[Bridge] Strange STP hello timing problem

Joakim Tjernlund joakim.tjernlund at transmode.se
Wed Feb 22 15:16:21 UTC 2012

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)?


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