At home,I use rb260gs (old model v1.7) at input side, to concentrate wan internet data with TV - each coming through separate port.
Tagged as two separte VLANs (set by Default vlan and Add-if-missing for port, Always-strip in vlan list),
both vlans pass SFP (with Add-if-missing in vlan list) fibre tagged and through some lan switches to room with TV (and WAN to another room with firewall).
On TV side, there sits another rb260gs and puts TV vlan out untagged (vlan mode strict, and in vlan list Always-strip).
It WORKS like a charm - WITH OLD RB260gs,
and it works also with RB951G wifi wouter (where vlan is set only in Switch menu and not including "switch1-cpu", so it is transparent).
But I am here now, trying to figure why it DOES NOT WORK with new so-called RB260gs - which is in fact CSS106-5G-1S.
At the moment I bring new CSS106-5G-1S and put there, it did work for a while, but then upgraded to v2.5 (from v2.0) swOS.
I am pretty unsure but I think it still worked after upgrade.
But since next day it stopped.
I may just guess that provider found something like RTSP or whatever on his side, and blocked it?
Anyway, at the moment I just swap CSS106-5G-1S for RB951G, it (TV) works again, and once I put CSS106-5G-1S there it stops immediately.
The strangest fact is, that TV can see EPG data (e.g. Stations, Just playing, time..), but no Audio and Video appear.
I suppose that multicast/broadcast is somehow blocked by CSS106-5G-1S, but no attempt to set params, disable RTSP, changing IVL/SVL learning and so, did help.
EDIT: If I turn TV on and start watching some channel using RB951g, and re-plug CSS106-5G-1S in place then,
the TV keeps playing that single channel. If it change channel, screen turn black, but if I return to played one again, it still works.
Pretty sure something BLOCKED CHANGE to new multicast/manycast path, Imean establishing new one, but did it did not broke existing path once established.
EDIT2: after DOWNGRADE to v2.3 swOS it started working, everything is normal now. I did not touch any configuration, just put older firmware.
In this thread it may be and answer - do not use CSS106-5G-1S yet, but You can use pretty all other devices including OLD rb260gs.
For me, it is question and I need help.