IEEE 802.3x Ethernet flow control
（重定向自PAUSE frame）
IEEE 802.3x是IEEE制定在双工模式(Full Duplex)中提供流量控管的机制(Flow Control) ，相关规格已制定于 IEEE Std 802.3-2002(Annex 31B)中。
目前高性能的网络交换器皆有建置流量控管机制，当网络交换器产生拥塞时就会利用PAUSE frame 通知发送者暂缓送出封包，以减缓拥塞情况。
PAUSE frame
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Ethernet flow control IEEE 802.3x
（重定向自PAUSE frame）
Ethernet flow control is a mechanism for temporarily stopping the transmission of data on Ethernet family computer networks. The first flow control mechanism, the PAUSE frame, was defined by the IEEE 802.3x standard.
The follow-on priority-based flow control, as defined in the IEEE 802.1Qbb standard, provides a link-level flow control mechanism that can be controlled independently for each Class of Service (CoS), as defined by IEEE P802.1p. The goal of this mechanism is to ensure zero loss under congestion in data center bridging (DCB) networks.
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