[PLUG-TALK] this one weird trick...

[Tomas Kuchta]

I guess, that I should have been explicit about - not suggesting that OP
should buy better/managed switch - I simply intended to point to
existence/terminology of spanning tree guard feature in managed switches.

There is also standard for doing that as mentioned here:
https://help.ui.com/hc/en-us/articles/360006836773-UniFi-USW-Configuring-Spanning-Tree-Protocol

This is interesting feature - needed to manage redundant paths in the
switched network for failover resiliency.

Hope that my comment makes better sense/context.

Tomas



On Mon, May 1, 2023, 12:42 Ted Mittelstaedt <tedm at portlandia-it.com> wrote:

> I saw that also, but high quality switches that are smart enough to
> partition off segments that cause loops are likely well beyond his and the
> older PLUG clinic expense account, LOL.
>
> Ted
>
> -----Original Message-----
> From: PLUG-talk <plug-talk-bounces at pdxlinux.org> On Behalf Of Tomas Kuchta
> Sent: Monday, May 1, 2023 9:39 AM
> To: Off-topic and potentially flammable discussion <plug-talk at pdxlinux.org
> >
> Subject: Re: [PLUG-TALK] this one weird trick...
>
>
> https://blogs.cisco.com/networking/preventing-network-loops-a-feature-you-need-to-be-aware-of
>
> On Sat, Apr 29, 2023, 18:14 Galen Seitz <galens at seitzassoc.com> wrote:
>
> > will prevent your switch from passing traffic.
> >
> > After replacing my old network switch with my new Zyxel GS1900-24E
> > running OpenWRT, no traffic would pass through the switch.  After
> > trying all sorts of pinging, and wondering whether I now had two DHCP
> > servers on the same net, I finally realized the LEDs on the switch
> > were flashing more rapidly than normal.  OK, time to start unplugging
> > clients one by one.  Ah, when I unplug the blue cable, the flashing
> > stops.  Where's that cable go?  It seems to loop around and, oh, it
> > comes back to the switch.  Doh!  I successfully rediscovered something
> > that Eric H. had described long ago.  Students in Paul Nelson's school
> > had discovered that looping a cable on a network switch was a good way
> > to get out of doing work.
> >
> > galen
> > --
> > Galen Seitz
> > galens at seitzassoc.com
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