Switch# copy running-config tftp://<IPADDRESSS>
<enter>
<enter>
exit
Example:
SWITCH-1#copy running-config tftp://10.101.245.254
Address or name of remote host [10.101.245.254]?
Destination filename [SWITCH-1-confg]?
!!
17180 bytes copied in 0.934 secs (18394 bytes/sec)