Distributed Policy-based Management of Measurement-

based Traffic Engineering

Steven Van den Berghe

IMEC / Ghent University (Intec)

outline

draft-ietf-tewg-measure

Measurement-basedTunnel management

2000

2002

2004

?

Tequila (http://www.ist-tequila.org)

SLS management

Traffic Engineering

Data Plane

Monitoring

Policy Management

PolicyConsumer

Pol. Mgttool

SLS Subs

SLS invoc.

TrafficForecast

DRsM

DRtM

MPLSTC

ND

SLS Repos.

PHB

Tequila (http://www.ist-tequila.org)

SLS management Traffic

Engineering

Data PlaneMonitoring

Policy Management

USER

SLSDemand

Resources

Status Feedback

Configuration

Resource Provisioning

2-level TE

DiffServ / MPLS config

Admission Control

Path Selection

SLSsubscription

Demand Forecast

SLSInvocation

InjectedTraffic

Requirements Feedback Mechanism

Operating in Multipath / Multiclass environment (DiffServ over MPLS)Large set of possible metrics One way Loss, delay, offered load

Sollicited / Unsollicited report triggering Regular status updates If (delay>x) then trigger

Need for measurement architecture

Enduser-to-Enduser

Core

Customer Customer ISP Aggregate Flow

B C

B

C

C

C

C

Ingress-to-Egress

Where / How to Measure

Active MeasurementEndpoints

Passive Measurementpoint

Scalability/Multipath IssueEvery ingress 2 every egress 4 every CoSNo single path => no single measurement

result

Complexity IssueNew measurement functions needed in every node

Could also be an

ISP

Trust IssueIsn’t nobody touching my injected packets

Not for TE

SLS Monitor

Network Monitor

Measurements For TE: tequila approach

I C E

Node Monitor

Node Monitor

Node Monitor

AM AM

PM

PM

PM

AM

SLS scope

(Link,PHB) scope (Link,PHB) scope

What to Measure

Service Level Agreement (SLA)Transport Service

Service Level Specification (SLS)

QoS class / PathPer Domain Behaviour (PDB)

Per Hop Behaviour (PHB)Traffic Conditioning Block

Scheduler (e.g. WFQ)Algorithmic Dropper (e.g. RED)

Throughput Monitoring

End-to-End delay/lossLSP stats

Per Hop Delay/Loss/Queue

stats

Down at the wire

Edge

Classifier

Classifier

Conditioning

Classifier

Edge

SelectionDecision

Classifier

Core

LSP Group

LSP

LSP

Queue LossOffered Load

LSP Offered Load

ClassifiedLoad

Conditioning Loss

LSP Throughput

ClassifiedLoad

Active Measurement Loss/DelayHow do I manage

all of this ?

Measurement-Based Tunnel Management

2-Level Traffic Engineering High-level multipath balancing &

DiffServ provisioning Low-level Path Selection based on

accurate network status

TunnelManagement

DiffServManagement

Uniform MeasurementManagement

TunnelManagement

Uniform MeasurementManagement

Case study: Level 2 Tunnel Management

TunnelManager

Evaluator

Monitor

If signal then switch traffic to Path with less problems

hx

hxllh

lxlx

xp

1

0

)(h

l

Signal:

Impact of Read-Out Periods

0

0.5

1

1.5

2

2.5

11 users 13 users 15 users

Loss

(%

)

Simulation Readout 0.25

Simulation Readout 0.5

Simulation Readout 1

Simulation Readout 2.5

TunnelManager

Monitor

Evaluator

RSVP-TE

Active vs. Passive

0

10

20

30

40

50

60

70

80

90

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34Time (read-out 1 second)

Loss (%)

Passive Active Probe Every 0.2

Active Probe Every 0.5 Active Probe Every 0.7

20 applicationsstarted & buffers

full

Active loss measurements

Long RO needed to be accurate

Long RO-> less responsive

Try to Avoid Active Measurements

What’s Next

TunnelManagement ‘Tunnel’ creation,

maintenance & traffic mapping

Regardless of technologyRegardless of application

MPLSIPsecP2PGrid

TunnelSet-up

TunnelMonitoring

TunnelMapping

What’s Next

TunnelManagement

Uniform MeasurementManagement

Uniform access to measurements & reporting

Regardless of technologyRegardless of application

Next to TE: DoS, network diagnostics, accounting,….

Resource control

Aggregation close to the wire (~high speed links)

Security

Thank You

Any Questions ?

steven.vandenberghe@intec.rug.ac.be

http://www.ist-tequila.org

http://www.ist-scampi.org

http://www.ietf.org/internet-drafts/

draft-ietf-tewg-measure-02.txt