MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.
Course Of The Month
11 days, 7 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
Cisco 837 behaving very oddly! Please help.... urgent.....
Posted on 2006-07-20
Hi all,
I have a Cisco 837 before me and it's doing some very strange things. It's straight out of the box so is running the default config. The problem is this: when it's booting, the relevant interface lights on the front flicker reassuringly and all is well. When it finally starts up, the ATM tx/rx lights start flashing loads, won't stop, and the ethernet link lights go out and won't come back on.
All this with the unit not even connected to the ATM (DSL) circuit! I've tried giving the router a simple config but it doesn't make any difference. Can't ping anything from it, other than itself, and nothing can see it. I'm sure the flashing ATM lights are something to do with it but can't find a solution at the moment. Would appreciate any help that you might be able to give.
Thanks.
George Mason
I have a Cisco 837 before me and it's doing some very strange things. It's straight out of the box so is running the default config. The problem is this: when it's booting, the relevant interface lights on the front flicker reassuringly and all is well. When it finally starts up, the ATM tx/rx lights start flashing loads, won't stop, and the ethernet link lights go out and won't come back on.
All this with the unit not even connected to the ATM (DSL) circuit! I've tried giving the router a simple config but it doesn't make any difference. Can't ping anything from it, other than itself, and nothing can see it. I'm sure the flashing ATM lights are something to do with it but can't find a solution at the moment. Would appreciate any help that you might be able to give.
Thanks.
George Mason
[X]
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
2
4 Comments
Hi
Rapidly flashing ATM lights usually indicate that the carrier have been lost, Is the CD light illuminated? Normally this would indicated a wirring problem yopur end (i.e. the modem cable is not in or searted correctly) or an service providers provission issue. If you cabling is fine then I could contact you SP to perfrom the relavent line checks etc.
As for the ethernet lights not comming on, have you tried running "conf t / interface eth x / no shut" command? When you dump a config on one of these routers the interface's are set to the shut down state by default.
You could also get some interface status from "sh int atm x", "sh int eth x" and also "sh controllers atm x" commands
Hope some of this helps.
Rapidly flashing ATM lights usually indicate that the carrier have been lost, Is the CD light illuminated? Normally this would indicated a wirring problem yopur end (i.e. the modem cable is not in or searted correctly) or an service providers provission issue. If you cabling is fine then I could contact you SP to perfrom the relavent line checks etc.
As for the ethernet lights not comming on, have you tried running "conf t / interface eth x / no shut" command? When you dump a config on one of these routers the interface's are set to the shut down state by default.
You could also get some interface status from "sh int atm x", "sh int eth x" and also "sh controllers atm x" commands
Hope some of this helps.
Sorry I didn't make myself clear, got it sorted in the end. The rapidly flashing lights were indeed that it couldn't find a carrier, because I was using the old router to connect to the Internet to post on Experts Exchange!
The problem was that the device contains a 10/100 switch as well as a router. Although I'd configured an IP address on the Ethernet 0 interface, and it was up, the switch port wasn't, meaning that no packets got to or from Eth0. So what I did, after lots of head scratching, was to this:
conf t
int fastethernet1
no shutdown
exit
So simple! After that it behaved much more sensibly. The flashing ATM lights were a distraction, they behaved normally when I connected the device to the line.
Thanks all for posting. Points go to ttwhtt for correctly advising although I fixed it myself!
The problem was that the device contains a 10/100 switch as well as a router. Although I'd configured an IP address on the Ethernet 0 interface, and it was up, the switch port wasn't, meaning that no packets got to or from Eth0. So what I did, after lots of head scratching, was to this:
conf t
int fastethernet1
no shutdown
exit
So simple! After that it behaved much more sensibly. The flashing ATM lights were a distraction, they behaved normally when I connected the device to the line.
Thanks all for posting. Points go to ttwhtt for correctly advising although I fixed it myself!
Featured Post
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Short answer to this question: there is no effective WiFi manager in iOS devices as seen in Windows WiFi or Macbook OSx WiFi management, but this article will try and provide some amicable solutions to better suite your needs.
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Suggested Courses
Earn Certification
HTML5 Specialist - Certification
Free withPremium
Course of the Month11 days, 7 hours left to enroll
Earn Certification
Cisco CCNA R&S: ICND2 v3
$197.00$177.30
Earn Certification
Cisco CCNP Security: SIMOS
$197.00$177.30
623 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.