Functionally distributed transport networking architecture for Future Network

1Copyright (C) 2009 Nippon Telegraph and Telephone Corporation. All rights reserved.

Functionally distributed Functionally distributed transport networking transport networking

architecture architecture for Future Networkfor Future Network

2009/4/8

Shinichiro ChakiNTT Network Service Systems

Laboratories

2

Network Service Systems Laboratories

Copyright (C) 2009 Nippon Telegraph and Telephone Corporation. All rights reserved.

What is Future Network?

◆ ITU-T SG13 Q21Future Network (FN): A network which is able to provide revolutionary

services, capabilities, and facilities that are hard to provide using existing network technologies.Note: FN provides mechanisms that benefit every participant as much as they contribute. It will be studied based on clean-slate approaches.

◆ What is revolutionary services, capabilities and facilities?Will be discussed in Focus Group on Future Networks.

◆ Many requirementInfrastructure which handle medical treatment, education, security, public office, welfare etc., not only market or playground. Avoid digital divide. Handle not only human but also things. From tiny bandwidth to huge bandwidthHuge number of terminals

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Virtualization?

◆Future Network expected to support virtualizationSharing Network Resources;

packet bandwidth, time slot, wave length, optical fiber, etc.Network functions?

VPN-GW, Traffic Monitor, NAT/FW(DPI), etc.?Network server functions?

DNS, AAA, Strage, etc.?

Optical Transparent Network

Packet Network #1 Packet Network #3

Packet Network #2

DNSAAA Strage

DNSAAA Strage

DNSAAA Strage

DNSAAA Strage

GW Mon. NAT/FW

GW Mon. NAT/FW

GW Mon. NAT/FW GW Mon. NAT/FW

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Requirements to construct Future Network

• Easy to build large-scale network

• Easy to software upgrade

• Easy to add new hardware related functions

• Easy to control path according to a policy

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Functionally distributed transport networking architecture

Existing transport networkExisting transport network Functionally distributed transport networkFunctionally distributed transport network

◆ To construct future network which solve the problems of increasing the size of networks and enable easy addition of functions to the transport, functionally distributed transport networking architecture will be a candidate.

◆ The architecture separates the control-plane processing part (control element, CE) from the forwarding plane processing part (forwarding element, FE) of the transport system.

CE

FE

CE

FE

CE

FE

CE

FE

CE

FE

FE

FE

CE

FE

FE

FE

CEFE

CEFE

CEFE

CEFE

CEFE

CEFE

CEFE

CEFE

AS １

AS2 AS3

CE

FEFE

FE

CE

FEFE

FE

CE

FEFE

FE

CE

FEFE

FE

AS １

Routing mechanism becomes complicated (e.g. Routing for inter-AS)

All nodes need program upgrade to add new functions or to install corrected program.

Bug fix new functions

★★

★★ ★★

★

★ ★

★

Separates CE from FE of router, physically.CE controlls FEs.

CE: Control ElementFE: Forwarding Element

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Functional overview of each elements

• CE performs functions that:– collect and manage the topology information of the

network between the FEs and construct the LSDB.– exchange the LSDB with other CEs that control other FE

groups.– compute the routing information base (RIB).– generate the forwarding information base (FIB) of each

connected FE from the RIB.– send each FIB to the corresponding FE via the control

session.

• FE performs functions that:– collect topology information about the network between

adjacent FEs.– send topology information to the CE.– forward the data packets based on the FIB.

• SE is an element in which the service processing (for example, security and access control) is executed on demand from the CE.

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Easy to build large-scale network

CE

FE

CE

FE

CE

FE

CE

FE

CE

FE

FE

FE

CE

FE

FE

FE

CE

FE

CE

FECE

FE

CE

FECE

FE

CE

FECE

FE

CE

FE

AS １

AS2 AS3

CE

FE

FE

FE

CE

FE

FE

FE

CE

FE

FE

FE

CE

FE

FE

FE

AS １

The information between CEs is decreases, so division of AS is unnecesary.

Division of AS is needed for scalability. Restriction of protocol will occur in inter-AS environment.

A large-scale network can be built without dividing AS.


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Easy to software upgrade

Maintenance operation time is reduced by using one CE to control several FEs.

CE

FE

CE

FE

CE

FE

CE

FE

CE

FE

FE

FE

CE

FE

FE

FE

SE

Corrected software

The number of CE(s) that should be upgraded decreases.

All CEs have to upgrade a software.


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CE

FE

Easy to add new functions

CE

FE

CE

FE

CE

FE

FE

FE

CE

FE

FE

FE

SE

Transport network service functions (e.g. Packet filtering)

SESE

SECE

FESE

All FEs must upgrade to add new service functions.

SE provides service functions to packets transmitted from FE.

SE

An existing route is slightly changed so that it may go via an SE.

There is no necessity to add the new functions to all FEs. - New service can be developed in a timely manner at a low cost. - New service can be started from a small scale.


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Easy to control path according to a policy

CE

FE

CE

FE

CE

FE

CE

FE

CE

FE

FE

FE

CE

FE

FE

FE

SE

Routing information is gathered by a CE, so the CE easily controls the path by policy base routing.

Each node calculates a path by carrying out autonomous distribution, so controlling paths is difficult.

CE collects routing information, which can be performed, so that application of a new policy is easy.


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FiberWDM-FE WDM-FE

-FE -FE

STMTS-FE TS-FE

Packet-FE Packet-FEPacket

VPN-SE VPN-SE

AAA-SE AAA-SE

TCP SE TCP SE

CE CE

One image of future network architecture

Time critical or huge volume

transfer

For user’s on demand request;by SIP or new in channel protocol?

Secure Closed Network

TCP comm. With long delay

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SE example : TCP accelerator SE

Throughput

Time

RTT2

Throughput

Time

RTT1

Throughput

TimeRTT2

TCP slow start mechanism strongly depend on round trip time(RTT). TCP accelerator accelerate TCP communication with large RTT.

Ack

Ack

Ack

Ack

Divided Ack

SE provides real-time process for flow, stream, or packets.

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Thank you

This work is partly supported by the National institute of Information and Communications Technology (NICT).

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Functionally distributed transport networking architecture for Future Network