  The normal branch of Dvali-Gabadadze-Porrati braneworld gravity with brane
tension is confronted by the currently available cosmic observations from the
geometrical and dynamical perspectives. On the geometrical side, the type Ia
supernova as standard candle, the baryon acoustic oscillation as standard ruler
and the cosmic microwave background measurement from the first released 15.5
months data were used to fix the background evolutions. On the dynamical side,
the redshift space distortion data will be used to determine the evolution of
the matter perturbation. Through a Markov chain Monte Carlo analysis, we found
the dimensionless crossover scale
$\Omega_{r_c}=1/(4H^2_0r^2_{c})=0.00183_{-0.00183}^{+0.000338}$ in a spatially
flat normal branch of Dvali-Gabadadze-Porrati braneworld. This result suggests
that the crossover scale $r_c$ should be around $12H^{-1}_0$ which is
consistent with the previous result $r_c>3H^{-1}_0$ and greater. It also
implies that the five-dimensional gravity effect is weak to be observed in
$H^{-1}_0$ scale.
