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There are answers on the mailing list thread Neutron agent internal data structures.

There are answers on the mailing list thread Neutron agent internal data structures.. Salvatore Orlando said:

Every agent keeps anyway an in-memory state throughout its execution. The agents indeed have no persistent storage - at least not in the usual form of a database. They however rely on data other than the neutron database.

For instance for the l2 agent, ovsdb itself is a source of information. The agent periodically scans it to detect interfaces which are brought up or down. As another example the dhcp agent stores its current state a 'data' directory (if you're using devstack it's usually /opt/stack/data/neutron/dhcp)