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AT-S84 Management Software User’s Guide
Section I: Using the Menus Interface 83
compatible.
Also note that a static trunk does not provide for redundancy or link
backup. If a port in a static trunk loses its link, the trunk’s total bandwidth is
diminished. Though the traffic carried by the lost link is shifted to one of the
remaining ports in the trunk, the bandwidth remains reduced until the lost
link is reestablished or you reconfigure the trunk by adding another port to
it.
Port Trunking
Guidelines
Observe the following guidelines when you create a port trunk:
A port trunk can consist of up to 8 ports, but must have a minimum of 2
ports.
The switch can support up to 4 trunks at a time.
A port can belong to only one trunk at a time.
The speed, duplex mode, and flow control settings must be the same
on all the ports in a trunk.
The ports of a trunk must be members of the same VLAN. A port trunk
cannot consist of ports from different VLANs.
The ports of a trunk do not have to be consecutive.
When you cable a trunk, the order of the connection should be
maintained on both nodes. The lowest numbered port in a trunk on the
switch should be connected to the lowest numbered port of the trunk
on the other device, the next lowest numbered port on the switch
should be connected to the next lowest numbered port on the other
device, and so on.
For example, assume that you are connecting a trunk between two
AT-9000/24 Gigabit Ethernet switches. On the first switch, you select
ports 1 through 4 for a trunk. On the second switch, you select ports 5
through 8. To maintain the order of the port connections, connect port
1 on the first switch to port 5 on the second switch, connect port 2 to
port 6, and so on.
To avoid compatibility problems, Allied Telesis recommends creating a
port trunk only between AT-9000/24 Gigabit Ethernet switches. A port
trunk between an AT-9000/24 Gigabit Ethernet switch and a device
from another manufacturer might result in undesirable trunk behavior.