Add network bridge to Hetzner VSwitch public subnet (VLAN) via NetworkManager on CentOS 8

nmcli_create_hetzner_subnet_vswitch_bridge.sh

# Add your real IPv4 subnet settings here
IPV4=X.X.X.X
CIDR=X.X.X.X/28
GATEWAY=X.X.X.X
DNS=1.1.1.1

# Add your real Interface settings here
INTERFACE_NAME="enp2s0"
VLAN_ID=4000
VLAN_INTERFACE_NAME="$INTERFACE_NAME.$VLAN_ID"
VLAN_BRIDGE_NAME="br$VLAN_ID"

# Add vswitch routing table
echo "1 vswitch" >> /etc/iproute2/rt_tables

# Add bridge
nmcli c a type bridge con-name "$VLAN_BRIDGE_NAME" ifname "$VLAN_BRIDGE_NAME" ip4 "$CIDR"

# Add VLAN interface
nmcli c a type vlan con-name "$VLAN_INTERFACE_NAME" ifname "$VLAN_INTERFACE_NAME" dev enp2s0 id $VLAN_ID master "$VLAN_BRIDGE_NAME" slave-type bridge

# Set MTU of VLAN interface
nmcli c m "$VLAN_INTERFACE_NAME" 802-3-ethernet.mtu 1400

# Add IP/Gateway to bridge
nmcli c m "$VLAN_BRIDGE_NAME" ipv4.addresses "$CIDR"

# Add DNS to bridge
nmcli c m "$VLAN_BRIDGE_NAME" ipv4.dns "$DNS"

# Add default route to bridge in table "1"
nmcli c m "$VLAN_BRIDGE_NAME" ipv4.routes "0.0.0.0/0 $GATEWAY table=1"

# Add routing rules for $IPV4
# ATTENTION: MAYBE YOU HAVE TO ADJUST THE PRIORITY. I HAD SOME PROBLEMS WHEN IT ALREADY EXISTS...
nmcli c m "$VLAN_BRIDGE_NAME" ipv4.routing-rules "priority 32765 from $IPV4 table 1"
nmcli c m "$VLAN_BRIDGE_NAME" +ipv4.routing-rules "priority 32764 from all to $IPV4 table 1"