RADIUS Extended Identifier Attribute
draft-chen-radext-identifier-attr-02

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Replaces draft-chen-radext-extended-header
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Network Working Group                                           E. Chen
Internet Draft                                                  N. Shen
Intended Status: Standards Track                          Cisco Systems
Expiration Date: April 21, 2018                        October 20, 2017

                  RADIUS Extended Identifier Attribute
                draft-chen-radext-identifier-attr-02.txt

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Chen & Shen                                                     [Page 1]

Internet Draft  draft-chen-radext-identifier-attr-02.txt    October 2017

Abstract

   The limitation with the one-octet "Identifier" field in the RADIUS
   packet is well known. In this document we propose extensions to the
   RADIUS protocol to address this fundamental limitation, and thus
   allowing for more efficient and more scalable implementations.

1. Introduction

   The "Identifier" field in the RADIUS packet [RFC2865] is used to
   match outstanding requests and replies.  As the field is one octet in
   size, only 256 requests can be in progress between two endpoints,
   which would present a significant bottleneck for performance.  The
   workaround for this limitation is to use multiple source ports as
   documented and discussed in [RFC2865], [RFC3539], and [RFC6613].

   Currently it is quite common to have hundreds of parallel connections
   between a RADIUS client and a server, especially in the deployment of
   controllers for wireless clients.  As the scale requirement continues
   to increase, the number of "parallel connections" is expected to grow
   (perhaps reaching thousands), which will undoubtedly create a number
   of challenges with resource utilization, efficiency, and connection
   management (with RADIUS over TCP [RFC6613] in particular) on both the
   client and the server.

   In this document we propose extensions to the RADIUS protocol to
   address this fundamental limitation and thus allowing for more
   efficient and more scalable implementations. More specifically, a new
   attribute ("Extended Identifier Attribute") is defined that can be
   used to discover the support of this specification between a client
   and a server using the Status-Server message [RFC5997].  Once the
   support is confirmed, the attribute can then be used to carry the
   extended identifier parameter in subsequent RADIUS packets. The
   extended identifier parameter can be used together with the
   Identifier to match outstanding requests and replies.

   For brevity the extensions specified in this document are referred to
   as "the Extended Identifier feature" hereafter.

1.1. Specification of Requirements

   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].

Chen & Shen                                                     [Page 2]

Internet Draft  draft-chen-radext-identifier-attr-02.txt    October 2017

2. Protocol Extensions

2.1. The Extended Identifier Attribute

   A new attribute, termed "Extended Identifier Attribute", is specified
   which can be used to discover the support for the Extended Identifier
   feature between a client and a server. It can also be used to carry
   the "extended identifier" parameter in a RADIUS packet after the
   support is confirmed.  The attribute number is TBD.  The value of the
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