For the record:
Planet FGSW-2620VM (24 100Mb + 2 1Gb ports)
connected to Alix 2D13.
Got it setup with 2 VLANs for ISPs going to a single WAN port. Various VLANs for local subnets going to OPT1. A VLAN for the main local subnet connected directly without tagging to LAN.
Took a while to understand the web GUI of the Planet device and work out what some of the "English" meant. Don't buy one of these if you want a user-friendly setup GUI!
Don't use VLAN1 for an ordinary client VLAN - it seems to insist on sending stuff from VLAN1 ports to/from all over. I gave up trying to find more knobs to tweak to keep VLAN1 in its place.
In the end it does work - 2 ISPs are funneling through it to WAN, a bunch of internal subnets are on LAN and OPT1. And it was a reasonable price and available in Nepal.
I have an all-Gb port fancier model coming soon, will give an assessment of that next week…
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