NetXtreme-UG100
56
NetXtreme-C/NetXtreme-E
User Guide
16.6 Configuration Functions
The testpmd application can be configured from the runtime as well as from the command line. This section describes the
available configuration functions that are available.
csum set – Selects the hardware or software calculation of the checksum when transmitting a packet using the csum
forwarding engine: testpmd> csum set (ip|udp|tcp|sctp|outer-ip) (hw|sw) (port_id).
17 Frequently Asked Questions
Does the device support AutoNeg at 25G speed?
Yes. Refer to
“Auto-Negotiation Configuration” on page 24
for more details.
How would I connect SFP28 cable to QSFP ports?
Breakout cables are available from QSFP to 4xSFP28 ports.
What are the compatible port speeds?
For BCM57404AXXXX/BCM57414 dual-port devices, the port speed of each port must be compatible with the port speed
of the other port. 10 Gb/s and 25 Gb/s are not compatible speed. If one port is set to 10 Gb/s the other port can not be
set to 25 Gb/s. If a user attempts to set incompatible port speeds, the second port to be brought up does not link. Refer
to
“Auto-Negotiation Configuration” on page 24
for more details.
Can I use 10 Gb/s for PXE connectivity on a 25 Gb/s port?
Currently only 25 Gb/s PXE speed is supported. It is not recommended to use 10 Gb/s PXE connectivity on a 25 Gb/s
adapter. This is due to the lack of support for auto negotiation on existing 10 Gb/s switches and possible complications
caused by incompatible port link speed settings.
