Loop in network?

[glynncounty]

Our network has crashed a few times within the last two days. Come to find out we have a amber.com switch uplinked via copper to it from cisco equipment.

The amber switch had a cable plugged from one port to another port on the switch.

Would this cause the network to go nutz?

[glen.grant]

It certainly could if spanning tree did not handle it correctly if for some reason you have spanning tree turned off . You would have to look to see if one of those ports is either shutdown or blocked for spanning tree . You could do a show spanning-tree blockedports" and see if it is blocked.