Have 3 bridges in serie: A - B - C A is designated root. In B I can see with tcpdump that I receive STP Hellos ever 2 secs from A, this is normal. However B forwards hellos to C every 20 secs( max age timer). This makes topo calculation go into spin every now and then. Should not B forward hellos as they come from A(every 2 secs)? Jocke