TippingPoint IPS Devices
Some devices allow pause frames to pass through transparently while other devices drop the pause frames. If "Flow Control" is turned on, the device will drop the pause frames causing the network to experience latency and jitter. If this problem presents itself on your network, you will have to contact your ISP and request to turn off Flow Control.
The following platform behaviors have been verified:
N/NX-Platform - Drop pause frames
10, 110, and 330 devices pass the pause frames
Note: Putting the IPS device into L2FB does not change the behavior as the pause frames are dropped at the Broadcom chip which is where the L2FB is performed. The only way of troubleshooting this is by physically removing the device from the network.