User Manual

TRex 11 / 113
Chapter 3
First time Running
3.1 Configuring for loopback
Before connecting TRex to your DUT, it is strongly advised to verify that TRex and the NICs work correctly in loopback.
Note
1. For best performance, loopback the interfaces on the same NUMA (controlled by the same physical processor). If you
are unable to check this, proceed without this step.
2. If you are using a 10Gbs NIC based on an Intel 520-D2 NIC, and you loopback ports on the same NIC using SFP+, the
device might not sync, causing a failure to link up.
Many types of SFP+ (Intel/Cisco/SR/LR) have been verified to work.
If you encounter link issues, try to loopback interfaces from different NICs, or use Cisco twinax copper cable.
Loopback example
3.1.1 Identify the ports
Use the following command to identify ports.
[bash]>sudo ./dpdk_setup_ports.py -s
Network devices using DPDK-compatible driver
============================================
Network devices using kernel driver
===================================
0000:03:00.0 ’82599ES 10-Gigabit SFI/SFP+ Network Connection’ drv= unused=ixgb #
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