Definitions of Managed Objects for Parallel-printer-like Hardware Devices
RFC 1318
Document | Type |
RFC - Proposed Standard
(April 1992; No errata)
Obsoleted by RFC 1660
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Author | Bob Stewart | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 1318 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group B. Stewart, Editor Request for Comments: 1318 Xyplex, Inc. April 1992 Definitions of Managed Objects for Parallel-printer-like Hardware Devices Status of this Memo This document specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited. 1. Abstract This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP based internets. In particular, it defines objects for the management of parallel-printer-like devices. 2. The Network Management Framework The Internet-standard Network Management Framework consists of three components. They are: RFC 1155 which defines the SMI, the mechanisms used for describing and naming objects for the purpose of management. RFC 1212 defines a more concise description mechanism, which is wholly consistent with the SMI. RFC 1156 which defines MIB-I, the core set of managed objects for the Internet suite of protocols. RFC 1213, defines MIB-II, an evolution of MIB-I based on implementation experience and new operational requirements. RFC 1157 which defines the SNMP, the protocol used for network access to managed objects. The Framework permits new objects to be defined for the purpose of experimentation and evaluation. 3. Objects Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Character MIB Working Group [Page 1] RFC 1318 PARALLEL-PRINTER-LIKE-MIB April 1992 Objects in the MIB are defined using the subset of Abstract Syntax Notation One (ASN.1) [7] defined in the SMI. In particular, each object has a name, a syntax, and an encoding. The name is an object identifier, an administratively assigned name, which specifies an object type. The object type together with an object instance serves to uniquely identify a specific instantiation of the object. For human convenience, we often use a textual string, termed the OBJECT DESCRIPTOR, to also refer to the object type. The syntax of an object type defines the abstract data structure corresponding to that object type. The ASN.1 language is used for this purpose. However, the SMI [3] purposely restricts the ASN.1 constructs which may be used. These restrictions are explicitly made for simplicity. The encoding of an object type is simply how that object type is represented using the object type's syntax. Implicitly tied to the notion of an object type's syntax and encoding is how the object type is represented when being transmitted on the network. The SMI specifies the use of the basic encoding rules of ASN.1 [8], subject to the additional requirements imposed by the SNMP. 3.1. Format of Definitions Section 5 contains the specification of all object types contained in this MIB module. The object types are defined using the conventions defined in the SMI, as amended by the extensions specified in [9,10]. 4. Overview The Parallel-printer-like Hardware Device MIB applies to interface ports that might logically support the Interface MIB, a Transmission MIB, or the Character MIB (most likely the latter). The most common example is a Centronics or Data Products type parallel printer port. The Parallel-printer-like MIB is one of a set of MIBs designed for complementary use. At this writing, the set comprises: Character MIB Working Group [Page 2] RFC 1318 PARALLEL-PRINTER-LIKE-MIB April 1992 Character MIB PPP MIB RS-232-like MIB Parallel-printer-like MIB The RS-232-like MIB and the Parallel-printer-like MIB represent the physical layer, providing service to higher layers such as the Character MIB or PPP MIB. Further MIBs may appear above these. The following diagram shows two possible "MIB stacks", each using the RS-232-like MIB. .-----------------. .-----------------. | Standard MIB | | Telnet MIB | | Interface Group | |-----------------| |-----------------| | Character MIB | | PPP MIB | |-----------------| |-----------------| | RS-232-like MIB | | RS-232-like MIB | `-----------------' `-----------------' The intent of the model is for the physical-level MIBs toShow full document text