Public bug reported: When backup L3 agent in HA deployment is restarted, there is 20-30 seconds of data plane connectivity break to FloatingIP. It looks that during start of L3 agent, it first enable IPv6 forwarding: https://github.com/openstack/neutron/blob/master/neutron/agent/l3/namespaces.py#L106 and then disable it for non master node: https://github.com/openstack/neutron/blob/master/neutron/agent/l3/ha_router.py#L419 That cause send of MLDv2 packet:
08:38:29.815180 Out fa:16:3e:9e:de:0e ethertype IPv6 (0x86dd), length 112: :: > ff02::16: HBH ICMP6, multicast listener report v2, 2 group record(s), length 48 and that breaks somehow connectivity as packets are sent to backup node instead of master one. ** Affects: neutron Importance: Undecided Assignee: Slawek Kaplonski (slaweq) Status: Confirmed ** Tags: l3-ha -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1771841 Title: packet loss during backup L3 HA agent restart Status in neutron: Confirmed Bug description: When backup L3 agent in HA deployment is restarted, there is 20-30 seconds of data plane connectivity break to FloatingIP. It looks that during start of L3 agent, it first enable IPv6 forwarding: https://github.com/openstack/neutron/blob/master/neutron/agent/l3/namespaces.py#L106 and then disable it for non master node: https://github.com/openstack/neutron/blob/master/neutron/agent/l3/ha_router.py#L419 That cause send of MLDv2 packet: 08:38:29.815180 Out fa:16:3e:9e:de:0e ethertype IPv6 (0x86dd), length 112: :: > ff02::16: HBH ICMP6, multicast listener report v2, 2 group record(s), length 48 and that breaks somehow connectivity as packets are sent to backup node instead of master one. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1771841/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp