[TriLUG] anyone need and Edgerouter 12P?

[Robert Wagoner via TriLUG]

Wes, you shouldn't need to make crossover cables for this, and you
might want to avoid doing that.  !000BASE-T uses bidirectional
signaling across all 4 pairs, so a straight patch cable is the right
thing to use.  Even for lower 10BASE-T or 100BASE-TX which have a
designated transmit pair and receive pair, nearly all contemporary
hardware will automatically handle the MDI/MDI-X crossover, so you can
use straight cables consistently and avoid a lot of potential
misconfiguration problems.  It's possible that a handmade cable might
have been the culprit which caused the PoE to get stuck in the first
place.  (Not judging)
-- 
Robert

On Mon, Jul 18, 2022 at 10:35 PM Wes Garrison via TriLUG
<trilug at trilug.org> wrote:
>
> Hey Greg,
>
> Thanks so much for the info.  Could you elaborate more on the "undocumented
> resets" and CLI tricks?
>
> I haven't heard of any of these things.  I'll Google the spanning tree
> reset and give that a go, though.  I'm good at making crossover cables.
>
> Power on these are on pins 4-5 and 7-8, so nothing should start smoking
> with a cable that crosses 1-2 and 3-6.
>
> -Wes
>
>
> On Mon, Jul 18, 2022 at 6:29 PM Greg Brown <gwbrown1 at gmail.com> wrote:
>
> > Hum.... I imagine you have done all the CLI tricks including the
> > undocumented resets and all that?  The PoE ports used to be controlled
> > four to a single controller chip but I"m not sure if this is still the
> > case or not.  Since the device is likely to be heading back and is
> > kind of, sort-of dead in a way you might want to try the "spanning
> > tree" reset where you take a couple of crossover Ethernet cables and
> > after the device boots plug, say, port 1 into port 5 and port 8 into
> > port 10 and so on.. just make sure that the loops you form go from
> > chip-to-chip (and hence across the backplane).  If that doesn't work
> > leave everything plugged up just the way it is and pull power from the
> > back and then power it back up with the cables in place.
> >
> > That's a long shot but I've seen something similar work in the past.
> > That or you're going to watch it give up the smoky ghost.
> >
> > If you try it please let me know if it works. I am curious.
> >
> > Greg
> >
> > On Mon, Jul 18, 2022 at 6:21 PM Wes Garrison via TriLUG
> > <trilug at trilug.org> wrote:
> > >
> > > I have a Ubiquiti EdgeRouter 12P that I can't use.
> > >
> > > The ER-12P has 2 1Gbps SFP ports and 10 1Gbps RJ-45 ports, 8 of which can
> > > be made part of a switch via a hardware switch chip.
> > >
> > > It can also send Ubiquiti's proprietary 24V PoE on all 10 ports.
> > >
> > > It's a great router:
> > >
> > https://store.ui.com/collections/operator-edgemax-routers/products/edgerouter-12p
> > >
> > > ...but there's a catch.
> > >
> > > The PoE on all 10 ports is stuck ON.  The router is working great, but I
> > > can't get the power to turn off.
> > >
> > > If this is useful to one of you, please let me know, otherwise I'm going
> > to
> > > send it back.
> > >
> > > Thanks,
> > >
> > > -Wes
> > > --
> > > This message was sent to: Greg Brown <gwbrown1 at gmail.com>
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> > that address.
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> >
> --
> This message was sent to: Robert Wagoner <rawagoner at gmail.com>
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