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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling Pause Frames

Enable Ethernet pause frames flow control on all ports on a chassis. If not, the system may exhibit unpredictable behavior.

  • NOTE: If you disable rx flow control, Dell Networking recommends rebooting the system.

The flow control sender and receiver must be on the same port-pipe. Flow control is not supported across different port-pipes. (also refer to iSCSI Optimization: Operation).

  • NOTE: After you disable DCB, if link-level flow control is not automatically enabled on an interface, to enable flow control, manually shut down the interface ( shutdown command) and re-enable it ( no shutdown command).

To enable pause frames, use the following command.

Control how the system responds to and generates 802.3x pause frames on 10 Gig ports. INTERFACE mode flowcontrol rx [ off | on] tx [ off | on] [negotiate]
  • rx on: enter the keywords rx on to process the received flow control frames on this port.
  • rx off: enter the keywords rx off to ignore the received flow control frames on this port.
  • tx on: enter the keywords tx on to send control frames from this port to the connected device when a higher rate of traffic is received.
  • tx off: enter the keywords tx off so that flow control frames are not sent from this port to the connected device when a higher rate of traffic is received.
  • negotiate: enable pause-negotiation with the egress port of the peer device. If the negotiate command is not used, pause-negotiation is disabled. 40 gigabit Ethernet interfaces do not support pause-negotiation.

The default is rx off.

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