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Keywords: PIB, Policy Information Base, SNMP, simple network management protocol, SPPI, Structure of Policy Provisioning Information, SMI, Structure of Management Information
Network Working Group K. McCloghrie
Request for Comments: 3159 M. Fine
Category: Standards Track Cisco Systems
J. Seligson
K. Chan
Nortel Networks
S. Hahn
R. Sahita
Intel
A. Smith
Allegro Networks
F. Reichmeyer
PFN
August 2001
Structure of Policy Provisioning Information (SPPI)
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This document, the Structure of Policy Provisioning Information
(SPPI), defines the adapted subset of SNMP's Structure of Management
Information (SMI) used to write Policy Information Base (PIB)
modules.
RFC 2748 defines the COPS protocol, and RFC 2749 describes how the
COPS protocol is used to provide for the outsourcing of policy
decisions for RSVP. Another usage of the COPS protocol, for the
provisioning of policy, is introduced in RFC 3084. In this
provisioning model, the policy information is viewed as a collection
of Provisioning Classes (PRCs) and Provisioning Instances (PRIs)
residing in a virtual information store, termed the Policy
Information Base (PIB). Collections of related Provisioning Classes
are defined in a PIB module.
McCloghrie, et al. Standards Track [Page 1]
RFC 3159 SPPI August 2001
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Table of Contents
1 Use of the SMI ................................................. 3
1.1 Terminology Translation ...................................... 3
1.2 Overview ..................................................... 3
2 Structure of this Specification ................................ 4
3 Definitions .................................................... 5
4 PIB Modules .................................................... 17
4.1 Importing Definitions ........................................ 17
4.2 Reserved Keywords ............................................ 18
5 Naming Hierarchy ............................................... 18
6 Mapping of the MODULE-IDENTITY macro ........................... 18
6.1 Mapping of the SUBJECT-CATEGORIES clause ..................... 18
7 Mapping of the OBJECT-TYPE macro ............................... 19
7.1 Mapping of the SYNTAX clause ................................. 19
7.1.1 Counter32 .................................................. 19
7.1.2 Gauge32 .................................................... 20
7.1.3 Opaque ..................................................... 20
7.1.4 IpAddress .................................................. 20
7.1.5 Counter64 .................................................. 20
7.1.6 Integer64 .................................................. 20
7.1.7 Unsigned64 ................................................. 20
7.1.8 Provisioning Classes ....................................... 21
7.2 Mapping of the MAX-ACCESS clause ............................. 21
7.3 Mapping of the PIB-ACCESS clause ............................. 22
7.4 Mapping of the INSTALL-ERRORS clause ......................... 22
7.5 Mapping of the PIB-INDEX clause .............................. 22
7.6 Mapping of the INDEX clause .................................. 23
7.7 Mapping of the AUGMENTS clause ............................... 23
7.8 Mapping of the EXTENDS clause ................................ 24
7.8.1 Relation between PIB-INDEX, AUGMENTS and EXTENDS clauses .. 24
7.9 Mapping of the UNIQUENESS clause ............................. 25
7.10 Mapping of the PIB-REFERENCES clause ........................ 25
7.11 Mapping of the PIB-TAG clause ............................... 25
8 Mapping of the OBJECT-IDENTITY macro ........................... 26
9 Mapping of the OBJECT-GROUP macro .............................. 26
9.1 Mapping of the OBJECTS clause ................................ 26
10 Mapping of the MODULE-COMPLIANCE macro ........................ 26
10.1 Mapping of the MODULE clause ................................ 26
10.1.1 Mapping of the MANDATORY-GROUPS clause .................... 27
10.1.2 Mapping of the GROUP clause ............................... 27
10.1.3 Mapping of the OBJECT clause .............................. 27
McCloghrie, et al. Standards Track [Page 2]
RFC 3159 SPPI August 2001
10.1.3.1 Mapping of the SYNTAX clause ............................ 27
10.1.3.2 Mapping of the WRITE-SYNTAX clause ...................... 28
10.1.3.3 Mapping of the PIB-MIN-ACCESS clause .................... 28
11 Textual Conventions ........................................... 28
11.1 Mapping of the TEXTUAL-CONVENTION macro ..................... 28
11.1.1 Mapping of the DISPLAY-HINT clause ........................ 29
11.1.2 Mapping of the SYNTAX clause .............................. 29
11.1.2.1 Sub-typing of Textual Conventions ....................... 29
12 Extending a PIB Module ........................................ 29
12.1 PIB Modules ................................................. 29
12.2 Object Assignments .......................................... 30
12.3 Object Definitions .......................................... 30
Appendix A: Mapping a PIB to a MIB ............................... 32
Appendix B: Example usage of PIB-REFERENCES and PIB-TAG clauses .. 33
Security Considerations .......................................... 35
IANA Considerations .............................................. 35
Authors' Addresses ............................................... 37
References ....................................................... 38
Full Copyright Statement ......................................... 40
1. Use of the SMI
The SPPI and PIB modules are based on SNMP's SMI and MIB modules,
which use an adapted subset of the ASN.1 data definition language
[ASN1]. The decision to base the definition of PIB modules on this
format allows for the leveraging of the community's knowledge,
experience and tools of the SMI and MIB modules.
1.1. Terminology Translation
The SMI uses the term "managed objects" to refer to object types,
both tabular types with descriptors such as xxxTable and xxxEntry, as
well as scalar and columnar object types. The SPPI does not use the
term "object" so as to avoid confusion with COPS protocol objects.
Instead, the SPPI uses the term Provisioning Class (PRC) for the
table and row definitions (the xxxTable and xxxEntry objects,
respectively), and Provisioning Instance (PRI) for an instantiation
of a row definition. For a columnar object of a table definition,
the SPPI uses the term "attribute" of a Provisioning Class. (The
SPPI does not support the equivalent of the SMI's scalar objects.)
1.2. Overview
SNMP's SMI is divided into five parts: module definitions, object
definitions, notification definitions [SMI], textual convention
definitions [TC] and conformance definitions [CONF].
McCloghrie, et al. Standards Track [Page 3]
RFC 3159 SPPI August 2001
- The SMI's MODULE-IDENTITY macro is used to convey the semantics of
a MIB module. The SPPI uses this macro to convey the semantics of
a PIB module.
- The SMI's OBJECT-TYPE macro is used to convey the syntax and
semantics of managed objects. The SPPI uses this macro to convey
the syntax and semantics of PRCs and their attributes.
- The SMI's notification definitions are not used (at this time) by
the SPPI. (Note that the use of the keyword 'notify' in the SPPI
is not related to the SMI's notifications).
- The SMI's TEXTUAL CONVENTION macro allows new data types to be
defined. The SPPI uses this macro to define new data types having
particular syntax and semantics which is common to several
attributes of one of more PRCs.
- The SMI's conformance definitions define several macros: the
OBJECT-GROUP macro, the NOTIFICATION-GROUP macro, the MODULE-
COMPLIANCE macro and the AGENT-CAPABILITIES macro. The SPPI uses
the OBJECT-GROUP and MODULE-COMPLIANCE macros to specify
acceptable lower-bounds of implementation of the attributes of
PRCs, and thereby indirectly, acceptable lower-bounds of
implementation of the PRCs themselves. The NOTIFICATION-GROUP
macro is not used (at this time) by the SPPI. Potential usage by
the SPPI of the AGENT- CAPABILITIES macro is for further study.
2. Structure of this Specification
The SMI is specified in terms of an ASN.1 definition together with
descriptive text for each element introduced in that ASN.1
definition. This document specifies the SPPI also via a ASN.1
definition, which is a modified version of the SMI's definition,
together with descriptive text for only those elements in the SPPI's
ASN.1 definition which have differences from the SMI's. For elements
in the ASN.1 definition which have no descriptive text in this
specification, the reader is referred to the SMI's descriptive text
for that element.
McCloghrie, et al. Standards Track [Page 4]
RFC 3159 SPPI August 2001
3. Definitions
COPS-PR-SPPI DEFINITIONS ::= BEGIN
IMPORTS ObjectName, SimpleSyntax, ExtUTCTime, mgmt
FROM SNMPv2-SMI;
-- the root for PIB definitions
pib OBJECT IDENTIFIER ::= { mgmt 2 }
-- definitions for PIB modules
MODULE-IDENTITY MACRO ::=
BEGIN
TYPE NOTATION ::=
SubjectPart -- new
"LAST-UPDATED" value(Update ExtUTCTime)
"ORGANIZATION" Text
"CONTACT-INFO" Text
"DESCRIPTION" Text
RevisionPart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
SubjectPart ::= -- new
"SUBJECT-CATEGORIES" "{" Categories "}"
-- see IANA Considerations section
Categories ::= -- new
CategoryIDs
| "all"
CategoryIDs ::= -- new
CategoryID
| CategoryIDs "," CategoryID
CategoryID ::= -- new
identifier "(" number ")" -- number is positive
RevisionPart ::=
Revisions
| empty
Revisions ::=
Revision
| Revisions Revision
Revision ::=
"REVISION" value(Update ExtUTCTime)
"DESCRIPTION" Text
McCloghrie, et al. Standards Track [Page 5]
RFC 3159 SPPI August 2001
-- a character string as defined in [SMI]
Text ::= value(IA5String)
END
--
OBJECT-IDENTITY MACRO ::=
BEGIN
TYPE NOTATION ::=
"STATUS" Status
"DESCRIPTION" Text
ReferPart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
Status ::=
"current"
| "deprecated"
| "obsolete"
ReferPart ::=
"REFERENCE" Text
| empty
-- a character string as defined in [SMI]
Text ::= value(IA5String)
END
-- syntax of attributes
-- the "base types" defined here are:
-- 3 built-in ASN.1 types: INTEGER, OCTET STRING, OBJECT IDENTIFIER
-- 7 application-defined types: Integer32, IpAddress, Unsigned32,
-- TimeTicks, Opaque, Integer64 and Unsigned64
ObjectSyntax ::=
CHOICE {
simple
SimpleSyntax,
-- note that SEQUENCEs for table and row definitions
-- are not mentioned here...
application-wide
ApplicationSyntax
}
McCloghrie, et al. Standards Track [Page 6]
RFC 3159 SPPI August 2001
-- application-wide types
ApplicationSyntax ::=
CHOICE {
ipAddress-value
IpAddress,
timeticks-value
TimeTicks,
arbitrary-value
Opaque,
unsigned-integer-value
Unsigned32,
large-integer-value -- new
Integer64,
large-unsigned-integer-value -- new
Unsigned64
}
-- the following 5 types are copied from the SMI
-- indistinguishable from INTEGER, but never needs more than
-- 32-bits for a two's complement representation
Integer32 ::=
INTEGER (-2147483648..2147483647)
-- (this is a tagged type for historical reasons)
IpAddress ::=
[APPLICATION 0]
IMPLICIT OCTET STRING (SIZE (4))
-- ******* 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. IPv4 and IPv6 addresses should
-- be represented using the INET-ADDRESS-MIB
-- defined in [INETADDR].
-- an unsigned 32-bit quantity
Unsigned32 ::=
[APPLICATION 2]
IMPLICIT INTEGER (0..4294967295)
McCloghrie, et al. Standards Track [Page 7]
RFC 3159 SPPI August 2001
-- hundredths of seconds since an epoch
TimeTicks ::=
[APPLICATION 3]
IMPLICIT INTEGER (0..4294967295)
--for backward compatibility only
Opaque ::=
[APPLICATION 4]
IMPLICIT OCTET STRING
-- the following 2 types are not present in the SMI
Integer64 ::=
[APPLICATION 10]
IMPLICIT INTEGER (-9223372036854775808..9223372036854775807)
Unsigned64 ::=
[APPLICATION 11]
IMPLICIT INTEGER (0..18446744073709551615)
-- definition for Provisioning Classes and their attributes
-- (differences from the SMI are noted in the ASN.1 comments)
OBJECT-TYPE MACRO ::=
BEGIN
TYPE NOTATION ::=
"SYNTAX" Syntax
UnitsPart
"PIB-ACCESS" Access -- modified
PibReferencesPart -- new
PibTagPart -- new
"STATUS" Status
"DESCRIPTION" Text
ErrorsPart -- new
ReferPart
IndexPart -- modified
MibIndexPart -- modified
UniquePart -- new
DefValPart
VALUE NOTATION ::=
value(VALUE ObjectName)
Syntax ::= -- Must be one of the following:
-- a base type (or its refinement),
-- a textual convention (or its refinement), or
-- a BITS pseudo-type
McCloghrie, et al. Standards Track [Page 8]
RFC 3159 SPPI August 2001
type
| "BITS" "{" NamedBits "}"
NamedBits ::= NamedBit
| NamedBits "," NamedBit
NamedBit ::= identifier "(" number ")" -- number is nonnegative
UnitsPart ::=
"UNITS" Text
| empty
Access ::= -- modified
"install"
| "notify"
| "install-notify"
| "report-only"
Status ::=
"current"
| "deprecated"
| "obsolete"
ErrorsPart ::= -- new
"INSTALL-ERRORS" "{" Errors "}"
| empty
Errors ::= -- new
Error
| Errors "," Error
Error ::= -- new
identifier "(" number ")" -- number is positive
ReferPart ::=
"REFERENCE" Text
| empty
IndexPart ::=
"PIB-INDEX" "{" Index "}" -- new
| "AUGMENTS" "{" Entry "}"
| "EXTENDS" "{" Entry "}" -- new
| empty
Index ::=
-- the correspondent OBJECT-TYPE invocation
value(ObjectName)
Entry ::=
-- use the INDEX value of the
-- correspondent OBJECT-TYPE invocation
McCloghrie, et al. Standards Track [Page 9]
RFC 3159 SPPI August 2001
value(ObjectName)
MibIndexPart ::=
"INDEX" "{" IndexTypePart "}"
| empty
IndexTypePart ::=
IndexTypes
| IndexTypes "," ImpliedIndex
| ImpliedIndex
IndexTypes ::=
Index
| IndexTypes "," Index
ImpliedIndex ::=
"IMPLIED" Index
PibReferencesPart ::=
-- for use with ReferenceId TC
"PIB-REFERENCES" "{" Entry "}"
| empty
PibTagPart ::=
-- for use with TagReferenceId TC
"PIB-TAG" "{" Attr "}"
| empty
Attr ::= -- specifies an attribute
value(ObjectName)
UniquePart ::= -- new
"UNIQUENESS" "{" UniqueTypes "}"
| "UNIQUENESS" "{" "}"
| empty
UniqueTypes ::=
UniqueType
| UniqueTypes "," UniqueType
UniqueType ::=
-- the correspondent OBJECT-TYPE invocation
value(ObjectName)
DefValPart ::= "DEFVAL" "{" Defvalue "}"
| empty
Defvalue ::= -- must be valid for the type specified in
-- SYNTAX clause of same OBJECT-TYPE macro
value(ObjectSyntax)
| "{" BitsValue "}"
BitsValue ::= BitNames
McCloghrie, et al. Standards Track [Page 10]
RFC 3159 SPPI August 2001
| empty
BitNames ::= BitName
| BitNames "," BitName
BitName ::= identifier
-- a character string as defined in [SMI]
Text ::= value(IA5String)
END
-- definitions for conformance groups
OBJECT-GROUP MACRO ::=
BEGIN
TYPE NOTATION ::=
ObjectsPart
"STATUS" Status
"DESCRIPTION" Text
ReferPart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
ObjectsPart ::=
"OBJECTS" "{" Objects "}"
Objects ::=
Object
| Objects "," Object
Object ::=
value(ObjectName)
Status ::=
"current"
| "deprecated"
| "obsolete"
ReferPart ::=
"REFERENCE" Text
| empty
-- a character string as defined in [SMI]
Text ::= value(IA5String)
END
-- definitions for compliance statements
McCloghrie, et al. Standards Track [Page 11]
RFC 3159 SPPI August 2001
MODULE-COMPLIANCE MACRO ::=
BEGIN
TYPE NOTATION ::=
"STATUS" Status
"DESCRIPTION" Text
ReferPart
ModulePart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
Status ::=
"current"
| "deprecated"
| "obsolete"
ReferPart ::=
"REFERENCE" Text
| empty
ModulePart ::=
Modules
Modules ::=
Module
| Modules Module
Module ::=
-- name of module --
"MODULE" ModuleName
MandatoryPart
CompliancePart
ModuleName ::=
-- identifier must start with uppercase letter
identifier ModuleIdentifier
-- must not be empty unless contained
-- in MIB Module
| empty
ModuleIdentifier ::=
value(OBJECT IDENTIFIER)
| empty
MandatoryPart ::=
"MANDATORY-GROUPS" "{" Groups "}"
| empty
Groups ::=
Group
| Groups "," Group
McCloghrie, et al. Standards Track [Page 12]
RFC 3159 SPPI August 2001
Group ::=
value(OBJECT IDENTIFIER)
CompliancePart ::=
Compliances
| empty
Compliances ::=
Compliance
| Compliances Compliance
Compliance ::=
ComplianceGroup
| Object
ComplianceGroup ::=
"GROUP" value(OBJECT IDENTIFIER)
"DESCRIPTION" Text
Object ::=
"OBJECT" value(ObjectName)
InstallSyntaxPart -- modified
AccessPart
"DESCRIPTION" Text
-- must be a refinement for object's SYNTAX clause
InstallSyntaxPart ::= "SYNTAX" Syntax
| empty
Syntax ::= -- Must be one of the following:
-- a base type (or its refinement),
-- a textual convention (or its refinement), or
-- a BITS pseudo-type
type
| "BITS" "{" NamedBits "}"
NamedBits ::= NamedBit
| NamedBits "," NamedBit
NamedBit ::= identifier "(" number ")" -- number is nonnegative
AccessPart ::=
"PIB-MIN-ACCESS" Access -- modified
| empty
Access ::= -- modified
"not-accessible"
| "install"
| "notify"
| "install-notify"
McCloghrie, et al. Standards Track [Page 13]
RFC 3159 SPPI August 2001
| "report-only"
-- a character string as defined in [SMI]
Text ::= value(IA5String)
END
-- definition of textual conventions
TEXTUAL-CONVENTION MACRO ::=
BEGIN
TYPE NOTATION ::=
DisplayPart
"STATUS" Status
"DESCRIPTION" Text
ReferPart
"SYNTAX" Syntax
VALUE NOTATION ::=
value(VALUE Syntax) -- adapted ASN.1
DisplayPart ::=
"DISPLAY-HINT" Text
| empty
Status ::=
"current"
| "deprecated"
| "obsolete"
ReferPart ::=
"REFERENCE" Text
| empty
-- a character string as defined in [SMI]
Text ::= value(IA5String)
Syntax ::= -- Must be one of the following:
-- a base type (or its refinement), or
-- a BITS pseudo-type
type
| "BITS" "{" NamedBits "}"
NamedBits ::= NamedBit
| NamedBits "," NamedBit
NamedBit ::= identifier "(" number ")" -- number is nonnegative
END
McCloghrie, et al. Standards Track [Page 14]
RFC 3159 SPPI August 2001
END
COPS-PR-SPPI-TC PIB-DEFINITIONS ::= BEGIN
IMPORTS Unsigned32, MODULE-IDENTITY, TEXTUAL-CONVENTION, pib
FROM COPS-PR-SPPI;
copsPrSppiTc MODULE-IDENTITY
SUBJECT-CATEGORIES { all }
LAST-UPDATED "200108160000Z"
ORGANIZATION "IETF RAP WG"
CONTACT-INFO "Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive,
San Jose, CA 95134-1706 USA
Phone: +1 408 526 5260
Email: kzm@cisco.com
Ravi Sahita
Intel
2111 NE 25th Avenue
Hillsboro, OR 97124 USA
Phone: +1 503 712 1554
Email: ravi.sahita@intel.com "
DESCRIPTION
"The PIB module containing a set of Textual Conventions
which have general applicability to all PIB modules."
REVISION "200108160000Z"
DESCRIPTION
"Initial version, published in RFC 3159."
::= { pib 1 }
InstanceId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"The textual convention for use by an attribute which is used
as the instance-identifying index of a PRC, i.e., an attribute
named in a PIB-INDEX clause. The value of an attribute with
this syntax is always greater than zero. PRIs of the same PRC
need not have contiguous values for their instance-identifying
attribute."
SYNTAX Unsigned32 (1..4294967295)
ReferenceId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A textual convention for use by an attribute which is used as
a pointer in order to reference an instance of a particular
McCloghrie, et al. Standards Track [Page 15]
RFC 3159 SPPI August 2001
PRC. An attribute with this syntax must not be used in a
PIB-INDEX clause , and its description must specify the
particular PRC to which the referenced PRI will belong.
For an attribute of this type, the referenced PRI must exist.
Furthermore, it is an error to try to delete a PRI that is
referenced by another instance without first deleting/modifying
the referencing instance. The definition of an attribute with
this syntax can permit the attribute to have a value of zero to
indicate that it is not currently pointing to a PRI."
SYNTAX Unsigned32
Prid ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Represents a pointer to a PRI, i.e,. to an instance of a
PRC. The value is the OID name of the PRC's row definition,
appended with one sub-identifier containing the value of the
InstanceId value for the referenced instance. The definition
of an attribute with this syntax can permit the attribute to
have a value of 0.0 to indicate that it is not currently
pointing to a PRI."
SYNTAX OBJECT IDENTIFIER
TagId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Represents a tag value, such that all instances of a
particular PRC having the same tag value form a tag list.
A tag list is identified by the tag value shared by all
instances in that tag list."
SYNTAX Unsigned32 (1..4294967295)
TagReferenceId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Represents a reference to a tag list of instances of a
particular PRC. The particular PRC must have an attribute
with the syntax of TagId. The tag list consists of
all instances which have the same value of the TagId
attribute. Reference to the tag list is via the attribute
with the syntax of TagReferenceId containing the tag
value which identifies the tag list.
The definition of an attribute with this syntax can permit
the attribute to have a value of 0 to indicate that it is
not currently referencing a tag list."
SYNTAX Unsigned32
END
McCloghrie, et al. Standards Track [Page 16]
RFC 3159 SPPI August 2001
4. PIB Modules
The names of all standard PIB modules must be unique (but different
versions of the same module should have the same name). Developers
of enterprise PIB modules are encouraged to choose names for their
modules that will have a low probability of colliding with standard
or other enterprise modules.
The first line of a PIB module is:
PIB-MODULE-NAME PIB-DEFINITIONS ::= BEGIN
where PIB-MODULE-NAME is the module name.
Like the SMI, additional ASN.1 macros must not be defined in PIB
modules.
4.1. Importing Definitions
Like the SMI, a PIB module which needs to reference an external
definition, must use the IMPORTS statement to identify both the
descriptor and the module in which the descriptor is defined, where a
module is identified by its ASN.1 module name.
In particular, a PIB module imports each of the base data types that
it uses from COPS-PR-SPPI (defined in this document), and may import
as required from other PIB modules. A PIB module may import, from
the SMI, (subtree) OIDs for the purpose of defining new OIDs. A PIB
module may also import, from MIB modules, OID assignments as well as
textual convention definitions providing that their underlying syntax
is supported by the SPPI. However, the following must not be
included in an IMPORTS statement:
- named types defined by ASN.1 itself, specifically: INTEGER, OCTET
STRING, OBJECT IDENTIFIER, SEQUENCE, SEQUENCE OF type,
- the BITS construct.
For each ASN.1 macro that a PIB uses, it must import that macro's
definition from the COPS-PR-SPPI.
McCloghrie, et al. Standards Track [Page 17]
RFC 3159 SPPI August 2001
4.2. Reserved Keywords
In addition to the reserved keywords listed in the SMI, the following
must not be used as descriptors or module names:
EXTENDS INSTALL-ERRORS Integer64 PIB-MIN-ACCESS PIB-ACCESS PIB-
INDEX PIB-REFERENCES PIB-TAG SUBJECT-CATEGORIES UNIQUENESS
Unsigned64
5. Naming Hierarchy
The SPPI uses the same OBJECT IDENTIFIER naming hierarchy as the SMI.
That is, OIDs are typically assigned to PIB modules from the subtree
administered by the Internet Assigned Numbers Authority (IANA).
However, like the SMI, the SPPI does not prohibit the definition of
PRCs in other portions of the OID tree.
6. Mapping of the MODULE-IDENTITY macro
6.1. Mapping of the SUBJECT-CATEGORIES clause
The SUBJECT-CATEGORIES clause, which must be present, identifies one
or more categories of provisioning data for which this PIB module
defines provisioning information. For use with the COPS-PR protocol,
the individual subject categories are mapped to COPS Client Types
[COPS-PR]. IANA Considerations for SPPI SUBJECT-CATEGORIES follow
the same requirements as specified in [COPS] IANA Considerations for
COPS Client Types. The subject categories are identified either:
- via the keyword "all", indicating the PIB module defines
provisioning information relevant for all subject categories (and
thus, all COPS Client Types), or
- a list of named-number enumerations, where each number which must
be greater than zero, identifies a subject category, and is mapped
to the Client Type which is identified by that same number in the
COPS protocol. The namespace for these named numbers is global
and therefore the labels should be assigned consistently across
PIB modules. At present time, no more than one named-number
enumeration should be specified.
Note that the list of categories specified in a PIB module's SUBJECT-
CATEGORIES clause is not exclusive. That is, some other
specification might (e.g., at a future date) specify additional COPS
Client Types to which the module is relevant.
McCloghrie, et al. Standards Track [Page 18]
RFC 3159 SPPI August 2001
When a PIB module applies to multiple subject categories, that PIB
module exists in multiple virtual information stores, one for each
Client-Type. A PIB module with SUBJECT-CATEGORIES "all" uses the
named- number specified in the SUBJECT-CATEGORIES of the PIB it is
associated with, as the COPS Client-Type when it is sent over COPS.
7. Mapping of the OBJECT-TYPE macro
The SPPI requires that all attribute definitions be contained within
a PRC, i.e., within a table definition.
7.1. Mapping of the SYNTAX clause
The SYNTAX clause, which must be present within the definition of an
attribute, defines the abstract data structure of that attribute.
The data structure must be one of the following: a base type, the
BITS construct, or a textual convention.
The SYNTAX clause must also be present for the table and row
definitions of a PRC, and in this case must be a SEQUENCE OF or
SEQUENCE (see section 8.1.7 below).
The base types are an extended subset of the SMI's base types:
- built-in ASN.1 types: INTEGER, OCTET STRING, OBJECT IDENTIFIER,
- application-defined types: Integer32, Unsigned32, TimeTicks,
Integer64 and Unsigned64.
A textual convention is a newly-defined type defined as a sub-type of
a base type [TC]. The value of an attribute whose syntax is defined
using a textual convention is encoded "on-the-wire" according to the
textual convention's underlying base type.
Note that the set of base types has been chosen so as to provide
sufficient variety of on-the-wire encodings for attribute values;
base types should contain a minimum of semantics. Semantics should,
to the extent possible, be incorporated into a data type through the
use of a textual convention.
The differences from the SMI in the semantics of ObjectSyntax are now
described.
7.1.1. Counter32
The Counter32 type is not supported by the SPPI.
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7.1.2. Gauge32
The Gauge32 type is not supported by the SPPI.
7.1.3. Opaque
The Opaque type is provided solely for backward-compatibility, and
shall not be used for newly-defined object types. The Opaque type
supports the capability to pass arbitrary ASN.1 syntax. A value is
encoded using the ASN.1 Basic Encoding Rules [ASN1] into a string of
octets. This, in turn, is encoded as an OCTET STRING, 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" PIB modules is
that no object may have a SYNTAX clause value of Opaque.
7.1.4. IpAddress
The IpAddress type is provided solely for backward-compatibility, and
shall not be used for newly-defined object types. Instead, It is
recommended to use the InetAddressType/InetAddress pair TCs as
defined in RFC2851 [INETADDR].
7.1.5. Counter64
The Counter64 type is not supported by the SPPI.
7.1.6. Integer64
The Integer64 type represents integer-valued information between
-2^63 and 2^63-1 inclusive (-9223372036854775808 to
9223372036854775807 decimal). While Integer64 may be sub-typed to be
more constrained, if the constraint results in all possible values
being contained in the range (-2147483648..2147483647), then the
Integer32 type must be used instead of Integer64.
7.1.7. Unsigned64
The Unsigned64 type represents integer-valued information between 0
and 2^64-1 inclusive (0 to 18446744073709551615 decimal). While
Unsigned64 may be sub-typed to be more constrained, if the constraint
results in all possible values being contained in the range
(0..4294967295), then the Unsigned32 type must be used instead of
Unsigned64.
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7.1.8. Provisioning Classes
The operations (on PIBs) supported by the SPPI apply exclusively to
PRCs. Each PRC is modelled as a tabular structure, i.e., a table.
Each instance of a particular PRC has the same set of attributes.
The set of attributes which belong to every instance of a particular
PRC is modelled as a row in the table. Note that a PRC must have no
more than 127 attributes. The usage of subids (for PRC attributes)
beyond 127 (that is 128 and above) is reserved for Mapping PIBs to
MIBs (see Appendix A). PRCs that require more than 127 attributes
must use the AUGMENTS clause to augment the PRC containing the
initial 127 attributes to add additional attributes. Definition of
Provisioning Classes is formalized by using the OBJECT-TYPE macro to
define both:
- the PRC as a whole, called the table definition, and
- the characteristics of every instance of a particular PRC, called
the row definition.
In the table definition, the SYNTAX clause has the form:
SEQUENCE OF <EntryType>
where <EntryType> refers to the SEQUENCE type of its attribute
definitions. In the row definition, the SYNTAX clause has the form:
<EntryType>
where <EntryType> is a SEQUENCE type defined as follows:
<EntryType> ::= SEQUENCE { <type1>, ... , <typeN> }
where there is one <type> for each attribute, and each <type> is of
the form:
<descriptor> <syntax>
where <descriptor> is the descriptor naming an attribute, and
<syntax> has the value of that attribute's SYNTAX clause, except that
both sub- typing information and the named values for enumerated
integers or the named bits for the BITS construct, are omitted from
<syntax>.
7.2. Mapping of the MAX-ACCESS clause
The MAX-ACCESS clause is not supported by the SPPI.
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7.3. Mapping of the PIB-ACCESS clause
The PIB-ACCESS clause must be present for a PRC's table definition,
and must not be present for any other OBJECT-TYPE definition. The
PIB-ACCESS clause defines what kind of access is appropriate for the
PRC.
- the value "install" is used to indicate a PRC which a PDP can
install in the PEP as provisioning information.
- the value "notify" is used to indicate a PRC for which the PEP
must notify the PDP of all its instances and attribute values of
that PRC.
- the value "install-notify" is used to indicate the uncommon type
of PRC which has both characteristics: "install" and "notify".
- the value "report-only" is used to indicate a PRC which has
neither the "install" characteristic nor the "notify"
characteristic. However, instances of such a PRC may be included
in synchronous/asynchronous reports generated by the PEP. (Note:
PRCs having the "install" and/or "notify" characteristics may also
be included in reports generated by the PEP.)
7.4. Mapping of the INSTALL-ERRORS clause
The INSTALL-ERRORS clause, which may optionally be present for a
PRC's table definition, and must be absent otherwise, lists one or
more potential reasons for rejecting an install or a removal of an
instance of the PRC. Each reason consists of a named-number
enumeration, where the number represents a PRC-specific error-code to
be used in a COPS protocol message, as the Error Sub-code, with the
Error-Code set to priSpecificError (see [COPS-PR]). The semantics of
each named-number enumeration should be described in the PRC's
DESCRIPTION clause.
The numbers listed in an INSTALL-ERRORS must be greater than zero and
less than 65536. If this clause is not present, an install/remove
can still fail, but no PRC-specific error is available to be
reported.
7.5. Mapping of the PIB-INDEX clause
The PIB-INDEX clause, which must be present for a row definition
(unless an AUGMENTS or an EXTENDS clause is present instead), and
must be absent otherwise, defines identification information for
instances of the PRC.
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The PIB-INDEX clause includes exactly one descriptor. This
descriptor specifies an attribute (typically, but not necessarily of
the same PRC) which is used to identify an instance of that PRC. The
syntax of this attribute is REQUIRED to be InstanceId (a textual
convention with an underlying syntax of Unsigned32), and it has no
semantics other than its use in identifying the PRC instance. The
OBJECT IDENTIFIER which identifies an instance of a PRC is formed by
appending one sub- identifier to the OID which identifies that PRC's
row definition. The value of the additional sub-identifier is that
instance's value of the attribute specified in the INDEX clause.
Note that SPPI does not permit use of the IMPLIED keyword in a PIB-
INDEX clause.
7.6. Mapping of the INDEX clause
The INDEX clause is optionally present if a PIB-INDEX clause is
present, and must be absent otherwise. If present, the INDEX clause
can contain any number of attributes, and is used only by the
algorithmic conversion of a PIB to a MIB (see Appendix A).
An IMPLIED keyword can be present in an INDEX clause if so desired.
7.7. Mapping of the AUGMENTS clause
The AUGMENTS clause, which must not be present except in row
definitions, is an alternative to the PIB-INDEX clause and the
EXTENDS clause. Every row definition has exactly one of: a PIB-INDEX
clause, an AUGMENTS clause, or an EXTENDS clause.
A row definition which has a PIB-INDEX clause is called a base row
definition. A row definition which has an AUGMENTS clause is called
a row augmentation, where the AUGMENTS clause names the base row
definition which is augmented by this row augmentation. (Thus, a row
augmentation cannot itself be augmented.)
A PRC whose row definition is a row augmentation is called an
augmenting PRC. Instances of an augmenting PRC are identified
according to the PIB-INDEX clause of the base row definition named in
the AUGMENTS clause. Further, instances of an augmenting PRC exist
according to the same semantics as instances of the PRC which it
augments. As such, when an instance of a PRC is installed or removed,
an instance of every PRC which augments it is also installed or
removed. (for more details, see [COPS-PR]).
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7.8. Mapping of the EXTENDS clause
The EXTENDS clause, which must not be present except in row
definitions, is an alternative to the PIB-INDEX clause and the
AUGMENTS clause. Every row definition has exactly one of: a PIB-
INDEX clause, an AUGMENTS clause, or an EXTENDS clause.
A row definition which has an EXTENDS clause is called a sparse row
augmentation, where the EXTENDS clause names the row definition which
is sparsely-augmented by this sparse row augmentation. The sparsely-
augmented row can be a base row definition, or another sparse row
augmentation.
A PRC whose row definition is a sparse row augmentation is called a
sparsely augmenting PRC. Instances of a sparsely augmenting PRC are
identified according to the PIB-INDEX clause of the row definition
named in the sparsely augmenting PRC's EXTENDS clause.
An instance of a sparsely augmenting PRC can not exist unless a
corresponding instance of the PRC which it sparsely augments exists.
As such, when an instance of a PRC is removed, an instance of any PRC
which sparsely augments it is also removed. However, an instance of
a sparsely augmenting PRC need not exist when the corresponding
instance of the PRC that it sparsely augments exists. Thus, an
instance of a sparsely augmenting PRC can be installed at the same
time as or subsequent to the installation of, and can be removed
prior to the removal of, the corresponding instance of the PRC that
it sparsely augments. So, instances of a sparsely augmenting PRC
must be installed explicitly, but are removed either implicitly (via
removal of the augmented PRI) or explicitly. When a sparsely
augmented PRC is installed, both instances, the instance of the
sparsely augmented PRC and the instance of the sparsely augmenting
PRC must be sent in one COPS message.
7.8.1. Relation between PIB-INDEX, AUGMENTS and EXTENDS clauses
When defining instance identification information for a PRC:
- If there is a one-to-one correspondence between instances of this
PRC and instances of an existing PRC, then the AUGMENTS clause
should be used.
- Otherwise, if there is a sparse relationship between instances of
this PRC and instances of an existing PRC (that is, there is a one
to zero or one correspondence between instances of a sparsely
augmented PRC and the instances of the PRC that sparsely augments
it.), then an EXTENDS clause should be used.
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- Otherwise, a PIB-INDEX clause should be used which names its own
InstanceId attribute.
7.9. Mapping of the UNIQUENESS clause
The UNIQUENESS clause, which is optionally present for any row
definition, lists a set of zero or more of the PRC's attributes, for
which no two instances of the PRC can have the same set of values.
The specified set of attributes provide a necessary and sufficient
set of values by which to identify an instance of this PRC. The
attribute contained in the PIB-INDEX clause may not be present in the
UNIQUENESS clause. By definition, an attribute may not appear more
than once in a UNIQUENESS clause. A UNIQUENESS clause containing
zero attributes indicates that it's possible for two instances of the
PRC to have identical values for all attributes except, of course,
for the one named in the PIB-INDEX clause.
If a PRC and its sparsely augmenting PRC both have UNIQUENESS
clauses, then the UNIQUENESS constraint for instances of each PRC
MUST be applied according to the UNIQUENESS clause in the
corresponding PRC definition. Note that a sparsely augmenting PRC
thus can override the UNIQUENESS clause of the PRC it sparsely
augments.
Even though the UNIQUENESS clause is optional, its inclusion is
recommended wherever it provides useful information.
7.10. Mapping of the PIB-REFERENCES clause
The PIB-REFERENCES clause, which must be present for any attribute
which has the SYNTAX of ReferenceId, and must be absent otherwise,
names the PRC, an instance of which is referenced by the ReferenceId
attribute. For example usages of the PIB-REFERENCES clause, see
Appendix B.
7.11. Mapping of the PIB-TAG clause
The PIB-TAG clause, which must be present for an attribute which has
the SYNTAX TagReferenceId, and must be absent otherwise, is used to
indicate that this attribute references a "tag list" of instances of
another PRC. Such a tag list (similar in concept to the usage of the
same term in [APPL]) is formed by all instances of the other PRC
which have the same (tag) value of a particular attribute of that
other PRC. The particular attribute of the other PRC, which must
have the SYNTAX TagId, is named in the PIB-TAG clause. For an
example usage of the PIB-TAG clause, see Appendix B.
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8. Mapping of the OBJECT-IDENTITY macro
The OBJECT-IDENTITY macro is used in PIB modules to define
information about an OBJECT IDENTIFIER assignment.
9. Mapping of the OBJECT-GROUP macro
For conformance purposes, it is useful to define a conformance group
as a collection of related PRCs and their attributes. The OBJECT-
GROUP macro (directly) defines the collection of attributes which
belong to a conformance group. Since each attribute included in the
collection belongs to a PRC, the collection of related PRCs which
belong to a conformance group is also specified (indirectly) as the
set of PRCs to which the included attributes belong.
9.1. Mapping of the OBJECTS clause
The OBJECTS clause, which must be present, is used to specify each
attribute contained in the conformance group. Each of the specified
attributes must be defined in the same PIB module as the OBJECT-GROUP
macro appears.
It is required that every attribute defined in a PIB module be
contained in at least one conformance group. This avoids the common
error of adding a new attribute to a module and forgetting to add the
new attribute to a group.
10. Mapping of the MODULE-COMPLIANCE macro
The MODULE-COMPLIANCE macro is used to convey a minimum set of
requirements with respect to implementation of one or more PIB
modules.
A requirement on all "standard" PIB modules is that a corresponding
MODULE-COMPLIANCE specification is also defined, either in the same
module or in a companion module.
10.1. Mapping of the MODULE clause
The MODULE clause, which must be present, is repeatedly used to name
each PIB module for which compliance requirements are being
specified. Each PIB module is named by its module name, and
optionally, by its associated OBJECT IDENTIFIER as well. The module
name can be omitted when the MODULE-COMPLIANCE invocation occurs
inside a PIB module, to refer to the encompassing PIB module.
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10.1.1. Mapping of the MANDATORY-GROUPS clause
The MANDATORY-GROUPS clause, which need not be present, names the one
or more conformance groups within the correspondent PIB module which
are unconditionally mandatory for implementation. If an agent claims
compliance to the PIB module, then it must implement each and every
attribute (and therefore the PRCs to which they belong) within each
conformance group listed.
10.1.2. Mapping of the GROUP clause
The GROUP clause, which need not be present, is repeatedly used to
name each conformance group which is conditionally mandatory for
compliance to the PIB module. The GROUP clause can also be used to
name unconditionally optional groups. A group named in a GROUP
clause must be absent from the correspondent MANDATORY-GROUPS clause.
Conditionally mandatory groups include those which are mandatory only
if a particular protocol is implemented, or only if another group is
implemented. A GROUP clause's DESCRIPTION specifies the conditions
under which the group is conditionally mandatory.
A group which is named in neither a MANDATORY-GROUPS clause nor a
GROUP clause, is unconditionally optional for compliance to the PIB
module.
10.1.3. Mapping of the OBJECT clause
The OBJECT clause, which need not be present, is repeatedly used to
specify each attribute for which compliance has a refined requirement
with respect to the PIB module definition. The attribute must be
present in one of the conformance groups named in the correspondent
MANDATORY-GROUPS clause or GROUP clauses.
By definition, each attribute specified in an OBJECT clause follows a
MODULE clause which names the PIB module in which that attribute is
defined. Therefore, the use of an IMPORTS statement, to specify from
where such attributes are imported, is redundant and is not required
in a PIB module.
10.1.3.1. Mapping of the SYNTAX clause
The SYNTAX clause, which need not be present, is used to provide a
refined SYNTAX for the attribute named in the correspondent OBJECT
clause. The refined syntax is the minimum level of support needed
for this attribute in order to be compliant.
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10.1.3.2. Mapping of the WRITE-SYNTAX clause
The WRITE-SYNTAX clause is not supported by the SPPI.
10.1.3.3. Mapping of the PIB-MIN-ACCESS clause
The PIB-MIN-ACCESS clause, which need not be present, is used to
define the minimal level of access for the attribute named in the
correspondent OBJECT clause. If this clause is absent, the minimal
level of access is the same as the maximal level specified in the
PIB-ACCESS clause of the correspondent invocation of the OBJECT-TYPE
macro. If present, this clause must specify a subset of the access
specified in the correspondent PIB-ACCESS clause, where: "install" is
a subset of "install-notify", "notify" is a subset of "install-
notify", and "not- accessible" is a subset of all other values.
An implementation is compliant if the level of access it provides is
the same or a superset of the minimal level in the MODULE-COMPLIANCE
macro and the same or a subset of the maximal level in the PIB-ACCESS
clause.
11. Textual Conventions
When designing a PIB module, it is often useful to define new data
types similar to those defined in the SPPI. In comparison to a type
defined in the SPPI, each of these new types has a different name, a
similar syntax, and specific semantics. These newly defined types
are termed textual conventions, and are used for the convenience of
humans reading the PIB module.
Attributes defined using a textual convention are always encoded by
means of the rules that define their underlying type.
11.1. Mapping of the TEXTUAL-CONVENTION macro
The TEXTUAL-CONVENTION macro is used to convey the syntax and
semantics associated with a textual convention. It should be noted
that the expansion of the TEXTUAL-CONVENTION macro is something which
conceptually happens during implementation and not during run-time.
The name of a textual convention must consist of one or more letters
or digits, with the initial character being an upper case letter.
The name must not conflict with any of the reserved words listed in
section 5.2, should not consist of all upper case letters, and shall
not exceed 64 characters in length. (However, names longer than 32
characters are not recommended.) The hyphen is not allowed in the
name of a textual convention (except for use in information modules
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converted from SMIv1 which allowed hyphens in ASN.1 type
assignments). Further, all names used for the textual conventions
defined in all "standard" PIB modules shall be unique.
11.1.1. Mapping of the DISPLAY-HINT clause
The DISPLAY-HINT clause, which need not be present, gives a hint as
to how the value of an instance of an object with the syntax defined
using this textual convention might be displayed. The DISPLAY-HINT
clause must not be present if the Textual Convention is defined with
a syntax of: OBJECT IDENTIFIER, or any enumerated syntax (BITS or
INTEGER). The determination of whether it makes sense for other
syntax types is dependent on the specific definition of the Textual
Convention.
The rules for the format specification of the hint are the same as
specified in Section 3.1 of [TC].
11.1.2. Mapping of the SYNTAX clause
The SYNTAX clause, which must be present, defines abstract data
structure corresponding to the textual convention. The data
structure must be one of the following: a base type (see the SYNTAX
clause of an OBJECT-TYPE macro), or the BITS construct. Note that
this means that the SYNTAX clause of a Textual Convention can not
refer to a previously defined Textual Convention.
11.1.2.1. Sub-typing of Textual Conventions
The SYNTAX clause of a TEXTUAL CONVENTION macro may be sub-typed in
the same way as the SYNTAX clause of an OBJECT-TYPE macro.
12. Extending a PIB Module
PIBs may be revised as implementation experience is gained. However,
changes with potential to cause disruption to interoperability
between the previous PIB and the revised PIB are not allowed.
12.1. PIB Modules
For any change, the invocation of the MODULE-IDENTITY macro must be
updated to include information about the revision: specifically,
updating the LAST-UPDATED clause, adding a pair of REVISION and
DESCRIPTION clauses, and making any necessary changes to existing
clauses, including the ORGANIZATION and CONTACT-INFO clauses.
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Note that any definition contained in an existing PIB is available to
be IMPORT-ed by any other PIB, and is referenced in an IMPORTS clause
via the PIB module name. Thus, a PIB module name should not be
changed. Definitions should not be moved from one PIB to another.
Also note that obsolete definitions must not be removed from PIB
modules since their descriptors may still be referenced by other PIB
modules, and the OBJECT IDENTIFIERs used to name them must never be
re-assigned. The EXTENDS/AUGMENTS clause should be used to extend
previous definitions depending on the information to be represented.
Changes to an existing PIB can be made in several ways:
- Additional PRCs can be added to a PIB or an existing one
deprecated.
- Attributes can be added to, or deprecated from, an existing PRC.
Note that an ASN.1 value of the correct type or an ASN.1 NULL
value must be sent even for deprecated attributes to maintain
interoperability. New attributes must be added in sequence after
the existing ones.
- An existing PRC can be extended or augmented with a new PRC
defined in another (perhaps enterprise specific) PIB.
Additional named-number enumerations may be added to a SUBJECT-
CATEGORIES clause.
12.2. Object Assignments
If any non-editorial change is made to any clause of a object
assignment, then the OBJECT IDENTIFIER value associated with that
object assignment must also be changed, along with its associated
descriptor. Note that the max subid for PRC attributes is 127 (See
Section 7.1.8)
12.3. Object Definitions
An object definition may be revised in any of the following ways:
- A SYNTAX clause containing an enumerated INTEGER may have new
enumerations added or existing labels changed. Similarly, named
bits may be added or existing labels changed for the BITS
construct.
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- The value of a SYNTAX clause may be replaced by a textual
convention, providing the textual convention is defined to use the
same primitive ASN.1 type, has the same set of values, and has
identical semantics.
- A UNITS clause may be added.
- A STATUS clause value of "current" may be revised as "deprecated"
or "obsolete". Similarly, a STATUS clause value of "deprecated"
may be revised as "obsolete". When making such a change, the
DESCRIPTION clause should be updated to explain the rationale.
- Clarifications and additional information may be included in the
DESCRIPTION clause.
- An INSTALL-ERRORS clause may be added or an existing INSTALL-
ERRORS clause have additional errors defined.
- A REFERENCE clause may be added or updated.
- A DEFVAL clause may be added or updated.
- A PRC may be augmented by adding new objects at the end of the
row, and making the corresponding update to the SEQUENCE
definition.
- Entirely new objects may be defined, named with previously
unassigned OBJECT IDENTIFIER values.
Otherwise, if the semantics of any previously defined object are
changed (i.e., if a non-editorial change is made to any clause other
than those specifically allowed above), then the OBJECT IDENTIFIER
value associated with that object must also be changed. Note that
changing the descriptor associated with an existing object is
considered a semantic change, as these strings may be used in an
IMPORTS statement.
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Appendix A: Mapping a PIB to a MIB
Since the SPPI is modelled on the SMI, a PIB can be potentially
algorithmically mapped into a MIB. This mapping is achieved by means
of the following rules:
- Modify the module's module name by appending "-MIB" to the name.
- Change the OID assigned to the MODULE-IDENTITY to be different
value.
- Replace the keyword PIB-DEFINITIONS with the keyword DEFINITIONS.
- Modify the module names of all external references to PIB modules
by appending "-MIB" to each such module name.
- For each PRC definition, if an INDEX clause is absent, change the
"PIB-INDEX" keyword to "INDEX"; otherwise, delete the PIB-INDEX
clause.
- Delete all of the following clauses: PIB-ACCESS, PIB-REFERENCES,
PIB-TAG, UNIQUENESS, INSTALL-ERRORS, and SUBJECT-CATEGORIES.
- Change all PIB-MIN-ACCESS clauses to MIN-ACCESS clauses, modifying
"install" and "install-notify" to "read-create", and "notify" to
"read-only".
- Add a MAX-ACCESS clause for each OBJECT-TYPE. For each table
definition and row definition, the MAX-ACCESS is "not-accessible".
For each attribute that is in the INDEX clause, the MAX-ACCESS is
"not-accessible". For the remaining attributes, the MAX-ACCESS is
"read-create".
- Add a columnar attribute of type RowStatus with a descriptor and
appropriate DESCRIPTION. The descriptor can be formed by
appending the nine characters "RowStatus" to the end of the PRC's
descriptor (truncated if necessary to avoid the resulting
descriptor being too long). A Subid beyond 127 (i.e., 128 and
above) can be used as the OID for this columnar attribute.
- Modify any SYNTAX clause which has a base data type which is not
allowed in the SMI, either to be a valid SMI data type or to omit
the OBJECT-TYPE or TEXTUAL-CONVENTION definition and all
references to it. Since it is not clear (at this time) which is
the best SMI data type to use, the conversion SHOULD provide a
configurable option allowing a choice from at least the following:
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- convert to an OCTET STRING of the relevant size. Specifically,
this option would map both Integer64 and Unsigned64 to OCTET
STRING (SIZE(8)), or
- omit them from the conversion, or
- map Integer64 and Unsigned64 to Counter64 (even though this has
problems representing negative numbers, and unwanted counter
semantics.)
Appendix B: Example usage of PIB-REFERENCES and PIB-TAG clauses
The following example demonstrates the use of the PIB-REFERENCES and
PIB-TAG clauses.
In this example, the PIB-REFERENCES clause is used by the
qosIfDscpMapQueue attribute to indicate the PRC of which it
references an instance, and similarly, by the qosIfDscpMapThresh
attribute.
The qosIfDscpMapTable PRC has an instance for each DSCP of a
particular "map", but there is no PRC defined for a map itself;
rather, a map consists of all instances of qosIfDscpMapTable which
have the same value of qosIfDscpMapMapId. That is, a tag list is
formed by all instances of qosIfDscpMapTable which have the same
value of qosIfDscpMapMapId. This tag list is referenced by the
attribute qosIfDscpAssignDscpMap, and its use of the PIB-TAG clause
indicates this.
qosIfDscpAssignTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfDscpAssignEntry
PIB-ACCESS install
STATUS current
DESCRIPTION " "
::= { qosIfParameters 9 }
qosIfDscpAssignEntry OBJECT-TYPE
SYNTAX QosIfDscpAssignEntry
STATUS current
DESCRIPTION
"An instance of the qosIfDscpAssign class."
PIB-INDEX { qosIfDscpAssignPrid }
UNIQUENESS { qosIfDscpAssignName, qosIfDscpAssignRoles }
::= { qosIfDscpAssignTable 1 }
QosIfDscpAssignEntry ::= SEQUENCE {
qosIfDscpAssignPrid InstanceId,
qosIfDscpAssignName SnmpAdminString,
McCloghrie, et al. Standards Track [Page 33]
RFC 3159 SPPI August 2001
qosIfDscpAssignRoles RoleCombination,
qosIfDscpAssignDscpMap TagReferenceId
}
qosIfDscpAssignDscpMap OBJECT-TYPE
SYNTAX TagReferenceId
PIB-TAG { qosIfDscpMapMapId } -- attribute defined below
STATUS current
DESCRIPTION
"The DSCP map which is applied to interfaces of type
qosIfDscpAssignName which have a role combination of
qosIfDscpAssignRoles."
::= { qosIfDscpAssignEntry 3 }
--
-- DSCP to Queue and Threshold Mapping Table
--
qosIfDscpMapTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfDscpMapEntry
PIB-ACCESS install
STATUS current
DESCRIPTION
"Assigns DSCP values to queues and thresholds for an arbitrary
DSCP map. This map can then be assigned to various interface
and role combination pairs."
::= { qosIfParameters 10 }
qosIfDscpMapEntry OBJECT-TYPE
SYNTAX QosIfDscpMapEntry
STATUS current
DESCRIPTION
"An instance of the qosIfDscpMap class."
PIB-INDEX { qosIfDscpMapPrid }
UNIQUENESS { qosIfDscpMapMapId, qosIfDscpMapDscp }
::= { qosIfDscpMapTable 1 }
QosIfDscpMapEntry ::= SEQUENCE {
qosIfDscpMapPrid InstanceId,
qosIfDscpMapMapId TagId,
qosIfDscpMapDscp Dscp,
qosIfDscpMapQueue ReferenceId,
qosIfDscpMapThresh ReferenceId
}
qosIfDscpMapMapId OBJECT-TYPE
SYNTAX TagId
STATUS current
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RFC 3159 SPPI August 2001
DESCRIPTION
"An integer that identifies the DSCP map to which this PRI
belongs."
::= { qosIfDscpMapEntry 2 }
qosIfDscpMapQueue OBJECT-TYPE
SYNTAX ReferenceId
PIB-REFERENCES { qosIfQueueEntry }
STATUS current
DESCRIPTION
"This attribute maps the DSCP specified by qosIfDscpMapDscp to
the queue identified by qosIfQueuePrid in qosIfQueueTable.
For a given DSCP map, all the queues must belong to a single
queue set."
::= { qosIfDscpMapEntry 4 }
qosIfDscpMapThresh OBJECT-TYPE
SYNTAX ReferenceId
PIB-REFERENCES { qosIfThresholdEntry }
STATUS current
DESCRIPTION
"This attribute maps the DSCP specified by qosIfDscpMapDscp to
the threshold identified by qosIfThresholdId in
qosIfThresholdTable. The threshold set to which this
threshold belongs must be assigned to the queue specified by
qosIfDscpMapQueue."
::= { qosIfDscpMapEntry 5 }
Security Considerations
This document defines a language with which to define provisioning
information. The language itself has no security impact on the
Internet.
IANA Considerations
The root of the subtree administered by the Internet Assigned Numbers
Authority (IANA) for the Internet is:
internet OBJECT IDENTIFIER ::= { iso 3 6 1 }
That is, the Internet subtree of OBJECT IDENTIFIERs starts with the
prefix:
1.3.6.1.
Several branches underneath this subtree are used for network
management:
McCloghrie, et al. Standards Track [Page 35]
RFC 3159 SPPI August 2001
mgmt OBJECT IDENTIFIER ::= { internet 2 }
experimental OBJECT IDENTIFIER ::= { internet 3 }
private OBJECT IDENTIFIER ::= { internet 4 }
enterprises OBJECT IDENTIFIER ::= { private 1 }
The mgmt(2) subtree is used to identify "standard" objects.
This document defines
pib OBJECT IDENTIFIER ::= { mgmt 2 }
as the root for PIBs defined to be carried over [COPS-PR]. This
Object Identifier is a high level assignment that needs to be
registered with [IANA]. Root Object Identifiers for future "standards
track" PIBs will also need to be registered and MUST use Object
Identifiers below this oid. A standards track PIB can only be
assigned an OID by IANA if the PIB is approved by the IESG as a
"standards track" document. Experimental and enterprise PIBs MUST be
defined under the "experimental" and "enterprises" Object Identifiers
respectively.
The PIB module "copsPrSppiTc" is defined in this document as a
standard module and hence, needs a subid assignment under the "pib"
oid from IANA.
SPPI SUBJECT-CATEGORIES are mapped to COPS Client Types. IANA
Considerations for SUBJECT-CATEGORIES follow the same requirements as
specified in [COPS] IANA Considerations for COPS Client Types. Thus,
a new PIB can define a new COPS Client Type in the "standards",
"experimental" or "enterprise" space, and when approved that would
mean that a new COPS Client Type gets assigned. IANA must update the
registry for COPS Client Types (where applicable as described in
[COPS] IANA Considerations) as a result.
McCloghrie, et al. Standards Track [Page 36]
RFC 3159 SPPI August 2001
Authors' Addresses
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706 USA
Phone: +1 408 526 5260
Email: kzm@cisco.com
Michael Fine
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706 USA
Phone: +1 408 527 8218
EMail: mfine@cisco.com
John Seligson
Nortel Networks, Inc.
4401 Great America Parkway
Santa Clara, CA 95054 USA
Phone: +1 408 495 2992
EMail: jseligso@nortelnetworks.com
Kwok Ho Chan
Nortel Networks, Inc.
600 Technology Park Drive
Billerica, MA 01821 USA
Phone: +1 978 288 8175
EMail: khchan@nortelnetworks.com
Scott Hahn
Intel
2111 NE 25th Avenue
Hillsboro, OR 97124 USA
Phone: +1 503 264 8231
EMail: scott.hahn@intel.com
McCloghrie, et al. Standards Track [Page 37]
RFC 3159 SPPI August 2001
Ravi Sahita
Intel
2111 NE 25th Avenue
Hillsboro, OR 97124 USA
Phone: +1 503 712 1554
EMail: ravi.sahita@intel.com
Andrew Smith
Allegro Networks
6399 San Ignacio Ave.
San Jose, CA 95119 USA
Fax: +1 415 345 1827
EMail: andrew@allegronetworks.com
Francis Reichmeyer
PFN Inc.
University Park at MIT
26 Landsdowne Street
Cambridge, MA 02139 USA
Phone: +1 617 494 9980
EMail: franr@pfn.com
References
[COPS] Boyle, J., Cohen, R., Durham, D., Herzog, S.,
Rajan, R. and A. Sastry, "The COPS (Common Open
Policy Service) Protocol", RFC 2748, January
2000.
[COPS-RSVP] Boyle, J., Cohen, R., Durham, D., Herzog, S.,
Rajan, R. and A. Sastry, " COPS usage for
RSVP", RFC 2749, January 2000.
[COPS-PR] Reichmeyer, F., Herzog, S., Chan, K., Durham,
D., Yavatkar, R., Gai, S., McCloghrie, K. and
A. Smith, "COPS Usage for Policy Provisioning",
RFC 3084, March 2001.
[SMI] McCloghrie, K., Perkins, D., Schoenwaelder, J.,
Case, J., Rose, M. and S. Waldbusser,
"Structure of Management Information Version 2
(SMIv2)", STD 58, RFC 2578, April 1999.
McCloghrie, et al. Standards Track [Page 38]
RFC 3159 SPPI August 2001
[TC] McCloghrie, K., Perkins, D., Schoenwaelder, J.,
Case, J., Rose, M. and S. Waldbusser, "Textual
Conventions for SMIv2", STD 58, RFC 2579, April
1999.
[CONF] McCloghrie, K., Perkins, D., Schoenwaelder, J.,
Case, J., Rose, M. and S. Waldbusser,
"Conformance Statements for SMIv2", STD 58, RFC
2580, April 1999.
[APPL] Levi, D., Meyer, P. and B. Stewart, "SNMP
Applications", RFC 2573, April 1999.
[ASN1] Information processing systems -- Open Systems
Interconnection -- Specification of Abstract
Syntax Notation One (ASN.1), International
Organization for Standardization.
International Standard 8824, December 1987.
[INETADDR] Daniele, M., Haberman, B., Routhier, S. and J.
Schoenwaelder "Textual Conventions for Internet
Network Addresses", RFC 2851, June 2000.
[IANA] http://www.isi.edu/in-notes/iana/assignments/smi-numbers
[IANA-CONSIDERATIONS] Alvestrand, H. and T. Narten, "Guidelines for
Writing an IANA Considerations Section in
RFCs", BCP 26, RFC 2434, October 1998.
[RFC2119] Bradner, S., "Key words for use in RFCs to
Indicate Requirement Levels", BCP 14, RFC 2119,
March 1997.
McCloghrie, et al. Standards Track [Page 39]
RFC 3159 SPPI August 2001
Full Copyright Statement
Copyright (C) The Internet Society (2001). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
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included on all such copies and derivative works. However, this
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The limited permissions granted above are perpetual and will not be
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HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
McCloghrie, et al. Standards Track [Page 40]