Dell Force10 S4810P - Enable Pause Frames

Interfaces | 507
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) 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 supports only the rx control option. The S4810 does 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: rx off
Parameters:
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.
threshold (C-Series and S-Series only): When tx on is configured, the
user can set the threshold values for:
Number of flow-control packet pointers: 1-2047 (default = 75)
Flow-control buffer threshold in KB: 1-2013 (default = 49KB)
Flow-control discard threshold in KB: 1-2013 (default= 75KB)
Pause control is triggered when either the flow control buffer threshold
or flow control packet pointer threshold is reached.