Cannot Connect To A Switch Through The Console Port - Cisco Catalyst 9404R Switch Hardware Installation Manual

Troubleshooting

Cannot Connect to a Switch Through the Console Port

Make sure you are using the correct type of cable and that the cable pinouts are correct for your supervisor
module
Make sure the terminal configuration matches the switch console port configuration—default console port
settings are 9600 baud, 8 data bits, no parity, 1 stop bit.
To access the switch through the console port, the following must match
• The BAUD environment variable in the ROMMON
• Console port speed
• Start-up configuration
Note The factory default for the the BAUD environment variable is an explicit setting: BAUD variable=9600. This
variable also defaults to 9600 (implicit setting) when a variable is not set explicitly.
During initial switch configuration, proceed as follows:
1. Ensure that the terminal configuration matches the switch console port speed configuration. The following
example uses a Cisco switch as the console, and the console port number is 8. Enter the appropriate console
port number when you configure the console port speed.
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)#line 8
Switch(config-line)# speed 9600
2. Access ROMMON prompt and verify the BAUD setting on the switch—Connect the console to system
and while system is booting, after you see the the prompt, press CTRL+C to stop booting and access
ROMMON prompt. In the example, the factory default setting is retained.
rommon 1> set
BAUD=9600
<output truncated>
If you want to change this setting, you can do so now
rommon 2> set BAUD <enter new speed>
If you enter a new speed, you must redo step 1 because you will lose ROMMON access immediately after
setting a new speed.
3. Boot the image.
rommon 4> boot
During bootup, the BAUD rommon setting on the active supervisor is automatically synced to the standby.
4. Save the running configuration:
Switch# copy system:running-config nvram:startup-config
When the BAUD rommon variable is set in ROMMON mode, this value is extracted for the line console
in the running configuration, when the system reloads. However, when the system parses the
startup-configuration, the startup-configuration speed supercedes the value retrieved from BAUD. This
Cannot Connect to a Switch Through the Console Port
End with CNTL/Z.
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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