One document matched: draft-ietf-rap-acct-fr-pib-00.txt
Internet Draft Diana Rawlins
Expiration: May 2001 WorldCom
File: draft-ietf-rap-acct-fr-pib-00.txt Amol Kulkarni
Intel
Kwok Ho Chan
Nortel Networks
Dinesh Dutt
Cisco
Framework of COPS-PR Policy Information Base for Accounting Usage
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-
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Internet-Drafts are draft documents valid for a maximum of six
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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.
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
[RFC-2119].
Abstract
Currently there are no policy classes defined for the PEP to convey
provisioned policy usage feedback to the PDP. The purpose of this
document is to define the accounting framework PIB that specifies
the policy classes common for COPS accounting type reports. The
basic operation and objects for reporting usage information are
defined in [COPS]. A specific clientSI accounting type object named
REPORT is defined in [COPS-PR]. This document further describes
operational behavior that is implied in [COPS] and [COPS-PR.]
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Table Of Contents
1 Introduction.....................................................3
2 General Concepts.................................................3
2.1 Overview.......................................................3
2.2 Normal Operation...............................................3
2.3 Failover.......................................................4
2.4 Context........................................................4
2.5 Delete Request States..........................................4
2.6 Periodic nature of report accounting...........................5
3 Definition of Accounting Type Report Policy......................5
4 Summary of the Accounting Framework Policy Information Base......6
4.1 SPPI ACCESS clause Report......................................6
4.2 Textual Conventions Counts.....................................7
4.3 Accounting Type Report Group and PRCs..........................7
4.3.1 The Accounting Type Report Device Table......................7
4.3.2 The Accounting Type Report Resume Table......................7
4.3.3 The Accounting Type Report Linkage Table.....................7
4.3.4 The Filter Usage Table.......................................7
5 The Accounting Framework PIB Module..............................8
6 Security Considerations.........................................14
7 Acknowledgements................................................14
8 Authors' Addresses..............................................14
9 References......................................................15
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1 Introduction
Policy usage reported by the PEP makes a richer set of information
available to the PDP for decision-making. This report accounting
information can influence future decisions made by the PDP and the
resulting policy installed by the PDP at the PEP. For example, A PDP
determining policy for a SIP signaled multimedia session may need to
base the decision in part on usage information related to previously
installed QoS policy decisions. Further, the PDP may coordinate this
usage information with other external systems to determine the
future policy such as the case with the PDP coordinating multimedia
session QoS and clearinghouse authorizations [SIP-AAA-QOS]
The scope of this document is to describe the policy class framework
for policy usage monitored and reported by the PEP and collected at
the PDP. The charging and billing models as well as other accounting
events detectable by the PDP are beyond the scope of this framework.
2 General Concepts
2.1 Overview
There are two aspects to defining policies for an accounting type
report ū the "who" aspect and the "what" aspect. The "who" is
referred to generically as the selection criteria policy class. The
"what" is referred to generically as the usage policy class. The
usage policy and selection policy are associated with one another.
The usage criteria policy class defines what is monitored, recorded
and reported by the PEP. The selection criteria policy class
specifies the conditions for the monitoring and recording of the
associated usage policy. For example, a usage policy may be defined
to provide counts of packets received. The selection criteria policy
may identify the filter on which to base the packet counts. A third
policy associates, or links, the selection and usage policies. This
is the accounting type report linkage policy.
2.2 Normal Operation
The PDP specifies the minimum accounting interval in the Accounting
Timer object that is included in the Client Accept message during
connection establishment. This specifies the frequency with which
the PEP issues unsolicited accounting type reports. The PEP notifies
the PDP of the maximum reporting interval as well as the selection
criteria policy classes and usage policy classes it supports during
the initial request for configuration data.
The PDP responds to the initial request for configuration with a
DECISION that installs policies. The PDP may also specify maximum
reporting intervals. The PEP monitors and records the usage per the
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selection criteria defined by the PDP. Periodically the PEP reports
the usage with an accounting type REPORT. The interval of the
reporting may be defined for the policy instance as long as the
interval does not conflict with the intervals specified in the
Client Accept or device reporting limitations.
While it is not anticipated, if the volume of the usage policy
instances for an accounting type report exceeds the maximum message
size, multiple report messages containing the usage policy instances
are constructed and issued to the PDP for that accounting interval.
The Report-Type Object has a new parameter, Continuation Flag. This
4-bit element is set to 0x1 to indicate additional report messages
are immediately following and contain information related to the
current report. The last accounting type report message in the
series for this particular accounting interval clears the
Continuation Flag.
The PDP is the collection point for the usage information monitored
and reported by the PEP clients within the administrative domain.
The PDP may also collect other accounting event information that is
outside the scope of this document.
2.3 Failover
In the event the connection is lost between the PEP and PDP, the PEP
continues to track usage information as long as it continues to
operate with the installed policy. When the locally installed policy
at the PEP expires, the usage policy data also expires.
Upon successful reconnection where the PEP is still caching policy,
the PDP indicates to the PEP that the PEP may resume sending of the
accounting type report messages. The PDP does this
deterministically. It issues an unsolicited decision containing the
frwkAtRptResumeIndicator set to resume reporting. The PDP is aware
of the request state Handle(s) and the supported PRCs either through
the state synchronization mechanism or because the PDP considers
itself synchronized with the PEP upon reconnection.
2.4 Context
The monitoring and recording of usage policies is subject to context
switches in a manner similar to enforcement policy. The usage policy
is monitored, recorded and reported while the associated PIB
instance is active. The PEP should retain existing accounting data
during inactive contexts and resume it's monitoring and reporting
when the PIB instance becomes active again.
2.5 Delete Request States
The PEP may send any outstanding accounting data monitored during
the interval to the PDP via an unsolicited report immediately prior
to issuing a Delete Request State if the time interval since the
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last report is not less than the interval defined by the Accounting
Timer. This is also the case when the PDP initiates the Delete
Request State with a decision request delete state.
2.6 Periodic nature of report accounting
The PDP informs the PEP of the minimal accounting interval it
supports in the Accounting Timer object during client connection
establishment. The PEP notifies the PDP of its maximum accounting
interval capability during the initial configuration request. The
PDP may specify accounting intervals in the specific accounting
policies per the PEP's indicated capabilities.
Generally the accounting policy is periodic in nature and the
reporting is unsolicited. The unsolicited reports are supplied
within the interval decided by the PDP. Note that periodic
unsolicited reports (as dictated by timer intervals) use a
deterministic amount of network resources.
There may be instances where the nature of the accounting policy for
a given client type or accounting PIB module is such that it is
useful for the PDP to control when it receives the feedback. The PDP
may therefore have the capability to solicit the accounting report.
3 Definition of Accounting Type Report Policy
There are three basic types of policy used to define what the PEP is
to monitor, record and report. These are the selection criteria
policy, the usage policy and the accounting type report linkage
policy.
The selection criteria policy is installed by the PDP. It defines
the conditions used by the PEP to monitor and record a usage policy.
Generally, the selection criterion is an existing PRC such as the
frwkIPFilterTable. This PRC is useful for specifying conditions on
which to base usage ū i.e. count the number of packets received for
this filter. The filter (source address, destination address, etc.)
in this case defines the conditions. In the case of the accounting
framework PIB, the frwkIPFilterTable is the only PRC used to base
selection on.
The usage policy defines what attributes are monitored and recorded
by the PEP. These policies have an ACCESS clause of Report.
Generally, the usage policies specify counts related to a specific
action such as a packet being dropped. The accounting framework PIB
defines one usage policy class, frwkAtRptFilterStats. It counts
packets and bytes as well as records the timestamp when the last
packet was received. Usage PRCs may be generic, collecting basic
statistics, or specific to a particular usage. The PDP decides which
PRC(s) best suit(s) its requirements. The PEP may support only one
usage PRC, in which case all statistics are gathered using instances
of that PRC. Alternatively, the PEP may support multiple usage PRCs.
The PDP then decides which PRC to associate with a particular
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selection criterion. Multiple selection criteria may be associated
with multiple instances of a single PRC.
The accounting type report linkage permits the same selection
criteria instance to be re-used for various usage policies. For
example, the same IP Filter selection criteria could be the basis of
different usage policies such as packet count, drop count, and
remark count. The accounting type report linkage references the
selection criteria instance as well as defines the policy class of
the usage PRC. As noted above, the selection criteria policy may be
used for enforcement policies as well as usage policies. This is the
case with the frwkIPFilterTable.
------------------- ----------------- -----------------
| | | | | |
| Select Criteria | |Linkage Instance| |Usage Instance |
| | |-instance ID | |- instance ID |
| -instance ID |<--|-PRID of select |-->|- PRID of Linkage|
| -conditionsą | |-PRC of usage | |- countsą |
| | | | | |
------------------- ---------------- -----------------
Figure 1
Figure 1 illustrates the relationship between a selection criteria,
linkage and usage policies.
The PDP is not aware of the instance identifier of the usage policy
when installing the selection criteria and accounting type report
linkage policies. The usage policy is enabled on the PEP by the
accounting type report linkage and the PEP designates the instance
identifier. The usage policy class always contains an attribute of
type Prid. This attribute contains the value of the accounting type
report linkage PRID [COPS-PR] installed by the PDP. The Prid type is
a textual convention for an object identifier that is the PRC of the
table used for the selection criteria and where the last sub-
identifier is an instance ID of the accounting type report linkage.
4 Summary of the Accounting Framework Policy Information Base
4.1 SPPI ACCESS clause Report
The selection criteria and linkage policy classes follow the
definitions specified by [SPPI.] This structure specifies well-
defined policy classes and their instances residing in a common,
virtual repository [FR-PIB.] The additional PIB-ACCESS clause
attribute of "report" denotes the usage policy class reported by the
PEP.
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4.2 Textual Conventions Counts
The usage policy attributes are often defined in the terms of
counts. This type is a non-negative value that is incremented. This
value is to "stick" at the maximum value if the maximum value is
reached before the reporting interval. It is reset to the value zero
after the usage is reported to the PDP and continues the incremental
operation. A textual convention defining the counts is defined in
the Accounting Framework PIB.
4.3 Accounting Type Report Group and PRCs
It is useful to define reporting intervals and restart
characteristics as well as the common usage and selection criteria
polices. These policy classes are common to account type reporting
for various technologies and apply to ALL SUBJECT-CATEGORIES. The
policy classes belong to a new group, Accounting Type Report Group.
The policy classes in the Accounting Type Report Group are:
1) Accounting Type Report Device Intervals Table
2) Accounting Type Report Linkage Table
3) Accounting Type Filter Statistics Usage Table
4.3.1 The Accounting Type Report Device Table
This table contains exactly one row. It defines the maximum
reporting interval in seconds that the PEP can support.
4.3.2 The Accounting Type Report Resume Table
This table contains one row. It indicates that the PDP, to which a
PEP having cached usage policy has reconnected, is ready to receive
the accounting type report messages from the PEP.
4.3.3 The Accounting Type Report Linkage Table
This table links the selection criteria instance with the usage
instance. It specifies the PRID of the selection criteria and the
PRC of the usage instance. This table permits the reuse of a
selection criteria instance for multiple usage policies.
The linkage table also permits the definition of a maximum reporting
interval to use when issuing the accounting type reports for the
usage instance. The interval is not to conflict with the maximum
interval for the device defined in the Accounting Type Report Device
Table.
4.3.4 The Filter Usage Table
This table describes the packet counts, byte counts, last timestamp
when a packet was received and the PRID of the associated Accounting
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Type Report Linkage instance. The count and timestamp information is
monitored and recorded by the PEP and supplied to the PDP with the
accounting type report message within the maximum interval
specified.
5 The Accounting Framework PIB Module
ACCOUNTING-FRAMEWORK-PIB PIB-DEFINITIONS ::= BEGIN
IMPORTS
ExtUTCTime, Unsigned32, Unsigned64, IpAddress,
Integer32, MODULE-IDENTITY, OBJECT-TYPE
FROM COPS-PR-SPPI
TruthValue, TEXTUAL-CONVENTION
FROM SNMPv2-TC
PolicyInstanceId, PolicyReferenceId
FROM COPS-PR-SPPI-TC;
RoleCombination
FROM POLICY-DEVICE-AUX-MIB;
acctPolFrameworkPib MODULE-IDENTITY
SUBJECT-CATEGORIES { all }
LAST-UPDATED "200011171000Z"
ORGANIZATION "IETF RAP WG"
CONTACT-INFO "
Diana Rawlins
WorldCom
901 International Parkway
Richardson, TX 75081
Phone: 972 729 1044
Email: diana.rawlins@wcom.com
Amol Kulkarni
JF3-206
2111 NE 25th Ave
Hillsboro, Oregon 97124
Phone: 503-712-1168
Email: amol.kulkarni@intel.com
Kwok Ho Chan
Nortel Networks, Inc.
600 Technology Park Drive
Billerica, MA 01821 USA
Phone: 978-288-8175
Email: khchan@nortelnetworks.com "
DESCRIPTION
"The PIB module containing the base set of policy rule
classes that are required for support of all accounting
and reporting policies"
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::= { tbd }
--
-- The accounting type report group
--
frwkAtRptGroupClasses
OBJECT IDENTIFIER ::= { acctPolFrameworkPib 2 }
--
-- Textual Conventions
--
Count ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A count represents a value used by attributes that
record policy usage. A count is of value zero or
greater and is incremented according to defined
policy usage. When the maximum value is reached, the
value sticks. The value is reset to zero upon
reporting the value to the PDP."
SYNTAX Unsigned64 ( 0..18446744073709551615)
--
-- The accounting type report device characteristics
--
frwkAtRptDevTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrwkAtRptDevEntry
PIB-ACCESS notify
STATUS current
DESCRIPTION
"This class contains a single PRI that specifies the
common reporting characteristics for the device."
::= { frwkAtRptGroupClasses 1}
frwkAtRptDevEntry OBJECT-TYPE
SYNTAX FrwkAtRptDevEntry
STATUS current
DESCRIPTION
"An instance of this class specifies the max
interval supported by the PEP."
::= { frwkAtRptDevTable 1}
FrwkAtRptDevEntry ::= SEQUENCE {
frwkAtRptDevPrid InstanceId,
frwkAtRptDevMax Unsigned32
}
frwkAtRptDevPrid OBJECT-TYPE
SYNTAX InstanceID
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STATUS current
DESCRIPTION
" An arbitrary integer index that uniquely identifies an
instance of the frwkAtRptDevTable class."
::= { frwkAtRptDevEntry 1}
frwkAtRptDevMax OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The maximum reporting interval in seconds between
accounting type reporting messages issued by the
PEP. "
::= { frwkAtRptDevEntry 2 }
--
-- resume reporting indicator
--
frwkAtRptResumeTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrwkAtRptResumeEntry
PIB-ACCESS install
STATUS current
DESCRIPTION
"This class contains a single PRI that indicates
that the PEP is to resume the sending of
accounting type reports."
::= { frwkAtRptGroupClasses 2}
frwkAtRptResumeEntry OBJECT-TYPE
SYNTAX FrwkAtRptResumeEntry
STATUS current
DESCRIPTION
"An instance of this class can indicate when to
resume sending accounting type reports
by the PEP."
::= { frwkAtRptResumeTable 1}
FrwkAtRptResumeEntry ::= SEQUENCE {
frwkAtRptResumePrid InstanceId,
frwkAtRptResumeIndicator INTEGER
}
frwkAtRptDevPrid OBJECT-TYPE
SYNTAX InstanceID
STATUS current
DESCRIPTION
" An arbitrary integer index that uniquely identifies an
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instance of the frwkAtRptResumeTable class."
::= { frwkAtRptResumeEntry 1}
frwkAtRptResumeIndicator OBJECT-TYPE
SYNTAX INTEGER {
NO_REPORTS(0),
SEND_REPORTS(1)
}
STATUS current
DESCRIPTION
"The value indicates if the PEP is to send cached
usage policies via accounting type report messages.
The enumeration values are:
(0) DonĘt send accounting type report messages
(1) Resume accounting type report messages. Send
cached usage policies now "
::= { frwkAtRptResumeEntry 2 }
--
-- The Accounting Type Report Linkage Table
--
frwkAtRptLinkTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrwkAtRptLinkEntry
PIB-ACCESS notify
STATUS current
DESCRIPTION
"This class associates the selection criteria with the
usage policy. It also permit the defining of the max
interval used for reporting the usage instance."
::= { frwkAtRptGroupClasses 3}
frwkAtRptLinkEntry OBJECT-TYPE
SYNTAX FrwkAtRptLinkEntry
STATUS current
DESCRIPTION
"This class associates the selection criteria with the
usage policy. It also permit the defining of the max
interval used for reporting the usage instance."
PIB-INDEX {frwkAtRptLinkId}
UNIQUENESS { frwkAtRptLinkId,
frwkAtRptLinkSel,
frwkAtRptLinkUsage }
::= {frwkAtRptLinkTable 1}
FrwkAtRptLinkEntry ::= SEQUENCE {
frwkAtRptLinkId InstanceID,
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frwkAtRptLinkSel Prid,
frwkAtRptLinkUsage OBJECT IDENTIFIER,
frwkAtRptLinkInterval Integer32
}
frwkAtRptLinkId OBJECT-TYPE
SYNTAX InstanceID
STATUS current
DESCRIPTION
" An arbitrary integer index that uniquely identifies an
instance of the frwkAtRptLinkTable class."
::= { frwkAtRptLinkEntry 1}
frwkAtRptLinkSel OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"The PRID of the selection criteria instance that
defines the conditions to use by the PEP for
monitoring the usage."
::= { frwkAtRptLinkEntry 2}
frwkAtRptLinkUsage OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The PRC of the usage policy class that the PEP uses to
monitor,record and report."
::= { frwkAtRptLinkEntry 3}
frwkAtRptInterval OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"Maximum interval in seconds between issuing accounting
type reports of this policy instance."
::= { frwkAtRptLinkEntry 4}
--
-- The filter statistics usage
--
frwkAtRptFilterStatsUsageTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrwkAtRptFilterStatsUsageEntry
PIB-ACCESS report
STATUS current
DESCRIPTION
"This class defines the usage attributes that the PEP
is to monitor, record and report. It contains the
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of the PRID of the linkage instance associating
the selection criteria instance with the usage
instance."
::= { frwkAtRptGroupClasses 4}
frwkAtRptFilterStatsUsageEntry OBJECT-TYPE
SYNTAX FrwkAtRptFilterStatsUsageEntry
STATUS current
DESCRIPTION
"Defines the attributes the PEP is to monitor,
record and report."
PIB-INDEX {frwkAtRptFilterStatsUsageId}
UNIQUENESS { frwkAtRptFilterStatsUsagePRID }
::= {frwkAtRptFilterStatsUsageTable 1}
FrwkAtRptFilterStatsUsageEntry ::= SEQUENCE {
frwkAtRptFilterStatsUsageId InstanceID,
frwkAtRptFilterStatsUsagePRID Prid,
frwkAtRptFilterStatsUsagePacketCount Counts,
frwkAtRptFilterStatsUsageByteCount Counts,
fwkAtRptFilterStatsUsageTimeStamp ExtUTCTime
}
frwkAtRptFilterStatsUsageId OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"Arbitrary integer index that uniquely identifies
an instance of the class."
::= { frwkAtRptFilterStatsUsageEntry 1 }
frwkAtRptFilterStatsUsagePRID OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"The PRID of the selection criteria policy instance
used to base this usage policy instance upon. The
PRID is composed of the PRC of the selection
criteria
Instance and the last sub-identifier is that value
Of the selection criteria policy instance."
::= { frwkAtRptFilterStatsUsageEntry 2 }
frwkAtRptFilterStatsUsagePacketCount OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The count of packets matching the specified filter
during the reporting interval."
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::= {frwkAtRptFilterStatsUsageEntry 3}
frwkAtRptFilterStatsUsageByteCount OBJECT-TYPE
SYNTAX Unsigned64
STATUS current
DESCRIPTION
"The byte count of packets matching the
specified filter during the reporting interval."
::= { frwkAtRptFilterStatsUsageEntry 4}
frwkAtRptFilterStatsSelectTimeStamp OBJECT-TYPE
SYNTAX ExtUTCTime
STATUS current
DESCRIPTION
"The last timestamp when a packet was received."
::= { frwkAtRptFilterStatsSelectEntry 5}
END
6 Security Considerations
The accounting information is sensitive and requires that
authorized messaging occur between the PEP and the PDP. This
protection can be accomplished with IPSEC between the PEP and the
PDP or using the security mechanisms described in the base COPS
protocol.
7 Acknowledgements
The authors would like to thank Dave Durham and Russell Fenger of
Intel and John K. Gallant of WorldCom for their contribution to
this document.
8 Authors' Addresses
Diana Rawlins
WorldCom
901 International Parkway
Richardson, Texas 75081
Phone: 972-729-1044
Email: Diana.Rawlins@wcom.com
Amol Kulkarni
JF3-206
2111 NE 25th Ave
Hillsboro, Oregon 97124
Phone: 503-712-1168
Email: amol.kulkarni@intel.com
Kwok Ho Chan
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Nortel Networks, Inc.
600 Technology Park Drive
Billerica, MA 01821 USA
Phone: 978-288-8175
Email: khchan@nortelnetworks.com
Dinesh G Dutt
Cisco Systems, Inc.
170 Tasman Dr.
San Jose, CA 95134-1706
Phone: 408-527-0955
Email: ddutt@cisco.com
9 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-PR] K. Chan, D. Durham, S. Gai, S. Herzog, K. McCloghrie, F.
Reichmeyer, J. Seligson, A. Smith, R. Yavatkar, "COPS Usage for
Policy Provisioning," draft-ietf-rap-cops-pr-02.txt, March 2000.
[SPPI] K. McCloghrie, et.al., "Structure of Policy Provisioning
Information," draft-ietf-rap-sppi-00.txt, march 2000.
[FR-PIB] M. Fine, K. McCloghrie, J. Seligson, K. Chan, S. Hahn, A.
Smith, F. Reichmeyer "Framework Policy Information Base", Internet
Draft , March 2000
[DSPIB] M. Fine, K. McCloghrie, J. Seligson, K. Chan, S. Han, A.
Smith, F. Reichmeyer, "Differentiated Services Quality of Service
Policy Information Base", Internet Draft, March 2000
[SIP-AAA-QOS] Gross, G.,Sinnreich, H. Rawlins D., Havinis, T. " QoS
and AAA Usage with SIP Based IP Communications" draft-gross-sipaq-
00.txt, November 2000.
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