RWTH Aachen University, Germany Network Economics of SDN-Based Infrastructures: Can We Unlock Value Through ICN Multicast? Vaggelis G. Douros, Janne Riihijärvi, Petri Mähönen Institute for Networked Systems, RWTH Aachen University, Germany vaggelis.douros@inets.rwth-aachen.de PIMRC, October 12, Montreal

Motivation (1) Software-Defined Networking (SDN) Specialized Packet Forwarding Hardware Operating System App Operating System App Specialized Packet Forwarding Hardware Software-Defined Networking (SDN) Separate control plane and data plane SDN is a key asset for the design of future network architectures We focus on Information-Centric Networks (ICN) Key Idea: information is named, addressed, and matched independently of its location

Motivation (2) POINT: IP-over-ICN: the better IP http://www.point-h2020.eu/ Premise: many existing applications can run “better” on an ICN core network

Key Question Is IP-over-ICN better than IP? Key contribution … in terms of network economics? Show me the money! A positive answer seems a necessary (though not a sufficient) condition for a large-scale IP-over-ICN deployment Key contribution the first network economics analysis of IP-over-ICN and its quantitative comparison with IP

A Simple Market N Users, 1 Internet Service Provider (ISP), 1 Content Provider (CP), P Routers Each user wants some of the files of the CP The ISP should decide Whether or not a particular file should be placed in the cache How to transfer each file to the users Multicast or Unicast? Which protocol to use IP or IP-over-ICN? Which should be the decisions of the ISP? The ISP wants to maximize his profit

Methodology (1) Is the transition from IP to IP-over-ICN economically viable? We compute the strategy that maximizes the profit of the ISP for a traditional IP network and then for the IP-over-ICN network We compare them Multicast or unicast? LM: number of multicast links LU: number of unicast links Chalmers-Almeroth metric: q=1-LM/LU=1-(1+P+N)/3N q  1, multicast  q  0, unicast 

Methodology (2) B: bandwidth needed b: bandwidth cost Unless a file is requested by just one user, LM < LU and the ISP should choose multicast instead of unicast

Methodology (3) Should we transfer the file from the cache? R: cache redirection cost Consequently, the strategy of the ISP is summarized as: When at least two users ask for a file, the ISP uses multicast When a file exists in the cache, the ISP transfers it from there

Methodology (4) We also need to take into account The migration cost from IP to IP-over-ICN The initial cache cost C (independent of the protocol) The initial unicast/multicast cost

Performance Evaluation

IP-over-ICN vs. IP with Multicast (1) When IP multicast can be supported, the performance of the two protocols is practically the same Significant difference is noticed only for 10 users

IP-over-ICN vs. IP with Multicast (2) The 2nd most important factor is the IP multicast cost Small value there is potentiaI for IP Large value there is potential for IP-over-ICN

IP-over-ICN vs. IP without Multicast (1) IP-over-ICN significantly outperforms IP without multicast

IP-over-ICN vs. IP without Multicast (2) The difference in the performance increases with the number of users For 100+ users, IP-over-ICN significantly outperforms IP

Take-Home Messages In cases where IP multicast can be supported, IP-over-ICN does not provide significant gains In cases where IP multicast cannot be supported, we can unlock value by using ICN multicast Roadmap Cache placement in more general topologies Game-theoretic analysis of the competition in markets with 2+ ISPs

 Thanks!  Dr. Vaggelis G. Douros Institute for Networked Systems, RWTH Aachen University, Germany e-mail: vaggelis.douros@inets.rwth-aachen.de site: www.aueb.gr/users/douros