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Flexible Traffic Engineering: When OpenFlow Meets Multi-Protocol IP-

Forwarding

IEEE COMMUNICATIONS LETTERS, VOL. 18, NO. 10, OCTOBER 2014Authors: Suoheng Li ; Yan Shao ; Shoujiang Ma ; Nana Xue ; Shengru Li ;

Daoyun Hu ; Zuqing ZhuUniversity of Science and Technology of China, Hefei, China

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Outline

• IPv6 transition technologies

• Motivation

• System architecture

• System operation procedure

• Evaluation

• Conclusion

• Personal opinion

• Reference

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IPv6 transition technologies:• Dual stack• Allow IPv4 and IPv6 to cTunnel

• Enable network edge devices to interconnect over incompatible networks.• o-exist in the same devices and networks.

• Address translation• Allow IPv6-only devices to communicate with IPv4-only devices.

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Motivation

• IPv6 transition technologies lack of a Flexible Traffic Engineering (F-TE).

• IP transition technique that only makes IPv4- and IPv6-devices inter-operable is not enough for realizing F-TE, since it only pre-configures IP tunnels statically and cannot establish/disassemble them on-the-fly.

IPv4 island

IPv6 island

IPv6 island

IPv4 island

IPv4 island

Client A

Client B

IPv6 island

GWGW

GW

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System architecture

• Using OpenFlow switch as these islands’ gateway.

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System operation procedure

• Network management system (NMS)

• Path provision module (PPM)

• Path computation module (PCM)

• Address translation database (ATD)

• Traffic engineering database (TED)

• open shortest path first (OSPF)

• Simple network management protocol (SNMP)

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Evaluation

• (a)Without TE

• 2 → 1 → 9

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Evaluation• (b)Conventional TE• Path switching for TE is possible but IP

interchanging is not allowed• 2→1→8→9/2→ 4 → 11 → 13 → 9

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Evaluation• (c)TE with static IP-in-IP tunnel tunnel

(ST)• 2→1→8→9• 2→ 3 →( 6 → 5 → 7) → 8 → 9

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Evaluation• (d)F-TE• 2→ 3 → 6 → 5 → 7 →8 →9

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Evaluation

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Conclusion

• This mechanism achieve F-TE in a network that consists of multiple IPv4- and IPv6-islands with online and adaptive IP-forwarding interchanging enabled by OF.

• The SDN-enabled IP interchanging architecture presented in this work could also facilitate seamless transition from IPv4 to IPv6.

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Personal opinions:

• The authors mentioned that they design five new OF flow-matching actions, namely PUSH_ IPv6, POP_IPv6, MOD_IPv6, PUSH_IPv4, and POP_IPv4.• It is a good idea if OpenFlow support these action to make us easy to modify IP layer

headers.• But it is not a standard at all, now.

• In the evaluation chapter, they only used one picture to illustrator four scenarios, it make people hard to understand.

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Reference

• RFC 6219 X. Li, C. Bao, M. Chen, H. Zhang, and J. Wu, The China Education and Research Network (CERNET) IVI Translation Design and Deployment for the IPv4/IPv6 Coexistence and Transition, May 2011 RFC 6219.

• http://en.wikipedia.org/wiki/Teletraffic_engineering