Always thought that Diameter was a misleading term.
If the root bridge is physically in the centre of the bridged network, the
diameter is actually the radius.
Hmmm - more coffee - it's late.
""Leigh Anne Chisholm"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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=17596&t=17489
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