The two Cisco routers upgrade each other to IOS

This article mainly introduces how to upgrade two PCs to a Cisco router IOS. How can we do this? The following article will give you a detailed introduction.

I have a 2501 router whose IOS is a bad cisocB), another 2501 router whose IOS is a good (ciscoA), and a good IOS is no longer available on my PC, however, it is a waste of time to create a TFTP file on the PC and upload the file to the PC ,. Then I thought of a way to directly configure the vro as a TFTP server. My connection method is that the two routers are connected through the E0 port. I first set the E0 port to 192.168.10.90 (the IP address is randomly configured, as long as the two E0 ports can PING each other on the line) and then to the configuration mode input tftp-server c2500-js-l.122-7a.bin this is the IOS file name in your IOS, use show version to view your IOS file name.

After this A has been configured, go to B to configure it. First, let this start to BOOT mode. In Global configuration mode, enter config-register 0x2101 and then restart the router, after BOOT to BOOT mode, configure your E port. After BOOT Mode, enter copy tftp flash, and prompt you to enter the TFTP server, and then enter the file name,
The procedure is as follows:
CisocA # conf t
CisocA (config) # tftp-server c2500-js-l.122-7a.bin
CisocA (config) # int e0
CisocA (config-if) # ip add 192.168.10.90 255.255.255.0
CisocA (config-if) # no shut
CiscoB (config) # conf t
CiscoB (config) # config-register 0x2101
CiscoB (config) # end
CiscoB # reload
System configuration has been modified. Save? [Yes/no]: y
CiscoB (boot)> enable
CiscoB (boot) # conf terminal
CiscoB (boot) (config) # int e0
CiscoB (boot) (config-if) # ip add 192.168.10.80 255.255.255.0
CiscoB (boot) (config-if) # no shut
CiscoB (boot) (config-if) # end
CiscoB (boot) # erase flash
System flash directory:
File Length Name/status
1 15533612 c2500-js-l.122-7a.bin
[15533676 bytes used, 1243540 available, 16777216 total]
Erase flash device? [Confirm]
Are you sure? [Yes/no]: y
Address or name of remote host [192.168.10.80]? 192.168.10.90
Source file name? C2500-js-l.122-7a.bin
Destination file name [c2500-js-l.122-7a.bin]?
Erase flash device before writing? [Confirm] Press ENTER)
Copy ''c2500-js-l.122-7a.bin ''from server
As ''c2500-js-l.122-7a.bin ''into Flash WITH erase? [Yes/no] y
After entering Y, the program will automatically copy ios. After successful completion, you will configure the following:
CiscoB (config) # config-register 0x2102
CiscoB (config) # reload
The procedure is complete.