ASTN/ASON and GMPLS
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ASTN/ASON and GMPLS Overview and Comparison. By, Kishore Kasi Udayashankar Kaveriappa Muddiyada K. 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

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ASTN/ASON and GMPLS

Overview 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 IP clients over WDM


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  • How?

    • “intelligence” into the control plane of OTN

    • automatic and seamless circuit provisioning

    • unified control binding technologies

  • Benefits?

    • cost reduction and better quality of network operation

    • simplified and rapid network configuration

    • switched services and dynamic bandwidth assignment


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ASTN/ASON

  • ITU-T Recommendation G.805/G.8080

  • Architecture that defines the components and interactions between components

  • Distributed control plane

  • Task of control planes

    • Call and connection control

    • Path control based on network state

    • Discovery for self configuration


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  • Layering

  • Administrative partitioning

  • Operational partitioning

  • Types of interfaces in the control plane


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  • GMPLS

  • Unified control plane for packet and circuit switching technologies

  • Four interfaces.

  • Interface Switching Capability

  • No NNIs.


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  • GMPLS (Continued…)

  • Extension of routing protocols

  • OSPF-TE and ISIS-TE

  • Signaling protocols, RSVP-TE and CR-LDP

  • Label Switched Paths (LSP)


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  • Multi-layer Resource Model Representation

    In GMPLS

    • Basic topology abstraction is TE link

    • Link interface can support one or more interface switching types defined

    • Interface Switching Capability (ISC)

    • ISC descriptor describes related TE properties

    • A particular resource on a link is represented by a label


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  • In GMPLS (Continued...)

    • Basic service abstraction is a LSP

    • Concept of hierarchical LSP

    • LSP in server region represented as TE link or Forwarding adjacency in client region

    • Client LSP routed over a TE link == tunneled within a server LSP


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In ASON (Continued…)

  • Transport networks functional model G.805

  • Client/server association between adjacent layers

  • Each layer partitioned to reflect internal structure


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  • In ASON (Continued…)

  • Partitioning concepts

    • Starting from the smallest indivisible subnetwork

    • Contained and containing subnetwork

    • Contained subnetwork cannot provide connectivity not available in containing subnetwork

    • Ports on boundary of containing subnetworks and interconnection capability are represented by contained subnetworks


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  • In ASON (Continued…)

  • Layering concepts

    • Layer networks in a client-server model

    • Termination and Adaptation Functions

    • Topology and connectivity not visible to client



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Overview of MPLS/GMPLS Concepts

  • Forward Equivalence Class

  • Label

  • LSR

  • LSP

  • Label allocation

  • Next Hop Label Forwarding Entry (NHLFE)

  • Route selection




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  • Control Plane Architecture 576), Fall ‘06

  • In ASON

    • Protocol neutral way

    • Support various transport infrastructure

    • Applicable irrespective of control plane that has been subdivided into domains


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  • System is a collection of components

  • System boundary

  • Nested system boundaries

  • Policy port as filters


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  • In ASON (Continued…) 576), Fall ‘06

  • General model of federation

    • Creation, deletion and maintenance of connections across multiple domains

    • Community of domains

    • Domains cooperate for connection management

    • Joint Federation Model and Cooperative model


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In ASON (Continued…) 576), Fall ‘06

Cooperative Model

Joint federation Model


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  • In ASON (Continued…) 576), Fall ‘06

  • Architectural components

    • Connection controller (CC) component

    • Routing controller (RC) component

    • Link resource manager component

    • Traffic policing (TP) component

    • Call controller component

    • Discovery agent (DA)


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GMPLS Control Plane, Policy-based Management 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 local and global decision logic distributed among multiple network elements and network layers.


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Discussion Items Modeling

  • Advantages and Features.

  • Types of GMPLS policies and actions – few examples

  • Control plane and PBM architecture.

  • GMPLS managed entities

  • Two uses cases to explain PBM in GMPLS


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Advantages Modeling

  • Dynamic, flexible and cooperative interworking

  • Traffic engineering (TE) capabilities brought by GMPLS.

  • Improve operational efficiency.

  • New services requires complex and dynamic configurations of network resources.

  • Avoid configuring node-by-node and consider entire network domain as a whole.

  • Increase automation by using rule sets.


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Features Modeling

  • Standardized operational processes in multi-vendor environments.

  • Policy rule - Network operator has control over state changes for a given network function.

  • Adapting and changing behavior at runtime.

  • Translating SLA, network and management areas (eg. Routing, configuration, fault management) into policies.

  • Adding/deleting/modifying policies in policy repository.


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PBM Framework Modeling

Policy based admission control.

Policy Information Models

“Policies are used to control the state that a managed object is in at any given time; the state itself is modeled using an information model”.

Policy core Information Model (PCIM), MIB, PIB.

Policy rule – It is a binding of a set of policy actions to a set of policy conditions.

Features (Continued…)


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Policies and Policy Actions Modeling

  • Admission Control Policy

    • Call/connection admission action, Call/connection Rejection Action.

  • Signaling Control Policy

    • Signaling recovery action

  • TE Routing Policy

    • Link State Advertisement action, Manage TE Info action

  • Path Computation and Selection Policy

    • Path computation action, Link Type selection action

  • Load Distribution Policy

    • Load distribution action

  • Recovery related policies……


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Need for a separate Control Plane (CP) Modeling

Fundamental principles of GMPLS CP

Separating protocol generic and application specific mechanisms.

TE Link as a unique application specific entity.

Two-stage OSPF architecture and database.

TE Link – resource aggregates that are encoded as links with TE attributes.

OSPF-TE with opaque LSA capabilities along with topology LSA distribution.

Control Plane and PBM Architecture


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GMPLS Managed Entities Modeling

  • Features of NOBEL Information Model.

    • Specifies managed entities and represents control plane (CP)

    • Components, capabilities, interworking of CP components.

  • CP Element represents a control plane instance hosted by a CP node.

  • Separate instances of managed entities for control plane and transport plane entities.



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Use Case 1 Modeling

  • Combined call and connection setup via User Network Interface (UNI).

    • Considering circuit switch capable GMPLS network.

    • SLA/SLS information installed in policy and service admission repository.

    • Global call admission directives in global Call admission policy decision point (PDP) downloaded by policy execution point (PEP).

    • Local and node specific connection admission policies in global connection admission PDP.



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Description Modeling

[1] connection request using call setup messages over UNI

[1b] comparing client id and port with call admission directives, does not match.

[2a] call level parameters translate into network resource related requirements and evaluated by LPDP.

[2b] requirements verified against general connection admission policy

[3] May be asked to renegotiate due to network or node limitation


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Continued… Modeling

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

[5] signaling controller (SgC) requests LPDP to check against signaling control policy rules.

[6] ingress node signals modified call setup request.


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Use Case 2 Modeling

  • Event Driven TE Policy action for TE link utilization threshold crossing event.

    • Emits threshold crossing alert (TSA).

    • use case example - Predefined percentage (say 85%) of the current forwarding adjacency (FA) packet switched connection (PSC) link unreserved bandwidth is consumed.

    • TE link utilization thresholds are set.

  • TE Control action –

    • New FA PSC LSP

    • New FA TDM LSP eg. At the server layer.



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Description Modeling

[1a] TE link emits TCA to TEC, internal signal.

[1b] TE link emits TCA to Management Plane (MP), CP-MP interaction notification.

[2] TEC requests PEP to invoke event policy rule.

[3] PEP forwards decision request to PDP (local, global or both)

[3a],[3b] LPDP evaluates load-distribution action policy rule. If it does not succeed, create LSP create action policy is evaluated with global PDP.


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Continued… Modeling

[4] LPDP evaluates path computation/selection policy rules and delegates TEC to enforce policy decisions.

[5] TEC triggers SgC for setup of server layer.

[6] If success, TEC will check LSA update policy and Information dissemination policy to initiate LSA update.

[7]. TEC updated TEDB with new FA-LSP and notifies MP about result of policy decision [8a]

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


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Bibliography Modeling

  • G.805 ITU-T specification

  • G.8080 ITU-T specification

  • ASON Current status of standardization work, B. Zeuner, G. Lehr, Deutsche Telekom

  • ASON and GMPLS – The battle of optical control plane

    • Data connection limited.

  • Control plane for Optical networks: The ASON Approach, Andrzej Jajszczyk, AGH University of science and 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.