LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Networking
User Name
Password
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.

Notices



Reply
 
Search this Thread
Old 08-13-2007, 10:27 AM   #1
tlemons
Member
 
Registered: Jun 2004
Posts: 39

Rep: Reputation: 15
How to detect Ethernet switch loops


Hi

Our lab recently suffered frequent network timeouts/unavailabilities that we traced to two switches that had three connections between them. We currently believe that these less-expensive switches do not support a spanning tree protocol. What tools exist to detect and isolate a problem like this (switch loops)?

Thanks
tl
 
Old 08-13-2007, 07:56 PM   #2
rossonieri#1
Member
 
Registered: Jun 2007
Posts: 359

Rep: Reputation: 34
hi tlemons,

are those really old switches?
try to see the LED - and read the manual.
every loop will terminate one of the connection.

if you want to "legitimate" loop then you should disable STP and doing etherchannel/port aggregation protocol or IST interswitch trunk. but you must make sure you have a loop free network.

HTH.

Last edited by rossonieri#1; 08-13-2007 at 07:58 PM.
 
Old 08-15-2007, 02:14 PM   #3
tlemons
Member
 
Registered: Jun 2004
Posts: 39

Original Poster
Rep: Reputation: 15
Hi

Thanks for the reply. No, these are not old switches, but are cheap Netgear switches that do not include any form of spanning tree protocol. So, when someone connected two switches together using three different cables, network performance was horrible while the network tried to recover from this problem. I want to find a way to detect this is happening.

Thoughts?

Thanks
tl
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Onboard ethernet wont detect vicky_me Red Hat 5 03-04-2007 03:13 PM
How to detect whether a hub or switch is used ? antonypaul Linux - Networking 1 12-02-2005 09:47 AM
Switch ethernet- to wireles - to ethernet? pterandon Linux - Networking 0 05-06-2005 05:28 PM
C Loops and switch statements ripwheels8 Programming 4 11-13-2004 05:47 PM
I can't detect my ethernet card SenorPedo Linux - Hardware 169 05-23-2004 07:15 AM


All times are GMT -5. The time now is 03:57 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration