  An effective lagrangian describing a strong interacting electroweak sector is
considered. It contains new vector and axial-vector resonances all degenerate
in mass and mixed with $W$ and $Z$. The model, for large mass of these
degenerate gauge bosons, becomes identical to the standard model in the
classical limit of infinite Higgs mass. The limits on the parameter space of
this model from future $e^+e^-$ colliders are presented.
