I got a problem with communication between two servers in the same Vlan, on the same switch(Cat6509-Sup720) and on the same module (WS-X6748-GE-TX). Servers has only layer 2 interfaces without IP assigned to it and those interfaces are very quiet, not sending any traffic. Problem starts when one server want to open communication using mac address of the other server. Switch doesn't know where is destination MAC, so it should flood this packet on all ports in this Vlan. But from tcpdump on both servers I see that it is not doing that!
Server A send packet to B (communication fails)
Server B send packet to A (also fails)
Server B send packet to A (this goes fine).
I have been searching for problem for week now, and could now find anything.
Could You tell me how to trace if flooding is not happening?
Thank You for any suggestions.