Network card with relay in case of power failure

William Herrin bill at
Thu Jun 18 17:59:04 UTC 2020

On Wed, Jun 17, 2020 at 1:15 PM Dovid Bender <dovid at> wrote:
> I am sorry if this is off topic.I was once demoed a network device
> that had two interfaces. The traffic would go through the device.
> If there was a power cut or some other malfunction there would be
> a relay that would physically bridge the two network interfaces so the
> traffic would flow as if it was just a network cable. Is anyone aware of
> such a network card or device?

You can also do this with any routing protocol by including a bypass
link and declaring the bypass higher cost than the one through your
potentially malfunctioning device. This has the benefit of not having
to care about whether the nature of the failure will affirmatively
trigger the bypass since it'd negatively triggered on the absence of

Bill Herrin

William Herrin
bill at

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