Net SILOs: An Architecture to Enable Software Defined Optics

Transcription

1 Net SILOs: An Architecture to Enable Software Defined Optics George N. Rouskas Department of Computer Science North Carolina State University Joint work with: Ilia Baldine (RENCI), Rudra Dutta (NCSU), Dan Stevenson (RTI), Anjing Wang (NCSU), Manoj Vellala (NCSU) Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.1

2 Outline Context: The Clean-Slate Debate Motivation: Software Defined Optics SILO Network Architecture: The Story So Far Summary and Future Directions Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.2

3 Context (1) The Internet is broken! Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

4 Context (1) The Internet is broken! (has ossified / reached an impasse) Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

5 Context (1) The Internet is broken! Security is a mess: it is hard to identify users prevent them from causing harm hold them accountable Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

6 Context (1) The Internet is broken! Middleboxes violate end-to-end principle: firewalls NAT proxies Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

7 Context (1) The Internet is broken! Fixed layer architecture is outdated App App App Transport Network Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

8 Context (1) The Internet is broken! Fixed layer architecture is outdated App App App Transport ssh Network Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

9 Context (1) The Internet is broken! Fixed layer architecture is outdated App App App Transport Network MPLS Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

10 Context (1) The Internet is broken! Cross-layer interactions difficult: TCP over wireless App App App Transport Network Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

11 Context (1) The Internet is broken! Clear need for clean-state initiatives NSF FIND, EU FIRE, 1. research in new network architectures 2. large-scale experimental facilities GENI Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.3

12 Context (2) The Internet is doing just fine, thank you! Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.4

13 Context (2) The Internet is doing just fine, thank you! Biological metaphor: mutation and natural selection Evolutionary designs: more robust, less expensive Mid-layer protocols must be conserved not ossified innovation at lower/upper layers of architecture Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.4

14 Context (2) The Internet is doing just fine, thank you! Biological metaphor: mutation and natural selection Evolutionary designs: more robust, less expensive Mid-layer protocols must be conserved not ossified innovation at lower/upper layers of architecture Evolution beats revolution Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.4

15 Our View Internet architecture successful in accommodating change Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.5

16 Our View Internet architecture successful in accommodating change But: current practice of patches/tweaks cannot continue forever Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.5

17 Our View Internet architecture successful in accommodating change But: current practice of patches/tweaks cannot continue forever New architecture must be designed for adaptability/evolvability Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.5

18 Our View Internet architecture successful in accommodating change But: current practice of patches/tweaks cannot continue forever New architecture must be designed for adaptability/evolvability SILO objective: Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.5

19 Our View Internet architecture successful in accommodating change But: current practice of patches/tweaks cannot continue forever New architecture must be designed for adaptability/evolvability SILO objective: The goal is not to design the next system, or the best next system, but rather a system that can sustain continuing change Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.5

20 OBS And The Layer Stack Where does OBS fit in the stack? Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.6

21 OBS And The Layer Stack App App App Transport Network? Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.6

22 OBS And The Layer Stack App App App Transport Network Data Link? Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.6

23 OBS And The Layer Stack App App App Transport Network MPLS? Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.6

24 OBS And The Layer Stack App App App Transport Network OBS MPLS Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.6

25 Cross-Layer Interactions: TCP Over OBS Does TCP Over OBS make sense? Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.7

26 Cross-Layer Interactions: TCP Over OBS Does TCP Over OBS make sense? Yes! TCP carries 95% of Internet traffic good understanding of TCP performance is crucial Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.7

27 Cross-Layer Interactions: TCP Over OBS Does TCP Over OBS make sense? No! App App App which TCP flavor? which OBS flavor? transport and OBS layers must be optimized for each other Transport Network OBS MPLS Data Link not as straightforward TCP over wireless as Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.7

28 Software Defined Optics Optical substrate can no longer be viewed as black box Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.8

29 Software Defined Optics Optical substrate can no longer be viewed as black box Collection of intelligent and programmable resources: Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.8

30 Software Defined Optics Optical substrate can no longer be viewed as black box Collection of intelligent and programmable resources: optical monitoring, sensing mechanisms amplifiers, impairment compensation devices tunable optical splitters configurable add-drop programmable mux-demux (e.g., adjust band size) adjustable slot size Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.8

31 Cross-Layer Interactions App App App Impairment-aware routing Traffic grooming Network resiliency Transport Network Data Link Physical Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.9

32 SILO Architecture Highlights Generalizes traditional layer stack: services: building blocks of fine-grain functionality silo: per-flow vertical composition of services decoupling of layers and services Enables inter-layer interactions: knobs: explicit control interfaces Facilitates introduction of new services: ontology: describes services and their relationships composition algorithm to construct silos standard ontology languages and reasoning engines may be used data interface Service knobs Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.10

33 SILOs Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.11

34 Ontology s 2 service s 1 m m 1,1 1,2 s 5 s m 4 4,1 application s 3 m m 1,1 3,1 m 1,2 m 2,1 m control agent 3,2 m2,2 m m 4,1 3,1 s 6 m 3,1 m 5,2 m 6,3 silos policies m m 6,1 6,1 physical layer method Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.12

35 Ontology Networking Knowledge Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.13

36 Service Composition Constraints on composing services A and B: A requires B A forbids B A must be above (below) B A must be immediately above (below) B Negations, AND, OR Minimal set: Requires, Above, ImmAbove, NotImmAbove All pairwise condition sets realizable Forbids = (A above B) AND (B above A) Above = NOT Below Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.14

37 Composition Problem Given: a set of essential services application Obtain a valid ordering of these and additional services or, identify conflicts with constraints Simple composition algorithm Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.15

38 SILO Software Prototype Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.16

39 Summary Vision enable flexibility, evolution: design for change fine-grain, reusable services, explicit control interface enables experimentation, flexibility, community of innovation per-flow service composition (silos) ease of evolution, policies Framework provide architectural support to vision: constrained composition commoditize cross-layer interaction / optimization Ongoing efforts: extend the prototype new research directions: software defined optics, virtualzation influence GENI development efforts Net SILOs: A New Network Architecture ONDM 2008, March 13, 2008 p.17