RMDCN Network Architecture
Vienna, RMDCN Steering Group 4-6 June 2008
Remy Giraud
ECMWF
RMDCN Network Architecture
Slide 1
1
Standard Service Elements
 Bandwidth for each User Site;
 User Site-specific service and traffic management through
COS mechanisms
 Service Levels depending on the Service Type selected by
User Sites;
 Secured VPN provided through Multi Protocol Label Switching
(“MPLS”) technology;
 Access leased line including its provisioning and monitoring;
 Regular reporting on the VPN performance (Quality of Service
indicators);
 Network Management and Fault management for all Service
Slide 2
elements, all provided on a 724365 basis.
 Router Management (PE and CE) – dedicated VPN Owner
RMDCN Network Architecture
2
RMDCN Service Elements
 Connection to the Network
- In general, doubling of Frame Relay access speed – IP
BANDWIDTH
- Speed Access Line - nearest available
- Direct (Leased Line, Ethernet) CE – PE or Frame Relay PVC
between CE and PE
 Gold Service Type
- Class of Service
 Backup
- Enhanced Resilience: NAS ISDN Backup

ISDN Speed limitation (OBS support)
Slide 3
- Mission Critical Setup
RMDCN Network Architecture
3
MPLS – Strengths and Weaknesses

Robust Technology
Simpler network management:
- Native any to any connectivity
- Flexible use of available bandwidth
- Simplify the engineering required for site
interconnection
- Upgradeability
Allows to benefit from MPLS developments:
- Diversity of access methods (xDSL, Internet, LL…)
- Availability of a large panel of access technologies
and bandwidths
- Built-in management of prioritization mechanism
with IP and MPLS
Cost improvement on global recurring costs
More efficient backup solution  better level of
resilience
MPLS corresponds to market network provider
core strategy
RMDCN Network Architecture

Traffic partitioning more difficult to
implement
Site-to-site bandwidth guarantees are
difficult to achieve
Costs are higher for smaller sites (Costs
redistribution mechanism)
Slide 4
4
Access Methods - dedicated Access
 Technologies
- Native IP – Direct access (LL)
- Frame Relay access, Ethernet access type
 IP Bandwidth
- A unique service on each
type of dedicated access
LL
Bandwidth
IP
Bandwidth
- A flexible parameter
for the site sizing
- From 64 kbps up to 50 Mbps
Flexible
parameter
up to the
LL bandwidth
RMDCN Network Architecture
Slide 5
5
What define an access to the MPLS Cloud ?
 Access Line
 IP Bandwidth
 Standards OBS Service Type
-
-
GOLD – Data Classes Of Service Standard COS profiles

60% - D1, 30% - D2, 10% - D3

66% - D1, 33% - D2

100% - D2
SILVER – Unique COS

100% of the IP bandwidth
 Approved option for the traffic allocation:

D1: 75% - ECMWF dissemination and GTS

D2: 20% - Aladin/RETIM/LACE/coupling File Transmission

D3: 5% - Other (Default)
Slide 6
RMDCN Network Architecture
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COS Management
 Data classes D1, D2 and D3
- CB-WFQ for all classes (relative weight = relative priority in case
of congestion)
- No layer 3 shaping: Each data class can use up to the IP
bandwidth
- No more Frame Relay facilities: Traffic always limited to the IP
bandwidth
CB-WFQ: Class Based – Weighted Fair Queuing
RMDCN Network Architecture
Slide 7
7
APPLICATION CLASSIFICATION RULES
 From the CE to the Backbone.
-
OBS has configured the Network’s application classification rules that
define how the CE router manages the application traffic classification (ie
prioritization) for the outgoing traffic. Application traffic is assigned to
the corresponding COS class (D1, D2 or D3). Unclassified application
traffic will by default be assigned to the “by default” COS class.
 From the Network to the CE.
-
In this direction, the Network takes precedence over the sender User Site
(using COS) and automatically classifies the received data in the same
COS. If the COS used is not configured on the access, then the received
traffic is classified as “unknown type of traffic” and put in the “by
default” COS configured on the access. The per-COS traffic assignment
rules correspond to how traffic flow is mapped to a COS, and is similar to
specifying an access control list. If any incoming traffic is received that
does not match any of the provided rules, this traffic is sent into the lower
Slide 8
level class (might be D2 or D3).
RMDCN Network Architecture
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CONTINGENCY SOLUTIONS
 Standard Connection
- NAS BACKUP – SINGLE CPE
- NAS BACKUP – DUAL CPE (Warm Standby) – Enhanced
- ON-NET BACKUP – DUAL CPE
 Mission Critical Connection
- DUAL CONNECTION – SHADOW ACCESS – SINGLE CPE
- DUAL CONNECTION – SHADOW ACCESS – DUAL CPE

Mission Critical
Slide 9
RMDCN Network Architecture
9
NAS Back-up Resiliency
Proxy Radius
“Warm standby”
router
Customer site
ISDN
Equant
NAS
Authentication
Customer
VPN
OBS Pop
(PE)
PSTN
Equant
IP VPN
network
Warm standby option
dual CPE
resiliency
CE – LNS
router
Hub site: 1 access supporting
• Private Dial traffic
• Traffic to the VPN
RMDCN Network Architecture
Slide 10
ECMWF
10
Dual Connection – Mission Critical
Resiliency
OBS
IP VPN Network
level of resiliency
Customer Site
Equant Pop
CE router
Dual CPE
CE router
Slide 11
RMDCN Network Architecture
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Traffic Partitioning
 MPLS IPVPN:
- No PVC – No CIR – No guaranteed throughput between source
destination
- Any-to-any connectivity
 To limit the any-to-any exposure Access Control Lists
can be defined on local routers
Slide 12
RMDCN Network Architecture
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Routing issues
 Between CE router and NAS router: HSRP
 Mission Critical Setup: 2 CE routers - HSRP
 LAN Route redistribution
- BGP
- EIGRP
- OSPF
- RIP v1, RIP v2
- Static
Slide 13
RMDCN Network Architecture
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Background – The SRF2 Document
 Service Request Form 2
- Used by OBS to

Collect the technical information for each RMDCN site

Internally build the CE routers configurations
- ECMWF is the entry point

Complete the SRF2 documents on behalf of the RMDCN
sites
Slide 14
RMDCN Network Architecture
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Background – The SRF2 Document
 The pre-filled OBS SRF2 document
- One pre-filled SRF2 by OBS per RMDCN IPVPN site
- The focus is on the required technical details pages
Slide 15
RMDCN Network Architecture
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Service Metrics and Help Desk
 SLA 99.9% (100% for Mission Critical sites)
 Now Site Availability (used to be PVC availability)
 Pro-active monitoring
- 24 User Sites
- Only English language
- OBS Help Desk in New Delhi
 Re-active monitoring
- 18 User Sites
- Local Language
Slide 16
RMDCN Network Architecture
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CoS
Load
Balancing
NAS
Backup
Speed
enhanced
Gold
NO
512
2M
enhanced
Gold
NO
384
2M
2M
mission critical
Gold
NO
N/A
Finland
2M
768
enhanced
Gold
NO
256
France
4M
3M
mission critical
Gold
NO
N/A
Germany
2M
2M
mission critical
Gold
NO
N/A
Greece
1M
768
enhanced
Gold
NO
384
Ireland
1M
1M
enhanced
Gold
NO
512
Italy
2M
2M
mission critical
Gold
NO
N/A
Luxembourg *
2M
768
enhanced
Gold
NO
N/A
Netherlands
2M
768
enhanced
Gold
NO
384
Norway
2M
2M
enhanced
Gold
NO
1M
Portugal
768
768
enhanced
Gold
NO
384
Spain
2M
2M
enhanced
Gold
NO
512
Sweden
4M
3M
mission critical
Gold
NO
N/A
Switzerland
2M
768
enhanced
Gold
NO
384
Turkey **
768
768
extra enhanced
Gold
NO
N/A
United Kingdom
2M
2M
Slide
mission critical
17 Gold
NO
N/A
ECMWF
50M
50M
mission critical
Gold
YES
N/A
Access
Speed
IPVPN Port
Speed
Resiliency
Austria
2M
1M
Belgium
2M
Denmark
Country/Site
ECMWF Member States
RMDCN Network Architecture
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ECMWF Co-operating States
Croatia
512
512
enhanced
Gold
NO
256
Czech Republic
2M
2M
enhanced
Gold
NO
1M
Estonia
64
64
enhanced
Silver
NO
64
EUMETSAT
2M
2M
mission critical
Gold
NO
N/A
Hungary
1M
1M
enhanced
Gold
NO
256
Iceland
128
128
enhanced
Gold
NO
128
Lithuania
128
128
enhanced
Silver
NO
128
Romania
2M
256
enhanced
Gold
NO
128
Serbia
512
512
enhanced
Gold
NO
256
Slovenia
256
256
enhanced
Gold
NO
256
Bulgaria
512
512
enhanced
Gold
NO
128
China
2M
2M
mission critical
Gold
NO
N/A
India
128
128
enhanced
Gold
NO
128
Japan
1M
1M
mission critical
Gold
YES
N/A
Jordan
128
128
enhanced
Gold
NO
128
Latvia
128
128
enhanced
Gold
NO
128
Lebanon
128
128
enhanced
Gold
NO
128
FYR Macedonia
128
128
enhanced
Gold
NO
128
Poland
128
128
enhanced
Gold
NO
128
Russian Federation
512
512
Gold
NO
N/A
Saudi Arabia *
512
128
enhanced
Silver
NO
N/A
Slovakia
256
256
enhanced
Silver
NO
128
United Arab Emirates
128
128
enhanced
Gold
NO
64
Other RMDCN Member States
RMDCN Network Architecture
Slide
mission critical
18
18
Questions?
Slide 19
RMDCN Network Architecture
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