Allied Telesis AT-S63 - Manual (Page 80)

Chapter 5: Static Port Trunks
80 Section I: Basic Operations
Guidelines
The following guidelines apply to static trunks:
ˆ Allied Telesis recommends limiting static port trunks to Allied Telesis
network devices to ensure compatibility.
ˆ A static trunk can have up to eight ports.
ˆ Stand-alone switches can support up to six static and LACP trunks at a
time (for example, four static trunks and two LACP trunks). An LACP
trunk is countered against the maximum number of trunks only when it
is active.
ˆ Stacks of AT-9400 Basic Layer 3 Switches and the AT-StackXG
Stacking Module can support up to six static port trunks.
ˆ The ports of a static trunk must be of the same type of either twisted
pair or fiber optic ports.
ˆ The ports of a trunk can be either consecutive (for example Ports 5-9)
or nonconsecutive (for example, ports 4, 8, 11, 20).
ˆ The ports of static port trunks on stand-alone switches or switches in
an enhanced stack must be from the same switch.
ˆ The ports of a static port trunk in a stack of AT-9400 Basic Layer 3
Switches and the AT-StackXG Stacking Module can be from different
switches in the same stack.
ˆ Before creating a port trunk, examine the speed, duplex mode, flow
control, and back pressure settings of the lowest number port to be in
the trunk. Verify that its settings are correct for the device to which the
trunk will be connected. When you create a static port trunk, the
management software copies the current settings of the lowest
numbered port in the trunk to the other ports, because all ports in a
static trunk must have the same settings. For example, if you create a
port trunk consisting of ports 5 to 8, the parameter settings for port 5
are copied to ports 6, 7, and 8 so that all the ports of the trunk have the
same settings.
ˆ After creating a port trunk, do not change the speed, duplex mode,
flow control, or back pressure of any port in the trunk without also
changing the other ports.
ˆ A port can belong to only one static trunk at a time.
ˆ A port cannot be a member of a static trunk and an LACP trunk at the
same time.
ˆ The ports of a static trunk must be untagged members of the same
VLAN. A trunk cannot consist of untagged ports from different VLANs.
ˆ The switch selects the lowest numbered port in the trunk to handle
broadcast packets and packets of unknown destination. For example,
a trunk of ports 11 to 15 would use port 11 for broadcast packets.