[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now


Cisco 851 - Power Outage - How to bring back online?

Posted on 2008-06-24
Medium Priority
Last Modified: 2010-05-18
I have a Cisco 851 in one of our branch offices.
They have a 2.5 hour power outag last night (Thunder stroms...) and the 851 did not come back online.
After a 2 hour drive to the branch, I discover the router just needed a reload command.

Before I issued the reload command... this is what I saw on the router - see code snippit.

How can I setup the router so it comes back online once power has restored?
(Or was this a oddball flike??)



851 con0 is now available                                 
Press RETURN to get started.                            
rommon 1 >          
rommon 1 > ?            
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                                                          
copy                Copy a file-copy [-b <buffer_size>] <src_file> <dst_file>                                                                             
delete              Delete file(s)-delete <filenames ...>                       
dir                 List files in directories-dir <directory>
dis                 display instruction stream
dnld                serial download a program module
format              Format a filesystem-format <filesystem>
frame               print out a selected stack frame
fsck                Check filesystem consistency-fsck <filesystem>
help                monitor builtin command help
history             monitor command history
meminfo             main memory information
mkdir               Create dir(s)-mkdir <dirnames ...>
more                Concatenate (type) file(s)-cat <filenames ...>
rename              Rename a file-rename <old_name> <new_name>
repeat              repeat a monitor command
reset               system reset
rmdir               Remove a directory
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
rommon 2 >

Open in new window

Question by:edalzell
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2

Author Comment

ID: 21855172
Here's my config:

Using 2487 out of 131072 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname cisco581
logging buffered 52000
no aaa new-model
clock timezone PCTime -5
clock summer-time PCTime date Apr 6 2003 2:00 Oct 26 2003 2:00
crypto pki trustpoint TP-self-signed-1595647584
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-1595647584
 revocation-check none
 rsakeypair TP-self-signed-1595647584
crypto pki certificate chain TP-self-signed-1595647584
 certificate self-signed 01 nvram:IOS-Self-Sig#5.cer
dot11 syslog
no ip dhcp use vrf connected
ip dhcp excluded-address
ip dhcp excluded-address
ip dhcp pool sdm-pool
   import all
   domain-name domain.com
   lease 365
ip cef
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
no ip domain lookup
ip domain name domain.com
username edalzell privilege 15 secret 5 $1$0Hom$xcUg7nbkMTI3eXVr/1Mow.
username kcutech privilege 15 secret 5 $1$Fhi9$F3cbQ9EXUdaflf3EuICR1.
 log config
interface FastEthernet0
interface FastEthernet1
interface FastEthernet2
interface FastEthernet3
interface FastEthernet4
 description $ETH-LAN$
 ip address
 ip access-group 100 in
 duplex auto
 speed auto
interface Vlan1
 ip address
 ip tcp adjust-mss 1452
ip forward-protocol nd
ip route permanent
ip route permanent
ip route permanent
ip http server
ip http access-class 1
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
ip access-list extended ACL1
 remark Allow Ping
 remark SDM_ACL Category=1
 remark PING
 permit icmp any any
ip access-list extended ACL2
 remark Any!
 remark SDM_ACL Category=128
 permit ip any any
no cdp run
banner exec ^Cine
banner login ^CWelcome to KCU!
line con 0
login local
 no modem enable
line aux 0
line vty 0 4
 access-class 101 in
 privilege level 15
 login local
 transport input telnet ssh
scheduler max-task-time 5000

Open in new window

LVL 43

Expert Comment

ID: 21855178
It was a fluke.  Some times the router boots into ROMMON and requires to be turned off and back on again or issued the "boot" command.  I have seen this when there is something plugged into the console port like a  modem.

Author Comment

ID: 21859573
I see.
I turned the power off (using the power switch..) and while still plugged into the console, it still came up with the ROMMON prompt.
Is there anything I ccan do in the future to prevent a 2.5 hour drive? ;-)

Thanks for your help!
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Accepted Solution

fileinster earned 2000 total points
ID: 21861534
Yes, try this:
sh ver  (look for Configuration Register near the end)
If it's not 2102 do this:

conf t
config-register 0x2102

Power off the router and see if that helps.


Author Comment

ID: 21861916
Ok... it says: Configuration register is 0x0
What does this do? (I'll try this next time I'm there.....)


Cisco IOS Software, C850 Software (C850-ADVSECURITYK9-M), Version 12.4(15)T5, RE
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 01-May-08 02:07 by prod_rel_team
ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE
cisco851 uptime is 12 hours, 35 minutes
System returned to ROM by power-on
System image file is "flash:c850-advsecurityk9-mz.124-15.T5.bin"
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 851 (MPC8272) processor (revision 0x300) with 59392K/6144K bytes of memory
Processor board ID FHK1223201V
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
5 FastEthernet interfaces
128K bytes of non-volatile configuration memory.
20480K bytes of processor board System flash (Intel Strataflash)
Configuration register is 0x0

Open in new window


Expert Comment

ID: 21867352
AH! that's your problem then. Do what I said and that'll be fixed.

The configuration register specifies where the router gets it's IOS image from. 0x0 means don't boot, while 0x2102 means boot from flash.

Author Comment

ID: 21875315
Great, thanks fileinster!

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

It happens many times that access list (ACL) have to be applied to outgoing router interface in order to limit some traffic.This article is about how to test ACL from the router which is not very intuitive for everyone. Below scenario shows simple s…
We've been using the Cisco/Linksys RV042 for years as: - an internet Gateway - a site-to-site VPN device - a leased line site-to-site subnet-to-subnet interface (And, here I'm assuming that any RV0xx behaves the same way as an RV042.  So that's …
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), 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 (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), 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…
Suggested Courses

650 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