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Regarding your question about LLDP and IPv6...
The default Ubuntu 18.04.3 configuration has an IPv6 enabled kernel, but the interface only has the default link local address configured. I've seen it do router solicitation on link state changes and periodically thereafter. I think I recall seeing somewhere above that you were going to try without IPv6. Have you seen different behavior with IPv6 disabled?
I don't expect to see LLDP because I have the two NICs wired directly to each other, back to back. I'm not running any LLDP daemon on the host.