Later I do following: * singletoning neutron server to the node-1 * enabling debug on node-1 * restarting on node-1 server and agents some time l3-agent don't create router namespaces: root@node-1:/var/log/neutron# ip netns haproxy root@node-1:/var/log/neutron# neutron l3-agent-list-hosting-router router04 +--------------------------------------+--------+----------------+-------+ | id | host | admin_state_up | alive | +--------------------------------------+--------+----------------+-------+ | 021bce30-d7da-4143-bc61-0a2995a086ce | node-1 | True | :-) | +--------------------------------------+--------+----------------+-------+ root@node-1:/var/log/neutron# ip netns haproxy but some tome after: root@node-1:/var/log/neutron# neutron l3-agent-list-hosting-router router04 +--------------------------------------+--------+----------------+-------+ | id | host | admin_state_up | alive | +--------------------------------------+--------+----------------+-------+ | 021bce30-d7da-4143-bc61-0a2995a086ce | node-1 | True | :-) | +--------------------------------------+--------+----------------+-------+ root@node-1:/var/log/neutron# ip netns qrouter-8334420c-818c-4abb-9e78-3a9d12288f1a qrouter-8dd0cb25-054e-4373-a191-91cb8dbc9c64 haproxy root@node-1:/var/log/neutron# ip netns exec qrouter-8dd0cb25-054e-4373-a191-91cb8dbc9c64 ip a 1: lo: mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 80: qr-13a0e6db-b0: mtu 1500 qdisc noqueue state UNKNOWN link/ether fa:16:3e:91:5e:71 brd ff:ff:ff:ff:ff:ff inet 192.168.111.1/24 brd 192.168.111.255 scope global qr-13a0e6db-b0 valid_lft forever preferred_lft forever inet6 fe80::f816:3eff:fe91:5e71/64 scope link valid_lft forever preferred_lft forever 82: qg-19bc0777-d6: mtu 1500 qdisc noqueue state UNKNOWN link/ether fa:16:3e:10:76:fd brd ff:ff:ff:ff:ff:ff inet 10.77.11.130/24 brd 10.77.11.255 scope global qg-19bc0777-d6 valid_lft forever preferred_lft forever inet 10.77.11.138/32 brd 10.77.11.138 scope global qg-19bc0777-d6 valid_lft forever preferred_lft forever inet 10.77.11.139/32 brd 10.77.11.139 scope global qg-19bc0777-d6 valid_lft forever preferred_lft forever inet6 fe80::f816:3eff:fe10:76fd/64 scope link valid_lft forever preferred_lft forever root@node-1:/var/log/neutron# ip netns exec qrouter-8dd0cb25-054e-4373-a191-91cb8dbc9c64 ping 192.168.111.33 PING 192.168.111.33 (192.168.111.33) 56(84) bytes of data. From 192.168.111.1 icmp_seq=1 Destination Host Unreachable From 192.168.111.1 icmp_seq=2 Destination Host Unreachable From 192.168.111.1 icmp_seq=3 Destination Host Unreachable From 192.168.111.1 icmp_seq=4 Destination Host Unreachable From 192.168.111.1 icmp_seq=5 Destination Host Unreachable From 192.168.111.1 icmp_seq=6 Destination Host Unreachable ^C --- 192.168.111.33 ping statistics --- 9 packets transmitted, 0 received, +6 errors, 100% packet loss, time 8117ms pipe 3 root@node-1:/var/log/neutron# ip netns exec qrouter-8dd0cb25-054e-4373-a191-91cb8dbc9c64 ping 192.168.111.29 PING 192.168.111.29 (192.168.111.29) 56(84) bytes of data. From 192.168.111.1 icmp_seq=1 Destination Host Unreachable From 192.168.111.1 icmp_seq=2 Destination Host Unreachable From 192.168.111.1 icmp_seq=3 Destination Host Unreachable From 192.168.111.1 icmp_seq=4 Destination Host Unreachable From 192.168.111.1 icmp_seq=5 Destination Host Unreachable From 192.168.111.1 icmp_seq=6 Destination Host Unreachable ^C --- 192.168.111.29 ping statistics --- 6 packets transmitted, 0 received, +6 errors, 100% packet loss, time 5013ms pipe 3 root@node-1:/var/log/neutron#