Under certain circumstances, a temporary (less than a second) loop condition exists when an MLAG port becomes operational, but before the remote MLAG peer installs the ISC blocking filter (see ISC Blocking Filters). MLAG linkup isolation addresses this condition by preventing any flood traffic (broadcast, unknown, unicast, etc.) received on a just operational MLAG port from being forwarded to ISC ports until the remote MLAG peer installs the ISC blocking filter.