Strange...3Com SuperStack 3870 acting like a hub
Posted on 2007-08-06
I've got several 3Com 3870 Gigabit switches and some weird activity on the network. All are 48 port switches as opposed to the 24 port models.
We have two of these switches connected with a matrix cable, thus binding them into one switch. The second of the two has a fiber module in it and it connects to another 3870 switch of course with a fiber module in it. There is another 3870 connected to this one via a Cat 5e cable to upstairs.
Most of our servers are connected to the main switches that are bound by the matrix cable. Many of our users also connect to this switch.
The weird thing is I can see traffic on the last switch, two daisy chains away which should never leave the first switch. This traffic is NOT broadcast traffic either which is the confusing part. Two machines/servers connected to the same switch with IP traffic with a direct source and a direct destination should NOT be transmitted across the fiber and definitely not up to the third switch over the cat 5e cable to upstairs.
I have all but one wireless router turned off and Spanning Tree and Broadcast Storm control is enabled.
I'm losing my mind. Please help..