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首页> 外文会议>International conference on mobile, secure, and programmable networking >A Fast Bit-Level MPLS-Based Source Routing Scheme in Software Defined Networks: SD-{W,L}AN
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A Fast Bit-Level MPLS-Based Source Routing Scheme in Software Defined Networks: SD-{W,L}AN

机译：软件定义网络中基于MPLS的快速位级MPLS源路由方案：SD- {W，L} AN

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Today, more concerns are raised to Software Defined Networks (SDN) paradigm since it is a promising concept that offers pro-grammability and scalability by decoupling control and data planes. However, many problems have arisen due to the huge amount of control messages exchanged periodically between the controller and Forwarding Elements (FE) and the limited space of Ternary Content-Addressable Memory TCAM into the switches. The standard Hop-by-Hop forwarding scheme requires that the controller installs at least one flow entry for each flow on each switch. This may lead to a significant bandwidth overhead and unbalanced flow tables. Unfortunately, this scheme seems to be no longer suitable for application neither in SD-LAN nor in SD-WAN. Many solutions were proposed to avoid network performance degradation. The MPLS-based source routing is one of the most emergent schemes that have attracted attention due to its ability to overwhelm deficiency of the standard Hop-by-hop forwarding scheme. However, the MPLS-based forwarding scheme may induce a significant bandwidth overhead due to the fact that a per-hop routing information is carried using one MPLS label which may lead to a wasteful encoding space. This paper aims to avoid wasting available encoding space by reserving exactly the required number of bits to encode each routing information. The proposed scheme is based on affecting a wildcard bit-pattern to each switch. A wildcard bit-pattern is a set of bits that is used to decode the routing path by means of the bitwise XOR operation. The routing path is initially appended to one MPLS label after being encoded. The MPLS label is embedded as a header to each packet. Our scheme is suitable for application in multicast scenarios using the same routing path as the unicast scenarios with no additional bandwidth overhead. Simulation results show that the proposed scheme outperforms parallel solutions in terms of bandwidth overhead, Control traffic overhead and flow tables balancing.
机译：如今，人们对软件定义网络（SDN）范式提出了更多的关注，因为它是一个有前途的概念，它通过将控制平面和数据平面解耦来提供可编程性和可伸缩性。但是，由于在控制器和转发元素（FE）之间定期交换大量控制消息，并且三进制内容可寻址存储器TCAM进入交换机的空间有限，因此出现了许多问题。标准逐跳转发方案要求控制器为每个交换机上的每个流安装至少一个流条目。这可能会导致大量的带宽开销和不平衡的流表。不幸的是，该方案似乎不再适合于SD-LAN和SD-WAN中的应用。为了避免网络性能下降，提出了许多解决方案。基于MPLS的源路由是最新兴的方案之一，由于其具有克服标准逐跳转发方案不足的能力，因此备受关注。但是，基于MPLS的转发方案可能会导致大量带宽开销，原因是使用一个MPLS标签承载逐跳路由信息会导致浪费的编码空间。本文旨在通过精确保留所需的位数来编码每个路由信息来避免浪费可用的编码空间。所提出的方案是基于影响每个交换机的通配符位模式。通配符位模式是一组位，用于通过按位XOR操作解码路由路径。路由路径经过编码后，最初会附加到一个MPLS标签。 MPLS标签作为每个数据包的标头嵌入。我们的方案适用于使用与单播场景相同的路由路径的多播场景中的应用，而没有额外的带宽开销。仿真结果表明，该方案在带宽开销，控制流量开销和流表平衡方面优于并行解决方案。

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