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RFC 4679

DSL Forum Vendor-Specific RADIUS Attributes

Pages: 25
Informational
Errata

Top   ToC   RFC4679 - Page 1
Network Working Group                                       V. Mammoliti
Request for Comments: 4679                                       G. Zorn
Category: Informational                                    Cisco Systems
                                                               P. Arberg
                                                  Redback Networks, Inc.
                                                             R. Rennison
                                                             ECI Telecom
                                                          September 2006


              DSL Forum Vendor-Specific RADIUS Attributes

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

IESG Note

   This RFC is not a candidate for any level of Internet Standard.  The
   IETF disclaims any knowledge of the fitness of this RFC for any
   purpose and in particular notes that the decision to publish is not
   based on IETF review for such things as security, congestion control,
   or inappropriate interaction with deployed protocols.  The RFC Editor
   has chosen to publish this document at its discretion.  Readers of
   this document should exercise caution in evaluating its value for
   implementation and deployment.  See RFC 3932 for more information.

Abstract

This document describes the set of Remote Authentication Dial-In User Service Vendor-Specific Attributes (RADIUS VSAs) defined by the DSL Forum. These attributes are designed to transport Digital Subscriber Line (DSL) information that is not supported by the standard RADIUS attribute set. It is expected that this document will be updated if and when the DSL Forum defines additional vendor-specific attributes, since its primary purpose is to provide a reference for DSL equipment vendors wishing to interoperate with other vendors' products.
Top   ToC   RFC4679 - Page 2

Table of Contents

1. Introduction ....................................................3 2. Terminology .....................................................3 2.1. Requirements Language ......................................3 2.2. Technical Terms and Acronyms ...............................3 3. Attributes ......................................................5 3.1. DSL Forum RADIUS VSA Definition ............................5 3.2. DSL Forum Vendor Specific Sub-Attribute Encoding ...........6 3.3. Sub-attribute Definitions ..................................6 3.3.1. Agent-Circuit-Id ....................................6 3.3.2. Agent-Remote-Id .....................................8 3.3.3. Actual-Data-Rate-Upstream ...........................9 3.3.4. Actual-Data-Rate-Downstream .........................9 3.3.5. Minimum-Data-Rate-Upstream .........................10 3.3.6. Minimum-Data-Rate-Downstream .......................11 3.3.7. Attainable-Data-Rate-Upstream ......................11 3.3.8. Attainable-Data-Rate-Downstream ....................12 3.3.9. Maximum-Data-Rate-Upstream .........................13 3.3.10. Maximum-Data-Rate-Downstream ......................13 3.3.11. Minimum-Data-Rate-Upstream-Low-Power ..............14 3.3.12. Minimum-Data-Rate-Downstream-Low-Power ............15 3.3.13. Maximum-Interleaving-Delay-Upstream ...............16 3.3.14. Actual-Interleaving-Delay-Upstream ................16 3.3.15. Maximum-Interleaving-Delay-Downstream .............17 3.3.16. Actual-Interleaving-Delay-Downstream ..............18 3.3.17. Access-Loop-Encapsulation .........................19 3.3.18. IWF-Session .......................................20 4. Table of Attributes ............................................21 5. Security Considerations ........................................21 6. References .....................................................22 6.1. Normative References ......................................22 6.2. Informative References ....................................22
Top   ToC   RFC4679 - Page 3

1. Introduction

The DSL Forum has created additional RADIUS [RFC2865] [RFC2866] vendor-specific attributes to carry DSL line identification and characterization information. This information is forwarded from the Access Node/DSLAM to the BRAS via Vendor-Specific PPPoE Tags [RFC2516], DHCP Relay Options [RFC3046], and Vendor-Specific Information Suboptions [RFC4243]. This document describes the subscriber line identification and characterization information and its mapping to RADIUS VSAs by the BRAS. The information acquired may be used to provide authentication and accounting functionality. It may also be collected and used for management and troubleshooting purposes.

2. Terminology

The following sections define the usage and meaning of certain specialized terms in the context of this document.

2.1. Requirements Language

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].

2.2. Technical Terms and Acronyms

AAL5 ATM Adaption Layer 5 [ITU.I363-5.1996] Access Node/DSLAM The Access Node/DSLAM is a DSL signal terminator that contains a minimum of one Ethernet interface that serves as its northbound interface into which it aggregates traffic from several Asynchronous Transfer Mode (ATM)-based (subscriber ports) or Ethernet-based southbound interfaces. BNG Broadband Network Gateway. A BNG is an IP edge router where bandwidth and QoS policies are applied; the functions performed by a BRAS are a superset of those performed by a BNG.
Top   ToC   RFC4679 - Page 4
   BRAS
      Broadband Remote Access Server.  A BRAS is a BNG and is the
      aggregation point for the subscriber traffic.  It provides
      aggregation capabilities (e.g., IP, PPP, Ethernet) between the
      access network and the core network.  Beyond its aggregation
      function, the BRAS is also an injection point for policy
      management and IP QoS in the access network.

   DSL
      Digital Subscriber Line.  DSL is a technology that allows digital
      data transmission over wires in the local telephone network.

   DSLAM
      Digital Subscriber Line Access Multiplexer.  DSLAM is a device
      that terminates DSL subscriber lines.  The data is aggregated and
      forwarded to ATM- or Ethernet-based aggregation networks.

   FCS
      Frame Check Sequence.  The FCS is a checksum added to an Ethernet
      frame for error detection/correction purposes.

   IPoA
      IP over ATM

   IWF
      Interworking Function.  The set of functions required for
      interconnecting two networks of different technologies (e.g., ATM
      and Ethernet).  IWF is utilized to enable the carriage of PPP over
      ATM (PPPoA) traffic over PPPoE.

   LLC
      Logical Link Control
Top   ToC   RFC4679 - Page 5

3. Attributes

The following subsections describe the Attributes defined by this document. These Attributes MAY be transmitted in one or more RADIUS Attributes of type Vendor-Specific [RFC2865]. More than one attribute MAY be transmitted in a single Vendor-Specific Attribute; if this is done, the attributes SHOULD be packed as a sequence of Vendor-Type/Vendor-Length/Value triples following the initial Type, Length, and Vendor-Id fields.

3.1. DSL Forum RADIUS VSA Definition

Description This Attribute functions as a "container", encapsulating one or more vendor-specific sub-attributes; the encoding follows the recommendations in [RFC2865]. A summary of the generic DSL Forum VSA format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Vendor-Id +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Id (cont) | Sub-Attribute(s)... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type 26 for Vendor-Specific Length This field MUST be set equal to the sum of the Vendor-Length fields of the sub-attributes contained in the Vendor-Specific Attribute, plus six (Type + Length + Vendor-Id). Vendor-Id This field MUST be set to decimal 3561, the enterprise number assigned to the ADSL Forum [IANA]. Sub-Attributes This field MUST contain one or more DSL Forum Vendor-Specific sub-attributes, as specified below.
Top   ToC   RFC4679 - Page 6

3.2. DSL Forum Vendor Specific Sub-Attribute Encoding

A summary of the sub-attribute format is shown below. The fields are transmitted from left to right. 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type The Vendor-Type field is one octet in length and contains the sub-attribute type, as assigned by the DSL Forum. Vendor-Length The Vendor-Length field is one octet and indicates the length of the entire sub-attribute, including the Vendor-Type, Vendor-Length, and Value fields. Value The Value field is zero or more octets and contains information specific to the sub-attribute. The format and length of the Value field is determined by the Vendor-Type and Vendor-Length fields. The format of the value field is one of 2 data types, string or integer [RFC2865].

3.3. Sub-attribute Definitions

The following sub-sections define the DSL Forum vendor-specific sub- attributes.

3.3.1. Agent-Circuit-Id

Description This Attribute contains information describing the subscriber agent circuit identifier corresponding to the logical access loop port of the Access Node/DSLAM from which a subscriber's requests are initiated. It MAY be present in both Access-Request and Accounting-Request packets. A summary of the Agent-Circuit-Id Attribute format is shown below. The fields are transmitted from left to right.
Top   ToC   RFC4679 - Page 7
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |           String...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      1 for Agent-Circuit-Id

   Vendor-Length

      <= 65

   String

      The String field contains information about the Access-Node to
      which the subscriber is attached, along with an identifier for the
      subscriber's DSL port on that Access-Node.

      The exact syntax of the string is implementation dependent;
      however, a typical practice is to subdivide it into two or more
      space-separated components, one to identify the Access-Node and
      another the subscriber line on that node, with perhaps an
      indication of whether that line is Ethernet or ATM.  Example
      formats for this string are shown below.

      "Access-Node-Identifier atm slot/port:vpi.vci"
         (when ATM/DSL is used)

      "Access-Node-Identifier eth slot/port[:vlan-id]"
         (when Ethernet/DSL is used)

      An example showing the slot and port field encoding is given
      below:

      "[Relay-identifier] atm 3/0:100.33"
         (slot = 3, port = 0, vpi = 100, vci = 33)

      The Access-Node-Identifier is a unique ASCII string that does not
      include 'space' characters.  The syntax of the slot and port
      fields reflects typical practices currently in place.  The slot
      identifier does not exceed 6 characters in length, and the port
      identifier does not exceed 3 characters in length using a '\' as a
      delimiter.
Top   ToC   RFC4679 - Page 8
      The exact manner in which slots are identified is Access
      Node/DSLAM implementation dependent.  The vpi, vci, and vlan-id
      fields (when applicable) are related to a given access loop
      (U-interface).

3.3.2. Agent-Remote-Id

Description The Agent-Remote-Id Attribute contains an operator-specific, statically configured string that uniquely identifies the subscriber on the associated access loop of the Access Node/DSLAM. In a typical subscriber environment, multiple attributes can be used to identify the user, among others: Username (for example, as defined on a PPP client); Agent-Circuit-Id (a static, pre-defined string sent from the Access Node/DSLAM); Agent-Remote-Id (an operator-defined string configured on and sent by the Access Node/DSLAM). This Attribute MAY be included in both Access-Request and Accounting-Request packets. A summary of the Agent-Remote-Id Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | String... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 2 for Agent-Remote-Id Vendor-Length <= 65 String This value of this field is entirely open to the service provider's discretion. For example, it MAY contain a subscriber billing identifier or telephone number.
Top   ToC   RFC4679 - Page 9

3.3.3. Actual-Data-Rate-Upstream

Description This Attribute contains the actual upstream train rate of a subscriber's synchronized DSL link. It MAY be included in both Access-Request and Accounting-Request packets. A summary of the Actual-Data-Rate-Upstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 129 (0x81) for Actual-Data-Rate-Upstream Vendor-Length 6 Value This field contains a 4-byte unsigned integer, indicating the subscriber's actual data rate upstream of a synchronized DSL link. The rate is coded in bits per second.

3.3.4. Actual-Data-Rate-Downstream

Description This Attribute contains the actual downstream train rate of a subscriber's synchronized DSL link. It MAY be included in both Access-Request and Accounting-Request packets. A summary of the Actual-Data-Rate-Downstream Attribute format is shown below. The fields are transmitted from left to right.
Top   ToC   RFC4679 - Page 10
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |            Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont'd.)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      130 (0x82) for Actual-Data-Rate-Downstream

   Vendor-Length

      6

   Value

      This field contains a 4-byte unsigned integer, indicating the
      subscriber's actual data rate downstream of a synchronized DSL
      link.  The rate is coded in bits per second.

3.3.5. Minimum-Data-Rate-Upstream

Description This Attribute contains the subscriber's operator-configured minimum upstream data rate. It MAY be included in Accounting- Request packets. A summary of the Minimum-Data-Rate-Upstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 131 (0x83) for Minimum-Data-Rate-Upstream Vendor-Length 6
Top   ToC   RFC4679 - Page 11
   Value

      This field contains a 4-byte unsigned integer, indicating the
      subscriber's minimum upstream data rate (as configured by the
      operator).  The rate is coded in bits per second.

3.3.6. Minimum-Data-Rate-Downstream

Description This Attribute contains the subscriber's operator-configured minimum downstream data rate. It MAY be included in Accounting- Request packets. A summary of the Minimum-Data-Rate-Downstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 132 (0x84) for Minimum-Data-Rate-Downstream Vendor-Length 6 Value This field contains a 4-byte unsigned integer, indicating the subscriber's minimum downstream data rate (as configured by the operator). The rate is coded in bits per second.

3.3.7. Attainable-Data-Rate-Upstream

Description This Attribute contains the subscriber's attainable upstream data rate. It MAY be included in Accounting-Request packets. A summary of the Attainable-Data-Rate-Upstream Attribute format is shown below. The fields are transmitted from left to right.
Top   ToC   RFC4679 - Page 12
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |            Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont'd.)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      133 (0x85) for Attainable-Data-Rate-Upstream

   Vendor-Length

      6

   Value

      This field contains a 4-byte unsigned integer, indicating the
      subscriber's actual DSL attainable upstream data rate.  The rate
      is coded in bits per second.

3.3.8. Attainable-Data-Rate-Downstream

Description This Attribute contains the subscriber's attainable downstream data rate. It MAY be included in Accounting-Request packets. A summary of the Attainable-Data-Rate-Downstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 134 (0x86) for Attainable-Data-Rate-Downstream Vendor-Length 6
Top   ToC   RFC4679 - Page 13
   Value

      This field contains a 4-byte unsigned integer, indicating the
      subscriber's actual DSL attainable downstream data rate.  The rate
      is coded in bits per second.

3.3.9. Maximum-Data-Rate-Upstream

Description This Attribute contains the subscriber's maximum upstream data rate, as configured by the operator. It MAY be included in Accounting-Request packets. A summary of the Maximum-Data-Rate-Upstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 135 (0x87) for Maximum-Data-Rate-Upstream Vendor-Length 6 Value This field is a 4-byte unsigned integer, indicating the numeric value of the subscriber's DSL maximum upstream data rate. The rate is coded in bits per second.

3.3.10. Maximum-Data-Rate-Downstream

Description This Attribute contains the subscriber's maximum downstream data rate, as configured by the operator. It MAY be included in Accounting-Request packets.
Top   ToC   RFC4679 - Page 14
   A summary of the Maximum-Data-Rate-Downstream Attribute format is
   shown below.  The fields are transmitted from left to right.

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |            Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont'd.)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      136 (0x88) for Maximum-Data-Rate-Downstream

   Vendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value of the subscriber's DSL maximum downstream data rate.  The
      rate is coded in bits per second.

3.3.11. Minimum-Data-Rate-Upstream-Low-Power

Description This Attribute contains the subscriber's minimum upstream data rate in low power state, as configured by the operator. It MAY be included in Accounting-Request packets. A summary of the Minimum-Data-Rate-Upstream-Low-Power Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 137 (0x89) for Minimum-Data-Rate-Upstream-Low-Power
Top   ToC   RFC4679 - Page 15
   Vendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value of the subscriber's DSL minimum upstream data rate when in
      low power state (L1/L2).  The rate is coded in bits per second.

3.3.12. Minimum-Data-Rate-Downstream-Low-Power

Description This Attribute contains the subscriber's minimum downstream data rate in low power state, as configured by the operator. It MAY be included in Accounting-Request packets. A summary of the Minimum-Data-Rate-Downstream-Low-Power Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 138 (0x8A) for Minimum-Data-Rate-Downstream-Low-Power Vendor-Length 6 Value This field is a 4-byte unsigned integer, indicating the numeric value of the subscriber's DSL minimum downstream data rate. The rate is coded in bits per second.
Top   ToC   RFC4679 - Page 16

3.3.13. Maximum-Interleaving-Delay-Upstream

Description This Attribute contains the subscriber's maximum one-way upstream interleaving delay, as configured by the operator. It MAY be included in Accounting-Request packets. A summary of the Maximum-Interleaving-Delay-Upstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 139 (0x8B) for Maximum-Interleaving-Delay-Upstream Vendor-Length 6 Value This field is a 4-byte unsigned integer, indicating the numeric value in milliseconds of the subscriber's DSL maximum one-way upstream interleaving delay.

3.3.14. Actual-Interleaving-Delay-Upstream

Description This Attribute contains the subscriber's actual one-way upstream interleaving delay. It MAY be included in Accounting-Request packets. A summary of the Actual-Interleaving-Delay-Upstream Attribute format is shown below. The fields are transmitted from left to right.
Top   ToC   RFC4679 - Page 17
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Vendor-Type  | Vendor-Length |            Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont'd.)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Vendor-Type

      140 (0x8C) for Actual-Interleaving-Delay-Upstream

   Vendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value in milliseconds of the subscriber's DSL actual upstream
      interleaving delay.

3.3.15. Maximum-Interleaving-Delay-Downstream

Description This Attribute contains the subscriber's maximum one-way downstream interleaving delay, as configured by the operator. It MAY be included in Accounting-Request packets. A summary of the Maximum-Interleaving-Delay-Downstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 141 (0x8D) for Maximum-Interleaving-Delay-Downstream
Top   ToC   RFC4679 - Page 18
   Vendor-Length

      6

   Value

      This field is a 4-byte unsigned integer, indicating the numeric
      value in milliseconds of the subscriber's DSL maximum one-way
      downstream interleaving delay.

3.3.16. Actual-Interleaving-Delay-Downstream

Description This Attribute contains the subscriber's actual one-way downstream interleaving delay. It MAY be included in Accounting-Request packets. A summary of the Actual-Interleaving-Delay-Downstream Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 142 (0x8E) for Actual-Interleaving-Delay-Downstream Vendor-Length 6 Value This field is a 4-byte unsigned integer, indicating the numeric value in milliseconds of the subscriber's DSL actual downstream interleaving delay.
Top   ToC   RFC4679 - Page 19

3.3.17. Access-Loop-Encapsulation

Description This Attribute describes the encapsulation(s) used by the subscriber on the DSL access loop. It MAY be present in both Access-Request and Accounting-Request packets. A summary of the Access-Loop-Encapsulation Attribute format is shown below. The fields are transmitted from left to right. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | Value +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Value (cont'd) | +-+-+-+-+-+-+-+-+ Vendor-Type 144 (0x90) for Access-Loop-Encapsulation Vendor-Length 5 Value This field is a string 3 bytes in length, logically divided into three 1-byte sub-fields as shown in the following diagram: 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Data Link | Encaps 1 | Encaps 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Valid values for the sub-fields are as follows: Data Link 0x01 AAL5 0x02 Ethernet
Top   ToC   RFC4679 - Page 20
      Encaps 1

         0x00 NA - Not Available
         0x01 Untagged Ethernet
         0x02 Single-Tagged Ethernet

      Encaps 2

         0x00 NA - Not Available
         0x01 PPPoA LLC
         0x02 PPPoA Null
         0x03 IPoA LLC
         0x04 IPoA Null
         0x05 Ethernet over AAL5 LLC with FCS
         0x06 Ethernet over AAL5 LLC without FCS
         0x07 Ethernet over AAL5 Null with FCS
         0x08 Ethernet over AAL5 Null without FCS

3.3.18. IWF-Session

Description The presence of this Attribute indicates that the IWF has been performed with respect to the subscriber's session; note that no data field is necessary. It MAY be included in both Access- Request and Accounting-Request packets. A summary of the IWF-Session Attribute format is shown below. The fields are transmitted from left to right. 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vendor-Type | Vendor-Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor-Type 254 (0xFE) for IWF-Session Vendor-Length 2
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4. Table of Attributes

The following table provides a guide to which attributes may be found in which kinds of packets, and in what quantity; note that since none of the DSL Forum VSAs may be present in the Access-Accept, Access- Reject or Access-Challenge packets, those columns have been omitted from the table. Request Acct-Request # Attribute 0-1 0-1 1 Agent-Circuit-Id 0-1 0-1 2 Agent-Remote-Id 0-1 0-1 129 Actual-Data-Rate-Upstream 0-1 0-1 130 Actual-Data-Rate-Downstream 0 0-1 131 Minimum-Data-Rate-Upstream 0 0-1 132 Minimum-Data-Rate-Downstream 0 0-1 133 Attainable-Data-Rate-Upstream 0 0-1 134 Attainable-Data-Rate-Downstream 0 0-1 135 Maximum-Data-Rate-Upstream 0 0-1 136 Maximum-Data-Rate-Downstream 0 0-1 137 Minimum-Data-Rate-Upstream-Low-Power 0 0-1 138 Minimum-Data-Rate-Downstream-Low-Power 0 0-1 139 Maximum-Interleaving-Delay-Upstream 0 0-1 140 Actual-Interleaving-Delay-Upstream 0 0-1 141 Maximum-Interleaving-Delay-Downstream 0 0-1 142 Actual-Interleaving-Delay-Downstream 0-1 0-1 144 Access-Loop-Encapsulation 0-1 0-1 254 IWF-Session The following table defines the meaning of the above table entries. 0 This Attribute MUST NOT be present in packet. 0-1 Zero or one instances of this Attribute MAY be present in packet.

5. Security Considerations

The security of these Attributes relies on an implied trust relationship between the Access Node/DSLAM and the BRAS. The identifiers that are inserted by the Access Node/DSLAM are unconditionally trusted; the BRAS does not perform any validity check on the information received. These Attributes are intended to be used in environments in which the network infrastructure (the Access Node/DSLAM, the BRAS, and the entire network in which those two devices reside) is trusted and secure.
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   As used in this document, the word "trusted" implies that
   unauthorized traffic cannot enter the network except through secured
   and trusted devices and that all devices internal to the network are
   secure and trusted.  Careful consideration should be given to the
   potential security vulnerabilities that are present in this model
   before deploying this option in actual networks.

   The Attributes described in this document neither increase nor
   decrease the security of the RADIUS protocol.  For discussions of
   various RADIUS vulnerabilities, see [RFC2607], [RFC3579], [RFC3162],
   and [RFC3580].

6. References

6.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson, "Remote Authentication Dial In User Service (RADIUS)", RFC 2865, June 2000. [RFC2866] Rigney, C., "RADIUS Accounting", RFC 2866, June 2000.

6.2. Informative References

[IANA] Internet Assigned Numbers Authority, "PRIVATE ENTERPRISE NUMBERS", January 2006, <http://www.iana.org/assignments/enterprise-numbers>. [ITU.I363-5.1996] International Telecommunications Union, "B-ISDN ATM Adaptation Layer Specification: Type 5 AAL", ITU-T Recommendation I.363.5, August 1996. [RFC2516] Mamakos, L., Lidl, K., Evarts, J., Carrel, D., Simone, D., and R. Wheeler, "A Method for Transmitting PPP Over Ethernet (PPPoE)", RFC 2516, February 1999. [RFC2607] Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy Implementation in Roaming", RFC 2607, June 1999. [RFC3046] Patrick, M., "DHCP Relay Agent Information Option", RFC 3046, January 2001. [RFC3162] Aboba, B., Zorn, G., and D. Mitton, "RADIUS and IPv6", RFC 3162, August 2001.
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   [RFC3579]  Aboba, B. and P. Calhoun, "RADIUS (Remote Authentication
              Dial In User Service) Support For Extensible
              Authentication Protocol (EAP)", RFC 3579, September 2003.

   [RFC3580]  Congdon, P., Aboba, B., Smith, A., Zorn, G., and J. Roese,
              "IEEE 802.1X Remote Authentication Dial In User Service
              (RADIUS) Usage Guidelines", RFC 3580, September 2003.

   [RFC4243]  Stapp, M., Johnson, R., and T. Palaniappan, "Vendor-
              Specific Information Suboption for the Dynamic Host
              Configuration Protocol (DHCP) Relay Agent Option",
              RFC 4243, December 2005.
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Authors' Addresses

Vince Mammoliti Cisco Systems 181 Bay Street, Suite 3400 Toronto, ON M5J 2T3 Canada EMail: vince@cisco.com Glen Zorn Cisco Systems 2901 Third Avenue, Suite 600 SEA1/5/ Seattle, WA 98121 USA Phone: +1 (425) 344 8113 EMail: gwz@cisco.com Peter Arberg Redback Networks, Inc. 300 Holger Way San Jose, CA 95134 USA EMail: parberg@redback.com Robert Rennison ECI Telecom Omega Corporate Center 1300 Omega Drive Pittsburgh, PA 15205 USA EMail: robert.rennison@ecitele.com
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