Nexus 3064 - LACP issue with bandwidth

[DeviC3]

Hello, I have Nexus 3064 and configured on it a lacp link with DCN switch.

Configuration is same on both switches. When I'm trying to set a speedtest (iperf) beetwen two Linux servers.

Links is 2x10Gb/s on both sides. On DCN side it shows me 20Gb/s bandwitdth but on Nexus side it shows BW as 20000000 Kbit and full-duplex, 10 Gb/s.

Iperf on Linux shows bandwidth as 5Gb/s and lacp didn't work. Below important Nexus Config

port-channel1 is up
  Hardware: Port-Channel, address: 1111.1111.1111(bia 1111.1111.1111)
  Description: Some secret description
  MTU 1500 bytes, BW 20000000 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA
  Port mode is trunk
  full-duplex, 10 Gb/s
  Input flow-control is off, output flow-control is off
  Switchport monitor is off
  EtherType is 0x8100
  Members in this channel: Eth1/47, Eth1/48

[Sergiu.Daniluk]

Do you generate a single flow or multiple concurrent flows for the tests in iperf?

[DeviC3]

Hi, sorry for long time.

multiple flows from 2 different clients to 2 different servers, additionaly iperf is set with parameter -p 10 (paralel)
[client1] <-10Gbps-> [Nexus <-> DCN 2x 10Gbps LACP] <-10Gbps-> [iperf-server1]
[client2] <-10Gbps-> [Nexus <-> DCN 2x 10Gbps LACP] <-10Gbps-> [iperf-server2]
Everything in same subnet eg. 192.168.100.0/24 if this can make difference.