GS110EMX not tagging frames

Please also add a screenshot of the VLAN Membership config for the old VLAN, as I'm assuming some previous config remaining.

Here's the port membership for VLAN 1. The switch won't allow me to delete it, so I only assigned the tagged LAG to it.

As an FYI - I am working on the possibility (albeit unlikely) that my upstream router (a Mikrotik RB5009) is stripping the incoming vlan tags off of the packets before handing them to the pcap process. To test that, I attempted to set up a mirror port on the switch, but it appears that I can't use a member of a LAG group as a mirror source:

To follow up - I confirmed via a colleague running the same model of upstream router (a Mikrotik RB5009) that incoming tagged frames do appear in packet captures with their VLAN tags intact, which brings me back to the assertion that the switch is not tagging frames as it is configured to do.

As mentioned above, the "gold-standard" confirmation, which would be to examine the traffic via a mirror port, cannot be done since the switch doesn't appear to allow a member of an LACP bundle to be used as a mirror port source. Is this a known caveat or is there a workaround?

In my prior post here I described an issue I'm having with my GS110EMX, which is not tagging frames on a trunked interface despite an apparently valid configuration. This switch is running 

Yesterday, reading the documentation of another vendor's switch, I came on a setting on that device where the switch did not tag frames if the vlan matched the port's PVID. Given that at the time (our teenager was in the middle of an intense online game), I decided to test this with a new VLAN.

The setup (screenshots below) is as follows:

Port 2 untagged on VLAN 10, PVID set to 10

Ports 1-6, 9, 10 untagged on VLAN 2, PVID set to 2

Ports 7/8 (LAG 1, LACP) tagged on VLANS 2 and 10, PVID set to 2.

I plugged my laptop into Port 2, and ran several packet captures from both my client and the upstream router (a Mikrotik RB5009) during my testing. Some interesting (and maddening) results came from this:

• Traffic from untagged VLAN 2 ports appeared up the upstream router untagged, as previously observed.
• Broadcast DHCP requests from my laptop did not appear on the upstream router, at all. No traffic tagged with VLAN 10 was seen (caveat: I did not test the forwarding of non-broadcast traffic sent from my laptop into port 2 using a static IP configuration on the DHCP client).

Attached below is a series of screenshots showing the configuration and the resulting PCAPs. Is there anything I'm missing, or is this a failure of the switch hardware itself? And yes, I did powercycle it to make sure that wouldn't change anything.

GS110EMX configuration:

LACP configuration for LAG 1 on Ports 7-8:

LAG 1 Enabled and set to LACP

Ports 7,8 assigned to LAG 1

LACP System Priority set to default 32768

LACP Priority and Timeout set to default 128/Long

801.Q Configuration:

Basic Port-Based VLAN Status disabled

Basic 802.1Q VLAN Status disabled

802.1Q Configuration:

VLAN Configuration showing VLAN membership status for all VLANs: VLAN 1 with no port members; VLAN 2 with all ports as members, VLAN 10 with ports 2,7-8 as members.

VLAN Membership for VLAN 2 - Ports 1,3-6,9-10 untagged, Ports 7-8 (LAG 1) tagged

VLAN Membership for VLAN 10 - Port 2 untagged, Ports 7/8 (LAG 1) tagged

Port PVID configuration: Port 2 PVID set to 10, all others set to 2

Client sending broadcast DHCP Discover requests to untagged Port 2. These packets did not appear in a pcap on the upstream router running at the same time.