Hi all, I am basically facing a problem with STP. But since STP is related to VLAN in some respect I guess there would be someone here who can help me. Background: We have developed a layer two switch. This uses Cirrus logic's ep9301 processor, embedded Linux 2.4.21 kernel as the OS and zarlink's switch controller. The observation: 1)we have 2 switches, switch A and switch B 2)port 1 and port 2 of switch A are connected to port 1 and port 2 of switch B 3)1 PC is connected to port 0 of switch A and another to COM port of switch A to observe STP 4)We restart the 2 switches and observe that one of the links is blocked and the other in forwarding state. STP is always enabled on reboot 6)We start to ping switch A and the switches and the two PC hang. 7)the LEDs on the switch device that signify the activity are seen continuously glowing. 8)switch A and B, PC 1 and 2 cannot be accessed at all. 9) We remove one of the links and the STP reconfigures and the switch A can be pinged. 10)Most of the time we have observed, although not a confirmed pattern, that if we remove the blocked link, the STP just disables the port on switch A (we have not observed the counter part on the switch B 11)Neither the switches nor the PCs were on the rest of the company network Its not a hang exactly as upon some topology change the system is back to working. I also checked on the internet. On cisco site I found something called unicast flooding. Is this the reason for the system to blog down? what would be the fix or some pointer in this regard? Please help. Sameer
