I have an MX with a LAN setting of "VLANs" (as opposed to Single LAN) with only one VLAN configured, VLAN 1. All ports on the MX are configured as Trunk with native VLAN set to VLAN 1.
I'd like to introduce a Voice VLAN to this network which I will add as VLAN 65 and leave the MX ports configured as they currently are.
The VoIP phones are all connected to a Meraki switch and the Meraki switch is connected to the MX. The phones all have a PC attached to them. The plan is to configure the ports on the Meraki switch as access ports and set the data and voice VLAN appropriately.
The rest of the network consists of unmanaged switches connected directly to the MX. So this network is currently flat with no VLAN tagging.
My question is about what happens when I set the data VLAN to VLAN 1 on the Meraki switch ports used by the phones. I know the switch will tag the phone traffic as VLAN 65 when it forwards phone traffic to the MX, but will it actually "tag" the data (PC) traffic as VLAN 1 when it forwards to the MX or does the switch know that VLAN 1 is the native (untagged) VLAN and leave it untagged?
Essentially trying to figure out if a Voice VLAN can be added without affecting the untagged nature of the current flat data network.