Allied-telesis AT-GS950/16 User Manual download pdf (Page 101)

AT-GS950/16 Web Interface User Guide

101

Network equipment vendors tend to employ different techniques to

implement static trunks. Consequently, a static trunk on one device may

be incompatible with the same feature on a device from a different

manufacturer. For this reason, static trunks are typically employed only

between devices from the same vendor. That is not to say that an Allied

Telesis Layer 2 managed switch cannot form a static trunk with a device

from another manufacturer; however, the implementations of static

trunking on the two devices may be incompatible.

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. Although 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 re-established or you reconfigure the trunk by adding another

port to it.

General Guidelines

Following are the guidelines for creating a static trunk:

 Allied Telesis recommends setting static port trunks

between Allied Telesis networking devices to ensure

compatibility.

 A static trunk can contain up to 10 ports.

 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, but not a combination of the two.

 The ports of a trunk can be either consecutive (for

example, Ports 2 through 4) or nonconsecutive (for

example, ports 3, 5, and 7).

 Before creating a port trunk, verify that the settings are

the same for all ports in the trunk including speed

(1000/Full), duplex mode, flow control, back pressure

settings and VLAN membership. If these settings are

not the same, then the switch does not allow you to

create the trunk.

Note

When a trunk group is formed with only combo ports as members, all

port members are configured to the forced port mode at 1000/Full.

The trunk ports on the connecting network switch should also be

configured for 1000/Full to insure speed and duplex compatibility

between the switches.

 After you have created a port trunk, a change to the

speed, duplex mode, flow control, or back pressure of

any port in the trunk automatically implements the

same change on all the other member ports.

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