C&C Research Laboratories Eurescom AIMS -0- 10.03..98 NEC Europe Ltd. Multimedia communications with IPSOFACTO A.Acharya,F.Griffoul,M.Ott,H.J.Stüttgen(NEC),H.Sanneck(GMD)

C&C Research Laboratories Eurescom AIMS -1- 10.03..98

NEC Europe Ltd.

Multimedia communications with IPSOFACTO

A.Acharya,F.Griffoul,M.Ott,H.J.Stüttgen(NEC),H.Sanneck(GMD)[email protected] - Tel. +49 6221 905 110NEC Europe Ltd. C&C Research Laboratories

Heidelberg - Germany


NEC Europe Ltd.

Content

• NEC‘s IPSOFACTO architecture

• Multimedia support with IPSOFACTO– RSVP over IPSOFACTO

• ACTS IthACI project


NEC Europe Ltd.

Why IP switching ?IP

+ Internet connectivity• defacto standard.• multiple applications.

+ routing flexibility • scalability• receiver-driven,

heterogeneous multicast.

- but low performance routing

Combine IP routing with ATM performance

ATM+ high-speed cell transport

• hardware-based.• standard interface.

- but complex protocols• end-to-end signaling.• sender-driven multicast.• MPOA: complexity.


NEC Europe Ltd.

IP switching by NEC: IPSOFACTO

IP Switching Over Fast Cell Transport

• no ATM signaling, no ATM addresses– GSMP to control the ATM fabric.– flow driven like Ipsilon‘s IP switching.

• coordination-less setup – no hop-by-hop coordination protocol.

• flow based on high-level protocol semantics


NEC Europe Ltd.

IPSOFACTO: Routed mode

Routed mode: unused VC at receiver switched to router

Router / Switch controller

IP IPSOFACTO

ATM – AAL5

1 2

34

Unused VC = 82

Unused VC = 75

C

Each port is an IP interface

IP routing table Dest. IP Interface

1.2 2

4.1.3 3

Input Output

VC table

Port VPI/VCI Port VPI/VCI

1 82 C

C 3 75

1 router/controller port


NEC Europe Ltd.

IPSOFACTO: Adding a switched path

IP

ATM – AAL5

82 1 2

3 75

82

82

75

4

IPSOFACTO

Input Output

VC table


1 82 C

1 82 3 75

IP packet: 4.1.2.3

(2) Forward to next hop on unusedVC 75. Use routing table to determineoutgoing port.

(3) Delete the defaultentry, and add the newswitched path.

(1) First packet of newflow: coming on unusedVC 82.


1.2 2

4.1.3 3


NEC Europe Ltd.

IPSOFACTO: Switched mode

Router / Switch controller

IP

ATM – AAL5

82 1 2

3 75

82

4

IPSOFACTO Input Output

VC table


1 82 3 75

IP packet: 4.1.2.3

75


1.2 2

4.1.3 3

next packets are cell-switched: “route once, switch many” strategy


NEC Europe Ltd.

IPSOFACTO: Flow mapping

use TCP/IP “control” messages

• explicit or implicit– TCP SYN/FIN, RSVP PATH/RESV, PIM Prune/Join, IGMP, ICMP.

• are sent on a default control VC– they are never switched, always routed by the controller.

• processed for per-flow forwarding state– add/modify/delete corresponding switched paths.

– Allows for per-flow QoS extensions.

Soft-state control at the IP level


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IPSOFACTO: Advantages and Issues

+ can run in parallel with standard ATM

+ zero overhead switched path set-up

+ use of protocol semantics: IP level state

- potential high VC consumption

- loop avoidance problem

aggregation, possibly with explicit routing and VC-merge


NEC Europe Ltd.

RSVP over IPSOFACTO

• RSVP periodical messages:– sender-initiated PATH– RESV on reverse path

• IPSOFACTO:– PATH,RESV sent on default control VC– RESV used to move switched VC to

appropriate traffic class.


NEC Europe Ltd.

RSVP: Switch Controller Architecture

ATM driver

mrouted rsvpdCACd

IPSOd

IP

IPSOFACTO

IGMPGSMP

To the switch

Routed VCs Port control VCs


NEC Europe Ltd.

RSVP over IPSOFACTO: Review

• good news– easy IP multicast mapping

– RESV merge and QoS renegotiations possible

• bad news– no QoS support from GSMPv1

– only a subset of reservation styles• no mpt-2-pt VC in current ATM hardware

– limited receiver heterogeneity• VC space exhaustion


NEC Europe Ltd.

IP-Switching Proposal (IthACI)• a third and last ACTS call was due 9/26/97

– one focus on Internet/ATM Integration• the following partners submitted a research

proposal for IthACI: Internet and the ATM: Experiments Enhancements for Convergence and Integration– TC vendors: Alcatel-Bell(Belgium), Cisco(UK),

NEC E (Germany)– System Integrator: Algo Systems (Greece)– Research: GMD FOKUS(Germany), IMEC (Belgium),

University of Surrey(UK), ICS FORTH (Greece)Result:

– IthACI was rated #1 of all IP-Switching proposals


NEC Europe Ltd.

IthACI Objectives• gain field trial experience in using different IP-

switching technologies as access nodes, interconnected via ATM PVCs

• develop functional enhancements not yet adressed by various IP-Switching technologies:

– support for multimedia communication, namely quality of service and multicast functions

– integration of WAN resource management/planning

• impact developing MPLS standard in the IETF


NEC Europe Ltd.

IthACI Islands

W orks tation IB MCom patible

IB MCom patible

Hub


IB MCom patible

Hub


IB MCom patible

Hub

Alc.Bell Islnd NEC Island

Cisco Island


NEC Europe Ltd.

The „Green“ IthACI Island

LANIPSOSW

ATM WAN

PVCsIPSOSWIPSO

SW

IPSOSW

IPSOSW

IPSOSW

IPSOSW

NEC&GMD BerlinNEC

Heidelberg

IMEC (Gent)


NEC Europe Ltd.

SummaryIPSOFACTO• is NEC‘s architecture to combine ATM and IP• it is flow based and open to per flow QoS extensions• IPSOFACTO avoids using an explicit flow-setup or tag

distribution protocol

IthACI• a new ACTS project targeted at field trials with different

IP-Switching variants for a PAN European Internet over an ATM backbone (IPSO, Tag-Sw,...)

• project results are intended to impact MPLS WG• IthACI consortium is interested in participation of other

European groups (like Eurescom)

Documents

C&C Research Laboratories Eurescom AIMS -0- 10.03..98 NEC Europe Ltd. Multimedia communications with IPSOFACTO A.Acharya,F.Griffoul,M.Ott,H.J.Stüttgen(NEC),H.Sanneck(GMD)