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Software-defined networking (SDN) has improved the routing functionality innetworks like data centers or WANs. Recently, several studies proposed to applythe SDN principles in the Internet's inter-domain routing as well. This couldoffer new routing opportunities and improve the performance of BGP, which cantake minutes to converge to routing changes.  Previous works have demonstrated that centralization can benefit thefunctionality of BGP, and improve its slow convergence that causes severepacket losses and performance degradation. However, due to (a) the fact thatprevious works mainly focus on system design aspects, and (b) the lack of realdeployments, it is not clearly understood yet to what extent inter-domain SDNcan improve performance.  To this end, in this work, we make the first effort towards analyticallystudying the effects of routing centralization on the performance ofinter-domain routing, and, in particular, the convergence time of BGP.Specifically, we propose a Markovian model for inter-domain networks, where asubset of nodes (domains) coordinate to centralize their inter-domain routing.We then derive analytic results that quantify the BGP convergence time undervarious network settings (like, SDN penetration, topology, BGP configuration,etc.). Our analysis and results facilitate the performance evaluation ofinter-domain SDN networks, which have been studied (till now) only throughsimulations/emulations that are known to suffer from high time/resourcerequirements and limited scalability.

Analysing the Effects of Routing Centralization on BGP Convergence Time