Dell S4820T, Configuration Manual

Page: 465 / 1178

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, shutdown the interface using the
shutdown
command, enable the interface using the
no shutdown
command, and use the
show interface
command to verify the changes.
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 1 and 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.
Interfaces
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