Proxmox VE and VLAN tag stacking

https://forum.proxmox.com/threads/proxmox-bridge-mtu-issue.51148/#post-293884

On that threat you will find my post and configs, there you will notice that I'm using QinQ.

My topology there is like:

Code:
vFirewall (OpnSense) <> vmbrXX <> vmbrY <> CiscoNexus 3548X <> Juniper MX
                      |        |        |                    |
                      V        |        V                    V
                   vTrunk      |    LACP Bond            LACP Bond
                               |     (Trunk)              (Trunk)
                               V
                   vmbrXX (slave Port is vmbrY.xx
                     No need to declar it on vmbrY)

For QinQ MTU is critical review that.

My solution is a 3 PVE nodes in a Cluster and using QinQ simplify the connection between VMs and services. Ones a vlan is created on the physical switches (S-Tag) that vlan became a transport for PVE vSwitch with all the vlans (C-Tags) piggy back ride.

In realty there are two Nexus in vPC toward each PVE host for redundancy. Also two MXs... to avoid SPOF
This link will give you and idea:
https://www.packetflow.co.uk/what-is-cisco-vpc-virtual-port-channel/

I didn't fully read the thread but hope that give you some guide.
 
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