Banknifty is on NSE, on BSE the bank index is called Bankex.
Presently the liquidity is only on Sensex options on BSE, that too only put options. :)
This is the market summary for 21th Nov
|Type of Instrument||Contracts Traded||No. of Trades||Turnover (Cr)||OI (No. Of Contracts)||OI Value (Lacs)|
|Index Option (Call)||1,50,286||1,452||6,500.19||8,339||354|
|Index Option (Put)||61,01,269||80,945||2,51,390.32||5,707||242|
|Equity Option (Call)||1,128||46||29.08||232||6|
|Equity Option (Put)||902||65||26.59||32|