NoEncap: overlay network virtualization with no encapsulation overheads

Abstract

Overlay network virtualization quickly gains traction in to- day’s multi-tenant data centers due to its ability to provide independent virtual networks, at scale, along with complete isolation from the underlying physical network. Despite the benefits, performance degradation due to the imposed per- packet encapsulation overhead is a serious impediment. Mitigation approaches are mostly hardware based and thus depend on costly networking gear upgrades and suffer from lesser flexibility and longer times to market, compared to software solutions. Software optimizations proposed so far are limited in scope, applicability, and interoperability. In this paper we present NoEncap, a software-only opti- mization, capable of eliminating almost completely the over- heads, while fully preserving the benefits of an overlay-based network virtualization.