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
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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.
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https://bugs.launchpad.net/neutron/+bug/1771841/+subscriptions
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