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New Member

IOS version for upgrade path?

This is probably a basic question for most, but looking at all of the ios releases that are available I am not sure which one I should use. Just to verify, here is what I believe is the correct moves to get my boxes up to a current release-

4510(SupV): 12.2(20)EWA to 12.2.25-EWA7?

3560: 12.2(25)SEB2 to 12.2(35)SE1

2950's: 12.1(22)EA2 to 12.1(22)EA8a




Re: IOS version for upgrade path?


I agree with you on this.The IOS that you have mentioned are the latest one in their respective train. Untill and unless you have some new hardware or software feature requirement always be in the same train.

For 4500 12.2.25.EWA7 is the latest in its 12.2.EWA train.

For 3560 the latest is 12.2.35SE1

For 2950 the latest IOS is 12.1.22EA9

HTH,Please rate if it does.

-amit singh

New Member

Re: IOS version for upgrade path?

thanks amit.

For the 2950 EA8a release, the file size is 5

MBs including the devman files. My switch only has 1.5 MBs free. I am assuming that I need to remove the existing image to free up enough room, but if something doesn't go well I won't have an image to boot from. Am I missing something here related to the file sizes and space? Here is a look at one of them-

Directory of flash:/

2 -rwx 3094338 Mar 01 1993 01:40:29 +00:00 c2950-i6q4l2-mz.121-22.EA3.bin

3 -rwx 5 Jun 30 2006 18:41:43 +01:00 private-config.text

4 -rwx 404 Mar 01 1993 01:42:54 +00:00 env_vars

5 -rwx 6226 Jun 30 2006 18:41:43 +01:00 config.text

6 -rwx 2536 Dec 04 2006 14:29:17 +00:00 vlan.dat

7 -rwx 110 Mar 01 1993 00:01:48 +00:00 info

8 drwx 2688 Mar 01 1993 00:05:46 +00:00 html

90 -rwx 110 Mar 01 1993 00:05:49 +00:00 info.ver

7741440 bytes total (1542144 bytes free)

Re: IOS version for upgrade path?


As far as I know, you will have to remove existing image.

I have done many, you will have no problem as long as you do not loose power during this process. So make sure no intruption to power.

If you are not using http server for switch management then I suggest you remove html director to free up FLASH.



New Member

Re: IOS version for upgrade path?

I upgraded all of the switches last night, now I just have one more question. The ROM rev on my 4510 is 12.1(20r)EW1. According to the release notes for the 12.2(25)EWA7 ios, that is the minimum and is ok but the recommended is the 12.2(31r)SGA release. Should I also upgrade that, or leave it where it is?

thanks again for the information,


Cisco Employee

Re: IOS version for upgrade path?


Please go ahead and upgrade the rommon on the switch to eliminate any future incompatibility.


-amit singh