Reference Guide

Interfaces | 471
Enable Pause Frames
Ethernet Pause Frames flow control must be enabled on all ports on a chassis or a line card. If not, the
system may exhibit unpredictable behavior.
On the C-Series and S-Series systems, the flow control sender and receiver must be on the same port-pipe.
Flow control is not supported across different port-pipes on the C-Series or S-Series system
.
Note: On the C-Series and S-Series (non-S4810 or S4820T) platforms, Ethernet Pause Frames TX
should be enabled only after consulting with the Dell Force10 Technical Assistance Center.
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 followed by no shut on the interface, and then
check the running-config of the port.
Note: The S4810 and S4820T support only the rx control option. The S4810 and S4820T do not transmit
pause frames.
Note: If rx flow control is disabled, Dell Force10 recommends rebooting the system.
Command Syntax Command Mode Purpose
flowcontrol rx [off | on] tx [off | on] [threshold
{<1-2047> <1-2013> <1-2013>}]
INTERFACE Control how the system responds to and
generates 802.3x pause frames on 1 and 10Gig
line cards.
Defaults:
C-Series: rx off tx off
E-Series: rx on tx on
S-Series: rx off tx off
S4810 and S4820T: rx off