Xu Chen, Z. Morley Mao, Jacobus Van der Merwe University of Michigan, AT&T Labs – Research

Presenter: Xu Chen
http://www-personal.umich.edu.edu/~chenxu

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  Growth demand

  New service technologies

  New operational tools and procedures

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  Any change has potential negative impact

◦  Modern networks are shared in nature

◦  Number of services increases over time rather than diminishes

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  “National footprint” network/platform/testbed for research and network service testing

◦  Service testing/trials in a realistic environment

◦  Evaluation of new technologies/vendor capabilities

◦  Evolution of network support systems

◦  Research in operational settings

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VMM

Physical resource

VM

VM

VM

…

  Connected to, but separate from production network

  In between lab and production   General-purpose, shareable testbed facility

  Overview   Motivating example   Architecture   Implementation   Evaluation   Conclusion

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AT&T

CDN
Node

CDN
Node

Eyeball

Eyeball ISP

ISP

A P

Route
Controller

B

P

P:A P:B

P:A P:B Incoming

Traffic Load

Server load

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ShadowNet EmuLab PlanetLab VINI Production-grade devices Y N N N

Realistic workloads Y N Y Y High-capacity backbone Y N N Y

Geographical coverage Y N Y Y

Dynamic reconfiguration Y N N N

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  Overview   Motivating example   Architecture   Implementation   Evaluation   Conclusion

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  From AT&T backbone point of view ShadowNet looks like just another customer ◦  VPN service provides dedicated internal connectivity ◦  Internet service

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AT&T backbone

ShadowNet Node

ShadowNet Node

ShadowNet Node

PE PE

PE CE

CE

CE

VRF

VRF

VRF

Internet Internet

Internet

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ShadowNet Node

ShadowNet Node

ShadowNet Node

AT&T

ShadowNet Backbone

Peering Links Peering

Links

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User access

User Design

Slice Specification

Physical Instantiation

Persistent
States

Instantiate

Modification

Apply states

Deactivate

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$SL = AddUsrSlice(); $R1 = AddUsrRouter($SL,”LA"); $M1 = AddUsrMachine($SL,”LA","Debian"); $L1 = AddUsrLink($M1,$R1); # similar for M2 $L2 = AddToInternet($R1, "141.212.111.0/24"); # similar for "NY"

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User-level API

User-level manager

Physical-level manager

Device monitor

Configuration Effector

Physical devices

Physical-level API

User slices -  Specification -  Persistent state

Physical resources -  Static -  Dynamic -  Allocation

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Physical Server 1

Juniper Router 1

Physical Server 2

Juniper Router 2

Head

Switch Internet Internet

VPN VPN ISP

Head

Switch

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VM1 LR1

LR3 VM3

eth1

ge-0/1/0

eth1.3

eth1.1

Vlan3

Vlan1 VM2

VM4

eth1

eth1.4

eth1.2 LR2

LR4

ge-0/1/0

Vlan2

Vlan2

CsC CsC

ShadowNet Node 1 ShadowNet Node 2

PE

PE

PE

VRF

VRF

VRF

P

PE PE

PE

Peering link

PE

PE PE

P

Peering link

P

PE

PE

PE

Peering link

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  Overview   Motivating example   Architecture   Implementation   Evaluation   Conclusion

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  Node setup ◦  Two Juniper M7i routers, running Junos 9.0 ◦  One Cisco C2960 switch ◦  Four HP DL520 servers, running Debian

  Backbone ◦  Two Cisco 7206 routers, with MPLS/VPN support

  Four-node wide-area deployment is (still) undergoing!

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  Endpoints (Routers/Machines) ◦  Logical router (Juniper) ◦  Virtual machine (VirtualBox or Xen)

  Connectivity ◦  Linux tap interface/bridge ◦  VLAN ◦  Carrier-supporting-carrier VPN   Layer-2 VPN (pseudo-wire)   VPLS (wide-area switch)

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  Overview   Motivating example   Architecture   Implementation   Evaluation   Conclusion

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Controller monitors health of hardware - Detect failure - Dynamically “replace” physical instantiation

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  ShadowNet ◦  Production-grade service testing platform ◦  In between existing testbeds and production

environment

  Future work ◦  Platform for evolving network control/management ◦  Sneak into production network management

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