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New Member

"Router hangs after upgrade"

After upgrading a 4500c router from 11.2 IOS to c4500-p-mz.120-28.3.S the router hangs and gives the following message.

System Bootstrap, Version 5.2(7b) [mkamson 7b], RELEASE SOFTWARE (fc1)

Copyright (c) 1995 by cisco Systems, Inc.

C4500 processor with 16384 Kbytes of main memory

%SYS-4-CONFIG_NEWER: Configurations from version 11.2 may not be correctly under

stood.program load complete, entrypt: 0x80008000, size: 0x6002c8

Self decompressing the image : #################################################

############### [OK]

I have tried boot the old image from the tftp server without success.Any ideas anyone? Oh Yes, by the way. when I entered the show version command under 11.2 ios, It showed there was 32MB of ram. Hope that helps!

New Member

Re: "Router hangs after upgrade"


I think this is memory issue (not enough)

see from message

C4500 processor with 16384 Kbytes of main memory

while you new ios require 32 MB.

Can you try to reseat the DRAM on the 4500 ?

May be try to load old ios via xmodem the boot on it.

see following link

HTH, please rate is helps



New Member

Re: "Router hangs after upgrade"


Many thanks for your replies and help. I managed to reinstall the old ios using rommon. Please find a copy of the output from the show ver command. Maybe i have misunderstood the amount of ram installed on the unit.Hope you can help! Thanks Martin

cisco 4500 (R4K) processor (revision B) with 16384K/16384K bytes of memory.

Processor board ID 03760119

R4700 processor, Implementation 33, Revision 1.0

G.703/E1 software, Version 1.0.

Channelized E1, Version 1.0.

Bridging software.

SuperLAT software copyright 1990 by Meridian Technology Corp).

X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.

TN3270 Emulation software.

Primary Rate ISDN software, Version 1.0.

6 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

1 Channelized E1/PRI port(s)

128K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read/Write)

4096K bytes of processor board Boot flash (Read/Write)

New Member

Re: "Router hangs after upgrade"


You have only 16M DRAM

in the sh version you have 16384K/16384K. this does not mean 16+16 but 16 DRAM.

The 16 M can be used by the Main and shared DRAM.


The 4x00 platforms are shared memory routers: there is only one region of shared memory, which is shared between a single main processor and all the interface controllers. This shared memory is used for all the switching paths: fast switching and process switching.

Main DRAM: The Cisco 4000 Series runs from a Cisco IOS software image stored in main DRAM. This memory is also used by the system for tables and stacks. Therefore, the main memory is used for code space and routing data. The amount of main memory required is determined by the size of the image and by the configuration of the router.


to have 32M you should have something like :

cisco 4500 (R4K) processor (revision D) with 32768K/16384K bytes of memory.

see following link, it has interesting info :

Please rate if this answer and help.




Re: "Router hangs after upgrade"

You have kind of answered your own question , as you see it thinks it has 16 meg memory and 12.0 code takes a minimum of 32 which is why it is hanging . Couldn't tell you if you think you saw 32 before . You'll have to do a seach on the website on how to recover code on a old 4500. Might want to think about using the newer bootloader image if you haven't already , this would save you in instances like this when the regular code doesn't load , gives you more options on recovering as it is a mini IOS version .