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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Real-Time Visualization of IP
Streams Over Switched WANs
Timothy J. Salo
Network Computing Services, Inc.
[email protected]
[email protected]
http://www.msci.magic.net/visualization
Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Contents
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Our objectives
Our real-time visualization tool
Our offer
Our research (time permitting)
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Overview
• DARPA-funded research project to explore
the behavior of IP protocols in switched
environments (particularly in WANs)
• We believe that the mapping of IP streams
onto a collection of switched connections is
an important, general problem
• We have developed a real-time visualization
tool
• We are looking for places to deploy the tool
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Overview
• We observed apparent anomalies in MAGIC
wide-area IP/ATM testbed
• Anomalies appeared related to the protocols
that map IP streams onto underlying switched
connections (ATM SVCs)
• We wanted a real-time, global, fine-grained
view of the behavior of IP and the underlying
switched connections
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Origins
• We wanted a real-time view of the network
Demo
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Displays graphically, in real-time, IP-related
streams in wide-area IP/ATM internets
• Focuses on mapping of IP streams onto
switched connections
• Allows researchers to interactively control the
visualization
• Allows researchers to store and replay data
• Initially, supports IP/ATM
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Completely written in Java
– Compiles under Java 1.1
– Works better under Java 1.2
– Will be released with Berkeley-style copyright
• Object-oriented design
– UML description of class hierarchy
• JavaDoc documentation
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
Live, prerecorded
or animated
visualizations
Visualization
Subsystem
Animations
Live or
Prerecorded Data
IP/ATM
WAN Under
Observation
6/13/00
SNMP
Data Collection
and Analysis
Subsystem
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Composed of two components
– Data collection and analysis subsystem
– Visualization subsystem
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Data collection and analysis subsystem
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6/13/00
Extracts data from the network using SNMP
“Auto-discovers” network topology
Creates a model of the network topology/state
Updates the model as the network state changes
Sends “model updates” to the visualization
subsystem
• serialized Java objects
• complete model can be created from updates
• model updates can be written to file
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Visualization subsystem
– Runs as an applet or an application
– Receives model updates from the data collection
and analysis subsystem (or a file)
– Maintains a model of the network topology/state
– Displays the state of the network under operator
control
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
The Visualization Tool
• Visualization system running on small
networks
• Less information in MIBs than expected
– Standard MIBs not always implemented
– MIB often designed to expose variables, not
support operations or research
• We want to deploy this on larger networks
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Visualization Demo
• University LAN Demo
• Internal LAN Demo
• Local Demo
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Offer
• We are looking for moderate-sized
networks on which to deploy our tool!
– Wide-area networks or campus networks
– IP over ATM
– Perhaps, MPLS
• We will:
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6/13/00
Install and operate the tool
Put a person on site, if necessary
Add support for your switch vendor’s MIBs
Extend the software, time permitting
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
More Information
•http://www.msci.magic.net/visualization/
•[email protected]
Credit
This work is sponsored by the Defense Advanced Research
Projects Agency (DARPA) under contract number
F30602-98-C-0211.
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Terminology
• stream an aggregate of one or more flows,
treated as one flow for the purpose of
forwarding in L2 and/or L3 nodes
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Research
• We believe that making IP protocols work
gracefully over switched connections is a
general problem
• Switched connections are ubiquitous
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6/13/00
IP/ATM (Classical IP, LANE, NHRP MPOA)
MPLS
Tunnels (Mobile IP)
Reservations (RSVP)
Wavelengths
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Research
• Many IP protocols don’t work well with
switched connections
– Routing protocols (rapid topology changes)
• Compare process of installing a new leased
line with establishing a switched connection
– Adding a leased line involves lots of manual
processes and time (~100 days)
– Adding a switched connection (in some sense)
compresses all of this work into 100 msec
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Research
• Where can things go wrong in IP over
switched services WANs?
– Maintaining a collection of connections
• Stability
• Why is there a connection between these
nodes? Why not one here?
• Response to resource depletion
– Assigning flows to connections
• Why do packets take that path?
– Behavior of IP/switched-services “control” traffic
versus data
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Research
• Our model of IP-over-switched-services
protocols includes four functions:
– Maintain a collection of connections
• Connections may be provided by an underlying
link-layer network
• Connections maintained by IP software
– Maintain routing tables for switched connections
– Classify packets into streams
– Assign streams to switched connections
• We believe this model has general applicability
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Our Research
• Problems can be introduced at:
– Network configuration time
– Protocol design time
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Religious Issues
• ATM, virtual circuits, traffic engineering, …
easily generate a lot of discussion
• I believe that interactions between switched
connections and the IP protocols include
most of the interesting issues in this area
• I believe that many IP protocols don’t work
well with switched connections
– Routing protocols (rapid topology changes)
– Traffic engineering (automated network design)
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Religious Issues
• I believe that switched connections are
pervasive in IP networks
– Switched link-layer services
– Within IP protocols
• Mobile IP, MPLS, VPNs, …
• ATM is not the issue
– Use ATM when it is cost effective [and works] –
nothing more needs to be said
– The cost characteristics of ATM have clearly
altered the technical and political evolution of the
Internet
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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Real-Time Visualization of IP Streams over Switched WANs
Network Computing Services, Inc.
Religious Issues
• “Virtual circuits” are not the issue
– I don’t think I can really define a virtual circuit
anymore…
– Should we avoid frame relay because it uses
“virtual circuits”?
– Unknown or variable bandwidth might be an issue,
but it’s not a major issue
6/13/00
Copyright ©2000 Network Computing Services, Inc.
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