Clear Cisco Router Configuration to Factory reset

Router#erase startup-config
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[ OK]
Erase of nvram: complete
Router#reload
Proceed with reload? [confirm]

Auto Tuning Buffers on Cisco Router

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#buffers tune automatic
Router(config) #end
Router#

Router# show buffers tune
Tuning happened for the pool Small
Tuning happened at 22: 43: 19
Oldvalues
permanent: 50 minfree: 20 maxfree: 150
Newvalues
permanent: 62 minfree: 15 maxfree: 78
Tuning happened for the pool Middle
Tuning happened at 22: 43: 19
Oldvalues
permanent: 25 minfree: 10 maxfree: 150
Newvalues
permanent: 36 minfree: 9 maxfree: 45
Router#

Disabling Cisco Discovery Protocol (CDP) on Cisco Router

Disable per interface:

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config) #cdp run
Router(config) #interface FastEthernet0/0
Router(config-if) #no cdp enable
Router(config-if) #end
Router#

Disable globally:

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config) #no cdp run
Router(config) #end
Router#