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Odd issue with dell switch

K

kevnich2

Platinum Member
I've just added two dell Powerconnect 2848 switches. All machines are connected to one switch and seem to be communicating fine. I added a single patch cable to connect the two switches together and as soon as I do, I start dropping packets to all of my servers. Very similar to a broadcast storm. I only added a single uplink cable. Both switches currently have a single default VLAN, STP is enabled by default as is broadcast storm protection. I don't see how any of that would be causing this issue but I'm curious what everyone's thoughts are. The second I connect the uplink cable, I lose communication (pings stop responding entirely). Once I disconnect the uplink, after about 3-5 seconds, communication is back up and pings start responding.

Any thoughts?
 
Duplex mismatch or physical layer problem. As long as you're sure there is no chance of a bridge loop.

A unidirectional link could cause this as well (bridge loop), spanning tree can't really deal with that.
 
Thanks Spidey. I won't be able to test it until tonight so will wait until then. Anyone else have any ideas on what to look for?
 
You say all of the machines are connected to the one switch. What is connected to the second switch, and what (if anything) are they connected to down the chain.

Did you try a different patch cable and different ports between the two routers, just to eliminate the possibility of a bad cable/port?
 
Nothing is/was connected to the 2nd dell switch. We're replacing some older netgear switches with new dell's so the machines were connected to two netgear's and one of the new dell 2848 switches. The second dell switch had nothing connected to it and we simply plugged in a patch cable from port 47 to port 47 on both dell switches to link them together. I did try changing patch cable as well as try a different port - both had same results. The 1st dell switch is linked to one of the netgear switches and the netgears are connected together - no loops at all.
 
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