hungry Vertically integrated, complex, closed, proprietary Not suitable for experimental ideas Not good for network owners & users; Not good for researchers.

4 Problem of Legacy Network Devices Too complicated Control plane is implemented with complicated S/W and ASIC Closed platform Vendor specific Hard to modify (nearly impossible) Hard to add new functionalities New proposal: Software Defined Networking Separate the control plane from the data plane

5 Software Defined Networking (SDN) Three layers Application layer Application part Implements logic Control layer (controller) Kernel part Runs applications Infrastructure layer Network switch or router Control Path Data Path OpenFlow From Open Networking Foundation

6 The Software-defined Network 3. Well-defined open API App App App 2. At least one good operating system Extensible, possibly open-source Network Operating System 1. Open interface to hardware Simple Packet For warding Hardwar e Simple Packet For warding Hardwar e Simple Packet For warding Hardwar e Simple Packet For warding Hardwar e Simple Packet For warding Hardwar e Slide from Nick McKeown at Stanford

7 Trend App App App App App App Windows Windows Windows (OS) (OS) (OS) Linux Linux Linux Mac Mac Mac OS OS OS Controller Controller NOX 1 1 (Network OS) Controller Controller Network 22 OS Virtualization layer x86 (Computer) Virtualization or Slicing OpenFlow Computer Industry Network Industry Slide from Nick McKeown at Stanford

8 SDN Operation L2 Forwarding a pplication Controller (e.g., NOX) SDN Controller (1) (5) (2) (3) SDN Switch (4) Host A A B: Forward Host B Flow Table in SDN Switch

9 Wireless Network with SDN For researcher New wireless network environment OpenRoad Software Defined Cellular For practitioneer Seamless handover Odin project Manage home gateway system Bismark project

10 OpenRoad People KK Yap and Guru Palrukar at Stanford University Goal Provide efficient wireless network services with SDN

11 OpenRoad What they want Slide from KK Yap at Stanford

12 OpenRoad Overall scenario Use SNMP protocol to check the availability of Aps Each network controller operates different network applications Each user can share APs, but they can see different network Network virtualization

13 CellSDN Slide from Li Erran Li at Columbia

14 CellSDN No clear separation of control plane and data plane Control Plane Data Plane Mobility Mana gement Entity ( MME) Home Subsc riber Server (HSS) Policy Control and Charging Rules Fu nction (PCRF) Problem with Intertechnology (e.g. 3G to LTE) handoff Problem of inefficient radio resource allocation User Equip ment (UE) Base Serving Packet Data Station (enodeb) Gateway (S-GW) Network Gateway (P-GW) Slide from Li Erran Li at Columbia

15 CellSDN Architecture CellSDN provides scalable, fine-grain real time control with extensions: Controller: fine-grain policies on subscriber attributes Switch software: local control agents to improve control plane scalability Switch hardware: fine-grain packet processing to support DPI Base stations: remote control and virtualization to enable flexible real time radio resource management

16 CellSDN Slide from Li Erran Li at Columbia

17 CellSDN Slide from Li Erran Li at Columbia

18 BISMark Project People GIT Lead by Prof. Nick Feamster Goal Measuring access link performance What factors affect performance? Measuring application performance Study of Web download times Representing performance to users Performance does not just depend on throughput What other factors matter? How to represent them to users? Slide from Nick Feamster at GIT

19 Challenge: Confounding Factors From Gateway Downstream Upstream 5.62 Mbit/s 452 Kbits/s Slide from Nick Feamster at GIT 19

20 BISMark: A View from the Gateway Periodic measurements to last mile and end-to-end Measure directly at the gateway device Adjust for confounding factors Slide from Nick Feamster at GIT 20

21 BISMark Deploy programmable gateways in homes Deployment NOX Box NetGear WNDR 3700, others SamKnows about 10,000 around the U.S. Netgear WNDR 3700 NoxBox Netgear 3500L Slide from Nick Feamster at GIT

22 Odin People Lead by Laith Suresh and Prof. Anja Feldman TU-Berlin Goal Provide seamless handoff to wireless network users

23 Odin Motivation Current wireless network environments are Vendor lock-in inflexible Slide from Laith Suresh at TU-Berlin

24 Odin Approach Enterprise WLAN services as network applications Requirements Should not modify client Should be simple in programming Slide from Laith Suresh at TU-Berlin

25 Odin How to LVAP Light Virtual AP LVAP migration Equal to Handoff Seamless handoff by Removing/Adding LVAP dynamically Slide from Laith Suresh at TU-Berlin

26 Odin Evaluation Normal client Odin client

27 Summary SDN? New network architecture Dynamic flow control, programmability, and more Usually employ into a wired-network environment However, Many people (mostly researchers) try to move this idea into a wireless network environment We don t know if it is successful But, we need to try and find something