08-09-2013 02:06 PM - edited 03-07-2019 02:51 PM
Hi,
I have a Cisco 2520 router with flash:igs-j-l.111-5. Why can' a 10.0.0.1 address be fiven a /24?
SanJose1(config-if)#ip address 10.0.0.1 255.255.255.0
Bad mask /24 for address 10.0.0.1
Thanks.
Solved! Go to Solution.
08-09-2013 02:11 PM
Hello,
You are running an extremely outdated IOS version. It probably defaults to classful routing behavior and avoids subnet addresses that overlap the address of the unsubnetted classful network (i.e. 10.0.0.0/24 and 10.0.0.0/8) - so-called subnet-zero addresses.
Try entering these two global configuration commands:
ip classless
ip subnet-zero
Then try configuring the 10.0.0.1/24 address on your interface again.
Best regards,
Peter
08-09-2013 02:11 PM
Hello,
You are running an extremely outdated IOS version. It probably defaults to classful routing behavior and avoids subnet addresses that overlap the address of the unsubnetted classful network (i.e. 10.0.0.0/24 and 10.0.0.0/8) - so-called subnet-zero addresses.
Try entering these two global configuration commands:
ip classless
ip subnet-zero
Then try configuring the 10.0.0.1/24 address on your interface again.
Best regards,
Peter
08-09-2013 02:19 PM
Thanks-The commands work.
Regards.
Said
08-09-2013 02:23 PM
Could you assist with a 2610 router? I tried to update the image witout erasing the old image. The router now goes in a loop while loading.
rommon1 > dir
usage:dir
How can the router be made operational?
Thanks.
Said
08-09-2013 02:28 PM
Could you assist with a 2610 router? I tried to update the image witout erasing the old image. The router now goes in a loop while loading.
rommon1 > dir
usage:dir
How can the router be made operational?
Thanks.
Said
08-09-2013 02:45 PM
Hi Said,
Can you post the transcript of the 2610 booting? There may be some information that will help us understand what went wrong.
Best regards,
Peter
08-09-2013 03:00 PM
"..Configured I/O memory percentage was too large. Using 10 percent...."
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IK2S-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 07:48 by phanguye
Image text-base: 0x80008088, data-base: 0x80D78DB8
SYSTEM INIT: INSUFFICIENT MEMORY TO BOOT THE IMAGE!
System Bootstrap, Version 11.3(2)XA3, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1998 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 24576 Kbytes of main memory
System Bootstrap, Version 11.3(2)XA3, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1998 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
PC = 0xfff0a53c, Vector = 0x500, SP = 0x680127c8
PC = 0xfff0a53c, Vector = 0x500, SP = 0x680127b0
The following are the only options in rommon mode.
rommon 8 > dir ?
bad device name
rommon 6 > ?
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex
dev list the device table
dir list files in file system
dis display instruction stream
dnld serial download a program module
frame print out a selected stack frame
help monitor builtin command help
history monitor command history
meminfo main memory information
repeat repeat a monitor command
reset system reset
set display the monitor variables
stack produce a stack trace
sync write monitor environment to NVRAM
sysret print out info from last system return
tftpdnld tftp image download
unalias unset an alias
unset unset a monitor variable
xmodem x/ymodem image download
Thanks.
Said
08-09-2013 02:47 PM
Hi Said,
You can actually look at the available devices name with the "device" command. Then do a dir
Regards
08-09-2013 03:50 PM
Harold,
How do you find the device name?
Said
08-09-2013 04:05 PM
Said,
You do not have enough DRAM to run that image. You have 24MB RAM while the image you are trying to boot needs at least 40MB RAM. If I understand you correctly, you currently have two IOS images in your FLASH.
If that is so, try using the dir flash: command to list the files in your FLASH. Then boot the other image using the boot flash:imagename command. Then, after the other IOS boots, delete the offending IOS from the FLASH. Do not use any
Best regards,
Peter
08-09-2013 04:12 PM
Peter,
rommon 2 > dir flash:
File size Checksum File name
7891164 bytes (0x7868dc) 0xdfb0 c2600-ik2s-mz.120-7.t.bin
I have tried to download a smaller image from a tftp server numerous times. The image download from tftp server completes with the below message. The antivirus is turned off on the Win 7 box, I have changed the cross over cable from the PC to the router, I have tried different images to no avail. The images tried were: c2600-io3-mz.122-23.bin, 5664KB and c2600-ik2s-mz.120-7.t.bin, 7,707KB. Any suggestion?
"File reception completed.
TFTP copy: operation terminated due to bad checksum comparison.
rommon 23 > IP_ADDRESS=192.168.3.3
rommon 24 > IP_SUBNET_MASK=255.255.255.0
rommon 25 > DEFAULT_GATEWAY=192.168.3.1
rommon 26 > TFTP_SERVER=192.168.3.2
rommon 27 > TFTP_FILE=[smaller image] ?
rommon 28 > tftpdnld
The above resulted in a 'corrupt file
Kindly advise.
08-09-2013 03:54 PM
rommon 1 > dir
Input redirection is not supported at this level
Output redirection is not supported at this level
08-09-2013 03:56 PM
Harold,
rommon 2 > dev
Devices in device table:
id name
flash: flash
Kindly advise.
Thanks.
Said
08-09-2013 04:07 PM
Hi Said,
The next step would be to use dir flash: to look at the image names. It looks like you do not have enough memory to run the new image, so you will need to boot the old one instead.
Regards
08-11-2013 11:58 AM
Hi Said,
I wonder - what TFTP server are you using? Perhaps you could try to use a different TFTP server on your Windows machine. I have have good experiences using Tftpd32 or Tftpd64 (depends on your Windows version) downloadable here:
http://tftpd32.jounin.net/tftpd32_download.html
It would also be worth to verify whether the IOS image you are downloading from your TFTP server is not corrupted. However, neither of the images you have can fit into your DRAM. Images that appear to fit into 24MB of RAM are:
c2600-js-mz.120-28c.bin (ENTERPRISE PLUS)
c2600-i-mz.120-28c.bin (IP)
c2600-is-mz.120-28c.bin (IP PLUS)
c2600-d-mz.120-28c.bin (IP/IPX/AT/DEC)
c2600-ds-mz.120-28c.bin (IP/IPX/AT/DEC PLUS)
I would personally recommend going for any of the PLUS feature sets if possible.
Best regards,
Peter
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