RFC 3115 (rfc3115) - Page 2 of 9
Mobile IP Vendor/Organization-Specific Extensions
Alternative Format: Original Text Document
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