gmpls, sdn, optical networking and control planes

Achim Autenrieth, ADVA Optical Networking

MPLS SDN World Congress 2014

March 18-21, 2014 / Paris, France

GMPLS, SDN, Optical Networking, Control Plane

© 2014 ADVA Optical Networking. All rights reserved.22

Cloud Connectivity: What Is Hot?

Network VirtualizationProgrammable WAN connectivity with open SDN implementation

Business ContinuityLow-latency connectivity for synchronous mirroring and disaster recovery solutions

Mega Data Center ConnectivityCost-, space- and power-efficient high-capacity transport

Cloud and traditional data center growth

“Cloud data center traffic will grow 6-fold from 2011 to 2016 reaching ca. 5 ZB”

Source: Global Cloud Index 2012, CiscoData Center Connectivity

Cloud services drive demand for dynamic high-speed data center connectivity

Cloud services drive demand for dynamic high-speed data center connectivity


NMS / CP / SDN

Mission Key Facts

Transport SDN for Flexible Optical Networks

• Datacenter Connectivity

• Cloud Bursting

• Secure multi-tenancy

• Global network visibility with “real-time” control

• De-couple virtual from physical network

• NFV supportFrom cloud access to optical

Terabit/s connectivity

Use Cases and Drivers Enablers

DC Site 1

MAN / WAN

DC Site NEnterprise

Tenant B cloud

Tenant C cloudTenant A cloud

• Network Abstraction

• Virtualization

• Open & standardized interfaces

• Multi-tenancy capability

• Integration with existing OSS / NMS / CP

SDN turns the network into a programmable resourceSDN turns the network into a programmable resource


What is SDN?

Open Networking Foundation white paper

In the SDN architecture, the control and data planes are decoupled, network intelligence and state are logically centralized, and the underlying network

infrastructure is abstracted from the applications.

• SDN is an architectural framework for creating intelligent networks that are programmable, application aware, and more open.

• SDN allows the network to transform into a more effective business enabler.

• SDN enables applications to request and manipulate services provided by the network and allows the network to expose network state back to the applications.

• A key aspect to the architectural framework is the separation of forwarding from control plane, and establishment of standard protocols and abstractions

AT&T Domain 2.0 Vision white paper

How does SDN apply to Optical Transport Networks?How does SDN apply to Optical Transport Networks?


Transport SDN – Early Attempts

“If all you have

is a hammer,

everything looks

like a nail.”

Abraham Maslow, 1966

Transport SDN is much more than OpenFlow and protocol extensions. Transport SDN is much more than OpenFlow and protocol extensions.


Packet Switch != Optical SwitchPacket Switch Optical l-Switch

Signal format Digital electronic Analog optical

Signal structure Ethernet frames Signal dependent

Payload visibility Yes No

Topology discovery In-band (e.g. LLDP) Out-of band (e.g. OSC)

Fabric connectivity Any-to-any Constrained

Path feasibility Implicit Dep. on signal quality

Path set-up Any order Sequential

Target: Optical layer connectivity but hiding optical complexityTarget: Optical layer connectivity but hiding optical complexity


Optical Network != Generic Hardware

Connectivity & Topology DiscoverySignal Mapping & Format Compatibility

Optical Performance ConstraintsSequential Lightpath Setup/Teardown

Optical Power Balancing

OSC

(Out-of-band)

a) 40km

b) 60km

c) 20km

a)

b)

c)

d)

d)

WSS

WSS

WSS

WSS

WSS

Fixed / Tunable transponders

External Wavelengths

Regenerators

Colorless Module(s)

Line Ports

Directionless Module


“Leg

acy

” Tr

an

sport

Network programmability

HW abstraction and virtualization

Centralized management & control

Flow/circuit oriented data plane

SDN vs. “Legacy” Optical Transport

Separation of data and control plane

SDN Principles

Top-down approach: Facilitate optical layer virtualization & programmability.

Top-down approach: Facilitate optical layer virtualization & programmability.


• GMPLS *is* SDN (or a functional component of SDN)

• Control and Data plane separation was a basic design principle together with Centralized Control & Hardware Abstraction: see ASON - RFC4397/4652• Transport node<Data Plane> is a logical network device (…)

originating and/or terminating of a data flow and/or switching (…).

• Controller<Control Plane> is a logical entity that models all control plane intelligence (routing, traffic engineering (TE), and signaling protocols, path computation, etc.). A single controller can manage one or more transport nodes.

SDN/GMPLS for Optical Networks

How to leverage existing GMPLS control plane for SDN?How to leverage existing GMPLS control plane for SDN?


• Orchestration ~ automated configuration / coordination / management of complex systems, devices or systems, can present or deploy autonomic control and elements of control theory.

• A higher level system is required for “end to end composition” or virtual networks

• Abstraction of hardware andvirtualization enables homogeneous service activation processes

• Coordinate the deployment of services controlled by either GMPLS or OpenFlow

End to End Service Orchestrationwith GMPLS as Internal Signaling Protocol

DC

Eth. Aggr.

OpenFlow-controlledEthernet

Aggregation

WAN

GMPLS-controlled virtual (o real)

WSON/SSON

GMPLS

Cloud ComputingOrchestration

OVS

SDNCtrl.

OpenFlow-controlled

Ethernet/L2 Switches

OpenFlow

OVS

OVS

PCE

OpenFlow

SDNCtrl.

SDNCtrl.

?


How Transport Fits in SDN Model

NetworkHypervisor

UserInterfaces

3rd PartyApps

Transport Apps

Optical Network Controller

Management

Fault & Alarms

Configuration

Accounting

Performance

Security

Control

Topology Disc

Path Compute

Provisioning

Resource Mgr

Policy Mgr

Database

Flow DB

Topology DB

Resource DB

Policy DB

Optical Network Hypervisor

Network

Hypervisor

Storage Compute

Optical Network

Orchestration

SDNSDN Controller

Orchestration

• Hypervisors allowed Storage and Compute resources to be managed together.

• SDN allowed Networking to join through an Orchestration layer

• Transport is added by extending the SDN controller function.

Network Hypervisor virtualizes the optical network and presents an abstracted view to the SDN controller

Network Hypervisor virtualizes the optical network and presents an abstracted view to the SDN controller


Topology Virtualization Options

Abstract Link

• “You can reach this destination across this domain with these characteristics”

• Paths in the optical domain become links in the virtual topology

• Allows vendor independent constraint modelling

Virtual Node• Hierarchical abstraction

• Presents subnetwork as a virtual switch

• Simple model, but can be deceptive• No easy way to advertise “limited cross-

connect capabilities”

Virtual Node aggregation hides internal connectivity

issues and physical constraints

Abstract Link aggregation needs compromises and

frequent updates

See also: Aihua Guo, "Network Virtualization", OFC 2014, M2B.5See also: Aihua Guo, "Network Virtualization", OFC 2014, M2B.5


Optical Network Hypervisor

WAN is exposed as virtual topology using OpenFlow or Restful API.

SDN Controller #2

SDN Controller #1

ProviderController

SDN Controller #3

Optical Network Controller / HyperVisorFSP SW Suite

SNMP, NETCONF

OF, NETCONF, RESTful API

OF,

NETCONF,

PCEP

OF, PCEP, NETCONFGMPLS-AL, BGP-LS

SNMP, MTOSI

OpenFlow PCEP GMPLS-ALBGP-LS NETCONF/YANG

REST

Ab

str

acti

on

Physi

cal re

ssourc

es

Deri

ved t

opolo

gy

GMPLS

TED LSPDBPCE


Demonstration of SDN Use Cases

ECOC 2013 Postdeadline Paper

ECOC 2012 ECOC 2012 Postdeadline Paper

OFC/NFOED 2013


STRAUSS SDN Orchestration Testbed

SDN Network Orchestration

ABNO Controller

PCE

GMPLS-enabled Flexi-grid

DWDM domain

Active StatefulPCE

TED LSPDBTED

Topology Server

VNTM

Topology Server OPS

Flow Server

Provisioning Manager

TREMA Controller

REST API

OpenFlow

OpenFlow-enabled

OPS/Flexi-grid

DWDM domain

NOX Controller

REST API

OpenFlow

OpenFlow-enabled OPS

DWDM domain

OpenFlowController

REST API

Network Hypervisor

OpenFlow + GMPLS enabled

DWDM domain

OCS

OPS OCS

TED LSPDB

www.ict-strauss.eu

@ICTstrauss


SDN Enables Optical Network Operation and Control Innovation

Datacenter Connectivity Network Virtualization & Orchestration

Multilayer Optimization Open Application Framework


Optical Transport Network Evolution withSoftware Defined Networking

Network & Service Mgmt & Apps Control Plane SDN

Existing NM & CP software portfolio will be extendedand complemented with new SDN-based software modules

Abstraction & Virtualization

End-to-End Service Orchestration

Network Programmability

Thank You

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gmpls, sdn, optical networking and control planes

Technology

optical complexity

optical layer connectivity

optical transport networks

cloud connectivity

sdn architecture

control plane sdn principles

network intelligence

network state