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Rob RudloffFlag for United States of America

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Two connections to the same switch?

Hi.  
Please look at the attached jpg.  This is a simplified diagram of my client's network layout between 2 buildings, where there are Windows servers in one building, and PC's in the next building.  Without going in to the gory details, they want to have a second "backup" Cat6 line, in case the current line dies.

Simply put, can there be two connections between the same network switches?  In this case, these are "unmanaged" switches (or "dumb switches" as we call them).

I say "no", but I'm a programmer not a network guy ...
Will this cause some sort of problem?  I think they can do this with a "managed" switch, but not an "unmanaged" switch.

Thanks
Cat5.jpg
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fmarshall:  That is exactly the case here, but they wanted failover to be automatic (They are trying to avoid relying on the workers in Building #2 to remember what a Cat6 cable is, what to unplug, what to plug in , etc.)

ultralites:  Thanks for putting that into the real terminology for us -- what we were picturing was a storm of data packets echo-ing and reverberating, or "feedback" like a microphone at a loud concert.
Well then, keep it plugged in in Bldg 2.  Unplug it at the other end.
Excellent advice fmarshall!
Thanks.  The other option might be to plug it in and disable the switch port that it plugs into.  The reconnection is a bit more "techie" and you may not want that.
But, if you can find a way to run a script that anyone can run then it might work.
One script to switch to backup (open one port, block another)
One script to do the opposite.
Also would allow the backup test to be run remotely.

Sorry that I don't know how to do that.  It's going to be switch-dependent, etc.