Hi,
A single point of failure is where a network comes back to a single device
and/or cable that if it fails the network will fail.
I am often amused to see people cross connecting switches in a rack setting
them up to have two network cards in servers etc only to plug all the
devices into one power supply with on UPS.
It gets even better when you have two power supplies in a device plugged
into the same power source. The power source is the most likely point of
failure and is a single point of failure.
Another good one is when having two connections to the WAN via different
suppliers. Theory looks good. Often however the cable coming into the site
has the same entry point (if not the same cable). A single point of failure.
I once came across a fully redundant network all coming back to on card in a
chassis. The card had no support and would have taken 4 weeks to get a
replacement. Not a good design is it?
Just some thoughts
Teunis,
Hobart, Tasmania
Australia
On Wednesday, September 05, 2001 at 11:43:19 PM, david wrote:
> it usually means a routing or switching device is down,or the link is cut?
>
>
> Thanks,
>
> David
--
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