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The L3 agent uses ARP and static routes like a normal router would. The L2
agent is where there might be differences depending on the network type
used. If it's a tunnel overlay, the L2 agent may perform an ARP offload
from information it has learned via the L2 population mechanism.

On Sat, Mar 7, 2015 at 4:02 AM, Leo Y <minherz at gmail.com> wrote:

> Hello, I am looking to learn how neutron agent (probably L3) calculates a
> new routing path when VM on compute node wants to communicate with some
> destination. Does it use neutron API to learn about network topology or it
> uses its internal structures to simulate path resolving like in real
> network? If the latter is correct, then what happens when a network
> topology is changed in neutron DB (due user intervention for by other
> actions) and the "local" data is invalid?
>
>
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-- 
Kevin Benton
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