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I have a wireless access point capable of VLAN tagging and am attempting to segregate traffic by SSID. My setup looks a little like this:

SSID 1 (Vlan 100)
SSID 2 (Vlan 101)

WAP -> Switch (port 2 tagged member of both Vlans) -> Switch (port 1 tagged member of both Vlans) -> Router

My switch is configured to allow tagged traffic into port 2 on both Vlans, port 1 is also a tagged member of both Vlans. My understanding is that all traffic from the WAP should flow out of my switch towards the router with Vlan tags intact. Both Vlans are configured the same, that is to say ports 1 and 2 are each tagged members of Vlan 100 and Vlan 101. What doesn't make any sense to me is that Vlan 101 is working fine but Vlan 100 traffic doesn't seem to egress the switch.

I've got a cheap TP Link SG108E and the best diagnostics I have is that when I attempt to connect to the SSID assigned to Vlan 100 I see rxErrors on ports 1 and 2 of the switch go up.

I'm under the impression I could have as many Vlans as I wanted on this port and pass them up to my router through a tagged port pair. Is there something fundamental that I've missed here?

Sam Gregory
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