Routing east-west traffic between instances
In the network world, east-west traffic is traditionally defined as server-to-server traffic. In Neutron, as it relates to distributed virtual routers, east-west traffic is the traffic between instances in different networks owned by the same tenant. In the legacy model, all traffic between different networks traverses a virtual router located on a centralized network node. With DVR, the same traffic bypasses the network node and goes directly between the compute nodes hosting the virtual machine instances.
Reviewing the topology
Logically speaking, a distributed virtual router is a single router object connecting two or more tenant networks, as shown in the following diagram:
Figure 9.3
In the following ...
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