Pause Frame

When two device started to talking to each other, And the device is full (reaches High watermark threshold, Rx Queue Buffer is full, it will start Tail dropping.

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In order to prevent the Rx Queue Buffer to stop tail dropping, Switch 2 needs to send the pause frame.

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As a result, Switch 1 will stop sending the packets.

Note: When sending the pause frame, switch 1 will pause entirely for that specified duration in the pause frame