From: phase90 (phase90@comcast.net)
Date: Thu Mar 18 2004 - 22:13:41 GMT-3
Sam,
Is it single-mode fiber runs? If it is, it could be the
attenuation on the fiber is not
enough and the TX on port 1 on your Sw 1 is burning out the RX on your Sw 2.
This happened to my network 1 time when someone ran a single-mode fiber for
on a 1 meter jumper in between a router
and a Lightstream 1010. This is way out of spec and yet it ran fine for over
2 years until the PAM on
the LS1010 couldn't take it anymore and just burnt out. Worth a look.
Jerry
----- Original Message -----
From: "Sam Joseph" <samjoseph747@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, March 18, 2004 7:26 PM
Subject: 3COM Question
> Hi Group,
>
> Wanted to throw in this and let me know, what you Cisco Experts think
about
> this.
>
> At my work, We have 3COM 9300 ( 12 port Fiber) switch. This Sw has Layer 3
> capabilities. Upart from Default Vlan we created one more VLAN. Thats all.
> No inter VLAN communication. We exhausted all 12 ports on Present Sw.
>
> We went ahead and bought another 3COM 9300 Sw. When Hooked the second
> switch, it was hooked as a cascading chain. Port 1 from Sw1 Connected to
> Port 1 of Sw2 with Fiber Cross Over cable.
>
> It worked for some time. May be 6 --- 8 Months. Then the Port1 on Sw2
> Failed. We thought Port1 went bad on Sw2. We moved it to Port2. After a
> Month Port2 on Sw2 Failed. We moved it to Port3 now. It has been working
> Okay since then.
>
> This Morning, Port4 on Sw2 failed. We moved it to Port5 on Sw2.
>
> Is this a symptom of switch2 going bad one port at a time?. or there is a
> missing Link.
>
> Your Earliest Response will be Appreciated.
>
> ---Sam.
>
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