Transcript CHEETAH - University of Virginia

CHEETAH – a high speed
optical network
Xiuduan Fang, Tao Li, Mark
Eric McGinley, Xiangfei Zhu,
and Malathi Veeraraghavan
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How does today's Internet work?
Abilene: Backbone network of Internet 2
Internet2: Universities + Research Laboratories
From http://abilene.internet2.edu/maps-lists/
• Regular mail: Letters are
sent in envelopes and routed
from post-office to postoffice, with each post-office
examining the address on
the envelope to determine
the next post-office to
which the letter should be
forwarded
• Internet: Your email
messages, for example, are
broken up into small packets.
Each packet carries the
destination address in a
header. Each router
extracts the address from
the header, and determines
the next-hop router to which
to forward the packet.
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What does a router look like?
A typical packet
Header
Part of a user message
Header contains
source and
destination addresses
Example: A Cisco GSR 12008 router
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Internet's bandwidth sharing mechanism
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Today's Internet operates in a reservationless mode
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A computer is not required to reserve bandwidth before
sending packets from an application, such as email
Consequence: congestion can result if many users'
simultaneously send emails or access the web.
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Packets can be delayed excessively, or even dropped by routers!
Analogy: The roadways network; convenient, efficient usage, but a
driver could be held up in traffic jams
Sender
Receiver
1
2
3
4
Second delay
First delay
1
t
2
4
t
Second delay >> First delay
Packet 3 was dropped because
of other users' packets competing
for "road space"
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A new bandwidth-sharing mechanism
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Reservation-oriented bandwidth sharing
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User application signals its required data rate to the network
The network reserves this rate, if available, on each link of the
end-to-end path
Consequence: If a user request is admitted, service quality is
excellent; no unpredictable delays or losses
Analogy: Airline travel; a user reserves a seat on each flight of
a multi-flight trip before starting the trip
We are building high-speed optical networks using this
mode of bandwidth-sharing
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Building block: reservation-capable switches
Example Cisco 15454
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CHEETAH: Circuit-switched High-speed
End-to-End Transport Architecture
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CHEETAH
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Sponsored by National Science Foundation (NSF) and the
Department of Energy (DOE);
Built to support scientific research projects, such as the Terascale
Supernova Initiative (TSI)
TSI
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Sponsored by the DOE
Study the explosion mechanism of supernovae
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rare in our galaxy
need computer simulations to understand this mechanism
Enabling technology: TeraScale computing resources
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Example: The Crab Nebula, remnant of SN 1054
supernova
• Core collapse supernovae: the most
energetic explosions in the Universe
• Scientists need to study explosion
mechanism and understand observables
• Technology used: Large-scale, multidimensional computer simulations
conducted by supercomputers
• Simulation generates huge amount of
data at terabyte (1012) scale or even
larger, which needs to be further
processed by scientists’ computers
The picture: one of the largest ever image taken by the Hubble Space Telescope,
obtained from http://en.wikipedia.org/wiki/SN_1054
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Problem: How to move simulation data
Move data through Internet?
Cray XT3
Supercomputer
Scientist
Picture obtained from http://www.science.doe.gov/National_Laboratories/index.htm
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Application of CHEETAH Network
NYC
HOPI
Force10
UVa
Internet
H
Mvstu6
152.48.249.106
UVa
Catalyst
4948
1G
WASH
HOPI
Force10
NCSU
Prof. John Blondin
2x1G
MPLS tunnels
NCSU
M20
Orbitty Cluster
1G
1GFC
UCNS
Oak Ridge
National Lab
3x1G VLAN
OC192
GbE
1G
GbE
Zelda4 10.0.0.14 H
Zelda5 10.0.0.15 H
1-8-33
1-8-34
1-6-1 1-7-1
1-8-35
1-8-36
1-8-37
1-6-17 1-7-17
1-8-38
10GbE OC192
1-7-33
1-7-34
1-7-35 1-7-1 1-8-1
1-7-36
1G
Juniper
T320
1G
1G
1G
1G
MCNC
Catalyst
6500
1G
1-8-39
Cheetah-ornl
OC-192 lamda
H Wuneng 152.48.249.103
cheetah-nc
Raleigh
Atlanta
Zelda1 10.0.0.11 H
Zelda2 10.0.0.12 H
Zelda3 10.0.0.13 H
1G
1G
1G
1G
Juniper
T320
H
cuny-h1
cuny-h2
134.74.17.112 134.74.17.113
WASH
Abilene
T640
CUNY
1G
1G
1G
1G
H
1G
Wukong 152.48.249.102 H
OC192
1G
1G
Centuar
FastIron
FESX448
H
Force10
E300
switch
CUNY
Foundry
1G
1. Reserve
bandwidth
2. Move the
terabyte sized
files
OC-192 lamda
GbE
10GbE OC192
1-7-33
1-7-34
1-7-35
1-6-1
1-7-36
1-7-1
1-7-37
1-7-38
1-6-17
1-7-39
Cheetah-atl
Direct fibers
VLANs
MPLS tunnels
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Demo introduction
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Data being moved from Cray to Orbitty are
large files
For visual effects, we use video instead to
illustrate the benefits of reservation-oriented
networks
Two scenarios
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Small data rate with interfering traffic
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Emulates popular webcam experience
Higher data rates without interfering traffic
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Much better video quality
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Demo Setup
SONY SNC-RZ30N
Network camera
192.168.2.111
Interfering traffic
192.168.2.1
100Mbps
Ethernet
switch
Emulates congested
Internet path
192.168.10.1 192.168.10.2 192.168.3.1
192.168.3.2
Router #1
(Cisco GSR)
Router #2
(Cisco GSR)
192.168.2.3
100Mbps Ethernet
interface card
Cisco 15454
MSPP
Emulates dedicated
CHEETAH circuit
OC-3 interface card
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