I run multiple L3 agents on one network node. I use OVS+GRE on Havana.

These multiple L3 agents affect each other. I have 2 external routers and network, which ever agent that is started last modifies interfaces in other qrouter namespaces, causing only the last started agent work.

# cat l3_agent-2.ini
[DEFAULT]
host = network-psuedo2
external_network_bridge = br-ex-2
metadata_port = 8775
handle_internal_only_routers = False
gateway_external_network_id = cc4ad4e0-e86e-43cf-bcd8-36de71be8b01
# OVS
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

# cat l3_agent.ini
[DEFAULT]
host = network
external_network_bridge = br-ex
metadata_ip = xxx.yy.zz.13
metadata_port = 8775
gateway_external_network_id = 9de13fee-fdcf-4343-9a8b-9f04deaf0d41
# OVS
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

Any ideas? thanks Probably same as https://bugs.launchpad.net/neutron/+bug/1257800