ITU-T Workshop on IP/OpticalChitose, 9-11 July 2002

Session 11 -- Network Performance

Neal Seitz, Chair SG 13/WP 4

• IP Performance Specifications: Progress and Next Steps

-- Al Morton, AT&T (SGs 13, 12, IETF)• Relating Optical Layer and IP Client Performance

-- Peter Huckett, Acterna (SGs 4, 13, 15, TMForum)• IP/Optical Network Performance Management

--Tobey Trygar, Telcordia (SGs 15, 4, TMForum)

IP/Optical Networks: Motivation• Infrastructure Attributes

– Optical core, IP router clients, IP end users

– All types of application data carried in IP packets

– MPLS based network management and control

• Essential Capabilities– Dynamic resource reservation

– Multi-layer traffic engineering

– Automatic protection switching, path restoration

• Operational Benefits– Lower network deployment and management costs

– Faster optical path provisioning and restoral

– Enhanced service creation, new applications

IP/Optical Networks:Performance Benefits and Challenges

• Performance Benefits– Increased (and more reconfigurable) transmission capacity

– Reduced packet transfer delay, delay variation, loss, error

– Lower “call” set up delays and blocking probabilities

– Improved service availability

• Performance Challenges– Define ASON/OTN performance parameters and

objectives

– Relate ASON/OTN and IP network performance measures

– Specify interoperable performance signaling protocols

– Relate IP user/client requirements with control mechanisms

– Define compatible network management strategies

OCh

OMS

OTS

OCh

OMS

OTS

IP LAYER

LINK LAYER

PHYSICAL LAYER

IP LAYER

LINK LAYER

PHYSICAL LAYER

OPTIC

AL LAYER P

ERFORM

ANCE ?

IP LAYER PERFORMANCE (Y.1540, Y.1541)

IP ROUTER NETWORK IP ROUTER NETWORKOTN

OPTICAL CONTROL AND

MANAGEMENT PLANE

IP CONTROL AND

MANAGEMENT PLANE

IP CONTROL AND

MANAGEMENT PLANE

PROTOCOLS ?PROTOCOLS ? PROTOCOLS ?

RELATIONSHIPS ?

Combined Protocol Layer and Technology Domain Views(and Some Performance Management Issues to be Resolved)

? ?

Primary Performance Parameters

Primary Performance Parameters

Access

Transfer

Disengagement

Speed Accuracy DependabilityFunction

Criterion

(Decision Parameters)

Available Unavailable

Availabilit

y Paramete

rs

User Network

(Parameter Defining Reference Events)

User NINI

Traditional SG 13/WP 4 Performance Model

Performance Parameters?

Performance Parameters?

Available Unavailable

Availabilit

y Paramete

rs?(Decision Parameters?)

Application in Defining Optical Network Performance

IP User IP User

SwitchedOptical“Core”Network

(Reference Events?)

NI?NI?IP

Router“Client”Network

IP Router

“Client”Network

Possible Discussion Topics: IP Performance Specifications

• Performance Parameters, Objectives, and QoS Classes– Current IP network applications (FTP, e-mail, browsing,

…)

– Planned real-time services (VoIP, video conferencing, …)

– New applications enabled by IP/Optical infrastructures

• Allocation of Performance Limits Among Providers• Performance Monitoring (In and Out of Service)• Mechanisms for Providing Assured-Quality Services• Localization of IP Network Failures

Possible Discussion Topics: Relating Optical Layer

and IP Client Performance

• Performance Model for ASON/IP Client Interactions– Interfaces, reference events, functions, parameters

– Service classes, service level agreements (SLAs)

• Allocation of Performance Limits Among Providers• Performance Monitoring (In and Out of Service)• Mechanisms for Providing Assured-Quality Services• Localization of Optical Network Failures

Possible Discussion Topics: Performance Management and Interworking

• Alternative Views of a Service Delivery Network– Layered protocol/transmission signal view

– Network domain view (technology, jurisdiction, routing)

• Mechanisms for Performance (and Capacity) Control – Between IP end users and “client” IP router networks

– Between IP clients and switched optical core networks

– Among layers within IP and optical technology domains

• Performance Management Interworking Among Layers– Performance monitoring, failure localization

– Protection, restoration, OAM&P

Network Performance (IP/Optical) Session Plan

Topic Time

Introduction 10 minutes

3 Presentations 60

Open Discussion 15

Wrap Up, Action Items 5

90 minutes