Moving to High as we have a workaround in place, although we are still hitting this on occasion in CI.
I don't think changing the rpc timeout is a solution to this either. We don't know how far apart the l3-agent and server are going to start, so the rpc timeout would have to be extremely high. l3-agent should continue retrying to contact neutron-server until it is successful. There's really no reason I can see for that to be a hard failure like this.
Moving to High as we have a workaround in place, although we are still hitting this on occasion in CI.
I don't think changing the rpc timeout is a solution to this either. We don't know how far apart the l3-agent and server are going to start, so the rpc timeout would have to be extremely high. l3-agent should continue retrying to contact neutron-server until it is successful. There's really no reason I can see for that to be a hard failure like this.