Abstract
In SDN architecture, the control channel between the control and data planes is extremely significant, which has two connection modes: out-of-band mode and in-band mode. For in-band mode, the key to the establishment of SDN control channel is how to forward in-band control traffic in the data plane (control traffic: traffic between controllers and switches). In almost all the existing implementation of the in-band SDN networks, the forwarding of in-band control traffic in the data plane depends on distributed Layer 2 switching that cannot respond to the network state change immediately. In this article, we propose a Centralized Trust-based In-Band (CTIB) control mechanism for SDN in-band control channel. Then based on CTIB control mechanism, we design CTIB routing algorithm to select the most trusted control path for each data plane switch in order to improve the QoS (Quality of Service) of in-band control traffic. Furthermore, we implement CTIB control mechanism in an in-band SDN network and carry out several experiments to test the QoS of the in-band control traffic. The results indicate that there is a huge improvement of in-band control traffic QoS when using CTIB control mechanism compared to the distributed Layer 2 switching.
Highlights
The concept of SDN (Software Defined Networking) was firstly proposed in 2008 [1]
In current implementations of the inband mode, the forwarding of in-band control traffic depends on Layer 2 switching which cannot adapt to the network state changes
We propose Centralized Trust-based In-Band (CTIB) control mechanism for SDN in-band control channel to improve the in-band control traffic QoS
Summary
The concept of SDN (Software Defined Networking) was firstly proposed in 2008 [1]. With continuous research, SDN architecture becomes more and more complete and diversified. We propose Centralized Trust-based In-Band (CTIB) control mechanism for SDN control channel and design CTIB routing algorithm to improve the QoS of the inband control traffic. We define this Centralized Trust-based In-Band control as: Control plane collects the data plane information; Based on the information, control plane makes full use of data plane link resources to select the most trusted control path (control path: the connection path between a controller and a switch) for each data plane switch according to the CTIB routing algorithm. We implement CTIB control mechanism in an in-band SDN network and compare the QoS of in-band control traffic when using CTIB control and distributed Layer 2 switching.
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