Transcript Emulation of Differentiated Services in VNUML

Emulation of Differentiated
Services in VNUML
CS680 Class Project
Course Instructor : Prof. Anirudha Sahoo
Project Team members :
Vijay Gabale (07305004)
Sagar Bijwe (07305023)
Manish Kumar (07405701)
Agenda
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Motivation
Network set up in VNUML
Architecture
Implementation details
Demo
Experiments and Results
Observations
Future scope and Conclusion
Motivation
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Implementation of theoretical concepts into
practice
Get hands dirty with scheduling, token
bucket, IP address prefix matching schemes
Interesting questions
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What is order of improvement achieved by DS
enabled service in terms of delay, jitter and
throughput?
How do real time flows behave in DS enabled
network?
Architecture
Classification
Marking
Drop Priority
Client
Network
Router
Core Network
Boundary
Router
Client B
Client A
Core Network
Core
Router
Client
Network
Router
Scheduling
Forwarding
Classification – Multi-Trie Approach
dst
0
9
1
F1
F2
F3
0
0
0
src
0
1
9
Destination trie
0
1
9
Source trie
F1
F2
F3
Drop Priority – Dual Token Bucket
Two-Rate Three-Color Marker
red
yellow
PIR/PBS
Token bucket P
CIR/CBS
Token bucket C
green
Experimental Set Up in VNUML
client
client
Boundary Router
Customer Network
Customer Network
Forwarding Router
Core Network
Server
What is delay improvement?
Delay decreases considerably in DS enabled network for EF flow.
What is jitter varying?
Jitter for DS enabled flow remains fairly constant.
How is throughput varying for two
flows?
Throughput for DS enabled flow was greater than disable flow.
What is the number of packets
delivered for two flows?
EF flow gets priority in terms of packet scheduling and delivery.
What is number of packets dropped
for two flows?
EF flow gets priority in terms of packet scheduling and delivery.
What is the effect of weight given to classes?
(delay)
Flow with more weight has lesser delay in DS enabled network.
What is the effect of weight given to classes?
(throughput)
Flow with more weight has more throughput in DS enabled network.
Observation
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The service given to one of two real time flows (EF) in the
experiment was quite predictable. This is also in accordance
with that DiffServ does not guarantee any end to end delay but
provides sufficient resources to have improvement as
compared to other flows.
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As we increased the token generation rate of one of the flows,
more number of packets of the flow got admitted which in turn
resulted lower number of packets getting dropped, lesser delay
and higher throughput.
Conclusion
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DiffServ improves the performance of real time
flows. (about 25% increase in terms of delay
and throughput)
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The token bucket parameters, if set
appropriately, are helpful in admission control.
References
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“An Architecture for Differentiated Services” RFC 2475
“Virtual Network User Mode Linux” “http://www.dit.upm.es/vnumlwiki/”