한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

MPLS에서 차등화 서비스를 지원하기 위한 E-LSP의 확장

Extension of E-LSP for Supporting Differentiated Service in MPLS

  • 박기범 (삼성전자 통신연구소) ;
  • 정재일 (한양대학교 전자통신전파공학과 멀티미디어 네트워킹 연구실)
  • 발행 : 2003.12.01
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⟨ 이전 논문 다음 논문 ⟩

초록

차세대 인터넷은 QoS(Quality of Service)의 보장과 초고속 전송을 특징으로 하는데 그 대표적인 구조가 DiffServ(Differentiated Service)와 MPLS(Multi-Protocol Label Switching)이다. 차세대 인터넷에서 종단간 QoS를 보장하기 위해서 DiffServ와 MPLS를 연동하기 위한 기술에 관한 연구가 필수적이고, 현재 이에 관한 연구가 활발하게 진행되고 있다. IETF(Internet Engineering Task Force)의 MPLS WG(Working Group)에서는 이를 위하여 E-LSP(EXP inferred-PSC LSPs)와 L-LSP(Label-Only-Inferred-PSC LSPs) 방안을 제안했는데, 두 가지 방법 모두 MPLS에서 DiffServ의 서비스 클래스를 지원하는데 문제점을 가지고 있다. 본 논문에서는 기존의 E-LPS를 확장하여 DiffServ의 이론적인 모든 클래스와 ECN(Explicit Congestion Notification)을 비롯한 실험적인 기능을 지원하는 확장 E-LSP를 제안한다. 제안된 확장 E-LSP를 이용한 MPLS망에서 보다 세분화된 DiffServ 클래스를 지원할 경우 서비스 품질을 시뮬레이션을 통하여 검증하였다.

NGI(Next Generation Internet) is characterized by QoS(Quality of Service) and high speed transmission. Recently, DiffServ and MPLS become most influential NGI architecture. To guarantee end-to-end QoS, it is essential for NGI to interwork MPLS with DiffServ. Here, MPLS WG(Working Group) in IETF(Internet Engineering Task Force) proposed the method of E-LSP(EXP inferred-PSC LSPs) and L-LSP(Label-Only-Inferred PSC LSPs), but both of them have serious problems to satisfy perfect interworking. In this paper, we proposed an extended E-LSP architecture that supports Perfect DiffServ class and experimental function in MPLS such as ECN(Explicit Congestion Notification) capability. We verify that the proposed E-LSP architecture improves QoS in NGI by using ns2 simulator.

키워드

참고문헌

  1. R. Braden et al., 'Integrated Services in the Internet Architecure : an Overview', RFC 1633, June 1994
  2. S. Blake et al., 'An Architecture for Differentiated Services', RFC 2475, Dec 1998
  3. E. Rosen et al., 'Multi-Protocol Label Switching Architecture', RFC 3031, Jan 2001
  4. Francois Le Faucheur, et al., 'MPLS Support of Differentiated Service', RFC 3270, May 2002
  5. McCanne and S.Floyd, ns-Network Simulator, http://www.isi.edu/nsnam/ns
  6. Kevin Fall, Kannan Varadhan, The ns ManuaI, UC Berkeley and Xerox, June 20, 2001
  7. V. Jabcoson et al., 'An Expedited Forwarding PHB', RFC 2598, June 1999
  8. J. Heinanen et al., 'Assured Forwarding PHB Group', RFC 2597, June 1999
  9. Peter Ashwood-Smith et al., 'Generalized Multi-Protocol Label Switching Architecture',draft-ietf-ccamp-gmpls-architecture-07-txt, May 2003
  10. E. Rosen et al., 'MPLS Label Stack Encoding', RFC 3032, January 2001
  11. K. Ramakhshnan, S. Floyd, 'A Proposal to Add Explicit Congestion Notification(ECN) to IP', RFC 2481(Experimental RFC), January 1999
  12. S. Floyd, and V. Jacobson 'Random Early Detection Gateways for Congestion Avoidance', IEEE/ACM Transactions on Networking, Vol. 1, No.4, pp 397-413, August 1993 https://doi.org/10.1109/90.251892
  13. S.Ganti, N.Seddigh, B.Nandy, 'MPLS Support of Differentiated Service usingE-LSP', Internet-Draft, draft-ganti-mpls-diffs-erv-elsp-02.txt, June 2002
  14. Peter Pieda, Jeremy Ethridge, Mandeep Baines, and Farhan Shallwani, A Network Simulator, Differentiated Services Implementation. Open IP, Nortel Networks, 2000
  15. Luca Martini et al., 'Encapsulation Methods for Transport of Ethernet Frames Over IP/MPLS Networks', Internet-Draft, draft-ietf-pwe3-ethernet-encap-04.txt, October 2003