This records the sysUpTime at which this specific remote destination address entry was added to the association's multihoming address list, the remote-side counterpart to cSctpAssocLocalAddressStartTime. It's useful for confirming when a secondary remote address became known to this association, such as verifying a newly-added backup path was actually registered at the time a change request claims it was made. An address entry whose start time is much more recent than the association's own cSctpAssocStartTime indicates that address was learned or added dynamically well after the association was first established.