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Anonymous_User Absent Member.
Absent Member.
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Small Business Network Switch Freezes Intermittently

Background:
I am managing a small Novell NetWare environment that consists of: (2) Netware 6.5 SP6 boxes, (7) Windows XP SP3 workstations, and (2) network printers. These devices are all connected to a basic, unmanaged, 10/100/1000 Mbps switch (Netgear JGS524).

The Issue:
Unexpectedly, all devices on the Network will randomly lose connectivity at the same time (no pings go thru to/from any device), and the lights on the front of the switch "freeze" in their current state (for example, if I pull a network cable out of a switch port, it will remain illuminated in its last state, as if the cable were still plugged in). The only way to restore connectivity at this point is to reset the switch by cycling the power on/off.

Troubleshooting History:
We've been experiencing this problem for quite some time, and at first I assumed the switch was bad, so I replaced it with a different model only to find that the issue still occurs (the switch listed above is the current model we're using).

I'm having trouble diagnosing this problem, as I can't seem to correlate what's happening on the network to initiate the switch lock-up. Sometimes it will happen twice in one day, and sometimes it will go 3 or 4 days with no problems. It would be hard to leave a packet scan running for 3 days and then try to determine at what time the lockup occurred if I’m not continually observing the switch 24/7.

Anyway, any thoughts on a good approach to narrowing down what's causing this? Or any obvious culprits that might exist in a Netware environment that could be causing a broadcast storm?

Thanks!

Joe
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elagrew Absent Member.
Absent Member.

Re: Small Business Network Switch Freezes Intermittently

When you say you've replaced the switch with a different model...what did you mean by that? A different vendor or same vendor just different model of the same?

I'd probably try a different switch altogether...but what are you running on the Netware boxes? Most services on Netware have pretty good log files. I would start with that. Also, you can get yourself a pretty easy to set up (free) network monitoring system and sue that for diagnosis.

--El

Kart46;2131319 wrote:
Background:
I am managing a small Novell NetWare environment that consists of: (2) Netware 6.5 SP6 boxes, (7) Windows XP SP3 workstations, and (2) network printers. These devices are all connected to a basic, unmanaged, 10/100/1000 Mbps switch (Netgear JGS524).

The Issue:
Unexpectedly, all devices on the Network will randomly lose connectivity at the same time (no pings go thru to/from any device), and the lights on the front of the switch "freeze" in their current state (for example, if I pull a network cable out of a switch port, it will remain illuminated in its last state, as if the cable were still plugged in). The only way to restore connectivity at this point is to reset the switch by cycling the power on/off.

Troubleshooting History:
We've been experiencing this problem for quite some time, and at first I assumed the switch was bad, so I replaced it with a different model only to find that the issue still occurs (the switch listed above is the current model we're using).

I'm having trouble diagnosing this problem, as I can't seem to correlate what's happening on the network to initiate the switch lock-up. Sometimes it will happen twice in one day, and sometimes it will go 3 or 4 days with no problems. It would be hard to leave a packet scan running for 3 days and then try to determine at what time the lockup occurred if I’m not continually observing the switch 24/7.

Anyway, any thoughts on a good approach to narrowing down what's causing this? Or any obvious culprits that might exist in a Netware environment that could be causing a broadcast storm?

Thanks!

Joe

El LaGrew elbert.lagrew#katun.com elagrew on twitter
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Knowledge Partner
Knowledge Partner

Re: Small Business Network Switch Freezes Intermittently

On Wed, 24 Aug 2011 15:46:02 +0000, Kart46 wrote:

> _BACKGROUND:_
> I am managing a small Novell NetWare environment that consists of: (2)
> Netware 6.5 SP6 boxes


Not that it will matter for your actual problem, but please upgrade these
servers to SP8.


> _THE_ISSUE:_
> Unexpectedly, all devices on the Network will randomly lose connectivity
> at the same time (no pings go thru to/from any device), and the lights
> on the front of the switch "freeze" in their current state


Throw the switch away and replace it. Given that you only have a few
devices, I'd throw the cables away too and replace them.



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