\documentclass{report}
\usepackage{xepersian}
\begin{document}
\begin{table}
\centering
\caption{\lr{test}.}
\begin{tabular}{||rrr||}
\hline 1 &2&3\\
4 & 5& 6\\
\hline 
\end{tabular}
\end{table}
\end{document}