Public bug reported:
When the env contains both vlan and vxlan networks, if we enable l2pop and
arp_responder function, when we update a vlan port's ip（VM1）, the arp responder
for this port will be created in br-tun.
When other compute‘s vm（VM2） ping VM1, the first arp destination is
ff:ff:ff:ff:ff:ff, so every compute node will get this arp request, and because
of arp responder, they will all create a arp reply to the VM2, all these arp
reply packets will confuse physical switch, this will cause some network
connection problem.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1824504
Title:
arp responder will be created for a vlan port when port ip changed
Status in neutron:
New
Bug description:
When the env contains both vlan and vxlan networks, if we enable l2pop and
arp_responder function, when we update a vlan port's ip（VM1）, the arp responder
for this port will be created in br-tun.
When other compute‘s vm（VM2） ping VM1, the first arp destination is
ff:ff:ff:ff:ff:ff, so every compute node will get this arp request, and because
of arp responder, they will all create a arp reply to the VM2, all these arp
reply packets will confuse physical switch, this will cause some network
connection problem.
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