Today will be gap up opening expected in banknifty. Possible it will open near 50450 level. After opening it will face immediate resistance at this level and expected downside from this level upto 50050 and this downside can extend for further 400-500+ points in case banknifty starts trading below 49950 level. Any upside rally only expected if banknifty starts trading and sustain above 50550 level.