Allied Telesis AT-AR3050S, Installation Manual, Page: 25 / 80

Installation Guide for AT-AR3050S, AT-AR4050S Routers
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link to the building and connect a bypass port of the master router to an
ETH port of an identical backup router. The bypass port of the master
router is only active and in the bypass mode if:

The master router has no power supply or suffers an internal fault,
then the incoming WAN link is bypassed to the ETH port of the
backup router.

The master router is active but unable to boot because of some
critical issues, then the incoming WAN link is bypassed to the
backup router.

The router is under software control because of some trigger
events. For example, if the master router is active and a manual
override command is given via the CLI, then the incoming WAN
link is bypassed to the backup router.
Note that if the master router is active and is able to boot normally, then
the master router connects to the WAN link, the bypass port is inactive and
the backup router will not see a link to the WAN on its ETH port.