Ethernet Services over Transport Ethernet Services over Transport - - PowerPoint PPT Presentation

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6

I nternational Telecom m unication Union

ITU-T

Ethernet Services over Transport Ethernet Services over Transport MPLS (T MPLS (T-

• MPLS)

MPLS)

Italo Busi

Alcatel (Editor of G.8110.1)

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 2

ITU-T

I ntroduction to Ethernet services over T-MPLS

• Transport MPLS

has been defined by ITU-T as an application of the MPLS technology for packet transport networks.

• Ethernet services have been defined by

G.8111.x ITU-T Recommendation series as well as by MEF Technical S pecification

• Ethernet services are defined irrespectively
• n the transport network technology that is

used to support them

• Transport MPLS

is a packet-based transport network technology well suited to support Ethernet services

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 3

ITU-T

I ntroduction to Ethernet services over T-MPLS

• Transport MPLS

networks can be used to implement the following services:

• Point-to-point EPL/ EVPL based on MEF E-Line (point-to-

point EVC)

• Multipoint EVPLAN (Ethernet Virtual Private LAN) based
• n MEF E-LAN (multipoint EVC)
• Rooted multipoint S

ervices based on MEF rooted multipoint EVC

• The implementation of Ethernet services with T-

MPLS benefit from the Transport MPLS

• f being both
• a packet technology (i.e. better fitting the nature of

packet services like Ethernet)

• a transport technology (i.e. a carrier-grade technology

supporting OAM and protection switching capabilities).

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ITU-T

Point-to-point EVC over T-MPLS ( PW Application)

T.Switch T.Switch T.Switch

PW architecture defined in RFC3985 PW application in T-MPLS networks defined in appendix I/G.8110

(PE) (PE) (P)

PSN Tunnel Trail PW Trail

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 5

ITU-T

PW Application in T-MPLS ( Appendix I / G.8 1 1 0 .1 )

MPLS_CI traffic unit Label PWE3 Label Label stack entry (PSN) EXP S TTL Label EXP S TTL MPLS_CI traffic unit MPLS_AP MPLS_AP Server AP Server TCP Optional Control Word Ethernet Service Payload

Server NC Server trail T-MPLS NC ( PSN NC) T-MPLS trail ( PSN trail) T-MPLS trail ( PW trail) T-MPLS NC ( PW NC) Multiple PW’s can be muxed/demuxed (one shown for simplicity)

MPLS / MPLS-m MPLS_CI traffic unit Label PWE3 Label Label stack entry (PSN) EXP S TTL Label EXP S TTL MPLS_CI traffic unit MPLS_AP MPLS_AP Server AP Optional Control Word Ethernet Service Payload

Server NC Server trail Multiple PW’s can be muxed/demuxed (one shown for simplicity)

TM/TM_A

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ITU-T

PW over SDH in T-MPLS ( Appendix I / G.8 1 1 0 .1 )

VC MPLS_CI traffic unit PWE3 Label EXP S TTL Label VC

• n

VC-n_CI traffic unit VC-n_AP MPLS_AP Optional Control Word Ethernet Service Payload MPLS_CI traffic unit PWE3 Label EXP S TTL Label VC

• n

VC-n_CI traffic unit VC-n_AP MPLS_AP Optional Control Word Ethernet Service Payload

T-MPLS trail ( PW trail)

S/TM_A

T-MPLS NC ( PW NC) Sn/Sn-Xv/Sn-Xc trail Sn/Sn-Xv/Sn-Xc NC Server trail Server NC

Server_AP Server_TCP

Multiple PW’s can be muxed/demuxed (one shown for simplicity)

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ITU-T

Multipoint EVC over T-MPLS

T.Switch T.Switch T.Switch

VPLS architecture defined in draft-ietf-l2vpn-vpls-ldp-08.txt

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 8

ITU-T

MP EVC over Multicast T-MPLS

T.Switch T.Switch T.Switch

Work on multicast T-MPLS still on-going

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ITU-T

R-MP EVC over T-MPLS

T.Switch T.Switch T.Switch

Root Leaf Leaf

A partial mesh of T-MPLS PW trails is established connecting only UNI ports that are allowed to speak to each other

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ITU-T

Ethernet Services over Multi-dom ain T-MPLS Netw orks

• T-MPLS

is designed to be a scalable end-to- end packet transport technology

• T-MPLS

supports network partitioning

• Network partitioning at the PW level is

supported in line with the multi-segment PW architecture (draft-ietf-pwe3-ms-pw-arch- 00.txt)

• T-MPLS

supports sub-layer hierarchy

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 1

ITU-T

MS-PW Application in T-MPLS ( Appendix I / G.8 1 1 0 .1 )

MPLS_CI traffic unit Label PWE3 Label Label stack entry (PSN) EXP S TTL Label EXP S TTL MPLS_CI traffic unit MPLS_AP MPLS_AP Server AP Server (T)CP Optional Control Word Ethernet Service Payload

T-MPLS trail ( PW trail) T-MPLS NC ( PW NC)

MPLS_CI traffic unit Label PWE3 Label Label stack entry (PSN) EXP S TTL Label EXP S TTL MPLS_CI traffic unit MPLS_AP MPLS_AP Server AP Server (T)CP Optional Control Word Ethernet Service Payload T-MPLS NC ( PSN1 NC) T-MPLS trail ( PSN1 trail) T-MPLS NC ( PSN2 NC) T-MPLS trail ( PSN2 trail)

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 2

ITU-T

Conclusion

• Transport MPLS

is a very promising carrier- grade packet transport technology for supporting packet services over new- generation transport networks

• This presentation has shown how T-MPLS

networks can be used to support carrier- grade Ethernet services

• Point-to-point, multipoint as well as rooted-

multipoint Ethernet services can be supported