From: Joseph Brunner (joe@affirmedsystems.com)
Date: Tue Nov 06 2007 - 11:35:08 ART
Actually I have seen diameters greater than 7 just recently (perhaps as much
as 11).
I believe the original standard was written at a time when they didn't have
what we know as a switch (hubs, translational bridges, etc.)
Its far better to layer 3 route as we all know, so why not just keep your
diameter around 2 (access to distribution) then route after that?
Layer 3 switches today can be had for dirt prices (ok, maybe dell/hp)...
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
sheherezada@gmail.com
Sent: Tuesday, November 06, 2007 4:43 AM
To: Cisco certification
Subject: OT: STP diameter
Hi,
I suppose that daisy-chaining switches beyond 3 or 4 bridges is not
recommended, because I have never saw this in a reference design. I
also know the IEEE 802.1D recommendation of having no more than 7
bridges diameter with the default STP timers. However, can anyone
tell me WHY having a 7-8 bridge loop topology is such a bad idea in
practice after all, especially with RSTP, apart from possibly
degrading convergence time? I am not saying that this would be good,
I just want to clear the FUD. My understanding is that the
theoretical diameter is given by the Max Age value, hence we may have
a maximum diameter of 20.
Thanks,
Mihai
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