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1

ASTN/ASON and GMPLSOverview and Comparison

By,

Kishore Kasi Udayashankar

Kaveriappa Muddiyada K

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Motivations Complex process of provisioning of end-to-end transport

service

Heterogeneous transport networks

Automation of end-to-end provisioning

Ability to offer more service

Directly integrate I clients over !DM

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How"

#intelligence$ into t%e control plane of &'( automatic and seamless circuit provisioning

unified control binding tec%nologies

)enefits" cost reduction and better *uality of network operation

simplified and rapid network configuration

switc%ed services and dynamic bandwidt% assignment

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A+'(,A+&(

I' -' .ecommendation /0 23,/0 2 2 Arc%itecture t%at defines t%e components and interactions

between components

Distributed control plane

'ask of control planes

Call and connection control

at% control based on network state

Discovery for self configuration

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A+'(,A+&( 4Continued56rotocols must support multi-layer7 multi-vendor network

8ayering

Administrative partitioning &perational partitioning

'ypes of interfaces in t%econtrol plane

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/M 8+nified control plane for packet and circuit switc%ing

tec%nologies

9our interfaces0

Interface +witc%ing Capability (o ((Is0

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/M 8+ 4Continued56

:xtension of routing protocols

&+ 9-': and I+I+-':

+ignaling protocols7 .+; -': and C.-8D

8abel +witc%ed at%s 48+ 6

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Multi-layer .esource Model .epresentation

In /M 8+ )asic topology abstraction is ': link

8ink interface can support one or more interface switc%ingtypes defined

Interface +witc%ing Capability 4I+C6

I+C descriptor describes related ': properties

A particular resource on a link is represented by a label

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In /M 8+ 4Continued0006 )asic service abstraction is a 8+

Concept of %ierarc%ical 8+

8+ in server region represented as ': link or9orwarding ad

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Multi-layer .esource Model .epresentation

In A+&( I+C concept %as been reduced

&ptical part of &'( %ierarc%y is mapped to 8+C

Digital pat% layers of &'( and +DH %ierarc%y is mapped to'DM

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In A+&( 4Continued56

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In A+&( 4Continued56

'ransportnetworks functionalmodel /0 23

Client,serverassociation betweenad

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In A+&( 4Continued56

artitioning concepts

+tarting from t%e smallest indivisible subnetwork

Contained and containing subnetwork

Contained subnetwork cannot provide connectivity notavailable in containing subnetwork

orts on boundary of containing subnetworks andinterconnection capability are represented by contained

subnetworks

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In A+&( 4Continued56

artitioning concepts 4contd56

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In A+&( 4Continued56

8ayering concepts 8ayer networks in a client-server model

'ermination and Adaptation 9unctions

'opology and connectivity not visible to client

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In A+&( 4Continued56

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&verview of M 8+,/M 8+ Concepts

9orward :*uivalence Class

8abel

8+.

8+

8abel allocation

(ext Hop 8abel 9orwarding :ntry 4(H89:6

.oute selection

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9rom> Dr0 Harry erros7 Connection &riented (etworks 4C+C 3?@67 9all 2@

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9rom> Dr0 Harry erros7 Connection &riented (etworks 4C+C 3?@67 9all 2@

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Control lane Arc%itecture

In /M 8+

eer model

&verlay model

Augmented model

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Control lane Arc%itecture

In A+&(

rotocol neutral way

+upport various transport infrastructure

Applicable irrespective of control plane t%at %as beensubdivided into domains

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In A+&( 4Continued56

/eneral model of policy

+ystem is a collection ofcomponents

+ystem boundary

(ested system boundaries

olicy port as filters

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In A+&( 4Continued56

/eneral model of federation Creation7 deletion and maintenance of connections

across multiple domains

Community of domains

Domains cooperate for connection management

Boint 9ederation Model and Cooperative model

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In A+&( 4Continued56

Boint federation Model Cooperative Model

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In A+&( 4Continued56

Arc%itectural components Connection controller 4CC6 component

.outing controller 4.C6 component

8ink resource manager component 'raffic policing 4' 6 component

Call controller component

Discovery agent 4DA6

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GMPLS Control Plane, Policy-basedManagement and Information Modeling

Policy based Management (PBM)Improve collaboration between management and

GMPLS control plane.Extending Policy Core Information models (PCIM) with policy events.

Diverse l ocal and global decision logic d istributed

among multiple network elements and network layers.

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Discussion Items

Advantages and Features.Types of GMPLS policies and actions few examplesControl plane an d PBM architecture.GMPLS managed entitiesTwo uses cases to explain PBM in GMPLS

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Advantages

Dynamic, exible an d cooperative interworkingTraffic engineering (TE) capabilities brought by GMPLS.Improve op erational efficiency.New services requires complex and dynamiccongurations of network resources.Avoid conguring node-by-node an d consider entirenetwork domain as a whole.Increase au tomation by using rule sets.

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Features

Standardized operational processes in multi-vendorenvironments.Policy rule - Network operator has co ntrol over statechanges for a g iven network function.Adapting and changing behavior at runtime.Translating SLA, network and management areas (eg.Routing, conguration, fault management) into policies.

Adding/deleting/modifying policies i n policyrepository.

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Features (Continued)

PBM FrameworkPolicy b ased admission control.

Policy Information Models

Policies are used to co ntrol thestate t hat a m anaged object is i n atany given time; the st ate i tself ismodeled using an informationmodel .

Policy cor e Information Model(PCIM), MIB, PIB.Policy rule It is a b inding of aset of policy actions t o a set ofpolicy conditions.

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Policies a nd Policy Actions

Admission Control PolicyCall/connection admission action, Call/connection Rejection Action.

Signaling Control PolicySignaling recovery a ction

TE Routing PolicyLink State Advertisement action, Manage TE Info action

Path Computation and Selection PolicyPath computation action, Link Type sel ection action

Load Distribution PolicyLoad distribution action

Recovery related policies

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Control Plane and PBM Architecture

Need for a separate Control Plane(CP)Fundamental principles ofGMPLS CP

Separating protocol generic an dapplication sp ecic mechanisms.TE Link as a u nique ap plicationspecic en tity.Two-stage O SPF architecture an ddatabase.

TE Link resource ag gregatesthat are en coded as links with TEattributes.OSPF-TE with opaque LSAcapabilities al ong with topologyLSA distribution.

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GMPLS Managed Entities

Features of NOBEL Information Model.Species managed entities and represents control plane (CP)Components, capabilities, interworking of CP components.

CP Element represents a con trol plane instance hosted by a CP node.

Separate i nstances of managed entities f or control planeand transport plane entities.

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Managed entities representing CP Elementsand components

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Use Case 1

Combined call and connection setup via User NetworkInterface (UNI).

Considering circuit switch capable GMPLS network.

SLA/SLS information installed in policy a nd service ad missionrepository.Global call admission directives i n global Call admission policydecision point (PDP) downloaded by policy execution point (PEP).Local and node specic connection admission policies in globalconnection admission PDP.

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Call and Connection Setup via UNI

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Description

[1] connection request using call setup messages over UNI[1b] comparing client id and port with call admission

directives, does n ot match.[2a] call level parameters translate i nto network resource

related requirements and evaluated by LPDP.[2b] requirements veried against general connection

admission policy[3] May b e as ked to renegotiate d ue to network or node

limitation

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Continued

[4] connection setup is delegated to TEC which checksagainst path selection policy rules with LPDP

[5] signaling controller (SgC) requests L PDP to check

against signaling control policy rules.[6] ingress node s ignals modied call setup request.

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Use Case 2

Event Driven TE Policy action for TE link utilizationthreshold crossing event.

Emits t hreshold crossing alert (TSA).use case exam ple - Predened percentage (say 85%) of thecurrent forwarding adjacency (FA) packet switched connection(PSC) link unreserved bandwidth is consumed.TE link utilization thresholds are set .

TE Control action

New FA PSC LSPNew FA TDM LSP eg. At the server layer.

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Event Driven TE Policy Action

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Description

[1a] TE link emits TCA to TEC, internal signal.[1b] TE link emits TCA to Management Plane (MP), CP-

MP interaction notication.[2] TEC requests PEP to invoke even t policy r ule.[3] PEP forwards d ecision request to PDP (local, global or both)[3a],[3b] LPDP evaluates l oad-distribution action policy

rule. If it does n ot succeed, create L SP create a ctionpolicy is evaluated with global PDP.

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Continued

[4] LPDP evaluates path computation/selection policyrules and delegates TEC to enforce p olicy decisions.[5] TEC triggers Sg C for setup of server layer.[6] If success, TEC will check LSA update p olicy and

Information dissemination policy to initiate LSAupdate.[7]. TEC updated TEDB with new FA-LSP and noties MP

about result of policy decision [8a]

[8b] TE Link emits state change n otication to inform MP.

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Bibliography G.805 ITU-T specication G.8080 ITU-T specication ASON Current status of standardization work, B.

Zeuner, G. Lehr, Deutsche Tel ekom ASON and GMPLS T he battle of optical control plane

Data con nection limited. Control plane for Optical networks: The ASON

Approach, Andrzej Jajszczyk, AGH University ofscience an d technology, Krakow, Poland

ASON and GMPLS Overview and Comparision, S.Tomic, B. Statovci-Halimi, A. Halimi GMPLS Control Plane, policy based management, and

information Modelling, H.Lonsethagen, et. al.