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Multiple L3 Agents + DVR - YES, See :- http://schmaustech.blogspot.ru/2014/12/configuring-dvr-in-openstack-juno.html
Multiple External networks - YES, See :- http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/
VRRP - NO , See :- http://assafmuller.com/2014/08/16/layer-3-high-availability/

Multiple L3 Agents + DVR - YES, See :- http://schmaustech.blogspot.ru/2014/12/configuring-dvr-in-openstack-juno.html
Multiple External networks - YES, See :- http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/
VRRP - NO , See :- http://assafmuller.com/2014/08/16/layer-3-high-availability/

See also https://kimizhang.wordpress.com/2014/11/25/building-redundant-and-distributed-l3-network-in-juno/
DVR would make much more sense in configuration (Controller/Network)+Compute+Compute.

UPDATE 08/25/2015
Neither one of mentioned "Howtos" worked for me on RDO Kilo (Controller/Network)&Compute&Compute
Finally I found http://docs.ocselected.org/openstack-manuals/kilo/networking-guide/content/ha-dvr.html

Quote from Link above:-
DVR limitations
Distributed virtual router configurations work with the Open vSwitch Modular Layer 2 driver only for Juno.

END UPDATE

Multiple L3 Agents + DVR - YES, See :- http://schmaustech.blogspot.ru/2014/12/configuring-dvr-in-openstack-juno.html
Multiple External networks - YES, See :- http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/
VRRP - NO , See :- http://assafmuller.com/2014/08/16/layer-3-high-availability/

See also https://kimizhang.wordpress.com/2014/11/25/building-redundant-and-distributed-l3-network-in-juno/
DVR would make much more sense in configuration (Controller/Network)+Compute+Compute.

UPDATE 08/25/2015
Neither one of mentioned "Howtos" worked for me on RDO Kilo (Controller/Network)&Compute&Compute
Finally I found http://docs.ocselected.org/openstack-manuals/kilo/networking-guide/content/ha-dvr.html

Quote from Link above:-
DVR limitations
Distributed virtual router configurations work with the Open vSwitch Modular Layer 2 driver only for Juno.
************************************************************
I sincerely apologize for providing outdated information
************************************************************

END UPDATE

Multiple L3 Agents + DVR - YES, See :- http://schmaustech.blogspot.ru/2014/12/configuring-dvr-in-openstack-juno.html
Multiple External networks - YES, See :- http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/
VRRP - NO , See :- http://assafmuller.com/2014/08/16/layer-3-high-availability/

See also https://kimizhang.wordpress.com/2014/11/25/building-redundant-and-distributed-l3-network-in-juno/
DVR would make much more sense in configuration (Controller/Network)+Compute+Compute.

UPDATE 08/25/2015
Neither one of mentioned "Howtos" worked for me on RDO Kilo (Controller/Network)&Compute&Compute
Finally I found http://docs.ocselected.org/openstack-manuals/kilo/networking-guide/content/ha-dvr.html

Quote from Link above:-
DVR limitations
Distributed virtual router configurations work with the Open vSwitch Modular Layer 2 driver only for Juno.
************************************************************
I sincerely apologize for providing outdated information
************************************************************

END UPDATE

Multiple L3 Agents + DVR - YES, YES (only on Juno), See :- http://schmaustech.blogspot.ru/2014/12/configuring-dvr-in-openstack-juno.html
Multiple External networks - YES, See :- http://blog.oddbit.com/2014/05/28/multiple-external-networks-wit/
VRRP - NO , See :- http://assafmuller.com/2014/08/16/layer-3-high-availability/

See also https://kimizhang.wordpress.com/2014/11/25/building-redundant-and-distributed-l3-network-in-juno/
DVR would make much more sense in configuration (Controller/Network)+Compute+Compute.