booting problem with serial console attached

RouterOS General
1

I have observed a situation when two mikrotik devices are connected with a rollover serial cable and device1 is rebooted, it is subsequently unable to boot and the other device (device2) receives the following messages in terminal:

09:55:04 echo: system,error,critical login failure for user .2 via local
[admin@CRS309] >
09:55:05 echo: system,error,critical login failure for user boot over Ethernet via local
[admin@CRS309] >
09:55:06 echo: system,error,critical login failure for user What do you want to configure? via local
[admin@CRS309] >
09:55:07 echo: system,error,critical login failure for user via local
[admin@CRS309] >
09:55:08 echo: system,error,critical login failure for user boot over Ethernet via local
[admin@CRS309] >
09:55:09 echo: system,error,critical login failure for user OT-6.48.2 via local
[admin@CRS309] >
09:55:10 echo: system,error,critical login failure for user Select boot device: via local
[admin@CRS309] >
09:55:11 echo: system,error,critical login failure for user boot from NAND only via local
[admin@CRS309] >


So in order for device1 to boot, device2 has to:

  • /system console disable 0
  • /system serial-terminal serial0 (and type x to continue boot process)


    So if I want to successfully reboot device1, i need to disable console on device2. Otherwise device1 is stuck in the boot process.


    Is that a known problem? are there any configuration options that would prevent this type of behaviour?
2

Possibly wrong connection sequence or wrong synchronization of two devices. Try to search the settings for synchronization.

3

NO, the problem is the use
On boot second serial receive the video output of bios, the second RB can interpret it as commands for login.
All is exactly go as expected

Simply paste

/sys routerboard settings
set enter-setup-on=delete-key

on both routerboard for not have problem on boot,
but error on log still happen.

4

Thanks. setting the "enter-setup-on=delete-key" fixed the issue.