ZyXEL Communications ZyWALL 110 Handbook page 439

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Updelay is the time to wait to enable the slave port after the device detects the link
recovery.
Downdelay is the time to wait to disable the slave port after the device detects the link
failure.
The taget IP can be the Layer 3 device or the host IP, can be reachable by the USG.
802.3ad (LACP) Mode:
(Both devices need to be configured. Only one switch can be used. The port speed
and duplex must be the same.)
The USG should be connected to only one switch and its settings should be the same
as the switch. This utilizes all slave network interfaces in the active aggregator group
according to the 802.3ad specification.
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