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Cisco IOS Upgrade

All these tasks have been done in production environment. I upgraded almost 50 switch IOS in production environment. In my case I don't removed working IOS from the 2950 switch. You may encounter low flash memory during the up-gradation of the new IOS. If that happen do see at the bottom of this tutorial where I had mention how to recover some more space for IOS up-gradation.

Step1:
Fist of all create tftp server in one of the updated IOS switch.
sw2(config)#tftp-server c2950-i6k2l2q4-mz.121-22.EA14.bin

Step2:
Then go to the remote switch where you want to upgrade IOS with new version.

sw1#copy tftp: flash:
Address or name of remote host [100.100.255.47]?
Source filename [100.100.255.47]? c2950-i6k2l2q4-mz.121-22.EA14.bin
Destination filename [c2950-i6k2l2q4-mz.121-22.EA14.bin]?
Accessing tftp://100.100.255.47/c2950-i6k2l2q4-mz.121-22.EA14.bin...
Loading c2950-i6k2l2q4-mz.121-22.EA14.bin from 100.100.255.47 (via Vlan2): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 3722814 bytes]

3722814 bytes copied in 143.124 secs (26011 bytes/sec)

Step3.
Check your copied IOS in the switch.

sw1(config)#do dir flash:
Directory of flash:/

    2  -rwx         864  Mar 01 1993 05:45:31 +05:45  vlan.dat
    3  -rwx       13499  Sep 23 2014 22:17:39 +05:45  config.text
    4  -rwx        1952  Sep 23 2014 22:17:39 +05:45  private-config.text
    5  -rwx     3722112  Mar 01 1993 07:33:24 +05:45  c2950-i6k2l2q4-mz.121-22.EA12
    6  -rwx        5871  Mar 01 1993 06:18:00 +05:45  sw1-config
    7  -rwx          43  Mar 01 1993 07:37:36 +05:45  env_vars
    8  -rwx     3722814  Sep 24 2014 12:30:41 +05:45  c2950-i6k2l2q4-mz.121-22.EA14.bin
  305  -rwx        5168  Mar 01 1993 08:37:25 +05:45  running-config1
  306  -rwx        1048  Sep 23 2014 22:17:39 +05:45  multiple-fs

7741440 bytes total (263680 bytes free)

Step5.
Verify the IOS if corrupted while copying form remote system to the destination system.

sw1#verify /md5 flash:c2950-i6k2l2q4-mz.121-22.EA14.bin
.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Done!
verify /md5 (flash:c2950-i6k2l2q4-mz.121-22.EA14.bin) = 8d3250ee253b81b7fe2762e281773fbc

Step6.
Now boot system

sw1(config)#boot system c2950-i6k2l2q4-mz.121-22.EA14.bin

Step7.
Write into the memory, otherwise your system may not boot from the new IOS or if you removed working IOS you system may not found any IOS.

sw1#wr memory
Building configuration...
[OK]

sw1#reload
System configuration has been modified. Save? [yes/no]: y
Building configuration...
[OK]

Step8.
Now check your system boot from new IOS

sw1#sh ver | inc image
System image file is "flash:/c2950-i6k2l2q4-mz.121-22.EA14"
Proceed with reload? [confirm]


How to recover extra space in 2950 switch.

In case you may have little space in switch, your new IOS have "3722814" size and switch only left "2220544" bytes free, in my case I don't need html file so I delete it form the switch.
sw1#dir flash:
Directory of flash:/

    2  -rwx     3722112  Apr 08 2013 11:13:12 +05:45  c2950-i6k2l2q4-mz.121-22.EA12
    3  -rwx         796  Mar 01 1993 05:45:28 +05:45  vlan.dat
    4  drwx        4224  Mar 14 2008 11:52:14 +05:45  html
   79  -rwx        1048  Sep 23 2014 17:05:12 +05:45  multiple-fs
   81  -rwx       12534  Sep 23 2014 17:05:12 +05:45  config.text
   83  -rwx        1958  Sep 23 2014 17:05:12 +05:45  private-config.text

7741440 bytes total (2220544 bytes free)

sw1#delete /f /r flash:html
Delete filename [html]? 
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