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 <[email protected]> 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? > > > __________________________________________________________________________ > OpenStack Development Mailing List (not for usage questions) > Unsubscribe: [email protected]?subject:unsubscribe > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > -- Kevin Benton
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