Any changes to the storage configuration of the router running-config file in. If you do not enter the copy run start command after modifying the running-config, then the router reload or power down, modify the content is lost.
1. The router configuration file from the TFTP server to the router, the router can use the backup copy running-config tftp DRAM currently running configuration or copy startup-config tftp configuration stored in NVRAM backup routers.
2. Verify DRAM configuration: show running-config
NVRAM check stored configuration: show startup-config
3. Copy the configuration to a TFTP server:
Once copying files to NVRAM, by using the copy running-config tftp command to back up the file again to the TFTP server,
Router#copy running-config tftp
Address or name of remote host []?1.1.1.2
Destination filename [router-confg]?todd-confg
!!
776 bytes copied in 0.800 secs (970 bytes/sec)
4. Restore Cisco router configuration
If you have modified the router's running-config and want to restore the configuration to startup-config version, the easiest way is to use the copy startup-config running-config command. You can also use the old Cisco config mem command to restore the configuration.
Of course, before this operation only when the first copy running-config to NVRAM before modifying.
If the router is configured to copy a second backup TFTP server, may be used copy tftp running-config command or copy tftp startup-config command to restore the configuration,
Description: When copying from the TFTP server or router combined with Ge to the RAM, an interface is turned off by default, with no shutdown command must manually start each interface.