Boot 3750 from tftp

Answered Question
Aug 4th, 2011

Tell me please is there any way to boot catalyst 3750 (3560, 2960) switch from tftp?

I have this problem too.
0 votes
Correct Answer by Leo Laohoo about 2 years 8 months ago
*.bin file is 20MB

Ok then.  I think I know WHY you are in this predicament.  Anyways ...

Download the IOS version 12.2(55)SE.  For a 3750 with only 16mb of flash, this version (55) is the highest you can go.  It says so in the 12.2(58)SE Release Notes.

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Average Rating: 3.2 (6 ratings)
Collin_Clark Thu, 08/04/2011 - 07:36

There really is only one way...if you're looking for suggestions, use FTP and if you're in a secure environment (which I guess you're not if you're using TFTP) use SCP.

Leo Laohoo Thu, 08/04/2011 - 18:55
I try to load IOS that is more than my Catalyst flash

Ok, then why not delete the un-necessary files so the BIN file can fit into your appliance's flash memory?

Can you post the command "dir flash:" please?

Leo Laohoo Thu, 08/04/2011 - 18:59
IOS file 20 MB

Hold on.  WHAT file are you talking about?  The TAR file (is > 16 mb) or the BIN file (<14 mb)?  You should upload the BIN file as per the link I've posted.

If you have a TAR file then use a free proggie called WinRAR to unpack it.

Correct Answer
Leo Laohoo Thu, 08/04/2011 - 19:18
*.bin file is 20MB

Ok then.  I think I know WHY you are in this predicament.  Anyways ...

Download the IOS version 12.2(55)SE.  For a 3750 with only 16mb of flash, this version (55) is the highest you can go.  It says so in the 12.2(58)SE Release Notes.

Pavel Doronin Thu, 08/04/2011 - 19:21

Long time ago i boot 2500 router directly from tftp, because ios image was bigger than flash on 2500 router and it works fine!

I try to find the way to do this on Cat3750.

Leo Laohoo Thu, 08/04/2011 - 19:24

Thanks for the ratings.

Catalyst 3750 or 3560 switches with a 16-MB flash memory can experience problems due to flash memory constraints, especially if they are using larger size images, such as c3750-ipservicesk9-tar, c3560-ipservicesk9-tar, c3750-ipbasek9-tar, or c3750-ipbasek9-tar images. These are the affected switches:

Catalyst 3560: WS-C3560-24PS and WS-C3560-48PS

Catalyst3750: WS-C3750-24PS, WS-C3750-24TS, WS-C3750-48PS, WS-C3750-48TS, WS-3750G-24T, WS-C3750G-12S, WS-C3750G-24TS, WS-C3750G-16TD

The workaround for these switches is to use the corresponding lm images, such as the c3750-ipserviceslmk9-tar or c3560-ipserviceslmk9-tar images, which require less memory. In future releases, images are expected to grow more in size, requiring more need for the lm images.

Leo Laohoo Thu, 08/04/2011 - 19:34
What is lm image? I did not see it befor.

Yes.  This is a new kind.  The "l" simply means "lite", filesize wise.  The IOS BIN file is the same but the HTML files have been cut down to fit into a 3560/3750 with 16 mb flash.

Leo Laohoo Thu, 08/04/2011 - 19:26

Long time ago i boot 2500 router directly from tftp, because ios image was bigger than flash on 2500 router and it works fine!

I try to find the way to do this on Cat3750.

If you say 3750E or 3750X there's another way to boot:  USB

Pavel Doronin Thu, 08/04/2011 - 19:43

Thanks for help!

Now i think there is no way to directly boot Cat3750 (not E and not X) from tftp.

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