Upgrading a 3825 ISR from 12.4 to 15

[Kevin Melton]

What are the prerequisites before doing this?  I have to upgrade a router this Wednesday evening if there is an opportunity to move it to a code that is more current that the one the client is currently running which is 12.4(25b).  I see on the Cisco Support site that after this code, everything moves to 15.

If someone could publish what I would need to do to the router in order to move it to 15 it would be appreciated.

Thank You

Kevin

[Richard Burts · Accepted solution]

Kevin

The steps to prepare are ones you usually would take and include:

- verify that the router has at least the minimum amount of memory and flash. (looks like minimums are 512 MB memory and 128 MB flash)

- check release notes for anything significant about the release, focusing on unresolved issues. Also look for references about changes in syntax of commands.

- select the version and feature set that you want to install.

- download the code from Cisco.

- stage the code onto the router and modify any needed boot parameters.

HTH

Rick

Sent from Cisco Technical Support iPhone App

[Reza Sharifi · Accepted solution]

Kevin,

To move to IOS 15, you need to have at least 256MB of memory and 256MB of flash.

IOS 15 is all licensed based with a universal image.  So, if you need any additional feature the does not come with

the base image, you need to buy a license for it.

HTH

Reza

[Michael Odom]

I don't believe the 28xx/38xx uses the license key, so you don't need to purchase a license.  Just download the image with the same feature set you currently have just like you do with the 12.4 code releases.  I've upgrade a few dozen of my 2821 and 3845's and they don't use the license.  If you are upgrading your feature set (e.g. IP SERVICES to ADVANCED ENTERPRISE SERVICES), then you are "required" to purchase an upgrade license.  However, all you get is a piece of paper you stick in a drawer.

When you have a 28xx or 38xx on version 15, you'll see somem reference to the license, but it will remain blank.  The box will operate with the feature set you load on it:

XXXXX>sho ver
Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 15.1(1)XB,                                                RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 21-Dec-09 03:52 by prod_rel_team

Cisco 3845 (revision 1.0) with 478208K/46080K bytes of memory.
Processor board ID FTX1324AHVR
2 Gigabit Ethernet interfaces
4 Channelized E1/PRI ports
1 Virtual Private Network (VPN) Module
16 Voice E & M interfaces
DRAM configuration is 64 bits wide with parity enabled.
479K bytes of NVRAM.
255488K bytes of ATA System CompactFlash (Read/Write)

...

License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        CISCO3845-MB          FOCXXXXXXXXXX

Configuration register is 0x2102

The 29xx and 39xx, however, do use the common image and the license, and you will see

sho ver
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport

License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        C3900-SPE100/K9       FOCXXXXXXXXX

Technology Package License Information for Module:'c3900'

----------------------------------------------------------------
Technology    Technology-package          Technology-package
              Current       Type          Next reboot
-----------------------------------------------------------------
ipbase        ipbasek9      Permanent     ipbasek9
security      None          None          None
uc            uck9          Permanent     uck9
data          None          None          None

Configuration register is 0x2102

[Ricardo Velazquez]

where there any syntax diffrences from 12.4 to 15 code to be aware of, I can not see much in the release notes for 15.1M on the IOS software page.

[Richard Burts]

I am sure that there are at least a few things in syntax that are different in 15 code. But there is not anything that occurs to me now that is particularly significant in terms of changed syntax.

HTH

Rick

[Joseph W. Doherty]

Disclaimer

The   Author of this posting offers the information contained within this   posting without consideration and with the reader's understanding that   there's no implied or expressed suitability or fitness for any purpose.   Information provided is for informational purposes only and should not   be construed as rendering professional advice of any kind. Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In   no event shall Author be liable for any damages whatsoever (including,   without limitation, damages for loss of use, data or profit) arising  out  of the use or inability to use the posting's information even if  Author  has been advised of the possibility of such damage.

Posting

There are some/few minor syntax changes, and when upgrading, 15 will normally accept 12.4 syntax and automatically revise it.  The only issue you might bump into, if for any reason you needed to revert to 12.4, 12.4 wouldn't understand revised 15 syntax.  (So, save a 12.4 config copy.)

[Richard Burts]

Reza

The licensing in 15 is a unique aspect that I did not mention. So thanks for filling that in.

I checked the software download page for 15.1(2)GC and it clearly identifies the memory and flash requirements for the 3825 as 512 MB memory and 128 MB flash.

HTH

Rick

[Reza Sharifi]

Rick,

Thanks for clarify that.  You are correct, 128 flash is enough 

Mike,

Great info.

That is what I was trying to say.  If you are upgrading your feature set legally, you need to purchase a license

Thanks,

Reza