cnosPortSpeedAdmin 1.3.6.1.4.1.9.10.43.1.3.1.1.5

Set to tenMbps(1) to operate in 10Mbps speed mode. Set to oneHundredMbps(2) to operate in 100Mbps speed mode. Set to autoNegotiate(3) to allow the switch to negotiate with the other end of the connection.