Re: Hardware question

[Stipo via NANOG <nanog () lists nanog org>]

Hi Craig,

As another user mentioned, you are probably looking for "Fail to wire" or /
"bypass pair".

I've used Cloudgenix/Palo Alto Prisma SD-WAN with much success.

On Mon, Jun 23, 2025 at 9:51 AM Riley O via NANOG <nanog () lists nanog org>
wrote:

> The optical world does have a well fit solution, in the form of optical
> line taps... I've never used the independent modules, but it's common to
> see them integrated into a MUX as a monitor port.
>
> Quick search found this:
>
> https://www.showmecables.com/by-category/patch-panels/fiber-optic-systems/passive-optical-taps
>
> I'd contend this is better, as they start and end passive, avoiding a
> state change in a failure scenario. Although, un-networked devices in the
> middle of a circuit can become problematic if undocumented. The last thing
> you want is to be hunting down failed splices, when the answer is a loose
> connection in a datacenter.
>
> Probably good if you can have some type of networked monitoring platform
> in line with one of these.
>
> > From the sounds of it though, OP would need his device to be addressable
> via one of the connections it is monitoring... and passive taps are
> unidirectional. As far as optical networking goes, a passive solution would
> require some type of multiplexing, which implies special equipment at
> midpsan, A, and Z ends of the circuit.
>
>
> - Riley
>
>
> On Monday, June 23rd, 2025 at 9:41 AM, Kevin Shymkiw via NANOG <
> nanog () lists nanog org> wrote:
>
> >
>
> >
>
> > I have seen several Fail To Wire (FTW) switches in the past. I never
> found
> > them to be worthwhile, personally for a few reasons
>
> > - Only available in Copper. - You can't FTW optical since you need an OEO
> > conversion
>
> > - Failure scenarios were limited - Our sites didn't have backup power, so
> > it was pointless as we would lose the rest of the gear as well
>
> > Just my $.02
>
> > Kevin
>
> > On Mon, Jun 23, 2025 at 9:34 AM Craig Smith via NANOG
> nanog () lists nanog org
> >
>
> > wrote:
>
> > > Hello,
>
> > > Is anyone out there aware of a fail safe switch/router/1U server where
> upon
> > > power failure or watchdog event 2 ports would fail to pass through
> > > data, but could also be assigned an IP address and act as a bridge in
> > > "normal" mode? The desire is to have an appliance that could perform
> > > monitoring and send telemetry in between a customer device and an
> Internet
> > > connection but not create a single point of failure or require
> multiple ISP
> > > handoffs.
>
> > > Best,
>
> > > Craig
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