Allied Telesis AT-S106 - Manual (Page 91)

AT-S106 Management Software Web Browser User’s Guide
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ports, and the others are placed in the standby mode. If an active link goes
down on a active port, the standby port with the next highest priority is
automatically activated to take its place.
The selection of the active links in an aggregate trunk is dynamic and
changes as links are added, removed, lost, or reestablished. For example,
if an active port loses its link and is replaced by another port in the standby
mode, the reestablishment of the link on the originally active port causes
the port to return to the active state by virtue of having a higher priority
value than the replacement port, which returns to the standby mode.
Two conditions must be met for a port in an aggregate trunk to function in
the standby mode. First, the number of ports in the trunk must exceed the
highest allowed number of active ports and, second, the port must be
receiving LACPDU packets from the other device. A port functioning in the
standby mode does not forward network traffic. However, it continues to
send LACPDU packets. If a port that is part of an aggregator does not
receive LACPDU packets, it functions as a normal Ethernet port and
forwards network packets along with LACPDU packets.
Note
You can adjust the value of a port’s priority.