HP ProCurve 6400cl Series Management And Configuration Manual page 206

Port Status and Basic Configuration
Viewing Port Status and Configuring Port Parameters
Figure 10-7. Example of Configuring Flow Control for a Series of Ports
10-12
For example, suppose that:
1. You want to enable flow control on ports A1-A6.
2. Later, you decide to disable flow control on ports A5 and A6.
3. As a final step, you want to disable flow control on all ports.
Assuming that flow control is currently disabled on the switch, you would use
these commands:
Enables global flow control.
Enables per-port flow control
for ports A1 - A6.