Network Working Group F. Strauss Internet-Draft TU Braunschweig Expires: November 27, 2003 J. Schoenwaelder International University Bremen May 29, 2003 SMIng Core Modules draft-irtf-nmrg-sming-modules-02 Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http:// www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on November 27, 2003. Copyright Notice Copyright (C) The Internet Society (2003). All Rights Reserved. Abstract This memo presents an SMIng module that introduces core data types such as counters, date and time related types, and various string types. Strauss & Schoenwaelder Expires November 27, 2003 [Page 1] Internet-Draft SMIng Modules May 2003 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. NMRG-SMING . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Security Considerations . . . . . . . . . . . . . . . . . . . 11 4. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11 References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 12 Intellectual Property and Copyright Statements . . . . . . . . 13 Strauss & Schoenwaelder Expires November 27, 2003 [Page 2] Internet-Draft SMIng Modules May 2003 1. Introduction Most SMIng [SMIng] modules are built on top of some core definitions of commonly used data types. These core type definitions are contained in the NMRG-SMING modules which is contained in this memo. Its data types are generally applicable for modelling all areas of management information. Among these types are counter types, string types and date and time related types. This module is derived from RFC 2578 [RFC2578] and RFC 2579 [RFC2579]. 2. NMRG-SMING module NMRG-SMING { organization "IRTF Network Management Research Group (NMRG)"; contact "Frank Strauss TU Braunschweig Muehlenpfordtstrasse 23 38106 Braunschweig Germany Phone: +49 531 391-3266 EMail: strauss@ibr.cs.tu-bs.de"; description "Core type definitions for SMIng. Several type definitions are SMIng versions of similar SMIv2 or SPPI definitions."; revision { date "2003-05-07"; description "Initial revision, published as RFC XXXX."; }; typedef Gauge32 { type Unsigned32; description "The Gauge32 type represents a non-negative integer, which may increase or decrease, but shall never exceed a maximum value, nor fall below a minimum value. The maximum value can not be greater than 2^32-1 (4294967295 decimal), and the minimum value can not be smaller than 0. The value of a Gauge32 has its maximum value whenever the information being modeled is greater than or equal to its Strauss & Schoenwaelder Expires November 27, 2003 [Page 3] Internet-Draft SMIng Modules May 2003 maximum value, and has its minimum value whenever the information being modeled is smaller than or equal to its minimum value. If the information being modeled subsequently decreases below (increases above) the maximum (minimum) value, the Gauge32 also decreases (increases). (Note that despite of the use of the term `latched' in the original definition of this type, it does not become `stuck' at its maximum or minimum value.)"; reference "RFC 2578, Sections 2. and 7.1.7."; }; typedef Counter32 { type Unsigned32; description "The Counter32 type represents a non-negative integer which monotonically increases until it reaches a maximum value of 2^32-1 (4294967295 decimal), when it wraps around and starts increasing again from zero. Counters have no defined `initial' value, and thus, a single value of a Counter has (in general) no information content. Discontinuities in the monotonically increasing value normally occur at re-initialization of the management system, and at other times as specified in the description of an attribute using this type. If such other times can occur, for example, the creation of a class instance that contains an attribute of type Counter32 at times other than re-initialization, then a corresponding attribute should be defined, with an appropriate type, to indicate the last discontinuity. Examples of appropriate types include: TimeStamp, DateAndTime or TimeTicks (other types defined in this module). The value of the access statement for attributes with a type value of Counter32 should be either `readonly' or `eventonly'. A default statement should not be used for attributes with a type value of Counter32."; reference "RFC 2578, Sections 2. and 7.1.6."; }; typedef Gauge64 { Strauss & Schoenwaelder Expires November 27, 2003 [Page 4] Internet-Draft SMIng Modules May 2003 type Unsigned64; description "The Gauge64 type represents a non-negative integer, which may increase or decrease, but shall never exceed a maximum value, nor fall below a minimum value. The maximum value can not be greater than 2^64-1 (18446744073709551615), and the minimum value can not be smaller than 0. The value of a Gauge64 has its maximum value whenever the information being modeled is greater than or equal to its maximum value, and has its minimum value whenever the information being modeled is smaller than or equal to its minimum value. If the information being modeled subsequently decreases below (increases above) the maximum (minimum) value, the Gauge64 also decreases (increases). (Note that despite of the use of the term `latched' in the original definition of this type, it does not become `stuck' at its maximum or minimum value.)"; }; typedef Counter64 { type Unsigned64; description "The Counter64 type represents a non-negative integer which monotonically increases until it reaches a maximum value of 2^64-1 (18446744073709551615), when it wraps around and starts increasing again from zero. Counters have no defined `initial' value, and thus, a single value of a Counter has (in general) no information content. Discontinuities in the monotonically increasing value normally occur at re-initialization of the management system, and at other times as specified in the description of an attribute using this type. If such other times can occur, for example, the creation of a class instance that contains an attribute of type Counter32 at times other than re-initialization, then a corresponding attribute should be defined, with an appropriate type, to indicate the last discontinuity. Examples of appropriate types include: TimeStamp, DateAndTime or TimeTicks (other types defined in this module). The value of the access statement for attributes with a type value of Counter64 should be either `readonly' or `eventonly'. Strauss & Schoenwaelder Expires November 27, 2003 [Page 5] Internet-Draft SMIng Modules May 2003 A default statement should not be used for attributes with a type value of Counter64."; reference "RFC 2578, Sections 2. and 7.1.10."; }; typedef Opaque { type OctetString; status obsolete; description "******* THIS TYPE DEFINITION IS OBSOLETE ******* The Opaque type is provided solely for backward-compatibility, and shall not be used for newly-defined attributes and derived types. The Opaque type supports the capability to pass arbitrary ASN.1 syntax. A value is encoded using the ASN.1 Basic Encoding Rules into a string of octets. This, in turn, is encoded as an OctetString, in effect `double-wrapping' the original ASN.1 value. Note that a conforming implementation need only be able to accept and recognize opaquely-encoded data. It need not be able to unwrap the data and then interpret its contents. A requirement on `standard' modules is that no attribute may have a type value of Opaque and no type may be derived from the Opaque type."; reference "RFC 2578, Sections 2. and 7.1.9."; }; typedef IpAddress { type OctetString (4); status deprecated; description "******* THIS TYPE DEFINITION IS DEPRECATED ******* The IpAddress type represents a 32-bit internet IPv4 address. It is represented as an OctetString of length 4, in network byte-order. Note that the IpAddress type is present for historical reasons."; reference Strauss & Schoenwaelder Expires November 27, 2003 [Page 6] Internet-Draft SMIng Modules May 2003 "RFC 2578, Sections 2. and 7.1.5."; }; typedef TimeTicks { type Unsigned32; description "The TimeTicks type represents a non-negative integer which represents the time, modulo 2^32 (4294967296 decimal), in hundredths of a second between two epochs. When attributes are defined which use this type, the description of the attribute identifies both of the reference epochs. For example, the TimeStamp type (defined in this module) is based on the TimeTicks type."; reference "RFC 2578, Sections 2. and 7.1.8."; }; typedef TimeStamp { type TimeTicks; description "The value of the sysUpTime attribute at which a specific occurrence happened. The specific occurrence must be defined in the description of any attribute defined using this type. When the specific occurrence occurred prior to the last time sysUpTime was zero, then the TimeStamp value is zero. Note that this requires all TimeStamp values to be reset to zero when the value of sysUpTime reaches 497+ days and wraps around to zero."; reference "RFC 2579, Section 2."; }; typedef TimeInterval { type Integer32 (0..2147483647); description "A period of time, measured in units of 0.01 seconds. The TimeInterval type uses Integer32 rather than Unsigned32 for compatibility with RFC 2579."; reference "RFC 2579, Section 2."; }; typedef DateAndTime { type OctetString (8 | 11); default 0x0000000000000000000000; Strauss & Schoenwaelder Expires November 27, 2003 [Page 7] Internet-Draft SMIng Modules May 2003 format "2d-1d-1d,1d:1d:1d.1d,1a1d:1d"; description "A date-time specification. field octets contents range ----- ------ -------- ----- 1 1-2 year* 0..65535 2 3 month 1..12 3 4 day 1..31 4 5 hour 0..23 5 6 minutes 0..59 6 7 seconds 0..60 (use 60 for leap-second) 7 8 deci-seconds 0..9 8 9 direction from UTC '+' / '-' 9 10 hours from UTC* 0..13 10 11 minutes from UTC 0..59 * Notes: - the value of year is in big-endian encoding - daylight saving time in New Zealand is +13 For example, Tuesday May 26, 1992 at 1:30:15 PM EDT would be displayed as: 1992-5-26,13:30:15.0,-4:0 Note that if only local time is known, then timezone information (fields 8-10) is not present. The two special values of 8 or 11 zero bytes denote an unknown date-time specification."; reference "RFC 2579, Section 2."; }; typedef TruthValue { type Enumeration (true(1), false(2)); description "Represents a boolean value."; reference "RFC 2579, Section 2."; }; typedef PhysAddress { type OctetString; format "1x:"; description Strauss & Schoenwaelder Expires November 27, 2003 [Page 8] Internet-Draft SMIng Modules May 2003 "Represents media- or physical-level addresses."; reference "RFC 2579, Section 2."; }; typedef MacAddress { type OctetString (6); format "1x:"; description "Represents an IEEE 802 MAC address represented in the `canonical' order defined by IEEE 802.1a, i.e., as if it were transmitted least significant bit first, even though 802.5 (in contrast to other 802.x protocols) requires MAC addresses to be transmitted most significant bit first."; reference "RFC 2579, Section 2."; }; // The DisplayString definition below does not impose a size // restriction and is thus not the same as the DisplayString // definition in RFC 2579. The DisplayString255 definition is // provided for mapping purposes. typedef DisplayString { type OctetString; format "1a"; description "Represents textual information taken from the NVT ASCII character set, as defined in pages 4, 10-11 of RFC 854. To summarize RFC 854, the NVT ASCII repertoire specifies: - the use of character codes 0-127 (decimal) - the graphics characters (32-126) are interpreted as US ASCII - NUL, LF, CR, BEL, BS, HT, VT and FF have the special meanings specified in RFC 854 - the other 25 codes have no standard interpretation - the sequence 'CR LF' means newline - the sequence 'CR NUL' means carriage-return - an 'LF' not preceded by a 'CR' means moving to the same column on the next line. Strauss & Schoenwaelder Expires November 27, 2003 [Page 9] Internet-Draft SMIng Modules May 2003 - the sequence 'CR x' for any x other than LF or NUL is illegal. (Note that this also means that a string may end with either 'CR LF' or 'CR NUL', but not with CR.) "; }; typedef DisplayString255 { type DisplayString (0..255); description "A DisplayString with a maximum length of 255 characters. Any attribute defined using this syntax may not exceed 255 characters in length. The DisplayString255 type has the same semantics as the DisplayString textual convention defined in RFC 2579."; reference "RFC 2579, Section 2."; }; // The Utf8String and Utf8String255 definitions below facilitate // internationalization. The definition is consistent with the // definition of SnmpAdminString in RFC 2571. typedef Utf8String { type OctetString; format "65535t"; // is there a better way ? description "A human readable string represented using the ISO/IEC IS 10646-1 character set, encoded as an octet string using the UTF-8 transformation format described in RFC 2279. Since additional code points are added by amendments to the 10646 standard from time to time, implementations must be prepared to encounter any code point from 0x00000000 to 0x7fffffff. Byte sequences that do not correspond to the valid UTF-8 encoding of a code point or are outside this range are prohibited. The use of control codes should be avoided. When it is necessary to represent a newline, the control code sequence CR LF should be used. The use of leading or trailing white space should be avoided. For code points not directly supported by user interface hardware or software, an alternative means of entry and display, such as hexadecimal, may be provided. Strauss & Schoenwaelder Expires November 27, 2003 [Page 10] Internet-Draft SMIng Modules May 2003 For information encoded in 7-bit US-ASCII, the UTF-8 encoding is identical to the US-ASCII encoding. UTF-8 may require multiple bytes to represent a single character / code point; thus the length of a Utf8String in octets may be different from the number of characters encoded. Similarly, size constraints refer to the number of encoded octets, not the number of characters represented by an encoding. Note that the size of an Utf8String is measured in octets, not characters."; }; typedef Utf8String255 { type Utf8String (0..255); format "255t"; description "A Utf8String with a maximum length of 255 octets. Note that the size of an Utf8String is measured in octets, not characters."; }; identity null { description "An identity used to represent null pointer values."; }; }; 3. Security Considerations This module does not define any management objects. Instead, it defines a set of SMIng types which may be used by other SMIng modules to define management objects. These data definitions have no security impact on the Internet. 4. Acknowledgments Some definitions in this document are derived from RFC 2578 [RFC2578] and RFC 2579 [RFC2579], which were written by K. McCloghrie, D. Perkins, J. Schoenwaelder, J. Case, M. Rose, and S. Waldbusser. References Strauss & Schoenwaelder Expires November 27, 2003 [Page 11] Internet-Draft SMIng Modules May 2003 [SMIng] Strauss, F. and J. Schoenwaelder, "SMIng - Next Generation Structure of Management Information", draft-irtf-nmrg-sming-03.txt, May 2003. [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", RFC 2578, STD 59, April 1999. [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Textual Conventions for SMIv2", RFC 2579, STD 59, April 1999. Authors' Addresses Frank Strauss TU Braunschweig Muehlenpfordtstrasse 23 38106 Braunschweig Germany Phone: +49 531 391-3266 EMail: strauss@ibr.cs.tu-bs.de URI: http://www.ibr.cs.tu-bs.de/ Juergen Schoenwaelder International University Bremen P.O. Box 750 561 28725 Bremen Germany Phone: +49 421 200 3587 EMail: j.schoenwaelder@iu-bremen.de URI: http://www.iu-bremen.de/ Strauss & Schoenwaelder Expires November 27, 2003 [Page 12] Internet-Draft SMIng Modules May 2003 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. 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