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DC1966
Beginner

Catalyst 3750G can not connect via terminal/console port

I have two 3750G switches, one I can connect to via the terminal/console port using Putty, the other I can not. I have connected a couple of servers and PCs to the troublesome switch and it works OK. Does anyone have suggestions why I can not establish a connection with this switch? I have tried all the baud rates but it still does not connect. Are there license or OS issues I need to be aware of? The other switch connects no problem so I know the connecting setup is working.

4 REPLIES 4
Giuseppe Larosa
Hall of Fame Master

Hello @DC1966 ,

is the switch configured for allowing telnet or SSH connections ?

 

In some cases for software bugs that cause memory leakage a switch can be so bussy that it can not allocate memory for a telnet/SSH session or even a console session.

If you can try to reboot the switch and try again.

if the problem is a memory leakage it takes many hours of uptime to consume the memory.

 

Hope to help

Giuseppe

 

DC1966
Beginner

Making this post to close this question:

Decided to open the switch to see if there was an obvious mechanical or electrical reason the console port was not working. Discovered a small chip adjacent to the port badly burnt.

Hello @DC1966 ,

thanks for your feedback!  so it was an hardware issue the chip that was burnt is probably the UART that manages the console async serail port.

 

Hope to help

Giuseppe

 

Hello

Thank you for the feedback, I have never come across such a problem as this before regarding the root cause is hardware pertaining to the console port, so good to know.



kind regards
Paul

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