Configuring a BUM (broadcast, unknown unicast, multicast) filter should protect against these scenarios. These limit the level of this type of traffic to prevent you losing services during the storm.
description
https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-multicast.html
example config
https://kb.juniper.net/InfoCenter/index?page=content&id=KB30816