Attempts to upgrade from train to any of the ussuri package versions in the ussuri-staging PPA [1] hit the bug or a similar bad state of routers (both routers are DOWN, or both are UP with no IP address, or one is DOWN and one is UP with no IP address).
So I think this might be an issue between 15.3.4 and commit 3e8abb9a8f (the latter being the upstream commit that the earliest package snapshot in ussuri-staging is based on).
UPDATE: This was a bad test as I didn't account for db migrations.
Update on testing results from my end, based on https:/ /bugs.launchpad .net/ubuntu/ +source/ neutron/ +bug/1927868/ comments/ 19.
Attempts to upgrade from train to any of the ussuri package versions in the ussuri-staging PPA [1] hit the bug or a similar bad state of routers (both routers are DOWN, or both are UP with no IP address, or one is DOWN and one is UP with no IP address).
[1] https:/ /launchpad. net/~ubuntu- cloud-archive/ +archive/ ubuntu/ ussuri- staging/ +packages? field.name_ filter= neutron& field.status_ filter= &field. series_ filter=
So I think this might be an issue between 15.3.4 and commit 3e8abb9a8f (the latter being the upstream commit that the earliest package snapshot in ussuri-staging is based on).