RMDCN Technical Solution RMDCN Workshop, 18-20 Jan 99ECMWF/TB-1 RMDCN Technical Solution Tony Bakker...

RMDCN Technical Solution

RMDCN Workshop, 18-20 Jan 99 ECMWF/TB-1

RMDCNTechnical Solution

Tony Bakker

WAN Group Leader, Network Section

ECMWF



Agenda (1)

• Background & Requirements

• EQUANT Solution– Access

• Frame Relay

• X25 access

– X25-Frame Relay Gateway



Agenda (2)

• Backup options– ISDN/PSTN Dialup– Mission Critical environment

• TCP/IP Issues

• Prioritisation

• Network Monitoring



Background (1)

• Jan 1993: Working group on Planning and Implementation of the WWW in Region VI:– identified the necessity for GTS reorganization

• Sep 1993: Subgroup on regional aspects of GTS– first proposal for modernisation of RMTN

• 1994 - RMDCN Steering Group established

• 1996 - RFI/RFQ for MDN



Background (2)

• 1997: Steering group recommendation:– A MDN provides a cost effective way for

providing the requirements for an RMDCN– Requested ECMWF to lead and co-ordinate the

procurement, implementation and operational phase for all countries

– establish a Contract Advisory Committee

• Jun 1997: ECMWF Council accepts timetable for RMDCN project



Background (3)

• Nov 1997: RMDCN Contract Advisory Committee and ECMWF– start preperation of ITT Documents

• Apr 1998: ITT

• Dec 1998 - ECMWF Council approves RMDCN Contract with EQUANT



Regional Meteorological Telecommunication Network for Region VI (Europe)point-to-point circuits implementation (transmission speed in kilobit/s) - October 1997

Dublin

SkopjeBaku

Yerevan

Tirana

Beirut

Washington

Beijing

Nairobi

Algiers

Cairo

New Delhi

Jeddah

Casablanca

TripoliTunis

Cairo

Beijing

RTH

NMC

Centre in other region

MTN circuit

Regional circuit

Interregional circuit

Norrköping

Rome

Ljubljana

ECMWF

Copenhagen

Madrid

Athens

Brussels

Belgrade

Kishenev

Kiev

Tbilisi

Bucharest

Helsinki

Oslo

Zagreb

WarsawMinsk

Malta

Amman

Bet Dagan

Reykjavik

SondreStormfjord

De Bilt

Lisbon

ViennaBudapest

Bratislava

Vilnius

Riga

Tallin

Bracknell

Prague

Zurich

Offenbach

Damascus

Ankara

Sofia

Larnaca

Khabarovsk

Novosibirsk

Tashkent

Tehran

Hanoi

128

64

64

64

14.4

9.6

28.8

9.6

28.8

9.6

9.6

9.6

9.6

4.8

4.8

7.2

0.1

2.4

0.05

9.664

9.6

0.15

2.42.4

0.05

0.05

N/O

2.4

9.6

9.6

2.4

24.2

9.6

9.6

0.05

0.05

9.6

9.6

9.6

9.6

Nairobi

Toulouse

640.05

9.6Moscow

0.05

7.2

640.05

N/O

9.6

0.050.05

0.1

0.2

19.2

9.6

64

9.6

19.2

19.2

7.2

9.6

0.1

9.6

9.6

0.2

N/O

N/O

N/O N/O

9.6

9.6

19.2

2.4

2.4

9.6

2.4

9.6

9.6

7.2

38.4

9.69.6

9.6

14.4

9.6

N/04.8

9.69.6

7.2

N/O

9.6N/O

9.6

N/O

Dakar

FIGURE 1

0.1



a

FRANCE

FINLAND

TURKEYITALY

SPAIN

IRELAND

GREECE

NORWAY

DENMARK

NETHERLANDS

PORTUGAL

SWEDEN

SWITZERLAND

32 kb/s

56 kb/s

64 kb/s

128 kb/s

256 kb/s

512 kb/s

2 Mb/s

GERMANYAUSTRIA

HUNGARY

ICELAND

U.K.

CROATIA

SLOVENIA

BELGIUM

JULY 1998

ECNETThe ECMWF external telecommunications

network



Requirements

• combine the two networks – RAVI GTS & ECMWF

• cost savings• technological improvements• fully managed network - uniform service

level• high availability• prioritisation of traffic• multi-protocol (IP, X.25, DECnet)



ECMWF- Dissemination of products (to Member States)- Observations (from Member States)- Interactive sessions- data transfers to/from Member States

GTS- Observations- Forecast data- low priority messages- other data



EQUANT Solution (1)

• Frame Relay Access Service

• complemented by X25 Access Service

• create a Virtual Private Network

• LAN Access Service– fully managed CISCO router service

• Management of Access Line– liaise with PTT (line order, fault reports, etc)



EQUANT Solution (2)

• X25 - Frame Relay Gateway

• TCP/IP as transport protocol– irrespective of access method– X25 encapsulated (XOT)



SITA/EQUANT POP

LAN Access router

Leased line

Virtual Circuit

KEY

EQUANTGlobalNetworkGlobalNetwork

EQUANT Solution



EQUANTGlobal Network

Access Line

LAN

X25 switchMSS

CPEPOP

Access



LAN

X25 switchMSS

POP

CPE

LAN

X25 switchMSS

CPEPOP

EQUANTGlobalNetwork

FR

FR

pvcFrame Relay Access Service



POP

Access Line

FR

CPE

XOT

TCP/IP

pvc

pvc

pvc

pvc

X25

TCP/IP

POP

POP

POP

POP

Equant GlobalNetwork

Frame Relay Access Service



GWPOP

LAN

X25 switchMSS

POP

CPE

LAN

X25 switchMSS

CPEPOP

EQUANTGlobalNetwork

Frame Relay

X25

pvc

svc

X25 Access Service



POP

Access Line

X25

CPE

XOT

TCP/IP

svc

svc

X25

TCP/IP

POP

POP

EQUANT GlobalNetwork

X25 Access ServiceGW

POP

CPE

CPE FR

X25



X25-Frame Relay Gateway

• communication between Frame Relay and X25 connected Sites

• configuration– Special purpose CISCO routers– two different locations within the EQUANT

RMDCN VPN– fully managed by EQUANT



Backup options

• ISDN/PSTN backup– box before CPE serial interface

• Mission Critical– Dual Access Line– Dual CPE– CISCO HSRP– shadow PVC



ISDN Dial Backup

EQUANTGlobal NetworkAccess Line

CPEPOPXM M



Mission Critical

EQUANTGlobal Network

CPEPOPXM M

CPEPOP

M M

HSRPHost POP

CPE



TCP/IP Issues

• Public IP Network Addresses– LAN interface– X25 interface

• EQUANT can provide IP Network Address Range if necessary

• IP routing options– Static routes– OSPF with filtering



Prioritisation

• Standard CISCO options– custom queuing– priority queues– weighted fair queueing

• works on output buffer of PVC

• preference for custom queuing– allocate amount of buffer to traffic pattern

based on src-dest-port (IP level)



Network Monitoring

• EQUANT tools:– SITAVISION: VPN view

• HP Openview add-on

• Allows to monitor all RMDCN CPE interfaces

– TTVISION: Trouble Ticket

• ECMWF will monitor the network and report regularly to RA VI via the RMDCN CAC and the RMDCN Operations Committee (ROC)

RMDCN Technical Solution RMDCN Workshop, 18-20 Jan 99ECMWF/TB-1 RMDCN Technical Solution Tony Bakker...

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