This notification is generated when the fsBfdSessState object for one or more contiguous entries in fsBfdSessTable are about to enter the down(2) or adminDown(1) states from some other state. The included values of fsBfdSessDiag MUST both be set equal to this new state (i.e: down(2) or adminDown(1)). The included values of fsBfdSessInterface MUST be set equal to interface index of bfd session(i.e: index(2)). The included values of fsBfdSessIfname MUST be set equal to interface name of bfd session(i.e: name(GigabitEthernet 0/1)). The two instances of fsBfdSessDiag in this notification indicate the range of indexes that are affected. Note that all the indexes of the two ends of the range can be derived from the instance identifiers of these two objects. For cases where a contiguous range of sessions have transitioned into the down(2) or adminDown(1) states at roughly the same time, the device SHOULD issue a single notification for each range of contiguous indexes in an effort to minimize the emission of a large number of notifications. If a notification has to be issued for just a single fsBfdSessEntry, then the instance identifier (and values) of the two fsBfdSessDiag objects MUST be the identical.