This variable indicates the length of time the backup peer
remains connected after the primary peer connection has
been re-established. If this variable is zero, the backup peer
will be disconnected immediately after the primary peer connection
has been re-established. If greater than zero the backup will
stay connected for the number of minutes indicated by this variable,
after the primary peer connection has been re-established.
Note that the linger interval is only used when
cdeTConnConfigBackupLinger is true.