Changing the BAUD rate on Cisco switches and routers during system recovery

Boot the Cisco switch or router into ROMMON mode.  Check your documentation on how to perform this.    On a Cisco switch, you need to disconnect power, then reconnect power, press and hold the MODE button for 10 seconds then release.

In ROMMON mode,  enter the following command:

>set BAUD 115200

Issue the SET command to confirm the setting.

>set

BAUD=115200

BOOT=flash:c3750-ipbasek9-mz.122-58.SE2.bin

CLEI_CODE_NUMBER=CNMWN00ARA

MAC_ADDR=00:12:01:C6:62:80

MODEL_NUM=WS-C3750G-48PS-S

MODEL_REVISION_NUM=A0

MOTHERBOARD_ASSEMBLY_NUM=73-9365-07

MOTHERBOARD_REVISION_NUM=A0

MOTHERBOARD_SERIAL_NUM=FOC084221W9

POWER_SUPPLY_PART_NUM=341-0108-01

POWER_SUPPLY_SERIAL_NUM=PAJ08420748

SDM_TEMPLATE_ID=0

SFP_MODULE_BOARD_ASSEMBLY_PART_NUM=73-7757-02

SFP_MODULE_BOARD_REVISION_NUM=A0

SFP_MODULE_BOARD_SERIAL_NUM=CAT08390EXQ

SWITCH_NUMBER=2

SWITCH_PRIORITY=1

SYSTEM_SERIAL_NUM=FOC0844U06H

TAN_NUM=800-25408-01

TAN_REVISION_NUMBER=A0

VERSION_ID=01

-- MORE --

Disconnect from your terminal program and reconnect to the Cisco switch/router using the new baud rate of 115200 in this example.

The allowed baud rates are 9600. 19200, 38400, 57600, 115200.  115200 bps is preferred rate for using XMODEM to transfer file to flash during a system recovery.


If you have issues, reverting back to 9600 baud , issue the commands below:


>flash_init

>delete flash:config.text

>delete flash:private-config.text

>set BAUD 9600

>set (just verify if the BAUD variable currently holds the value of 9600)

>set_bs bs: rw

>set_param

>reset


In CISCO IOS, the line baud rate can be temporarily changed as follows. Upon reboot, baud reverts to initial setting:

switch#configure terminal

switch(config)#line con 0

switch(config-line)#speed 9600

switch(config-line)#end

switch#wr

Recommend terminal application that support XMODEM are:

Tera term 4.91
ExTraPutty