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Versions: (draft-korhonen-dime-qos-parameters)
00 01 02 03 04 05 06 07 08 09 10 11
RFC 5624
Diameter Maintenance and J. Korhonen, Ed.
Extensions (DIME) TeliaSonera
Internet-Draft H. Tschofenig
Intended status: Standards Track Nokia Siemens Networks
Expires: December 11, 2007 June 9, 2007
Quality of Service Parameters for Usage with the AAA Framework
draft-ietf-dime-qos-parameters-00.txt
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This Internet-Draft will expire on December 11, 2007.
Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document defines a number of Quality of Service (QoS) parameters
that can be reused for conveying QoS information within RADIUS and
Diameter.
The payloads used to carry these QoS parameters are opaque for the
AAA client and the AAA server itself and interpreted by the
respective Resource Management Function.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology and Abbreviations . . . . . . . . . . . . . . . . 3
3. Parameter Overview . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Traffic Model Parameter . . . . . . . . . . . . . . . . . 3
3.2. Constraints Parameters . . . . . . . . . . . . . . . . . . 3
3.3. Traffic Handling Directives . . . . . . . . . . . . . . . 5
3.4. Traffic Classifiers . . . . . . . . . . . . . . . . . . . 5
4. Parameter Encoding . . . . . . . . . . . . . . . . . . . . . . 5
4.1. Header . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2. TMOD-1 Parameter . . . . . . . . . . . . . . . . . . . . . 5
4.3. TMOD-2 Parameter . . . . . . . . . . . . . . . . . . . . . 6
4.4. Path Latency Parameter . . . . . . . . . . . . . . . . . . 7
4.5. Path Jitter Parameter . . . . . . . . . . . . . . . . . . 7
4.6. Path PLR Parameter . . . . . . . . . . . . . . . . . . . . 8
4.7. Path PER Parameter . . . . . . . . . . . . . . . . . . . . 8
4.8. Slack Term> Parameter . . . . . . . . . . . . . . . . . . 9
4.9. Preemption Priority amp; Defending Priority Parameters . . 9
4.10. Admission Priority Parameter . . . . . . . . . . . . . . . 10
4.11. RPH Priority Parameter . . . . . . . . . . . . . . . . . . 10
4.12. Excess Treatment Parameter . . . . . . . . . . . . . . . . 12
4.13. PHB Class Parameter . . . . . . . . . . . . . . . . . . . 13
4.14. DSTE Class Type Parameter . . . . . . . . . . . . . . . . 14
4.15. Y.1541 QoS Class Parameter . . . . . . . . . . . . . . . . 14
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.1. Normative References . . . . . . . . . . . . . . . . . . . 16
8.2. Informative References . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17
Intellectual Property and Copyright Statements . . . . . . . . . . 19
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1. Introduction
This document defines a number of Quality of Service (QoS) parameters
that can be reused for conveying QoS information within RADIUS and
Diameter.
The payloads used to carry these QoS parameters are opaque for the
AAA client and the AAA server itself and interpreted by the
respective Resource Management Function.
2. Terminology and Abbreviations
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 [RFC2119].
3. Parameter Overview
3.1. Traffic Model Parameter
The Traffic Model (TMOD) parameter is a container consisting of four
sub-parameters:
o rate (r)
o bucket size (b)
o peak rate (p)
o minimum policed unit (m)
All four sub-parameters MUST be included in the TMOD parameter. The
TMOD parameter is a mathematically complete way to describe the
traffic source. If, for example, TMOD is set to specify bandwidth
only, then set r = peak rate = p, b = large, m = large. As another
example if TMOD is set for TCP traffic, then set r = average rate, b
= large, p = large.
3.2. Constraints Parameters
<Path Latency>, <Path Jitter>, <Path PLR>, and <Path PER> are QoS
parameters describing the desired path latency, path jitter and path
bit error rate respectively.
The <Path Latency> parameter refers to the accumulated latency of the
packet forwarding process associated with each QoS aware node along
the path, where the latency is defined to be the mean packet delay
added by each such node. This delay results from speed-of-light
propagation delay, from packet processing limitations, or both. The
mean delay reflects the variable queuing delay that may be present.
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The purpose of this parameter is to provide a minimum path latency
for use with services which provide estimates or bounds on additional
path delay [RFC2212].
The procedures for collecting path latency information are outside
the scope of this document.
The <Path Jitter> parameter refers to the accumulated jitter of the
packet forwarding process associated with each QoS aware node along
the path, where the jitter is defined to be the nominal jitter added
by each such node. IP packet jitter, or delay variation, is defined
in Section 3.4 of RFC 3393 [RFC3393], (Type-P-One-way-ipdv), and
where the selection function includes the packet with minimum delay
such that the distribution is equivalent to 2-point delay variation
in [Y.1540]. The suggested evaluation interval is 1 minute. This
jitter results from packet processing limitations, and includes any
variable queuing delay which may be present. The purpose of this
parameter is to provide a nominal path jitter for use with services
that provide estimates or bounds on additional path delay [RFC2212].
The procedures for collecting path jitter information are outside the
scope of this document.
The <Path PLR> parameter refers to the accumulated packet loss rate
(PLR) of the packet forwarding process associated with each QoS aware
node along the path where the PLR is defined to be the PLR added by
each such node.
The <Path PER> parameter refers to the accumulated packet error rate
(PER) of the packet forwarding process associated with each QoS aware
node, where the PER is defined to be the PER added by each such node.
The <Slack Term> parameter refers to the difference between desired
delay and delay obtained by using bandwidth reservation, and which is
used to reduce the resource reservation for a flow [RFC2212].
The <Preemption Priority> parameter refers to the priority of the new
flow compared with the <Defending Priority> of previously admitted
flows. Once a flow is admitted, the preemption priority becomes
irrelevant. The <Defending Priority> parameter is used to compare
with the preemption priority of new flows. For any specific flow,
its preemption priority MUST always be less than or equal to the
defending priority. <Admission Priority> and <RPH Priority> provide
an essential way to differentiate flows for emergency services, ETS,
E911, etc., and assign them a higher admission priority than normal
priority flows and best-effort priority flows.
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3.3. Traffic Handling Directives
The <Excess Treatment> parameter describes how a QoS aware node will
process excess traffic, that is, out-of-profile traffic. Excess
traffic MAY be dropped, shaped and/or remarked.
3.4. Traffic Classifiers
Resource reservations might refer to a packet processing with a
particular DiffServ per-hop behavior (PHB) [RFC2475] or to a
particular QoS class, e.g., Y.1541 QoS class or DiffServ-aware MPLS
traffic engineering (DSTE) class type [RFC3564], [RFC4124].
4. Parameter Encoding
4.1. Header
Each QoS parameter is encoded in TLV format using a similar parameter
header:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| Parameter ID |r|r|r|r| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
M Flag: When set indicates the subsequent parameter MUST be
interpreted. Otherwise the parameter can be ignored if not
understood.
The r bits are reserved.
Parameter ID: Assigned to each parameter (see below)
4.2. TMOD-1 Parameter
<TMOD-1> = <r> <b> <p> <m> [RFC2210] , [RFC2215]
The above notation means that the 4 <TMOD-1> sub-parameters must be
carried in the <TMOD-1> parameter. The coding for the <TMOD-1>
parameter is as follows:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 1 |r|r|r|r| 4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TMOD Rate-1 [r] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TMOD Size-1 [b] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Peak Data Rate-1 [p] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Minimum Policed Unit-1 [m] (32-bit unsigned integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The <TMOD> parameters are represented by three floating point numbers
in single-precision IEEE floating point format followed by one 32-bit
integer in network byte order. The first floating point value is the
rate (r), the second floating point value is the bucket size (b), the
third floating point is the peak rate (p), and the first unsigned
integer is the minimum policed unit (m).
When r, b, and p terms are represented as IEEE floating point values,
the sign bit MUST be zero (all values MUST be non-negative).
Exponents less than 127 (i.e., 0) are prohibited. Exponents greater
than 162 (i.e., positive 35) are discouraged, except for specifying a
peak rate of infinity. Infinity is represented with an exponent of
all ones (255) and a sign bit and mantissa of all zeroes.
4.3. TMOD-2 Parameter
A description of the semantic of the parameter values can be found in
[RFC2215]. The <TMOD-2> parameter may be needed in a DiffServ
environment. The coding for the <TMOD-2> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 2 |r|r|r|r| 4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TMOD Rate-2 [r] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TMOD Size-2 [b] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Peak Data Rate-2 [p] (32-bit IEEE floating point number) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Minimum Policed Unit-2 [m] (32-bit unsigned integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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When r, b, and p terms are represented as IEEE floating point values,
the sign bit MUST be zero (all values MUST be non-negative).
Exponents less than 127 (i.e., 0) are prohibited. Exponents greater
than 162 (i.e., positive 35) are discouraged, except for specifying a
peak rate of infinity. Infinity is represented with an exponent of
all ones (255) and a sign bit and mantissa of all zeroes.
4.4. Path Latency Parameter
A description of the semantic of the parameter values can be found in
[RFC2210],[RFC2215]. The coding for the <Path Latency> parameter is
as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 3 |r|r|r|r| 1 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| Path Latency (32-bit integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Path Latency is a single 32-bit integer in network byte order.
The composition rule for the <Path Latency> parameter is summation
with a clamp of (2**32 - 1) on the maximum value. The latencies are
average values reported in units of one microsecond. A system with
resolution less than one microsecond MUST set unused digits to zero.
The total latency added across all QoS aware nodes along the path can
range as high as (2**32)-2.
4.5. Path Jitter Parameter
The coding for the <Path Jitter> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 4 |r|r|r|r| 4 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| Path Jitter STAT1(variance) (32-bit integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Path Jitter STAT2(99.9%-ile) (32-bit integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Path Jitter STAT3(minimum Latency) (32-bit integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Path Jitter STAT4(Reserved) (32-bit integer) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Path Jitter is a set of four 32-bit integers in network byte
order. The Path Jitter parameter is the combination of four
statistics describing the Jitter distribution with a clamp of (2**32
- 1) on the maximum of each value. The jitter STATs are reported in
units of one microsecond.
4.6. Path PLR Parameter
The coding for the <Path PLR> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 5 |r|r|r|r| 1 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| Path Packet Loss Ratio (32-bit floating point) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Path PLR is a single 32-bit single precision IEEE floating point
number in network byte order. The PLRs are reported in units of
10^-11. A system with resolution less than one microsecond MUST set
unused digits to zero. The total PLR added across all QoS aware
nodes can range as high as 10^-1.
4.7. Path PER Parameter
The coding for the <Path PLR> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 6 |r|r|r|r| 1 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| Path Packet Error Ratio (32-bit floating point) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Path PER is a single 32-bit single precision IEEE floating point
number in network byte order. The PERs are reported in units of
10^-11. A system with resolution less than one microsecond MUST set
unused digits to zero. The total PER added across all QoS aware
nodes can range as high as 10^-1.
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4.8. Slack Term> Parameter
A description of the semantic of the parameter values can be found in
[RFC2212], [RFC2215]. The coding for the <Path PLR> parameter is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 7 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Slack Term [S] (32-bit integer) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Slack Term parameter S is nonnegative and is measured in
microseconds. S is represented as a 32-bit integer. Its value can
range from 0 to (2**32)-1 microseconds.
4.9. Preemption Priority amp; Defending Priority Parameters
A description of the semantic of the parameter values can be found in
[RFC3181].
The coding for the <Preemption Priority> & <Defending Priority> sub-
parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 8 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Preemption Priority | Defending Priority |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Preemption Priority: The priority of the new flow compared with the
defending priority of previously admitted flows. Higher values
represent higher priority.
Defending Priority: Once a flow is admitted, the preemption priority
becomes irrelevant. Instead, its defending priority is used to
compare with the preemption priority of new flows.
As specified in [RFC3181], <Preemption Priority> & <Defending
Priority> are 16-bit integer values.
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4.10. Admission Priority Parameter
A description of the semantic of the parameter values can be found in
[Y.1571]. The coding for the <Admission Priority> parameter is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 9 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Admis.Priority| (Reserved) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
High priority flows, normal priority flows, and best-effort priority
flows can have access to resources depending on their admission
priority value as follows:
Admission Priority:
0 - best-effort priority flow
1 - normal priority flow
2 - high priority flow
255 - not used
A reservation without an <Admission Priority> parameter (i.e., set to
255) MUST be treated as a reservation with an <Admission Priority> =
1.
4.11. RPH Priority Parameter
A description of the semantic of the parameter values can be found in
[RFC4412]. The coding for the <RPH Priority> parameter is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 10 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RPH Namespace | RPH Priority | (Reserved) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[RFC4412] defines a resource priority header (RPH) with parameters
"RPH Namespace" and "RPH Priority" combination, and if populated is
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applicable only to flows with high admission priority, as follows:
RPH Namespace:
0 - dsn
1 - drsn
2 - q735
3 - ets
4 - wps
255 - not used
Each namespace has a finite list of relative priority-values. Each
is listed here in the order of lowest priority to highest priority.
RPH Priority:
4 - q735.4
3 - q735.3
2 - q735.2
1 - q735.1
0 - q735.0
4 - ets.4
3 - ets.3
2 - ets.2
1 - ets.1
0 - ets.0
4 - wps.4
3 - wps.3
2 - wps.2
1 - wps.1
0 - wps.0
For the 4 priority parameters, the following cases are permissible
(procedures specified in references):
1 parameter: <Admission Priority> [Y.1571]
2 parameters: <Admission Priority>, <RPH Priority> [RFC4412]
2 parameters: <Preemption Priority>, <Defending Priority> [RFC3181]
3 parameters: <Preemption Priority>, <Defending Priority>,
<Admission Priority> [3GPP-1, 3GPP-2, 3GPP-3]
4 parameters: <Preemption Priority>, <Defending Priority>,
<Admission Priority>, <RPH Priority> [3GPP-1, 3GPP-2,
3GPP-3]
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It is permissible to have <Admission Priority> without <RPH
Priority>, but not permissible to have <RPH Priority> without
<Admission Priority> (alternatively <RPH Priority> is ignored in
instances without <Admission Priority>).
4.12. Excess Treatment Parameter
The coding for the <Excess Treatment> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 11 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Excess Trtmnt | Remark Value | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Excess Treatment: Indicates how the QoS aware node should process
out-of-profile traffic, that is, traffic not covered by the <Traffic>
parameter. Allowed values are as follows:
0: drop
1: shape
2: remark
3: no metering or policing is permitted
The default excess treatment in case that none is specified is that
there are no guarantees to excess traffic, i.e., a QoS aware node can
do what it finds suitable.
When excess treatment is set to 'drop', all marked traffic MUST be
dropped by a QoS aware node.
When excess treatment is set to 'shape', it is expected that the QoS
Desired object carries a TMOD parameter. Excess traffic is to be
shaped to this TMOD. When the shaping causes unbounded queue growth
at the shaper traffic can be dropped.
When excess treatment is set to 'remark', the excess treatment
parameter MUST carry the remark value. For example, packets may be
remarked to drop remarked to pertain to a particular QoS class. In
the latter case, remarking relates to a DiffServ-type model, where
packets arrive marked as belonging to a certain QoS class, and when
they are identified as excess, they should then be remarked to a
different QoS Class.
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If 'no metering or policing is permitted' is signaled, the QoS aware
node should accept the excess treatment parameter set by the sender
with special care so that excess traffic should not cause a problem.
To request the Null Meter [RFC3290] is especially strong, and should
be used with caution.
4.13. PHB Class Parameter
A description of the semantic of the parameter values can be found in
[RFC3140]. The coding for the <PHB Class> parameter is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 12 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DSCP |0 0 0 0 0 0 0 0 0 0| (Reserved) |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
As prescribed in [RFC3140], the encoding for a single PHB is the
recommended DSCP value for that PHB, left-justified in the 16 bit
field, with bits 6 through 15 set to zero.
The encoding for a set of PHBs is the numerically smallest of the set
of encodings for the various PHBs in the set, with bit 14 set to 1.
(Thus for the AF1x PHBs, the encoding is that of the AF11 PHB, with
bit 14 set to 1.)
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DSCP |0 0 0 0 0 0 0 0 X 0|
+---+---+---+---+---+---+---+---+
PHBs not defined by standards action, i.e., experimental or local use
PHBs as allowed by [RFC2474]. In this case an arbitrary 12 bit PHB
identification code, assigned by the IANA, is placed left-justified
in the 16 bit field. Bit 15 is set to 1, and bit 14 is zero for a
single PHB or 1 for a set of PHBs. Bits 12 and 13 are zero.
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PHD ID CODE |0 0 X 0|
+---+---+---+---+---+---+---+---+
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Bits 12 and 13 are reserved either for expansion of the PHB
identification code, or for other use, at some point in the future.
In both cases, when a single PHBID is used to identify a set of PHBs
(i.e., bit 14 is set to 1), that set of PHBs MUST constitute a PHB
Scheduling Class (i.e., use of PHBs from the set MUST NOT cause
intra-microflow traffic reordering when different PHBs from the set
are applied to traffic in the same microflow). The set of AF1x PHBs
[RFC2597] is an example of a PHB Scheduling Class. Sets of PHBs that
do not constitute a PHB Scheduling Class can be identified by using
more than one PHBID.
The registries needed to use [RFC3140] already exist. Hence, no new
registry needs to be created for this purpose.
4.14. DSTE Class Type Parameter
A description of the semantic of the parameter values can be found in
[RFC4124]. The coding for the <DSTE Class Type> parameter is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 13 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|DSTE Cls. Type | (Reserved) |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
DSTE Class Type: Indicates the DSTE class type. Values currently
allowed are 0, 1, 2, 3, 4, 5, 6, 7. A value of 255 (all 1's) means
that the <DSTE Class Type> parameter is not used.
4.15. Y.1541 QoS Class Parameter
A description of the semantic of the parameter values can be found in
[Y.1541]. The coding for the <Y.1541 QoS Class> parameter is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|r|r|r| 14 |r|r|r|r| 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Y.1541 QoS Cls.| (Reserved) |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
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Y.1541 QoS Class: Indicates the Y.1541 QoS Class. Values currently
allowed are 0, 1, 2, 3, 4, 5, 6, 7. A value of 255 (all 1's) means
that the <Y.1541 QoS Class> parameter is not used.
Class 0:
Mean delay <= 100 ms, delay variation <= 50 ms, loss ratio <=
10^-3. Real-time, highly interactive applications, sensitive to
jitter. Application examples include VoIP, Video Teleconference.
Class 1:
Mean delay <= 400 ms, delay variation <= 50 ms, loss ratio <=
10^-3. Real-time, interactive applications, sensitive to jitter.
Application examples include VoIP, Video Teleconference.
Class 2:
Mean delay <= 100 ms, delay variation unspecified, loss ratio <=
10^-3. Highly interactive transaction data. Application examples
include signaling.
Class 3:
Mean delay <= 400 ms, delay variation unspecified, loss ratio <=
10^-3. Interactive transaction data. Application examples
include signaling.
Class 4:
Mean delay <= 1 sec, delay variation unspecified, loss ratio <=
10^-3. Low Loss Only applications. Application examples include
short transactions, bulk data, video streaming.
Class 5:
Mean delay unspecified, delay variation unspecified, loss ratio
unspecified. Unspecified applications. Application examples
include traditional applications of default IP networks.
Class 6:
Mean delay <= 100 ms, delay variation <= 50 ms, loss ratio <=
10^-5. Applications that are highly sensitive to loss, such as
television transport, high-capacity TCP transfers, and TDM circuit
emulation.
Class 7:
Mean delay <= 400 ms, delay variation <= 50 ms, loss ratio <=
10^-5. Applications that are highly sensitive to loss, such as
television transport, high-capacity TCP transfers, and TDM circuit
emulation.
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5. IANA Considerations
This document reuses the namespace created in [I-D.ietf-nsis-qspec].
No actions are required by IANA.
6. Security Considerations
This document does not raise any security concerns as it only defines
QoS parameters.
7. Acknowledgements
The authors would like to thank the NSIS QSPEC [I-D.ietf-nsis-qspec]
authors (Cornelia Kappler, Jerry Ash, Attila Bader, Dave Oran), the
NSIS working group chairs (John Loughney and Martin Stiemerling) and
the former Transport Area Directors (Allison Manking, Jon Peterson)
for their help.
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2210] Wroclawski, J., "The Use of RSVP with IETF Integrated
Services", RFC 2210, September 1997.
[RFC2212] Shenker, S., Partridge, C., and R. Guerin, "Specification
of Guaranteed Quality of Service", RFC 2212,
September 1997.
[RFC2215] Shenker, S. and J. Wroclawski, "General Characterization
Parameters for Integrated Service Network Elements",
RFC 2215, September 1997.
[RFC2474] Nichols, K., Blake, S., Baker, F., and D. Black,
"Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers", RFC 2474,
December 1998.
[RFC2475] Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z.,
and W. Weiss, "An Architecture for Differentiated
Services", RFC 2475, December 1998.
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[RFC2597] Heinanen, J., Baker, F., Weiss, W., and J. Wroclawski,
"Assured Forwarding PHB Group", RFC 2597, June 1999.
[RFC3140] Black, D., Brim, S., Carpenter, B., and F. Le Faucheur,
"Per Hop Behavior Identification Codes", RFC 3140,
June 2001.
[RFC3181] Herzog, S., "Signaled Preemption Priority Policy Element",
RFC 3181, October 2001.
[RFC3290] Bernet, Y., Blake, S., Grossman, D., and A. Smith, "An
Informal Management Model for Diffserv Routers", RFC 3290,
May 2002.
[RFC3393] Demichelis, C. and P. Chimento, "IP Packet Delay Variation
Metric for IP Performance Metrics (IPPM)", RFC 3393,
November 2002.
[RFC3564] Le Faucheur, F. and W. Lai, "Requirements for Support of
Differentiated Services-aware MPLS Traffic Engineering",
RFC 3564, July 2003.
[RFC4124] Le Faucheur, F., "Protocol Extensions for Support of
Diffserv-aware MPLS Traffic Engineering", RFC 4124,
June 2005.
[RFC4412] Schulzrinne, H. and J. Polk, "Communications Resource
Priority for the Session Initiation Protocol (SIP)",
RFC 4412, February 2006.
[Y.1541] "Network Performance Objectives for IP-Based Services", ,
2006.
8.2. Informative References
[I-D.ietf-nsis-qspec]
Ash, J., "QoS NSLP QSPEC Template",
draft-ietf-nsis-qspec-16 (work in progress), March 2007.
[Y.1540] "Internet Protocol Data Communication Service - IP Packet
Transfer and Availability Performance Parameters", ,
December 2002.
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Authors' Addresses
Jouni Korhonen (editor)
TeliaSonera
Teollisuuskatu 13
Sonera FIN-00051
Finland
Email: jouni.korhonen@teliasonera.com
Hannes Tschofenig
Nokia Siemens Networks
Otto-Hahn-Ring 6
Munich, Bavaria 81739
Germany
Email: Hannes.Tschofenig@siemens.com
URI: http://www.tschofenig.com
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