MSN3420: console connection through cisco C1100TG

Infrastructure & Networking Switches and Gateways Ethernet Switches
1

Hi,

i’m trying to connect to the switch through cisco console terminal gw and getting garbled characters:
ÿ~[Qîz^^ì~ÁUøjZîz^^ì~ÁUøjZ{~[Qîz^^ì~ÁUøjZ~[Qîz^^ì~ÁUøjZ—[pzjalQÁUøjZn{êUzpzjalQÁUøjZn{êUzpzjalQÁUøjZÄ{êUzpzjalQÁUøjZa{êUzpzjalQÁUøjZ{{û

configured the setting as recommended but still no change, any ideas?

settings:
Baud rate (TX/RX) is 115200/115200, no parity, 1 stopbits, 8 databits

Status: Ready

Capabilities: EXEC Suppressed

Modem state: Ready

Modem hardware state: noCTS noDSR DTR noRTS

Special Chars: Escape Hold Stop Start Disconnect Activation

            ^^x    none   -     -       none

Timeouts: Idle EXEC Idle Session Modem Answer Session Dispatch

           00:10:00        never                        none     not set

                        Idle Session Disconnect Warning

                          never

                        Login-sequence User Response

                         00:00:30

                        Autoselect Initial Wait

                          not set
2

Hi Amer,

If you have garbled characters it is almost always a result of mismatched speeds.
This is the default but in certain cases it could change:

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image1082×850 30.6 KB

CF - System Bring-Up - NVIDIA Docs

*If you connect your laptop w/serial console directly to the switch do you have the same issue?
*Can you test different baud rates? (The NOS you are running can actually support different baud rates and it could have changed.)
*If possible power drain the switch. (remove power / not just reboot)
*I am assuming you don’t have ssh access yet but if you do you can restart the agetty process within the Cumulus Linux. (systemctl restart serial-getty@ttyS0.service) Assuming you are running Cumulus.
*While rare, it is possible the serial port is bad.
*If you are using a long UTP cable that will also introduce noise. RS232 is less reliable in proportion to data rate + cable length.

I hope this helps.
If more help is needed likely you will need to open a ticket with support.

Charles

3

Hi Charles,

Thank you for your respond, it was indeed the speed, I’ve tried several baud rate until it works on speed 38400 :)

Thanks and have a good day

Aiman

4

Glad to hear!

Charles