10 GB fiber problem

Hardware MikroTik hardware general
1

Hi,


I have RB4011iGS+ with sfpplus interfaceon one, and CRS305-1G-4S+ with 4 sfpplus interfaces on the other side.

Between them there are two Finisar FTLX8571D3BCL sfp modules (all info I can get says that it is 10G capable) and HP 3PAR 10G 10m (pn 850-200029) blue fiber cable with llc connectors, which is also declared to be 10GB capable.

Bandvwidth test between routers peaks with 2GB for a second or two and settles at slightly above 1GB at the best !


Can anyone tell what could be the problem?

regards

2

The problem is bandwidth test, consume both CPU.
Use another method with two device that generate traffic on both side, and CPU is not involved.

3

Hi,

I knew that, but somehow I expected more than 1 Gbit. Especially confusing was the fact that the throughput was exactly 1 Gbit so I suspected that something is wrong with router, switch, cable... etc.
Anyway I have just setup two older supermicro servers (x8STI) with ubuntu 22..., Mellanox 10 Gb interfaces, Chelsio SFP-s and voila 10 Gbit (allmost) transfer is achieved.

So, you were right... regards

4

Also please be in mind that not both devices are Routers, CRS305-1G-4S+IN is a switch with L3 capabilities!

5

try

traffic-generator tool

6

ok, and how does this fact affect the problem i have described?

7

on linux?

8

Hi

iperf / iperf3 could help you with linux test. Use enought threads.

Best Regards,

Diego

9

.this is exactly what I have used… :+1: