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Reference Guide

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Interfaces | 445
The following error message appears when trying to enable flow control when half duplex is already
configured:
Can’t configure flowcontrol when half duplex is configure, config ignored.
The following error message appears when trying to enable half duplex and flow control configuration is
on:
Can’t configure half duplex when flowcontrol is on, config ignored.
Threshold Settings
Threshold Settings are supported only on platforms: c s
When the transmission pause is set (
tx on), 3 thresholds can be set to define the controls more closely.
Ethernet Pause Frames flow control can be triggered when either the flow control buffer threshold or flow
control packet pointer threshold is reached. The thresholds are:
• 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)
The pause is started when
either the packet pointer or the buffer threshold is met (whichever is met first).
When the discard threshold is met, packets are dropped.
The pause ends when
both the packet pointer and the buffer threshold fall below 50% of the threshold
settings.
The discard threshold defines when the interface starts dropping the packet on the interface. This may be
necessary when a connected device doesn’t honor the flow control frame sent by S-Series.
The discard threshold should be larger than the buffer threshold so that the buffer holds at least hold at least
3 packets.
Enable Pause Frames
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.