  We review main features of the pure $\mathcal N=1$, $D=4$ SYM and its
effective description by the Veneziano-Yankielowicz generalized sigma-model. We
then indicate that the construction of BPS domain walls interpolating between
different SYM vacua requires the presence of a dynamical membrane source. We
will show how such a membrane is coupled to the SYM and present the explicit
form of BPS domain walls which it creates in the Veneziano-Yankielowicz
effective theory. In particular, we will describe 1/2 BPS domain wall
configurations with $|k|\leq N/3$, where $k$ is the membrane charge that sets
the "distance" between two distinct SUSY vacua.
