Things appear to be somewhat random; however setting the
multicast_querier flag to 1 resulted in all my clustered spring back to
life:

for i in `seq 0 10`; do juju ssh $i "echo -n 1 | sudo tee
/sys/devices/virtual/net/juju-br0/bridge/multicast_querier"; done

Juju creates a bridge where this is not enabled by default.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1402763

Title:
  Multicast traffic not propating correctly over linux bridge

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