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Note: When VPC VR route's packet to destination subnet, it may raise ARP request to get the MAC address of destination VM. VPC VR then forward's the packet with an ethernet header where source mac is gateway's mac address and destination mac is that of destination VM. With logical router though ARP can not be performed, end result is achieved with a flow to modify both source and destination mac address for the flow. A flow rule is required for each VM's in the subnet. Downside with this approach is for each VM created a flow rule need to be added on all hosts on which subnet/tier spans. 

Assuming tier1, tier 2 and tier3 has subnets 10.1.1.0/24, 10.1.2.0/24 and 10.1.3.0/24 respectively and corresponding bridges for the tiers are connected to logical routers on openflow ports 1,2,3, flow table would look like below with no ingress and egress rules configured.

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