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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
On the Optimal Configuration of Metro Ethernet
for Triple Play
András Kern, Tibor Cinkler, István Moldován
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Triple-Play in Metro Ethernet Network
» Three different services on a single infrastructure
» High Speed Internet (HSI)
» Voice over IP (VoIP)
» Video service (IPTV, iVoD)
Video
VoD
Head End
Edge node
Switch
Data
Switch
Switch
TV + Set Top Box
Home Gateway
Access Node
VoIP
Switch
Edge node
GW
Customers’ Home Net.
Local Access / First mile
Metropolitan Network
Service Providers’ Networks
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Ethernet in Metro Networks
Metro Access
TALK / DATA
TALK
1
2
3
4
5
6
7
8
9
*
8
#
RS CS TR RD TD CD
Cable
Modem
Home Network
Metro Core
Access Multiplexer Switch
First Mile
Switch
Switch
Switch
Edge node
Metro Network
»
Ethernet is the most dominating LAN technology
» Cheap equipment + high speed (up to 10 Gbps)
»
Introduce Ethernet into the Metro network (Metro Ethernet Forum):
Core
» consistent network platform
»
Ethernet should be Carrier Grade:
»
»
»
»
»
Traffic and User separation ~ Virtual LANs
QoS ~ 8 traffic classes
Reliability ~ Rapid Spanning Tree Protocol
Scalability ~ MAC-in-MAC and Q-in-Q
Operation, Administration Management
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Routing in Ethernet: Spanning Trees Protocols (STP)
» Spanning Trees form loop-free logical topologies
» Their shape influenced by Port Costs
» Provide restoration
Root I.
» MORE VLAN based spanning
Root II.
trees
» Multiple spanning tree
instances
» Each tree runs a separate
Rapid STP instance
Bridge D
Bridge A
Bridge C
Bridge B
Bridge
» 1 VLAN  1 tree
Bridge
Bridge
Bridge
Bridge
»
By default tree spanning is “Topology-Driven”:
» Port costs based on topology and link capacities
»
Costs can be set manually (to obtain desired trees)
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Resource Management Architecture
»
Network Management Entity
TE-pipe
» Runs between access and
edge nodes
» pre-provisioned resources
» Per Service
TE pipe
Telephone
»
AN & EN
» Enforcing traffic via
» Policing
» Shaping
Computer
Access Node
Switch
Switch
TV and
Set Top Box
Edge node
Switch
Modem
Switch
»
Network Management Entity
» Manages the resources
» Performs CAC based on
service datas and QoS.
» Configures network elements
(e.g., SNMP)
Access Node
Switch
e
pip
E
T
Edge node
Switch
Modem
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
QoS Model
» Priority based scheduling:
» Lower priority traffic is not served until there is higher priority traffic
in the queue.
» To ensure low delay for each QoS class:
amount of higher priority traffic should be
limited for each link
» Static global limits are defined for
each class
Class ID
Provided
service
BW ratio
1
VoIP
0.1
2
IPTV
0.2
3
-
-
4
HSI
remaining
» The method of how to determine these limits is out of scope.
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BME - TMIT
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
IPTV: Multicast in Metro Ethernet
» Efficient distribution of Video needs multicast
» Dynamic Multicast
» Ethernet switches “snoops” IGMP messages
» Decides on which ports sends the packet out.
» Manual Filtering
» VLAN are for restricting Broadcast Domains
» Shaping the VLAN to Multicast-trees
» Assumed method
» Forming P2MP Pipes ~ VLANs
» Carrying more MC tree
» IGMP snooping can be also used
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BME - TMIT
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
HSI: Statistical Multiplexing
» Traffic of individual users highly varies
» Considering it at PIPE dimensioning
» Aggregation of these flows still fluctuates
n

» Guèrin's model assumed
BWaggr  mi  
» Variances of Flows have
i 1
to be estimated
» Flows ~ Independents & Normal Distribution
n
2

 i
i 1
» TE pipes are described: (Mean Rate; Peak Rate)
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
On the Optimal Configuration of Metro Ethernet for
Triple Play
Proposed Method and Simulation Results
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Problem Formulation
» Input parameters:
» Topology
» QoS model
» Static Traffic Matrices for each service
» Tree Instances
» The proposed method
» Defines uni/multicast pipes for demands,
» Spans the tree instances and
» Assign the pipes for the tree instances
» Integer Linear Model was presented for the basic problem,
but it does not deals with
» statistical multiplexing
» multicasting
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
10
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Proposed Heuristic Method
» Decomposes the problem to
» Sequential allocation of pipes AND appending them to a tree
instances.
» Demand ordering problem
» In each iteration random selection between:
» Allocation of NEW pipe
» Remove an existing tree
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
11
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Case Study
»
Assumed dual homing based topology
»
Services
» VoIP
» Unicast + symmetric PIPEs
» No statistical mux assumed.
» 10% of total traffic
» Video
» Multicast + asymmetric PIPEs
» Medium traffic variance (PMR ~1.2)
» 30% of total traffic
» HSI
» Unicast + asymmetric PIPEs
» Large traffic variance (PMR ~ 2.0)
» 60% of total traffic
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
12
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Traffic Model
» Demand sizes based on Gaussian distribution
» PEAK rate: Total traffic level x Service Ratio
» MEAN rate: PEAK rate / PMR
» VoIP and HSI : separate PIPEs for each AN—EN pair
» IPTV: 1 multicast PIPE for each EN.
» Performance descriptor: ACHIEVABLE THROUGHPUT
» Determined via binary search of Total traffic level
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
The effects of Statistic Multiplexing
Same throughput
– less resources
20% more
throughput
achieved
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
14
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Notes on scalability
» „OFF-LINE” configuration method
» No strict time constraints
» Scalability still important
» On larger networks
» Perform Dynamic TE
» The proposed method iterative + polynomial steps
» Finds solutions within a minute in the Test Case
» Needs 100 rounds to find the solutions
» For 1000 and 10000 rounds only a slight increase of
performance…
» Recent simulation on larger networks also show its scalability
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
15
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
BME - TMIT
Conclusion
» To provide Triple-Play QoS aware architecture is needed
» To decrease costs Ethernet is a good choice
» We propose
» An efficient algorithm for off-line configuration
» Deals with priority based QoS
» Multicast
» Exploit the effects of Statistical Multiplexing
» Its performance is presented on a test case
2nd EuroNGI Conference on Next Generation Internet Design and Engineering, Valencia, SPAIN
16
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS
Thank you for your attention
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS