Auto MDI/MDI-X + conference rooms + bored == loop
Chuck Anderson
cra at WPI.EDU
Fri Mar 26 23:36:08 UTC 2010
On Fri, Mar 26, 2010 at 03:33:56PM -0700, Owen DeLong wrote:
> Switches that support STP?
Yes, "soho" or "desktop" switches I mean. Apparently Netgear GS105's
do not do STP at all, at least they don't claim to.
> There are switches that have STP protection such that they are
> portfast until they see an inbound BPDU and then revert to
> spanning tree on that port (it blocks, listens, learns, then
> forwards if appropriate).
Do the ports so configured also send BPDUs such that a loop on a
"desktop" switch uplinked to that port will cause the port to see its
own BPDUs and revert to STP Blocking? Even if that is the case, I
think the detection of BPDU and subsequent transition to Blocking will
happen too slowly. By then the damage is already done upstream in the
collapsed L2/L3 core.
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