[FS#211] TP-Link WD8970 Ethernet switch cannot receive

[LEDE Bugs]

The following task has a new comment added:

FS#211 - TP-Link WD8970 Ethernet switch cannot receive
User who did this - dwmw2 (dwmw2)

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Arguably that configuration problem was actually a sysupgrade problem. This *used* to work and then went away in an upgrade. If we intend upgrades from OpenWRT to work, that should be considered a bug.

Why did we gain a new explicit enable_vlan option anyway? It seems to be redundant — why can't it be inferred from whether there are any vlans configured on the switch? And if you *are* going to have a redundant 'enable_vlan' option... can we make it *ignore* the vlan config on the switch in that case? I think there's a second bug there, too.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=211#comment625