MAC control opcode for a Priority pause frame is 0x0101. Unlike the original pause, Priority pause indicates the pause time in quanta for each of eight priority classes separately. The extension was subsequently standardized by the Priority-based Flow Control (PFC) project authorized on March 27, 2008, as IEEE 802.1Qbb. Draft 2.3 was proposed on June 7, 2010. Claudio DeSanti of Cisco was editor. The effort was part of the data center bridging task group, which developed Fibre Channel over Ethernet. See also Explicit Congestion Notification References External links Linux Tool for generating flow control PAUSE frames Python Tool to Generate PFC Frames IEEE 802 Ethernet standards Flow control (data)