It seems as if this bug surfaces due to load issues. While the fix
provided by Venkata (https://review.openstack.org/#/c/522641/) should
help clean things up at the time of l3 agent restart, issues seem to
come back later down the line in some circumstances. xavpaice mentioned
he saw multiple routers active at the same time when they had 464
routers configured on 3 neutron gateway hosts using L3HA, and each
router was scheduled to all 3 hosts. However, jhebden mentions that
things seem stable at the 400 L3HA router mark, and it's worth noting
this is the same deployment that xavpaice was referring to.

It seems to me that something is being pushed to it's limit, and
possibly once that limit is hit, master router advertisements aren't
being received, causing a new master to be elected. If this is the case
it would be great to get to the bottom of what resource is getting
constrained.

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https://bugs.launchpad.net/bugs/1731595

Title:
  L3 HA: multiple agents are active at the same time

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