HANOI, Nov. 13 (Xinhua) -- Vietnam's central bank on Tuesday adjusted up its reference exchange rate between Vietnamese dong and U.S. dollar by 2 Vietnamese dong to 22,727 Vietnamese dong per U.S. dollar.

With the current trading band of plus or minus 3 percent, the ceiling exchange rate is 23,409 Vietnamese dong per U.S. dollar, and the floor rate is 22,045 Vietnamese dong per U.S. dollar, said the State Bank of Vietnam.

Meanwhile, listed rates at big commercial banks in Vietnam advanced fairly from Monday. BIDV and Vietcombank raised the rates up by 10 Vietnamese dong, buying the greenback at 23,255 Vietnamese dong per U.S. dollar and selling at 23,345 Vietnamese dong per U.S. dollar.

Last week, the reference exchange rates saw two ups and three downs with total magnitude of 4 Vietnamese dong and 6 Vietnamese dong, respectively.

According to the central bank, as of June 11, the reference exchange rate rose 0.63 percent against the end of 2017, while the average rate offered by commercial banks advanced 0.47 percent.