i86bi-linux-l2-adventerprisek9-15.1a.bin on Cisco IOU via GNS3
All I did was power on the devices, connect them and do a 'no shut'-command on their connected interfaces.
I thought spanning tree was enabled by default but when I do a show spanning-tree on any of the switches it says "No spanning tree instances exist".
The FastEthernet1/0 ports of ESW2 and ESW3 both show a status of UP/Down.
Do I have to enable the port as trunks before spanning-tree gets enabled? Why is the fa1/0 of those two switches UP/Down? It looks almost like it might be blocking?