Buffalo TeraStation User Manual page 46

To configure port trunking,
1
Connect LAN port 1 on the TeraStation to a port on the switch. Do not connect LAN port 2 yet.
2
In the Web Admin interface, navigate to [Network] - [Settings] - [Port Trunking].
3
Under [Port Trunking], click on [Modify Settings].
4
Connect LAN port 2 on the TeraStation to the switch.
5
Press the TeraStation's power button twice within 3 seconds to turn it off. Press it again to restart the TeraStation.
Port Trunking is now configured.
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