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광인터넷 망관리를 위한 주요 이슈. Jun Kyun Choi jkchoi@icu.ac.kr Tel) (042) 866-6122. 목차. Requirements for Next Generation Network Backgrounds for Optical Networking IP over Optical Network Architecture Management Requirements for Optical Internet Generalized MPLS Technology for Optical Internet

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slide1

광인터넷 망관리를 위한 주요 이슈

Jun Kyun Choi

jkchoi@icu.ac.kr

Tel) (042) 866-6122

slide2
목차
  • Requirements for Next Generation Network
  • Backgrounds for Optical Networking
  • IP over Optical Network Architecture
  • Management Requirements for Optical Internet
  • Generalized MPLS Technology for Optical Internet
  • Conclusions
vision of next generation infrastructure
Vision of Next Generation Infrastructure
  • Future network will be built using DWDM and MPLS
    • Long-haul network consist of a meshed network of optical cross-connects by DWDM system. The signaling will be based on MPLambdaS
    • Terabit Router will be deployed at the gateway or super POPs
    • Core Metro Network will be based on DWDM Optical Ring
    • A specialized router functioning as an IP service switch at each POP
    • Last mile consist of various technologies including ADSL, fixed wireless, PON, FTTC.

Packet-enabled

DWDM

Metro/Regional

Network

Packet-enabled

DWDM

Metro/Regional

Network

Wireless (HFR)

Integrated

Access

Network

Integrated

Access

Network

DWDM

Backbone Network

Wireless (HFR)

PON

PON

광선로

광선로

ADSL

ADSL

Cable (HFC)

Cable (HFC)

Access

Metro/Regional

Long haul

Metro/Regional

Access

customers requirements for multi services
Customers Requirements for Multi-Services
  • Security, predictability, and reliability
  • Cost effectiveness and flexibility
  • Applications that work all the time – end to end QoS
  • High reliability for mission critical applications
requirements of next generation infrastructure
Requirements of Next Generation Infrastructure
  • High performance, scalable, efficient network
  • Always-available network (99.999 %)
  • Low cost administration nets
    • Scalable systems (small footprint, low power)
    • Auto provisioning
    • Fast troubleshooting & reaction to problems
    • Fast service activation
    • Up- to- date network knowledge
  • Policy-based management
service provider objectives
Service Provider Objectives
  • Maximize revenue opportunities from optical network investments
    • Create new revenue opportunities, while avoiding the loss of existing revenue streams
  • Efficiency and reduced capital and operational costs through convergence and consolidation
    • Multiple networks create unnecessary duplication of effort and expertise in a single organization
  • Ease and automation of service provisioning
    • Faster and less expensive
backgrounds for optical network
Backgrounds for Optical Network
  • Re-evaluation of traditional network platforms and cost structures
    • Requirements changing on Service delivery and OAM
    • Limitations of existing architecture
      • Existing SONET/SDH ring-based architecture moves to Mesh configuration
      • Optimized for voice, Can’t scale enough for data
  • Utilize dynamic allocation for DWDM network capacity
  • Just-in-time provisioning for Dynamic Re-configurable Optical Network
  • Innovation and advances in optical components and transport technologies
    • Increased focus between electrical and optical devices
dynamic provisioning
Dynamic Provisioning ?
  • Dynamic just in time provisioning
  • Efficient management of network assets
  • Migrating service provisioning responsibilities into the network and offloading the network management systems
  • A variety of protection and restoration options
  • Interoperability across multi-vendor, multi-technology, and multi-domain networks
motivation for optical networking
Motivation for Optical Networking
  • Cost and Efficiencies
    • Wavelengths cheaper than switching packets
    • Eliminates costly O/E/O conversions and equipments
  • Flexibility and Management
    • Just-in-time service provisioning ?
    • Traffic engineering at the wave level ?
  • Revenue Opportunities
    • Fast provisioned wave services
    • Bursty IP services through backbone network
toward optical ip network
Toward Optical IP Network
  • Guidelines and Direction
    • Optical bandwidth reduces the cost of IP services
    • Use of Generalized MPLS signaling
    • Desire to have restoration behavior of current SONET network
    • Goal of dynamic optical path service
    • Greater bandwidth efficiency from IP layers
control requirements for optical networking
Control Requirements for Optical Networking
  • Dynamic Reconfiguration of Optical Network
    • Link Protection and restoration, Capacity Planning, performance monitoring, etc.
  • Rapid service provisioning for negotiated bandwidth and QoS
  • Scalability on bandwidth provisioning
  • Grooming of sub-rate circuits
  • Dynamic Optical VPN for multicast according to SLA
  • Automatic configuration and topology auto-discovery
  • Integrated control of L1, L2 and L3 Switching/Routing
separation of control plane from data plane
Separation of Control Plane from Data Plane
  • Separate control and data channels
    • Out of band in fiber, out of band out of fiber
    • Control channel failure might not disrupt data
    • Control plane reboot might not disturb data plane
  • Handling Protection and Repair Conditions
    • Selection of Protection Domains
    • Requirements for Recovery
    • Failure Detection and Reporting
    • Recovery after Node Failure
protocol reference model for optical internet

WDM

Layer

WDM

Layer

WDM

Layer

Optical

Layer

Optical

Layer

Optical

Layer

Protocol Reference Model for Optical Internet

Telecommunication Management Network

Routing and Signalling Network

M-plane

M-plane

M-plane

U-plane

C-plane

U-plane

C-plane

U-plane

C-plane

IP Routing

IP Routing

IP Routing

IP

Signalling

(SIP,etc)

IP

Layer

IP

Signalling

(SIP,etc)

IP

Layer

IP

Signalling

(SIP,etc)

IP

Layer

Traffic, Flow

QoS

Management

Traffic, Flow

QoS

Management

Traffic, Flow

QoS

Management

MPLS

Signalling

MPLS

Signalling

MPLS

Signalling

WDM

Management

WDM

Management

WDM

Management

RWA

Signalling

RWA

Signalling

RWA

Signalling

Optical Link

Management

Optical Link

Management

Optical Link

Management

Core

Router

Edge

Router

Edge

Router

mpls based optical ip network architecture

IP/MPLS Router

IP/MPLS Router

Optical Edge Router

Optical Edge Router

MPLS-Based Optical IP Network Architecture

Customer

Network

IP/MPLS Network

Customer Network

IP/MPLS Router

Optical MPS

Sub-Network

Optical Edge Router

Optical Core Router

Performs label merging/tunneling

to optical lambda LSPs.

Perform Explicit Routing on lightpath LSPs with optical switching fabrics

LSPs within Electronic

MPLS Clouds

Note) LSP: Label Switched Path

service model for optical internet 1 domain service model

IP/MPLS Router

IP/MPLS Router

Service Model for Optical Internet - 1Domain Service Model

Server-Domain

Optical Sub-network

Control & Management Plane

Client-Domain

IP Network

Client-Domain

IP Network

NNI

Optical Node

Controller

NNI

NNI

UNI

UNI

(GMPLS signaling is

not shown at Client)

Signaling exchange

Optical Edge Router

Optical Core Router

Loose Binding

in Optical Path

Data

Transfer

Optical Path

User Plane

Optical Node

Optical Node

Optical Node

Note) UNI: User to Network Interface NNI: Network to Network Interface

MPLS: Multi-Protocol Label Switching GMPLS: Generalized MPLS

service model for optical internet 2
Service Model for Optical Internet - 2
  • Domain Services Model
    • Clients access to optical network using well defined UNI
    • Client/Server domain relationship
      • IP is a client of the optical domain
      • Optical layer provides point-to-point channels for clients
    • Optical/transport paths requested by clients and setup dynamically within optical network. Path setup method unspecified
    • For router network clients, optical paths are used as point-to-point IP links
    • For TDM clients, optical paths are large structured, fixed bandwidth paths
service model for optical internet 3 unified service model

IP/MPLS Router

IP/MPLS Router

Service Model for Optical Internet - 3Unified Service Model

Optical Sub-network for Control Plane

Control & Management Plane

IP/MPLS Network

IP/MPLS Network

NNI

UNI

Optical Node

Controller

NNI

NNI

UNI

Common Signaling

based on GMPLS

Optical Edge Router

Optical Core Router

Tight Binding

in Optical LSP

Optical LSP

User Plane

Data

Transfer

with label information

Optical Node

Optical Node

Optical Node

Note) UNI: User to Network Interface

NNI: Network to Network Interface

MPLS: Multi-Protocol Label Switching

GMPLS: Generalized MPLS

LSP: Label Switched Path

Optical Sub-network

service model for optical internet 4
Service Model for Optical Internet - 4
  • Unified Service Model
    • A single control plane for User and Optical Network Node
      • single signaling and routing protocol
    • MPS-based optical network using label binding by Clients
      • IP router’s FEC is matching to Optical LSP
    • IP signaling and routing protocols need to be modified to support optical characteristics
    • No UNI, Client use NNI directly
network architecture model
Network Architecture Model
  • Overlay Model
    • Separate routing of IP and Optical layer
    • Separate the control plane between Optical Transport Network (OTN) domains and IP domains
    • Augmented routing can be applied
  • Peer Model
    • Integrated signaling and routing of IP layer and Optical layer
    • Same control plane in the OTN and IP domains
overlay model

IP/MPLS Router

NNI

NNI

Overlay Model

Core IP/MPLS Network

IP/MPLS Router

IP/MPLS Router

IP/MPLS Router

Customer

IP/MPLS Network

UNI or Proprietary

UNI or Proprietary

Optical C-/M-plane for Signaling & Routing

Optical U-Plane for Data Transfer

Signaling exchange

UNI

OXC

NNI

OXC

Optical

Cross-Connect (OXC)

Data

Transfer

OXC

Optical Sub-network

peer integrated model

IP/MPLS Router

IP/MPLS Router

NNI

Peer/Integrated Model

Optical C-/M-Plane for Signaling & Routing

Optical U-Plane for Data Transfer

Single IP layer driven control plane

for both IP and optical layer

Customer

IP/MPLS

Network

Control-/M-

Interface

Signaling exchange

UNI

(GMPLS - modified IP signaling/

routing protocols)

Optical Switched Router

OSR

U-Interface

Data

Transfer

Optical Switched Router (OSR)

OSR

Optical Sub-network

OXC : Optical Cross Connect

management infrastructure
Management Infrastructure
  • MPLS MIBs already exist for
    • Modeling the cross-connects in an LSR
    • Requesting and controlling TE-LSPs
  • Enhancements are being made to
    • Support wider definition of “label”
    • Allow control of new GMPLS features
  • Other new MIBs for
    • LMP
    • Link bundling
reliability requirements
Reliability Requirements
  • Problems
    • Layer 3 rerouting may be too slow
    • Granularity of lower layers may be able to protect traffic may be too coarse for traffic that is switched
    • Lower layers may provide link protection
    • But is unable to provide protection against node failures or compute disjoint paths

 Need for GMPLS- based recovery

    • Establishing interoperability of protection mechanismsbetween GMPLS enabled devices (Routers, SONETADMs, Optical Cross- connects, etc)
    • Enables IP traffic to be put directly over WDM opticalchannels and provide a recovery option without anintervening SONET layer.
restoration requirements
Restoration Requirements
  • Restoration Time under 50 ms
  • Required Steps
    • Fault detection, Fault isolation, Error reporting, Re-provisioning, Switch-over
  • Controlling Management Status
    • Management status carried on Signaling requests and responses, Notify messages
    • Alarm-free setup and teardown
    • Status control during protection switchover
traffic engineering requirements
Traffic Engineering Requirements
  • Require to compute paths to deliver QoS
  • Need to know basic topology of the network
  • Need to know available resources on links
  • Must also know link properties in network
  • User/application requests services
managing optical link resources
Managing Optical Link Resources
  • Need to address a common set of issues
    • Isolation of faults transparent networks
    • Scale the number of links without increasing configuration
    • Scale the parallel (“bundled”) links without increasing the amount of information
  • Requires a new protocol to resolve these issues
link management protocol
Link Management Protocol
  • Control Channel Management
    • Maintain an IP control channel between LMP peers
  • Link Verification
    • Map interface IDs and verify data connectivity
  • Link Property Correlation
    • Discover and agree data link properties
  • Fault Management
    • Detect and isolate faults
  • ! Authentication
mpls benefits for optical internet
MPLS Benefits for Optical Internet
  • MPLS was initially designed to optimize and scale IP core networks, via traffic engineering
    • Core for aggregation and scalability
    • Edge traffic classification
  • Take advantage of these existing MPLS capabilities
    • Use label stacking for hierarchical aggregation
    • Provides scalable edge services
mpls based control for optical internet 1
MPLS-based Control for Optical Internet – 1
  • IP-based approaches for rapid provisioning
    • Re-use existing signaling framework
    • Less standardization, faster vendor interoperability
    • No addressing concerns arise (use IP addresses)
  • Key MPLS features exploited
    • Hierarchical LSP tunneling (label stacking/swapping)
    • Explicit routing capabilities
    • LSP survivability capabilities
    • Constraint-based routing
mpls based control for optical internet 2
MPLS-based Control for Optical Internet – 2
  • Traffic Engineering in Optical Network
    • Optical network load balancing
    • Performance optimization
    • Resource utilization optimization
  • Extensions to MPLS signaling
    • Encompass time-division (e.g. SONET ADMs), wavelength (optical lambdas) and spatial switching (e.g. incoming port or fiber to outgoing port or fiber)
    • Label is encoded as a time slot, wavelength, or a position in the physical space
    • Bandwidth allocation performed in discrete units.
mpls based control for optical internet 3
MPLS-based Control for Optical Internet – 3
  • Supports Multiple Types of Switching
    • Support for TDM, lambda, and fiber (port) switching
    • OXC (Optical Cross-Connect) can switch an optical data stream on an input port to a output port
    • A control-plane processor that implements signaling and routing protocol
  • Optical Mesh Sub-Network
    • A net. of OXCs that supports end-to-end networking
    • Provide functionality like routing, monitoring, grooming and protection and restoration of optical channels
forwarding interface of gmpls

PSC

TDM

LSC

FSC

Forwarding Interface of GMPLS
  • Packet-Switch Capable (PSC)
    • Recognize packet/cell boundaries and forward data based on header.
  • Time-Division Multiplex Capable (TDM)
    • Forward data based on the data’s time slot in a repeating cycle.
  • Lambda Switch Capable (LSC)
    • Forward data based on the wavelength
  • Fiber-Switch Capable (FSC)
    • Forward data based on a position of the data in the real physical spaces.

Allow the system to scale by building a forwarding Hierarchy

technical challenges
Technical Challenges
  • Scalability
  • Quality of Service
    • Needed for existing user applications to work as expected
  • Service Transparency
    • For user applications to work
  • Manageability
    • Provisioning
conclusions
Conclusions
  • Architectural Evolution for Optical Network
    • Boundary between Control Plane and Management Plane is obscure
    • Single Control/Management Plane both for IP domain and Optical Domain
    • IP-centric control mechanisms has cost competitiveness
  • Extends MPLS to Optical World
    • Extends Generalized MPLS technologies to encompass time-division, wavelength and spatial switching network
    • Adapt IP Traffics to Optical Bandwidth Granularity
    • Generalized MPLS is used for network evolution scenario