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The globally assigned 48-bit Multicast address 01-80-C2-00-00-01 is used to send and receive pause
frames. To allow full-duplex flow control, stations implementing the pause operation instruct the MAC to
enable reception of frames with destination address equal to this multicast address.
The PAUSE frame is defined by IEEE 802.3x and uses MAC Control frames to carry the PAUSE commands.
Ethernet pause frames are supported on full duplex only.
If a port is over-subscribed, Ethernet Pause Frame flow control does not ensure no-loss behavior.
Restriction: Ethernet Pause Frame flow control is not supported if PFC is enabled on an interface.
Control how the system responds to and generates 802.3x pause frames on Ethernet interfaces. The
default is rx off tx off. INTERFACE mode. flowcontrol rx [off | on] tx [off | on]
Where:
rx on: Processes the received flow control frames on this port.
rx off: Ignores the received flow control frames on this port.
tx on: Sends control frames from this port to the connected device when a higher rate of traffic is
received.
tx off: Flow control frames are not sent from this port to the connected device when a higher rate of
traffic is received.
Changes in the flow-control values may not be reflected automatically in show interface output. To
display the change, apply the new flow-control setting, perform a shutdown followed by a no shutdown
on the interface, and then check re-display the show interface output for the port.
Enabling Pause Frames
Enable Ethernet pause frames flow control on all ports on a chassis or a line card. If not, the system may
exhibit unpredictable behavior.
NOTE: Changes in the flow-control values may not be reflected automatically in the show
interface output. As a workaround, apply the new settings, execute shut then no shut on the
interface, and then check the running-config of the port.
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.
To enable pause frames, use the following command.
• Control how the system responds to and generates 802.3x pause frames on 10 Gigabit line cards.
INTERFACE mode
flowcontrol rx [off | on] tx [off | on] [threshold {<1-2047> <1-2013>
<1-2013>}]
– 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.
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Interfaces