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S5720-28X-LI-24S-AC console issue

Publication Date:  2018-02-10 Views:  157 Downloads:  0
Issue Description

CLI responds very slow when using console port, each character takes about 30 seconds to reach the switch.

This issue happens on all S5720-28X-LI-24S-AC

Software version: V200R10 with SPH008

Handling Process

1.    1.First check the terminal used to have the correct settings:

Baud rate 9600

Data bits 8

Parity None

Stop bits 1

2.     2.Second tested on different devices with same cables, we noticed that it works well, the issue appears only on the new S5720-28X-LI-24S-AC switches, we tested 4 of same model and they all had this issue.

3.    3.We tested logging in via web-gui and telnet/ssh and we do not encounter any delay using this method.

4.    4.We tested on different operating system, Windows and Ubuntu but the issue appears no matter the OS or Terminal used.

5.    5.We tested with different console cables and found that the issue is regarding compatibility with Prolific PL-2303RA chipset.

Root Cause

heThis is a  compatibility issue between  Prolific PL-2303RA chipset on serial cable and our S5720-28X-LI-24S-AC switch


With the FTDI - FT232RL chipset everything works fine.