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RMDCN Technical 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

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rmdcn technical solution

RMDCNTechnical Solution

Tony Bakker

WAN Group Leader, Network Section

ECMWF

RMDCN Workshop, 18-20 Jan 99

agenda 1
Agenda (1)
  • Background & Requirements
  • EQUANT Solution
    • Access
      • Frame Relay
      • X25 access
    • X25-Frame Relay Gateway

RMDCN Workshop, 18-20 Jan 99

agenda 2
Agenda (2)
  • Backup options
    • ISDN/PSTN Dialup
    • Mission Critical environment
  • TCP/IP Issues
  • Prioritisation
  • Network Monitoring

RMDCN Workshop, 18-20 Jan 99

background 1
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

RMDCN Workshop, 18-20 Jan 99

background 2
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

RMDCN Workshop, 18-20 Jan 99

background 3
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

RMDCN Workshop, 18-20 Jan 99

requirements
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)

RMDCN Workshop, 18-20 Jan 99

slide10

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

RMDCN Workshop, 18-20 Jan 99

equant solution 1
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)

RMDCN Workshop, 18-20 Jan 99

equant solution 2
EQUANT Solution (2)
  • X25 - Frame Relay Gateway
  • TCP/IP as transport protocol
    • irrespective of access method
    • X25 encapsulated (XOT)

RMDCN Workshop, 18-20 Jan 99

equant solution
EQUANT Solution

EQUANT

Global

Network

Global

Network

KEY

SITA/EQUANT POP

LAN Access router

Leased line

Virtual Circuit

RMDCN Workshop, 18-20 Jan 99

access

X25 switch

MSS

CPE

LAN

Access

Access Line

POP

EQUANT

Global

Network

RMDCN Workshop, 18-20 Jan 99

frame relay access service
Frame Relay Access Service

MSS

X25 switch

FR

CPE

LAN

POP

EQUANT

Global

Network

pvc

MSS

X25 switch

POP

CPE

LAN

FR

RMDCN Workshop, 18-20 Jan 99

frame relay access service1
Frame Relay Access Service

POP

X25

POP

pvc

Equant

Global

Network

XOT

Access Line

pvc

POP

pvc

POP

TCP/IP

FR

pvc

TCP/IP

CPE

POP

RMDCN Workshop, 18-20 Jan 99

x25 access service

GW

X25 Access Service

MSS

X25 switch

CPE

LAN

POP

Frame Relay

pvc

EQUANT

Global

Network

POP

svc

MSS

X25 switch

POP

X25

CPE

LAN

RMDCN Workshop, 18-20 Jan 99

x25 access service1
X25 Access Service

FR

CPE

GW

POP

X25

POP

EQUANT

Global

Network

XOT

Access Line

svc

POP

POP

TCP/IP

svc

X25

X25

TCP/IP

CPE

CPE

RMDCN Workshop, 18-20 Jan 99

x25 frame relay gateway
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

RMDCN Workshop, 18-20 Jan 99

backup options
Backup options
  • ISDN/PSTN backup
    • box before CPE serial interface
  • Mission Critical
    • Dual Access Line
    • Dual CPE
    • CISCO HSRP
    • shadow PVC

RMDCN Workshop, 18-20 Jan 99

isdn dial backup

M

M

ISDN Dial Backup

X

POP

EQUANT

Global

Network

CPE

Access Line

RMDCN Workshop, 18-20 Jan 99

mission critical

M

M

M

M

Mission Critical

X

POP

CPE

EQUANT

Global

Network

POP

Host

HSRP

POP

CPE

CPE

RMDCN Workshop, 18-20 Jan 99

tcp ip issues
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

RMDCN Workshop, 18-20 Jan 99

prioritisation
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)

RMDCN Workshop, 18-20 Jan 99

network monitoring
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 Workshop, 18-20 Jan 99

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