It would be awesome if the first iteration of a ARP lookup, ICMP
echo and ICMP reply on a newly created instance was always
successful. Sadly this is not the reality.
This is useful for validating deployments with OVN where it is not
required to have external networking attached to every chassis.
Any chassis that does not have external networking directly
attached will forward traffic destined for the external network
through a tunnel to a chassis that does.
Frode Nordahl
Chris MacNaughton