switch problem

[gfexrd]

Hi,

I am having problems with connectivity. I have a LAN that is splitted
in 2 segment, segment 1 has 12 PCs and segment 2 has 14 PCs. Both
segment are
joined through a switch, 16 port each.



|PC1| |PC2| .... |PC12|
------------------------
|
|
------------
|switch 1 |
------------
|
|
|
------------
|switch 2 |
------------
|
|
------------------------ --------
|PC1| |PC2| .... |PC14| |SERVER|



The problem is until yesterday all were working OK, but today the PCs
on segment 1 (switch 1) can not connect to server, neither between
them.
If I turn off switch 1, and turn it on, I have connection
but only for a few seconds and then there is nothing again.
If I put a old hub replacing the switch 1, everything works fine.
I have tested 2 switches with same results, and I have checked the
wired and
seems everything allright.

What is going on? Maybe electrical interferences ?

Thanks in advance.

 

[Richard G. Harper]

Are these computers truly "segmented" - that is, on different network
address ranges - or are they all in the same range with the switches between
them? If they are truly segmented then you have a routing issue between the
switches and need to address that, otherwise it's probably a hardware
failure in one switch or the other.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm

 

[Rod Carty]

Are these computers truly "segmented" - that is, on different network
address ranges - or are they all in the same range with the switches between
them? If they are truly segmented then you have a routing issue between the
switches and need to address that, otherwise it's probably a hardware
failure in one switch or the other.

Switches don't care what IP addresses the computers are, they only look
at the hardware addresses. The exception to this is if you have
something like the layer 3 switch from Cisco. That's a switch/router.

Try swapping out the other switch, seeing as you seem to have at least
one spare. If that doesn't do it do a Cat-5 test on your cable between
them if it's hardwired, replace it if it's a patch cable.

 

[Phillip Windell]

If I put a old hub replacing the switch 1, everything works fine.

I have tested 2 switches with same results, and I have checked the

Then you answered your own question,...Switch #1 is bad.

Switches have nothing to do with segmentation. And since temporarily
replacing it with a Hub made things work, you do not have a Layer3 Switch
either, since Hubs can't do anything "smart". You appear to have a single
segment network.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Troubleshooting Client Authentication on Access Rules in ISA Server 2004
http://download.microsoft.com/download/9/1/8/918ed2d3-71d0-40ed-8e6d-fd6eeb6cfa07/ts_rules.doc

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

Deployment Guidelines for ISA Server 2004 Enterprise Edition
http://www.microsoft.com/technet/prodtechnol/isa/2004/deploy/dgisaserver.mspx
-----------------------------------------------------