Hmmm, never understood it that way. I always thought that it was 7 hops from
the root bridge. As ever my reference is my flaky memory, so I'm off to try
and find out why I thought that.
Gaz
""Priscilla Oppenheimer"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> At 07:27 PM 8/28/01, Gareth Hinton wrote:
> >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.
>
> Hmm, it is late, but I don't think the placement of the root bridge
matters
> in this question. The Cisco text says "This means that two distinct
bridges
> in the network should not be more than seven hops away the one to the
> other." The English is awkward, but the meaning is clear and notice that
> there's no mention of the root bridge.
>
> IEEE 802.1D says that the recommended value for the maximum bridge
diameter
> is 7, and its definition is "The maximum bridge diameter of the Bridge
LAN:
> The maximum number of Bridges between any two points of attachment of end
> stations."
>
> Priscilla
>
>
>
>
> >""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
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=17837&t=17489
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