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Versions: 00 01 02 03 04 05 06 RFC 4675

Network Working Group                                       Paul Congdon
INTERNET-DRAFT                                          Mauricio Sanchez
Category: Proposed Standard                      Hewlett-Packard Company
<draft-ietf-radext-vlan-06.txt>                            Bernard Aboba
11 June 2006                                       Microsoft Corporation


         RADIUS Attributes for Virtual LAN and Priority Support

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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   Drafts.

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   The list of current Internet-Drafts can be accessed at
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   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on December 10, 2006.

Copyright Notice

   Copyright (C) The Internet Society 2006.

Abstract

   This document proposes additional RADIUS (Remote Authentication Dial
   In User Service) attributes for dynamic Virtual LAN assignment and
   prioritization, for use in provisioning of access to IEEE 802 local
   area networks.  These attributes are usable within either RADIUS or
   Diameter.








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Table of Contents

1.     Introduction ..........................................    3
   1.1       Terminology .....................................    3
   1.2       Requirements Language ...........................    3
   1.3       Attribute Interpretation ........................    3
2.     Attributes ............................................    4
   2.1       Egress-VLANID ...................................    4
   2.2       Ingress-Filters .................................    5
   2.3       Egress-VLAN-Name ................................    6
   2.4       User-Priority-Table .............................    8
3.     Table of Attributes ...................................    9
4.     Diameter Considerations ...............................   10
5.     IANA Considerations ...................................   10
6.     Security Considerations ...............................   11
7.     References ............................................   12
   7.1       Normative References ............................   12
   7.2       Informative References ..........................   12
ACKNOWLEDGMENTS ..............................................   13
AUTHORS' ADDRESSES ...........................................   13
Intellectual Property Statement...............................   14
Disclaimer of Validity........................................   14
Full Copyright Statement .....................................   14




























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1.  Introduction

   This document describes Virtual LAN (VLAN) and re-prioritization
   attributes that may prove useful for provisioning of access to IEEE
   802 local area networks [IEEE-802] with the Remote Authentication
   Dialin User Service (RADIUS) or Diameter.

   While [RFC3580] enables support for VLAN assignment based on the
   tunnel attributes defined in [RFC2868], it does not provide support
   for a more complete set of VLAN functionality as defined by
   [IEEE-802.1Q].  The attributes defined in this document provide
   support within RADIUS and Diameter analogous to the management
   variables supported in [IEEE-802.1Q] and MIB objects defined in
   [RFC4363].  In addition, this document enables support for a wider
   range of [IEEE-802.1X] configurations.

1.1.  Terminology

   This document uses the following terms:

Network Access Server (NAS)
     A device that provides an access service for a user to a network.
     Also known as a RADIUS client.

RADIUS server
     A RADIUS authentication server is an entity that provides an
     authentication service to a NAS.

RADIUS proxy
     A RADIUS proxy acts as an authentication server to the NAS, and a
     RADIUS client to the RADIUS server.

1.2.  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].

1.3.  Attribute Interpretation

   The attributes described in this document apply to a single instance
   of a NAS port, or more specifically an IEEE 802.1Q bridge port.
   [IEEE-802.1Q] [IEEE-802.1D] and [IEEE-802.1X] do not recognize finer
   management granularity than "per port".  In some cases, such as with
   IEEE 802.11 wireless LANs, the concept of a "virtual port" is used in
   place of the physical port.  Such virtual ports are typically based
   on security associations and scoped by station, or MAC address.




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   The attributes defined in this document are applied on per user basis
   and it is expected that there is a single user per port; however in
   some cases that port may be a "virtual port".  If a NAS
   implementation conforming to this document supports "virtual ports",
   it may be possible to provision those "virtual ports" with unique
   values of the attributes described in this document, allowing
   multiple users sharing the same physical port to each have a unique
   set of authorization parameters.

   If a NAS conforming to this specification receives an Access-Accept
   packet containing an attribute defined in this document which it
   cannot apply, it MUST act as though it had received an Access-Reject.
   [RFC3576] requires that a NAS receiving a  Change of Authorization
   Request (CoA-Request) reply with a CoA-NAK if the Request contains an
   unsupported attribute.  It is recommended that an Error-Cause
   attribute with value set to "Unsupported Attribute" (401) be included
   in the CoA-NAK.  As noted in [RFC3576], authorization changes are
   atomic so that this situation does not result in session termination
   and the pre-existing configuration remains unchanged.  As a result,
   no accounting packets should be generated.

2.  Attributes

2.1.  Egress-VLANID

   Description

      The Egress-VLANID attribute represents an allowed IEEE 802 Egress
      VLANID for this port, indicating if the VLANID is allowed for
      tagged or untagged frames as well as the VLANID.

      As defined in [RFC3580], the VLAN assigned via tunnel attributes
      applies both to the ingress VLANID for untagged packets (known as
      the PVID) and the egress VLANID for untagged packets.  In
      contrast, the Egress-VLANID attribute configures only the egress
      VLANID for either tagged or untagged packets.  The Egress-VLANID
      attribute MAY be included in the same RADIUS packet as [RFC3580]
      tunnel attributes; however, the Egress-VLANID attribute is not
      necessary if it is being used to configure the same untagged
      VLANID included in tunnel attributes.  To configure an untagged
      VLAN for both ingress and egress, the tunnel attrubutes of
      [RFC3580] MUST be used.

      Multiple Egress-VLANID attributes MAY be included in Access-
      Request, Access-Accept, CoA-Request or Accounting-Request packets;
      this attribute MUST NOT be sent within an Access-Challenge,
      Access-Reject, Disconnect-Request, Disconnect-ACK, Disconnect-NAK,
      CoA-ACK or CoA-NAK.  Each attribute adds the specified VLAN to the



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      list of allowed egress VLANs for the port.

      The Egress-VLANID attribute 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     |            Value
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont)            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      TBD

   Length

      6

   Value

      The Value field is four octets.  The format is described below:

       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Tag Indic.   |        Pad            |       VLANID          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      The Tag Indication field is one octet in length, and indicates
      whether the frames on the VLAN are tagged (0x31) or untagged
      (0x32).  The Pad field is 12-bits in length and MUST be 0 (zero).
      The VLANID is 12-bits in length and contains the [IEEE-802.1Q]
      VLAN VID value.

2.2.  Ingress-Filters

   Description

      The Ingress-Filters attribute corresponds to the Ingress Filter
      per-port variable defined in [IEEE-802.1Q] clause 8.4.5.  When the
      attribute has the value "Enabled", the set of VLANs that are
      allowed to ingress a port must match the set of VLANs that are
      allowed to egress a port.  Only a single Ingress-Filters attribute
      MAY be sent within an Access-Request, Access-Accept, CoA-Request
      or Accounting-Request packet; this attribute MUST NOT be sent



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      within an Access-Challenge, Access-Reject, Disconnect-Request,
      Disconnect-ACK, Disconnect-NAK, CoA-ACK or CoA-NAK.

      The Ingress-Filters attribute 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     |         Value
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont)            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      TBD

   Length

      6

   Value

      The Value field is four octets.  Supported values include:

      1 - Enabled
      2 - Disabled

2.3.  Egress-VLAN-Name

   Description

      Clause 12.10.2.1.3 (a) in [IEEE-8021.Q] describes the
      administratively assigned VLAN Name associated with a VLAN-ID
      defined within an IEEE 802.1Q bridge. The Egress-VLAN-Name
      attribute represents an allowed VLAN for this port.  It is similar
      to the Egress-VLANID attribute, except that the VLAN-ID itself is
      not specified or known; rather the VLAN name is used to identify
      the VLAN within the system.

      The tunnel attributes described in [RFC3580] and the Egress-VLAN-
      Name attribute both can be used to configure the egress VLAN for
      untagged packets.  These attributes can be used concurrently and
      MAY appear in the same RADIUS packet.  When they do appear
      concurrently, the list of allowed VLANs is the concatenation of
      the Egress-VLAN-Name and the Tunnel-Private-Group-ID (81)
      attributes.  The Egress-VLAN-Name attribute does not alter the



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      ingress VLAN for untagged traffic on a port (also known as the
      PVID).  The tunnel attributes from [RFC3580] should be relied upon
      instead to set the PVID.

      The Egress-VLAN-Name attribute contains two parts; the first part
      indicates if frames on the VLAN for this port are to be
      represented in tagged or untagged format, the second part is the
      VLAN name.

      Multiple Egress-VLAN-Name attributes MAY be included within an
      Access-Request, Access-Accept, CoA-Request or Accounting-Request
      packet; this attribute MUST NOT be sent within an Access-
      Challenge, Access-Reject, Disconnect-Request, Disconnect-ACK,
      Disconnect-NAK, CoA-ACK or CoA-NAK.  Each attribute adds the named
      VLAN to the list of allowed egress VLANs for the port.  The
      Egress-VLAN-Name attribute 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     |   Tag Indic.  |   String...
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Type

      TBD

   Length

      >=4

   Tag Indication

      The Tag Indication field is one octet in length, and indicates
      whether the frames on the VLAN are tagged (0x31, ASCII '1') or
      untagged (0x32, ASCII '2').  These values were chosen so as to
      make them easier for users to enter.

   String

      The String field is at least one octet in length, and contains the
      the VLAN Name as defined in [IEEE-802.1Q] clause 12.10.2.1.3 (a).
      [RFC3629] UTF-8 encoded 10646 characters are RECOMMENDED, but a
      robust implementation SHOULD support the field as undistinguished
      octets.




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2.4.  User-Priority-Table

   Description

      [IEEE-802.1D] clause 7.5.1 discusses how to regenerate (or re-map)
      user priority on frames received at a port.  This per-port
      configuration enables a bridge to cause the priority of received
      traffic at a port to be mapped to a particular priority.
      [IEEE-802.1D] clause 6.3.9 describes the use of remapping:

         The ability to signal user priority in IEEE 802 LANs allows
         user priority to be carried with end-to-end significance across
         a Bridged Local Area Network.  This, coupled with a consistent
         approach to the mapping of user priority to traffic classes and
         of user priority to access_priority, allows consistent use of
         priority information, according to the capabilities of the
         Bridges and MACs in the transmission path...

         Under normal circumstances, user priority is not modified in
         transit through the relay function of a Bridge; however,
         network management can control how user priority is propagated.
         Table 7-1 provides the ability to map incoming user priority
         values on a per-Port basis.  By default, the regenerated user
         priority is identical to the incoming user priority.

      This attribute represents the IEEE 802 prioritization that will be
      applied to frames arriving at this port.  There are eight possible
      user priorities, according to the [IEEE-802] standard.
      [IEEE-802.1D] clause 14.6.2.3.3 specifies the regeneration table
      as 8 values, each an integer in the range 0-7.  The management
      variables are described in clause 14.6.2.2.

      A single User-Priority-Table attribute MAY be included in an
      Access-Accept or CoA-Request packet; this attribute MUST NOT be
      sent within an Access-Request, Access-Challenge, Access-Reject,
      Disconnect-Request, Disconnect-ACK, Disconnect-NAK, CoA-ACK, CoA-
      NAK or Accounting-Request.  Since the regeneration table is only
      maintained by a bridge conforming to [IEEE-802.1D], this attribute
      should only be sent to a RADIUS client supporting that
      specification.

      The User-Priority-Table attribute is shown below.  The fields are
      transmitted from left to right:








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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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |  Length       |          String
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                    String
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    String            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      TBD

   Length

      10

   String

      The String field is 8 octets in length, and includes a table which
      maps the incoming priority (if it is set - the default is 0) into
      one of eight regenerated priorities.  The first octet maps to
      incoming priority 0, the second octet to incoming priority 1, etc.
      The values in each octet represent the regenerated priority of the
      frame.

      It is thus possible to either remap incoming priorities to more
      appropriate values; to honor the incoming priorities; or to
      override any incoming priorities, forcing them to all map to a
      single chosen priority.

      The [IEEE-8021.D] specification, Annex G, provides a useful
      description of traffic type - traffic class mappings.

3.  Table of Attributes

   The following table provides a guide to which attributes may be found
   in which kinds of packets, and in what quantity.

   Access- Access- Access- Access-   CoA-  Acct-
   Request Accept  Reject  Challenge Req   Req   #   Attribute
    0+      0+      0       0        0+    0+   TBD  Egress-VLANID
    0-1     0-1     0       0        0-1   0-1  TBD  Ingress-Filters
    0+      0+      0       0        0+    0+   TBD  Egress-VLAN-Name
    0       0-1     0       0        0-1   0    TBD  User-Priority-Table

   The following table defines the meaning of the above table entries.



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     0     This attribute MUST NOT be present in the packet.
     0+    Zero or more instances of this attribute MAY be
           present in the packet.
     0-1   Zero or one instance of this attribute MAY be
           present in the packet.

4.  Diameter Considerations

   When used in Diameter, the attributes defined in this specification
   can be used as Diameter AVPs from the Code space 1-255 (RADIUS
   attribute compatibility space). No additional Diameter Code values
   are therefore allocated.  The data types and flag rules for the
   attributes are as follows:

                                  +---------------------+
                                  |    AVP Flag rules   |
                                  |----+-----+----+-----|----+
                                  |    |     |SHLD| MUST|    |
   Attribute Name      Value Type |MUST| MAY | NOT|  NOT|Encr|
   -------------------------------|----+-----+----+-----|----|
   Egress-VLANID       OctetString| M  |  P  |    |  V  | Y  |
   Ingress-Filters     Enumerated | M  |  P  |    |  V  | Y  |
   Egress-VLAN-Name    UTF8String | M  |  P  |    |  V  | Y  |
   User-Priority-Table OctetString| M  |  P  |    |  V  | Y  |
   -------------------------------|----+-----+----+-----|----|

   The attributes in this specification have no special translation
   requirements for Diameter to RADIUS or RADIUS to Diameter gateways;
   they are copied as is, except for changes relating to headers,
   alignment, and padding. See also [RFC 3588] Section 4.1 and [RFC
   4005] Section 9.

   What this specification says about the applicability of the
   attributes for RADIUS Access-Request packets applies in Diameter to
   AA-Request [RFC 4005] or Diameter-EAP-Request [RFC 4072].  What is
   said about Access-Challenge applies in Diameter to AA-Answer [RFC
   4005] or Diameter-EAP-Answer [RFC 4072] with Result-Code AVP set to
   DIAMETER_MULTI_ROUND_AUTH.

   What is said about Access-Accept applies in Diameter to AA-Answer or
   Diameter-EAP-Answer messages that indicate success.  Similarly, what
   is said about RADIUS Access-Reject packets applies in Diameter to AA-
   Answer or Diameter-EAP-Answer messages that indicate failure.

   What is said about COA-Request applies in Diameter to Re-Auth-Request
   [RFC 4005].

   What is said about Accounting-Request applies to Diameter Accounting-



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   Request [RFC 4005] as well.

5.  IANA Considerations

   This specification does not create any new registries.

   This document uses the RADIUS [RFC2865] namespace, see
   <http://www.iana.org/assignments/radius-types>.  Allocation of four
   updates for the section "RADIUS Attribute Types" is requested. The
   RADIUS attributes for which values are requested are:

   TBD - Egress-VLANID
   TBD - Ingress-Filters
   TBD - Egress-VLAN-Name
   TBD - User-Priority-Table

6.  Security Considerations

   This specification describes the use of RADIUS and Diameter for
   purposes of authentication, authorization and accounting in IEEE 802
   local area networks.  RADIUS threats and security issues for this
   application are described in [RFC3579] and [RFC3580]; security issues
   encountered in roaming are described in [RFC2607].  For Diameter, the
   security issues relating to this application are described in
   [RFC4005] and [RFC4072].

   This document specifies new attributes that can be included in
   existing RADIUS packets, which are protected as described in
   [RFC3579] and [RFC3576].  In Diameter, the attributes are protected
   as specified in [RFC3588]. See those documents for a more detailed
   description.

   The security mechanisms supported in RADIUS and Diameter are focused
   on preventing an attacker from spoofing packets or modifying packets
   in transit.  They do not prevent an authorized RADIUS/Diameter server
   or proxy from inserting attributes with malicious intent.

   VLAN attributes sent by a RADIUS/Diameter server or proxy may enable
   access to unauthorized VLANs.  These vulnerabilities can be limited
   by performing authorization checks at the NAS.  For example, a NAS
   can be configured to accept only certain VLANIDs from a given
   RADIUS/Diameter server/proxy.

   Similarly, an attacker gaining control of a RADIUS/Diameter server or
   proxy can modify the user priority table, causing either degradation
   of quality of service (by downgrading user priority of frames
   arriving at a port), or denial of service (by raising the level of
   priority of traffic at multiple ports of a device, oversubscribing



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   the switch or link capabilities).

7.  References

7.1.  Normative references

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
          Requirement Levels", RFC 2119, March, 1997.

[RFC2865] Rigney, C., Rubens, A., Simpson, W. and S. Willens, "Remote
          Authentication Dial In User Service (RADIUS)", RFC 2865, June
          2000.

[RFC3588] Calhoun, P., Loughney, J., Guttman, E., Zorn, G. and J. Arkko,
          "Diameter Base Protocol", RFC 3588, September 2003.

[RFC3629] Yergeau, F., "UTF-8, a transformation of ISO 10646", RFC 3629,
          November 2003.

[RFC4363] Levi, D. and D. Harrington, "Definitions of Managed Objects
          for Bridges with Traffic Classes, Multicast Filtering and
          Virtual LAN Extensions", RFC 4363, January 2006.

[IEEE-802]
          IEEE Standards for Local and Metropolitan Area Networks:
          Overview and Architecture, ANSI/IEEE Std 802, 1990.

[IEEE-802.1D]
          IEEE Standards for Local and Metropolitan Area Networks: Media
          Access Control (MAC) Bridges, IEEE Std 802.1D-2004, June 2004.

[IEEE-802.1Q]
          IEEE Standards for Local and Metropolitan Area Networks: Draft
          Standard for Virtual Bridged Local Area Networks,
          P802.1Q-2003, January 2003.

7.2.  Informative references

[IEEE-802.1X]
          IEEE Standards for Local and Metropolitan Area Networks: Port
          based Network Access Control, IEEE Std 802.1X-2004,  December
          2004.

[RFC2607] Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy
          Implementation in Roaming", RFC 2607, June 1999.

[RFC2868] Zorn, G., Leifer, D., Rubens, A., Shriver, J., Holdrege, M.
          and I. Goyret, "RADIUS Attributes for Tunnel Protocol



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          Support", RFC 2868, June 2000.

[RFC3576] Chiba, M., Dommety, G., Eklund, M., Mitton, D. and B.  Aboba,
          "Dynamic Authorization Extensions to Remote Authentication
          Dial In User Service (RADIUS)", RFC 3576, July 2003.

[RFC3579] Aboba, B. and P. Calhoun, "RADIUS Support for Extensible
          Authentication Protocol (EAP)", RFC 3579, September 2003.

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

[RFC4005] Calhoun, P., Zorn, G., Spence, D. and D. Mitton, "Diameter
          Network Access Server Application", RFC 4005, August 2005.

[RFC4072] Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
          Authentication Protocol (EAP) Application", RFC 4072, August
          2005.

Acknowledgments

   The authors would like to acknowledge Joseph Salowey of Cisco, David
   Nelson of Enterasys, Chuck Black of Hewlett Packard, and Ashwin
   Palekar of Microsoft.

Authors' Addresses

   Paul Congdon
   Hewlett Packard Company
   HP ProCurve Networking
   8000 Foothills Blvd, M/S 5662
   Roseville, CA  95747

   EMail: paul.congdon@hp.com
   Phone: +1 916 785 5753
   Fax:   +1 916 785 8478

   Mauricio Sanchez
   Hewlett Packard Company
   HP ProCurve Networking
   8000 Foothills Blvd, M/S 5559
   Roseville, CA  95747

   EMail: mauricio.sanchez@hp.com
   Phone: +1 916 785 1910
   Fax:   +1 916 785 1815




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   Bernard Aboba
   Microsoft Corporation
   One Microsoft Way
   Redmond, WA 98052

   EMail: bernarda@microsoft.com
   Phone: +1 425 706 6605
   Fax:   +1 425 936 7329

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   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Copyright Statement

   Copyright (C) The Internet Society (2006).  This document is subject
   to the rights, licenses and restrictions contained in BCP 78, and
   except as set forth therein, the authors retain all their rights.



Congdon, et al.             Proposed Standard                  [Page 14]

INTERNET-DRAFT        VLAN and Priority Attributes          11 June 2006


Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.

Open issues

   Open issues relating to this specification are tracked on the
   following web site:

   http://www.drizzle.com/~aboba/RADEXT/








































Congdon, et al.             Proposed Standard                  [Page 15]


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