Allied Telesis AT-S62 - Manual (Page 137)

AT-S62 Management Software Menus Interface User’s Guide
Section I: Basic Operations 137
from another manufacturer; but there is the possibility that the
implementations of static trunking on the two devices might not be
compatible.
It should also be noted that this type of 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 reduced. 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.
Static Port Trunk Guidelines
Here are the guidelines to creating a static trunk:
ˆ Allied Telesyn recommends using static port trunks between Allied
Telesyn networking devices to ensure compatibility. While an Allied
Telesyn device might be able to form a static trunk with a device from
another equipment vendor, the implementations might not be fully
compatible, resulting in undesirable switch behavior.
ˆ A static trunk can contain up to eight ports.
ˆ The ports of a static trunk must be of the same medium type. They can
be all twisted pair ports or all 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 Before creating a port trunk, examine the speed, duplex mode, flow
control, and back pressure settings of the lowest number port that will
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 Once you have created a port trunk, do not change the speed, duplex
mode, flow control or back pressure of any port in the trunk without
making the same change to 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 a LACP trunk at the
same time.
ˆ The switch 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.