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[Bug 1547412] Re: Router interfaces exists on all the controllers after making L3 agent down on active controller i.e duplicate ip's present with duplication of ping

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Rodolfo Alonso <1547412@xxxxxxxxxxxxxxxxxx>
Date: Thu, 20 Oct 2022 08:31:07 -0000
Reply-to: Bug 1547412 <1547412@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1547412

Title:
  Router interfaces exists on all the controllers after making L3 agent
  down on active controller i.e duplicate ip's present with duplication
  of ping

Status in neutron:
  Won't Fix

Bug description:
  Steps to reproduce:
  1)Create a router
  2)Add router interface to subnet
  3)boot a vm
  4)create a floating ip and associate it to vm port id
  5)Make l3 agent down on active controller
  stack@padawan-ccp-c1-m2-mgmt:~$ neutron l3-agent-list-hosting-router 23ec6a25-b578-4630-86ba-3a544293385b
  ---------------------------------------------------------------------------------------
  id	host	admin_state_up	alive	ha_state
  ---------------------------------------------------------------------------------------
  5d47d95e-3750-4007-86b3-a724092cfd85	padawan-ccp-c1-m3-mgmt	True		active
  24dd994c-5e67-41b7-acd6-8766b50f838d	padawan-ccp-c1-m2-mgmt	True	xxx	standby
  ---------------------------------------------------------------------------------------
  stack@padawan-ccp-c1-m2-mgmt:~$ sudo ip netns exec qrouter-23ec6a25-b578-4630-86ba-3a544293385b ifconfig
  ha-b6dcf491-e6 Link encap:Ethernet HWaddr fa:16:3e:ce:ff:13
  inet addr:169.254.192.5 Bcast:169.254.255.255 Mask:255.255.192.0
  inet6 addr: fe80::f816:3eff:fece:ff13/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:3650 errors:0 dropped:391 overruns:0 frame:0
  TX packets:404 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:229496 (224.1 KiB) TX bytes:22476 (21.9 KiB)
  lo Link encap:Local Loopback
  inet addr:127.0.0.1 Mask:255.0.0.0
  inet6 addr: ::1/128 Scope:Host
  UP LOOPBACK RUNNING MTU:65536 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
  qg-3d627c6b-86 Link encap:Ethernet HWaddr fa:16:3e:70:95:f3
  inet addr:10.36.0.24 Bcast:0.0.0.0 Mask:255.255.0.0
  inet6 addr: fe80::f816:3eff:fe70:95f3/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:8961 errors:0 dropped:8 overruns:0 frame:0
  TX packets:249 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:600352 (586.2 KiB) TX bytes:20626 (20.1 KiB)
  qr-ba518ea4-f7 Link encap:Ethernet HWaddr fa:16:3e:9f:89:aa
  inet addr:7.7.7.1 Bcast:0.0.0.0 Mask:255.255.255.0
  inet6 addr: fe80::f816:3eff:fe9f:89aa/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:923 errors:0 dropped:1 overruns:0 frame:0
  TX packets:395 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:79946 (78.0 KiB) TX bytes:38625 (37.7 KiB)
  stack@padawan-ccp-c1-m3-mgmt:~$ sudo ip netns exec qrouter-23ec6a25-b578-4630-86ba-3a544293385b ifconfig
  ha-47cfce0e-c5 Link encap:Ethernet HWaddr fa:16:3e:db:39:24
  inet addr:169.254.192.6 Bcast:169.254.255.255 Mask:255.255.192.0
  inet6 addr: fe80::f816:3eff:fedb:3924/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:3223 errors:0 dropped:581 overruns:0 frame:0
  TX packets:833 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:196426 (191.8 KiB) TX bytes:46062 (44.9 KiB)
  lo Link encap:Local Loopback
  inet addr:127.0.0.1 Mask:255.0.0.0
  inet6 addr: ::1/128 Scope:Host
  UP LOOPBACK RUNNING MTU:65536 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
  qg-3d627c6b-86 Link encap:Ethernet HWaddr fa:16:3e:70:95:f3
  inet addr:10.36.0.24 Bcast:0.0.0.0 Mask:255.255.0.0
  inet6 addr: fe80::f816:3eff:fe70:95f3/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:2522 errors:0 dropped:0 overruns:0 frame:0
  TX packets:1059 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:213140 (208.1 KiB) TX bytes:98562 (96.2 KiB)
  qr-ba518ea4-f7 Link encap:Ethernet HWaddr fa:16:3e:9f:89:aa
  inet addr:7.7.7.1 Bcast:0.0.0.0 Mask:255.255.255.0
  inet6 addr: fe80::f816:3eff:fe9f:89aa/64 Scope:Link
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:1462 errors:0 dropped:0 overruns:0 frame:0
  TX packets:1035 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:132248 (129.1 KiB) TX bytes:97302 (95.0 KiB)

  ==================================================================
  checking if there is any loss in network traffic when L3 agent comes back. And verifying the master ownership of the HA router.

  There is a duplicate ip in the network
  Three things to discuss here, 
  1) Before making l3 agent down these are the status of controllers
  m2 = active 
  m1 = stand_by
  m3 = stand_by
  I made m2 l3 agent down and started again, There is a 4 packet loss and the status of the controllers ofter making m2 l3 agent down is 
  m2 = stand_by
  m1 = active
  m3 = active
  2 ) Before making l3 agent down,
  m1 = active
  m3 = active
  m2 standby
  I made l3 agent down of m1 and m3 controllers and started again, there is duplicate of ip address on controllers and there is no packet loss
  After making l3 agent down here is the status of the controllers
  m2 = active
  m1 = active
  m3 = active
  3) Before making m2's L3 agent down
  m2 = active
  m1 = active
  m3 = active
  stack@padawan-ccp-c1-m2-mgmt:~$ neutron l3-agent-list-hosting-router 1f9d90e8-8e5c-4b8a-aa8e-59f28edd2243
  ---------------------------------------------------------------------------------------
  id	host	admin_state_up	alive	ha_state
  ---------------------------------------------------------------------------------------
  5d47d95e-3750-4007-86b3-a724092cfd85	padawan-ccp-c1-m3-mgmt	True		active
  24dd994c-5e67-41b7-acd6-8766b50f838d	padawan-ccp-c1-m2-mgmt	True		active
  ---------------------------------------------------------------------------------------
  stack@padawan-ccp-c1-m2-mgmt:~$ neutron l3-agent-list-hosting-router 5b20094e-e734-4961-a2b9-4b7812d50c02
  ---------------------------------------------------------------------------------------
  id	host	admin_state_up	alive	ha_state
  ---------------------------------------------------------------------------------------
  a291a2fd-0a2b-4bc3-b04c-ab750e4ae8db	padawan-ccp-c1-m1-mgmt	True		active
  24dd994c-5e67-41b7-acd6-8766b50f838d	padawan-ccp-c1-m2-mgmt	True		active
  ---------------------------------------------------------------------------------------
  I made l3 agent down of m2 controller, and started again, there is a duplicate of ip address and duplicate of ping.
  64 bytes from 10.36.0.6: icmp_seq=1 ttl=62 time=2.72 ms
  64 bytes from 10.36.0.6: icmp_seq=1 ttl=62 time=2.75 ms (DUP!)
  64 bytes from 10.36.0.6: icmp_seq=2 ttl=62 time=1.33 ms
  64 bytes from 10.36.0.6: icmp_seq=3 ttl=62 time=0.648 ms
  64 bytes from 10.36.0.6: icmp_seq=4 ttl=62 time=0.707 ms
  64 bytes from 10.36.0.6: icmp_seq=5 ttl=62 time=0.658 ms

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References

[Bug 1547412] [NEW] Router interfaces exists on all the controllers after making L3 agent down on active controller i.e duplicate ip's present with duplication of ping
From: Abhishek G M, 2016-02-19