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Instances alternative gateway / VLAN tags corresponding datacenter VLANs

Hello All I have two questions regarding Neutron:

1) In the documentation I always see diagrams where the network traffic from all the instances is routed through the network node. For example here:

Is it possible to configure a different gateway for the instances that the gateway is the real physical router and skip the way through the network node?

2) If there are VLANs created in the physical switches is it possible to create this VLANs also in the OpenStack/Neutron environment to match the datacenter VLANs?

Thank you!