Currently, Neutron metadata agent connect Neutron server via REST API using python-neutron client.
This is ineffective as then Keystone is involved into the whole process (i.e. authentocation and extra load at Keystone)
There is the following fix for this bug: Neutron metadata agent was reworked to use RPC to connect to server.
Meg, this summary is for you:
Currently, Neutron metadata agent connect Neutron server via REST API using python-neutron client.
This is ineffective as then Keystone is involved into the whole process (i.e. authentocation and extra load at Keystone)
There is the following fix for this bug: Neutron metadata agent was reworked to use RPC to connect to server.