yes switching between ha/non-ha is support so long as the router is in
admin state false at the time of change (which I believe is the case in
this issue).

Some further observations; switching a router from ha mode to non-ha
mode should remove all existing router agent hosting arrangements and
then re-schedule the new non-ha router on an appropriate agent.

In the cloud experiencing this issue, I see only one remaining qrouter
namespace but its also still got a keepalived and state monitor running
- which I don't think is right.

I'm wondering whether due to the sheer number of routers being hosted on
each network node, the router never gets removed before being
rescheduled back to the same node, resulting in the teardown being
skipped in someway.

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  Neutron integrated with OpenVSwitch drops packets and fails to
  plug/unplug interfaces from OVS on router interfaces at scale

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