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RISS 인기검색어
- 검색키워드
- 저자 : Pankaj Thorat (검색결과 2 건)
- 무료
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SDN 에서 데이터 평면 장애를 해결하는 빠른 우회 기법
( Pankaj Thorat ),염상길 ( Sanggil Yeom ),주현승 ( Hyunseung Choo ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1
Successful deployment of the Software Defined Network (SDN) depends on its ability to cope up with network failures. There are various types of failures that may occur in an SDN. The most common are switch and link failures. It is necessary to recover the network from failures for a continuous service availability. But for the real-time services fast recovery from the failure is required to minimize the service disruption time. In the proposed work, we focused on minimizing the recovery time after the failure is detected. Once the failure is detected, the controller involvement is needed to dynamically reroute the failure disrupted flows from the failed component to an alternate path. The aim of the proposed scheme is to provide a traffic management scheme which can react to the dynamic network events by rapidly modifying the forwarding behavior of the switches for faster in-band network adaptability. The proposed scheme (1) Considers the shared data and control path delay (2) Optimally utilize the network resources (3) Eliminates the need of constant monitoring overhead at the controller which results into faster detouring and ultimately rapid recovery.
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Rapid Recovery from Link Failures in Software-Defined Networks
Pankaj Thorat,Syed M. Raza,김동수,추현승 한국통신학회 2017 Journal of communications and networks Vol.19 No.6
Carrier-grade networks (CGNs) can leverage the networkprogrammability of software-defined networking (SDN) toensure fast recovery and high availability. However, for the successfuladoption of SDN, the failure recovery requirement must beaddressed. Local detouring is a popular approach for faster recoveryrather than path-based end-to-end recovery. For fast localrecovery, alternate paths must be preinstalled for each individualflow on the link, which in some cases results in storing thousandsof alternate path flow rules. Furthermore, the dependenceon the controller for dynamic per-flow detouring may delay the recovery. In this paper, we propose local immediate (LIm) and immediatecontroller dependent (ICoD) recovery mechanisms to addressthe limitations of OpenFlow-based link recovery approaches. Ourproposed mechanisms considerably reduce the alternate path flowrules by aggregating the disrupted flows using virtual local areanetwork (VLAN) tagging. The proposed algorithms achieve recoverywithin 3 ms and 20 ms, respectively and satisfy the strict 50 msrecovery requirement of CGNs. LIm and ICoD also reduce the alternatepath flow storage requirement by up to 99%. Simulationresults reveal that the flow-aggregation also reduces the effort ofthe controller and minimizes the alternate path installation traffic.
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