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New Member

Cisco 4000 boot issues

Hopefully this topic belongs here. I have a Cisco 4000 series router that is having problems booting. (sigh...OK, I bought it on eBay. Its the first time I have had a problem with a router bought on eBay and I am attempting a fix before returning it)

When the router attempts to boot, it crashes due to apparently insufficient DRAM memory. See capture below:

System Bootstrap, Version 4.14(6)[fc3], SOFTWARE

Copyright (c) 1986-1994 by cisco Systems

4000 processor with 4096 Kbytes of main memory

Booting new4000-11.0.15sc01 from Flash address space rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

[OK - 2965562/3514238 bytes]

F3: 8496+2957034+165008 at 0x12000

Error : memory requirements exceed available memory

Memory required : 0x0065BA2C

Exception: Software forced crash at 0x1211e (PC)

The above then just repeats its self. So I thought to put the router in to boot mode and erase the flash. However after booting in to boot mode, and "pressing return to get started" all I get is the console is ready message. And this just repeats its self. See below:

cisco 4000 (68030) processor (revision 0xA0) with 4096K/1024K bytes of memory.

Processor ID 5005331

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

4 Ethernet/IEEE 802.3 interfaces.

4 Serial network interfaces.

128K bytes of non-volatile configuration memory.

4096K bytes of Flash address space sized on CPU board.

Press RETURN to get started!

User Access Verification

cal36-02-b-40 con0 is now available

Press RETURN to get started.

User Access Verification

As you can see, this message just repeats its self as well. The "user access verification" message does not even come up in the console, but it does in the capture.

I have tried a number of different terminal emulation types, but none of them seem to change the above.

In ROM monitor the only way I can load an IOS is with an IP address of a TFTP server, unfortunatly I cannot put an IP address on the interface. And this version of ROM monitor does not permit loading an IOS through the console port via a serial connection.

So my question(s): does anyone know how to beak the above boot sequence to access the console? Or should I just return this router to the seller as DOA before wasting any more time with it?

Thanks all for your comments.


PS: yes I have checked to make sure my console software is not putting in a "new line."

New Member

Re: Cisco 4000 boot issues


software crashes occure when there is a serious problem and router reload itself again.

memroy low problem can a software or hardware problem please check the following to troubleshoot memory problems


Re: Cisco 4000 boot issues


It looks like that the IOS version you have on your device needs more memory than is available on the device. What you can do go into the ROM Mon mode and then 'xmodem' another version of IOS whose memory and other requirements is fulfilled by the device you are having.



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