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Protocol stacks in control Sam Michiels Dept. of Computer Science. G. B. S. scheduler strategy. Problem context. Research relevance. Protocol stack problems & characteristics Poor separation of concerns Poor customizability Poor reusability Unpredictable load conditions. - PowerPoint PPT Presentation
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AcknowledgementsThis research was funded by IWT.
Further informationSam MichielsK.U.Leuven – Dept. ComputerwetenschappenDistriNet Research GroupCelestijnenlaan 200A3001 Leuven (Heverlee), [email protected]
Supervisors: Pierre Verbaeten Wouter JoosenTel.: +32 16 32 70 68Fax: +32 16 32 79 96www.cs.kuleuven.ac.be
Problem context Research relevance
DiPS+ Strategy
Gold users Silver
usersBronze users
I II III
I II III
I II III
In = 30 r/s
In = 30 r/s
In = 30 r/s
In = 30 r/s
In = 60 r/s
In = 30 r/s
In = 60 r/s
In = 30 r/sIn = 30 r/s
Non DiPS+ RADIUS randomly drops packets
DiPS+ server protects itself against overload
(self-healing)
In = 30 r/sOut = 30 r/s
In = 30 r/sOut = 20 r/s
In = 300 r/sOut = 200 r/s
In = 200 r/sOut = 200 r/s
Authentication requests
Authentication requests
Accounting requests
Accounting requests
UDP/IP protocol stackUDP/IP protocol stack
RADIUS accountingRADIUS authentication
G S B
schedulerstrategy
•Protocol stack problems & characteristics
•Poor separation of concerns
•Poor customizability
•Poor reusability
•Unpredictable load conditions
•Protocol stack development productivity must increase
•Growing demand for application-specific customizations
•Customizable protocol stacks require powerful software design concepts
Distrinet Protocol Stack component framework
Protocol stacksin control
Sam MichielsDept. of Computer Science
Research results
Functional/concurrency/dispatching components
Separate data & management plane
Software architecture(pipe & filter, blackboard, layered)
Self-healing system behavior(e.g. load management)
Headerparser
Concurrencycomponent
DC
Attributeparser
NASchecker
AuthenticatorAccept replypreparatorReject replypreparator
Attributeconstructor
Headerconstructor
Headerparser
Attributeparser
NASchecker
Headerconstructor
Attributeconstructor
Acct replypreparator
AccounterAcctReqAut
hchecker
Concurrencycomponent
