Phase 2 Upgrade of the CMS Tracker

An upgrade program is planned for the LHC which will smoothly bring the luminosity up to or above ${5\times10^{34}\,\mathrm{cm^{-2}}\mathrm{s^{-1}}}$ sometimes after 2020, to possibly reach an integrated luminosity of ${3000\,\mathrm{fb^{-1}}}$ at the end of that decade. In this ultimate scenario, called Phase-2, when LHC will reach the High Luminosity phase (HL-LHC), CMS will need a completely new Tracker detector, in order to fully exploit the highly-demanding operating conditions and the delivered luminosity. The new Tracker should have also trigger capabilities. To achieve such goals, R\&D activities are ongoing to explore options and develop solutions that would allow including tracking information at Level-1. The design choices for the CMS pixel and outer tracker upgrades are discussed along with some highlights of the R\&D activities and expected detector performance.