Mobile IP Vendor/Organization-Specific Extensions
RFC 3115

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Network Working Group                                         G. Dommety
Request for Comments: 3115                                      K. Leung
Obsoletes: 3025                                            cisco Systems
Category: Standards Track                                     April 2001

           Mobile IP Vendor/Organization-Specific Extensions

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

RFC Editor Note:

   This memo corrects discrepancies between the values assigned for
   CVSE-TYPE-NUMBER and NVSE-TYPE-NUMBER in RFC 3025 and in the Internet
   Assigned Numbers Authority's (IANA) repository.  The difference in
   the assigned values are as follows:

   CVSE-TYPE-NUMBER = 37 in RFC 3025
   CVSE-TYPE-NUMBER = 38 in IANA (Under Mobile IP numbers)

   NVSE-TYPE-NUMBER =  133 in RFC 3025
   NVSE-TYPE-NUMBER =  134 in IANA (Under Mobile IP numbers)

   This memo obsoletes RFC 3025, since the current implementations
   follow the IANA assignments.

Abstract

   This document defines two new extensions to Mobile IP.  These
   extensions will facilitate equipment vendors and organizations to
   make specific use of these extensions as they see fit for research or
   deployment purposes.

Dommety & Leung             Standards Track                     [Page 1]
RFC 3115          Mobile IP Vendor Specific Extensions        April 2001

1. Introduction

   Current specification of Mobile IP [1] does not allow for
   organizations and vendors to include organization/vendor-specific
   information in the Mobile IP messages.  With the imminent wide scale
   deployment of Mobile IP it is useful to have vendor or organization-
   Specific Extensions to support this capability.  This document
   defines two extensions that can be used for making organization
   specific extensions by vendors/organizations for their own specific
   purposes.

1.1. Specification Language

   The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [3].

   In addition, the following words are used to signify the requirements
   of the specification.

   silently discard
            The implementation discards the datagram without further
            processing, and without indicating an error to the sender.
            The implementation SHOULD provide the capability of logging
            the error, including the contents of the discarded datagram,
            and SHOULD record the event in a statistics counter.

2. Vendor/Organization Specific Extensions

   Two Vendor/Organization Specific Extensions are described, Critical
   (CVSE) and Normal (NVSE) Vendor/Organization Specific Extensions.
   The basic differences between the Critical and Normal Extensions are
   that when the Critical extension is encountered but not recognized,
   the message containing the extension MUST be silently discarded,
   whereas when a Normal Vendor/Organization Specific Extension is
   encountered but not recognized, the extension SHOULD be ignored, but
   the rest of the Extensions and message data MUST still be processed.
   Another difference between the two is that Critical
   Vendor/Organization Extension has a length field of two octets and
   the NVSE has a length field of only one octet.

Dommety & Leung             Standards Track                     [Page 2]
RFC 3115          Mobile IP Vendor Specific Extensions        April 2001

2.1. Critical Vendor/Organization Specific Extension (CVSE)

   The format of this extension is as shown 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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |   Reserved    |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Vendor/Org-ID                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          Vendor-CVSE-Type     |    Vendor-CVSE-Value ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

         Figure 1: Critical Vendor/Organization Specific Extension

   Type       CVSE-TYPE-NUMBER 38

   Reserved   Reserved for future use.  MUST be set to 0 on sending,
              MUST be ignored on reception.

   Length     Length in bytes of this extension, not including the Type
              and Length bytes.

   Vendor/Org-ID