We have 8 switches in cascade (Half Duplex Gigastack) . Lets say Switches 1-8. A fibre from our main building land at Switch 1. There is an uplink to another building from Switch 3.
[3500XL ] gig to another building
[3500XL ] <- fibre from manin building
1)We have couple of hubs connect to various ports on these switches
2)I get this error message %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 2 is flapping between port Gi0/1 and port Gi0/2
3) I also have lots of collision on Switch 1's exit port to Switch 2 ( Do I need to post sh in gig 0/1 ?)
4) What will be causing these collisions? How can I find the culprit(s)?
5)We will be replacing the hub with 8 port switches soon
6)We have vlans running for data/voice/management
7)Yes, its trunked and sort.
Is there a better way to reconfigure this design....like Star ? But then there will have to be a purchase.