Symbol Technologies ES3000 Manuel D’Utilisation

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Administration Console Access
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3.5.27 Main Menu->Ports->Link Aggregation->LA Config 
Use the LA Configuration menu to define multiple links between switches to work as one virtual link 
or aggregate link. Trunks can be defined for similar port types only. For example, a 10/100 port cannot 
form a Port Trunk with a gigabit port. Spanning Tree treats trunked ports as a single virtual port.
Straight-though cables are required for all links in the trunk. Do not use crossover cables. 
Disable auto-negotiation on the ports in a trunk prior to setting up the trunk.