Dig into MPLS: Transit Tunnel Diversity 🗓 🗺
Université de Liège
Where and When
Lunedì 2 febbraio 2015 Ore 12:00-13:00
Sala Riunioni, 1° piano, Dipartimento di Ingegneria
Via della Vasca Navale, 79, Roma
Traffic Engineering (TE) is one of the key for improving routing in the Internet. In theory, it allows IP network operators to finely tune their forwarding paths according to various customer needs. One of the most popular tool available today to enable TE is MPLS. Using a specific routing trace dataset, we investigate the current and practical use of MPLS. While it appears to be a commonly deployed feature in ISP networks, the purpose of its main usage has not yet been deeply studied. Tunnels may be built either through the basic Label Distribution Protocol (LDP) that does not allow TE or through RSVP that enables TE. Since we observe a frequent tunnel diversity for transit traffic, we introduce a label based pattern recognition method to help distinguishing those two types of tunnels. From our classification, we can conclude that LDP is clearly the rule, while the use of RSVP-TE to finely manage distinct Forwarding Equivalent Classes (FEC) seems, up to now, to remain marginal.