Internet Exchange Points (IXPs) play a crucial role in the Internet ecosystem. However, existing literature fails in quantitatively assessing the advantage for an Internet Service Provider (ISP) to peer at an IXP. We give a contribution to bridge such a gap by collaborating with three medium-sized ISPs in Italy to compare key performance indicators (round-Trip delay, hop count, packet loss, and jitter) as measured from several vantage points in presence and absence of IXP peerings. Our findings are that IXP-based paths exhibit better and more stable performance, whereas avoiding IXPs introduces performance deterioration and higher variability. Moreover, our measurements confirm that IXP-based paths tend to preserve the locality of traffic.
DI BARTOLOMEO, M., DI BATTISTA, G., DI LALLO, R., Squarcella, C. (2015). Is it really worth to peer at IXPs? A comparative study. In Proceedings - IEEE Symposium on Computers and Communications (pp.421-426). Institute of Electrical and Electronics Engineers Inc. [10.1109/ISCC.2015.7405551].