Dell Force10 C150 Configuration Guide

452 | Interfaces
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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 platforms, Ethernet Pause Frames TX should be enabled only after
consulting with the Dell Force10 Technical Assistance Center.
On 4-port 10G line cards: Changes in the flow-control values are not reflected automatically in the show
interface output for 10G interfaces. This issue results from the fact that 10G interfaces do not support
auto-negotiation per-se. On 1G interfaces, changing the flow control values causes an automatic interface flap,
after which PAUSE values are exchanged as part of the auto-negotiation process. 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.
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
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.

Dell Force10 C150 Specifications

General

Brand	Dell
Model	Force10 C150
Category	Server
Language	English