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diff --git a/src/lib/log/logger_level.h b/src/lib/log/logger_level.h
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+// Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef LOGGER_LEVEL_H
+#define LOGGER_LEVEL_H
+
+#include <string>
+
+namespace isc {
+namespace log {
+
+/// \brief Severity Levels
+///
+/// Defines the severity levels for logging.  This is shared between the logger
+/// and the implementations classes.
+///
+/// N.B. The order of the levels - DEBUG less than INFO less that WARN etc. is
+/// implicitly assumed in several implementations.  They must not be changed.
+
+typedef enum {
+    DEFAULT = 0,    // Default to logging level of the parent
+    DEBUG = 1,
+    INFO = 2,
+    WARN = 3,
+    ERROR = 4,
+    FATAL = 5,
+    NONE = 6    // Disable logging
+} Severity;
+
+/// Minimum/maximum debug levels.
+
+const int MIN_DEBUG_LEVEL = 0;
+const int MAX_DEBUG_LEVEL = 99;
+
+/// \brief Log level structure
+///
+/// A simple pair structure that provides suitable names for the members.  It
+/// holds a combination of logging severity and debug level.
+struct Level {
+    Severity    severity;   ///< Logging severity
+    int         dbglevel;   ///< Debug level
+
+    Level(Severity sev = DEFAULT, int dbg = MIN_DEBUG_LEVEL) :
+        severity(sev), dbglevel(dbg)
+    {}
+
+    // Default assignment and copy constructor is appropriate
+};
+
+/// \brief Returns the isc::log::Severity value represented by the given string
+///
+/// This must be one of the strings "DEBUG", "INFO", "WARN", "ERROR", "FATAL" or
+/// "NONE". (Case is not important, but the string most not contain leading or
+/// trailing spaces.)
+///
+/// \param sev_str The string representing severity value
+///
+/// \return The severity. If the string is not recognized, an error will be
+///         logged and the string will return  isc::log::INFO.
+isc::log::Severity getSeverity(const std::string& sev_str);
+
+}   // namespace log
+}   // namespace isc
+
+#endif // LOGGER_LEVEL_H