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Objectives

Not met: The uplink (eth0) carries both VLAN 10 and VLAN 20 toward the physical network
Met: The web VMs (VLAN 10) reach the uplink
Not met: The DB VMs (VLAN 20) reach the uplink
Met: Web and DB VMs stay isolated from each other

# Hypervisor bridge: two VLANs of VMs, plus a trunk uplink (eth0) to the physical switch.
ip link add br0 type bridge vlan_filtering 1
ip link set vm-web1 master br0
ip link set vm-web2 master br0
ip link set vm-db1 master br0
ip link set eth0 master br0

# Access ports: each VM egresses its VLAN untagged.
bridge vlan add dev vm-web1 vid 10 pvid untagged
bridge vlan add dev vm-web2 vid 10 pvid untagged
bridge vlan add dev vm-db1 vid 20 pvid untagged

# Trunk uplink: carries VLAN 10 tagged... but VLAN 20 is missing, so the DB VM is stranded.
bridge vlan add dev eth0 vid 10

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