The BSE benchmark Sensex rallied by 269 points in opening trade today following the cash reserve ratio cut by the Reserve Bank of India, RBI on Friday. The 30-share index, which had gained nearly 357 points in the previous session, rose by 269 points, or 1.54 per cent, to 17,772 in opening trade today.In a similar fashion, the broad-based National Stock Exchange Nifty index gained 88 points, or 1.54 per cent, to 5,422.