cisco 881 router - Memory Utilization Maxed Out

Posted on 2012-03-29
Last Modified: 2012-04-19
Hi All,
I have an issue with a cisco 881 router, the memory utilization maxes out about every 24 hours,  and the router requires a reset.
This started happening after a new VOIP phone system was installed.
Once the memory maxes out the VPN connection drops, unable to telnet, and router has to be restarted.
I have managed to get onto the router just before it locks up. (Screen shots attached),
If anyone has any guidance I would be greatly appreciated. ( or is this just a case of memory needs to be upgraded in the router? )

Thank You

Cisco, 881, Router, memory utilization
Question by:stephenHenderson123
  • 3
  • 2
LVL 10

Expert Comment

ID: 37782442
Post a show version and show stacks. This is not a normal case and there is a high likelihood that a newer IOS version already solves your problems. If that's not available opening a TAC case would be the next option.

Author Comment

ID: 37786284
Thank You results of sh ver, show stacks below
this was when mem usage was up to about 40% another 6 or so hrs and it would be nearly maxed out.

SH Ver
Cisco IOS Software, C880 Software (C880DATA-UNIVERSALK9-M), Version 15.0(1)M4, RELEASE SOFTWARE (fc1)
Technical Support:
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Fri 29-Oct-10 00:02 by prod_rel_team

ROM: System Bootstrap, Version 12.4(22r)YB5, RELEASE SOFTWARE (fc1)

NewYorkRouter uptime is 19 hours, 40 minutes
System returned to ROM by power-on
System restarted at 08:09:41 BST Thu Mar 29 2012
System image file is "flash:c880data-universalk9-mz.150-1.M4.bin"
Last reload type: Normal Reload

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 881 (MPC8300) processor (revision 1.0) with 236544K/25600K bytes of memory.
Processor board ID FCZ1510C0GA

5 FastEthernet interfaces
1 Virtual Private Network (VPN) Module
256K bytes of non-volatile configuration memory.
125440K bytes of ATA CompactFlash (Read/Write)

License Info:

License UDI:

Device#   PID                   SN
*0        CISCO881-K9           **********

License Information for 'c880-data'
    License Level: advsecurity   Type: Permanent
    Next reboot license Level: advsecurity

Configuration register is 0x2102

SH Stacks
Minimum process stacks:
 Free/Size   Name
 8504/9000   EEM ED RF
11032/12000  MRIB IPv4 Init Process
 5532/6000   Inspect Init Msg
 5528/6000   SPAN Subsystem
 2884/12000  Init
58888/60000  EEM Auto Registration Proc
 5196/6000   DIB error message
 5536/6000   SASL MAIN
 2496/3000   Rom Random Update Process
 5480/6000   URPF stats
 8232/12000  Exec

Interrupt level stacks:
Level    Called Unused/Size  Name
  1           0   9000/9000  i2c console redirect host Interrupt
  4    41566759   5236/9000  Host/PCI Bridge Interrupt
  5    76592513   8824/9000  PQII PRO Timer
  6         644   8908/9000  16552 Con/Aux Interrupt

Interrupt level stacks:
Level    Called Unused/Size  Name
  7    19164518   8884/9000  M8300_TIMER_INTERRUPT
LVL 10

Accepted Solution

mat1458 earned 500 total points
ID: 37786351
Stupid question to ask for show stacks, since you had to power the router. It does not help finding out the reason of the crash.

There are some bugs related to memory issues in 15.0(1) versions. It might be useful to upgrade to 15.0(1)M8 or even 15.1(4)M4 to see if the error reoccurs. Before opening a case Cisco TAC asks you generally to upgrade to the latest release and that's what you'd be doing with the releases above.
Simple, centralized multimedia control

Watch and learn to see how ATEN provided an easy and effective way for three jointly-owned pubs to control the 60 televisions located across their three venues utilizing the ATEN Control System, Modular Matrix Switch and HDBaseT extenders.


Author Comment

ID: 37786563
Cheers, I will upgrade the IOS, in the morning before the users come on-line.
will let you know how I get on
Thank You
LVL 10

Expert Comment

ID: 37786570
Hope it helps. Good luck!
LVL 10

Expert Comment

ID: 37805024
New IOS will help!

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The Cisco RV042 router is a popular small network interfacing device that is often used as an internet gateway. Network administrators need to get at the management interface to make settings, change passwords, etc. This access is generally done usi…
Shadow IT is coming out of the shadows as more businesses are choosing cloud-based applications. It is now a multi-cloud world for most organizations. Simultaneously, most businesses have yet to consolidate with one cloud provider or define an offic…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question