How to upgrade Cisco switch IOS

Check existing version

SW1# show version

Check existing boot location

SW1# show boot

Backup existing version

SW1# copy flash:c3750-ipbasek9-mz.122-25.SEE3.bin tftp:

Download new IOS and verify MD5

SW1# copy tftp flash
SW1# dir flash:
SW1# verify /md5 flash:c3750-ipbasek9-mz.122-25.SEE3.bin

Get-FileHash on Windows

dir
Get-FileHash <filepath> -Algorithm MD5
Get-FileHash .\c3750-ipbasek9-mz.122-55.SE12.bin -Algorithm MD5

Ask switch to boot from new file

SW1(config)# boot system flash:NewVersion.Bin
SW1(config)# do show boot
SW1(config)# do wr mem
SW1(config)# do reload

After successful reload, delete old IOS

SW1(config)# show flash
SW1(config)# delete flash:OldFile.Bin

 

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