DGS-3120 Series

Ensure you've updated the firmware to R2.00.010 or higher.
Make the stacking master static;
1. System Configuration -> Stacking -> Stacking Mode Settings.
2. Change 'Force Master Role' to 'Enabled'.
Enable flow-control;
1. System Configuration -> Port Configuration -> Port Settings.
2. Set 'Flow Control' to 'Enabled' for all ports on both switches.
3. Confirm with dmesg |grep -i flow and look for e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx. If any interfaces show Flow Control: None, it's not setup right.
Setup VLANs for the SN and IFN (leave the BCN on the default VID 1).
1. L2 Features -> VLAN -> 802.1Q VLAN Settings
2. For each VLAN;
  1. Click 'Add/Edit VLAN' tab.
  2. Enter a unique VID (100 for SN, 101 for IFN).
  3. Set a unique VLAN name.
  4. Change the ports in the VLAN to the 'untagged' radio button and leave the rest as 'Not Member'.
  5. Leave 'Advertisement' as 'Disabled'.
  6. Click 'Apply' and repeat for the other VLAN.
Setup a static trunk for the two uplink ports;
1. L2 Features -> Link Aggregation -> Port Trunking Settings.
2. Use 'MAC Source' algorithm.
3. Set a unique Group ID.
4. Set the 'Type' of "Static".
5. Set the master port (usually 1:24).
6. Change 'State' to "Enabled".
7. Check to enable the appropriate ports (usually 1:24 and 2:24).
Save your changes!
1. 'Save' -> 'Save Configuration / Log'.
2. Change 'Type' to "All" and click 'Apply'.

Any questions, feedback, advice, complaints or meanderings are welcome.
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D-Link Notes