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IP PoP architecture evolution: next-generation routers and their interrelations with OBS/OPS nodes. Summary. Introduction IP/MPLS inner core network architecture: an example from the Telecom Italia backbone Today PoP architectures in IP core networks:

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slide1
IP PoP architecture evolution:

next-generation routers and their

interrelationswith OBS/OPS nodes

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

summary
Summary
  • Introduction
  • IP/MPLS inner core network architecture:
    • an example from the Telecom Italia backbone
  • Today PoP architectures in IP core networks:
    • a general model + examples from Telecom Italia backbone
    • disadvantages of present core PoP architectures
  • Next-generation IP/MPLS core PoP architectures:
    • a general router/node scheme
    • advantages of next-generation IP/MPLS core PoP architectures
  • Today correspondence between IP PoPs and OTN nodes
  • Interrelation between OBS/OPS (edge) nodes and IP PoPs

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

introduction
Introduction
  • Traffic flows crossing an IP core PoPs are generally:
    • coming from/routed towards access (or metro-access) IP segments;
    • routed towards/coming from the OTN (or metro-core) edge;
    • accordingly, an IP core PoP can often be even co-located with an OTN edge/(core) node: e.g., in national (IP/MPLS) OPB & OTN of Telecom Italia.
  • The full long-term introduction of OBS/OPS networks will probably follow de-layering process:
    • level 3 IP/MPLS traffic will be then the almost unique client (together with level 2 Ethernet channels, where convenient) of the new OBS/OPS transport layer.
  • When OTN nodes will be close to replacement by OBS/OPS nodes:

the evolution of IP core PoPs architecture could have an impact

on OBS/OPS edge/(core) nodesarchitecture to be used.

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

an ip mpls inner core network architecture

ITZ 1

ITZ 1

ITZ 2

ITZ 2

P1

P1

P2

P2

2xGBE 10G

2xGBE 10G

CS 4

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CS 4

POS Stm

POS Stm

-

-

16 (Stm

16 (Stm

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64 in Q2 ‘04)

64 in Q2 ‘04)

CS 1

CS 1

CS 1

Milano Bersaglio

CS 3

CS 3

CS 3

CS 2

CS 2

CS 2

E2/T2

E2/T2

E2/T2

E1/T1

E1/T1

E1/T1

E1/T1

E1/T1

E1/T1

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The lnner Core

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64

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An IP/MPLS inner core network architecture

Node A

Node B

Node C

Node D

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

today ip core pop architectures 1

Inner Core

Inner Core

Access network

IP/MPLS core POP

POP (hub)

POP (hub)

Edge

Edge

GSR

GSR

GSR

GSR

GSR

Core

GSR

Core

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Cat 6509

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Today IP core PoP architectures (1)

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NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

today ip core pop architectures 2
Today IP core PoP architectures (2)

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

disadvantages of today ip core pop architectures 1
Disadvantages of today IP core PoP architectures (1)
  • Today PoPs architectures (each consisting of a sub-networkofn = 4 ÷ 6 routers, as in previous diagrams) show very unfavourable management/cost implications.
  • More power required: with an increase trend roughly proportional to n;
  • More floorarea occupied (so-called footprint): also linearly growing with n;
  • Additionaloperationresources needed (including personnel for provisioning and repair functions): probably increasing at a sub-linear rate (< n);
  • fibredeployment: to be multipliedbyafactork, withnkn2 (the exact k value depends on the meshingdegreeofPoProuterssub-networks).

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

disadvantages of today ip core pop architectures 2
Disadvantages of today IP core PoP architectures (2)
  • In general, the usual incrementalprocedure applied by operators/ service providers - i.e. the installationofanewrouterinIP/MPLSnetworkswheneverneeded - is becoming more and more critical for economicreasons:
    • this operation, in a sub-networkwithhighmeshingdegree (like core PoPs), makes architecturalcomplexityandthencapitalcostsforadditionalresources (interfaces to be added on old routers, newfibrelinks, etc.) togrowonanearlyexponentialbasis.

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

next generation ip mpls core pop architectures
Next-generationIP/MPLS core PoP architectures

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

advantages of next generation ip mpls core pop architectures
Advantages of next-generation IP/MPLS core PoP architectures
  • The compact unified structure of tera-routers, as shown before, provides a reduction of all operator’s cost items (in comparison with those previously evidenced for the case of today’s PoPs), in most of cases byafactorofn (even better as to fibredeployment):
    • the key guideline being that of using a singlerouter (though much more expensive than today simpler products) perPoP.
  • Multi-partitionedtera-routerschemes ensure of carriergradereliability, upto99.999% (as in the case of Chiaro’s new article).
  • ScalabilityofPoPs’ switchingcapacityatlowcost is provided by the multi-shelfarchitecture (e.g.: Cisco [5] and Chiaro).

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

today s correspondence between ip mpls pop s and otn nodes
Today’s correspondencebetween IP/MPLS PoPs and OTN nodes

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

obs ops edge node versus ip pop towards apparatuses integration

(towards other

OBS/OPS nodes)

(from other

OBS/OPS nodes)

De-packetisers/

/de-burstifiers

Packetisers/

/burstifiers

OPXC/OBXC

(from other

IP nodes)

(towards other

IP nodes)

IP router

OBS/OPS (edge) node versus IP PoP: towards apparatuses integration?

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

conclusions
Conclusions
  • Disadvantages of today IP/MPLS core PoP architectures solved with next-generation tera-routers:
    • only asingleapparatusperPoP, while maintaining all redundancies now achieved with complex sub-networks of routers (carriergradereliability, upto99.999%, as well as scalability of PoPs’ switching capacity at low cost can be ensured)
  • Interrelation with future OBS/OPS (edge) nodes, based on today one-to-one correspondence (e.g., inTelecom Italia IP/MPLS network) with OTN nodes:
    • possibility of integration for IP & OBS/OPS nodal structures?

NOBEL Plenary Meeting

Munich, June 13 ÷ 15, 2005

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