Department of Computer Science and Information Systems

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Author: search.filters.author.Haribabu, KSubject: search.filters.subject.Hybrid SDN

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    A Framework for OpenFlow-like Policy-based Routing in Hybrid Software Defined Networks
    (INC, 2016) Haribabu, K
    Software Defined Networks (SDNs) provide a centralized view and allow extensive programmability of the network. They separate the control and data planes opening up immense scope in developing low cost control and management applications to operate the network. Yet, network administrators are ambivalent to revamp their entire network hardware to bring in SDN-compatible switches. This leads to the need for developing models for gradual adaptation of SDN technology. In this paper, we present a framework which allows for policy implementations based on all OpenFlow version 1.4 specified match fields, over legacy Layer 3 devices. This would enable the legacy networks to reap the benefits of SDN in an incremental, controlled and consistent manner.
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    Achieving waypoint enforcement in multi-VLAN hybrid SDN
    (IEEE, 2018) Haribabu, K; Bhatia, Ashutosh
    The waypoint enforcement in a network can be seen as the act of diverting the path of packets flowing in the network towards a predefined checkpoint to gain a higher degree of control over the network. Most of the existing solutions which perform waypoint enforcement in hybrid-SDN either disturb the existing VLAN configurations or possess certain limitation in terms of placement of SDN switches in the network. In this paper, we address the problem of achieving waypoint enforcement in a multi-VLAN hybrid software defined network (hybrid-SDN), which does not have these limitations. In particular, the proposed method uses the concept of gratuitous ARP (Address Resolution Protocol) to poison the ARP table of all the hosts in the network to divert the traffic packet towards an SDN switch.
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    A Framework to Achieve Full Waypoint Enforcement in Hybrid SDN Networks
    (Springer, 2019) Haribabu, K; Bhatia, Ashutosh
    Software Defined Networking (SDN) addresses the operational challenges faced in maintaining legacy networks by decoupling the data plane and control plane. Overhauling of the network to replace legacy switches with SDN switches is not economically viable. Incremental deployment of SDN devices is the most promising approach. Hybrid SDN network contains both legacy and SDN devices in a network. One of the challenges in hybrid SDN network is to enforce traffic to go through some of the SDN switches (waypoints) present in the network. There exist a few solutions in the literature to achieve waypoint enforcement, but practically none of them provide full waypoint enforcement. In this paper, we propose a novel framework to achieve full waypoint enforcement. The proposed framework uses virtual IP addresses to divert the complete network traffic towards the SDN switches present in the network. We also provide an analysis of the framework.
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    A survey: Hybrid SDN
    (Elsevier, 2017-12) Haribabu, K; Sinha, Yash
    A full deployment of Software Defined Networking (SDN) paradigm poses multi-dimensional challenges viz., technical, financial and business challenges. Technical challenges of scalability, fault tolerance, centralization guarantees exist. Financial challenges of budget constraints, non-availability of phased transition model exist. Business challenges like acceptability, building confidence among network operators etc. exist. Therefore, a direct and sudden transition from legacy networks to pure SDN seems unlikely. A hybrid deployment of SDN can be one of the plausible intermediate paths, primarily because it provides an environment where both legacy and SDN nodes can work together. Thus, an incremental deployment strategy can be developed. Further, hybrid SDN can enforce the benefits of both the traditional networks and SDN paradigm. Hybrid SDN deployment has many advantages including adaptability to budget constraints, central programmability of the network, fallback to time-tested legacy mechanisms and so on. But there are challenges specific to hybrid models, like added complexity of running multiple paradigms together, realizing cooperation between control planes, etc. We envision that more research work is needed to maximize the benefits and limit the drawbacks.