Here's something funky I've just started researching. Thought many of you
might not be aware of this...
Awkward STP Parameter Tuning and Diameter Issues
We already saw that an aggressive value for the max-age parameter and the
forward-delay could lead to a very unstable STP. The loss of some BPDUs can
then cause a loop to appear. Another issue, not very known, is related to
the diameter of the bridged network. The conservative default values for the
STP impose a maximum network diameter of seven. This means that two distinct
bridges in the network should not be more than seven hops away the one to
the other. Part of this restriction is coming from the age field BPDU carry:
when a BPDU is propagated from the root bridge towards the leaves of the
tree, the age field is incremented each time it goes though a bridge.
Eventually, when the age field of a BPDU goes beyond max age, it is
discarded. Typically, this will occur if the root is too far away from some
bridges of the network. This issue will impact convergence of the spanning
tree.
This came from: http://www.cisco.com/warp/public/473/16.html#2f
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=17489&t=17489
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