Hello Mayamba,
for a C6500 with Catos 7.6
see
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/catos/7.x/command/reference/ses_sete.html#wp1026361
set boot config-register 0xvalue
he defaults are as follows:
â¢Configuration register value is 0x10F, which causes the switch to boot from what is specified by the BOOT environment variable.
â¢Baud rate is set to 9600.
â¢ignore-config parameter is disabled.
Hope to help
Giuseppe