  We present measurements of the total inelastic pp cross section at 7 TeV
obtained with the CMS detector. Two different methods are used. In runs with
low event pile-up, we exploit the large pseudorapidity coverage (|\eta|<5.2) of
the CMS calorimeters to obtain the cross section for events with any activity
in the acceptance range. In addition, runs with high event pile-up are used by
fitting a Poisson distribution with the total visible cross section as
parameter to the number of reconstructed primary vertices. Both measurements
are corrected to a hadron level definition of the inelastic cross section.

High Energy Physics - Experiment