RFC 3025 (rfc3025) - Page 2 of 8

Mobile IP Vendor/Organization-Specific Extensions

RFC 3025          Mobile IP Vendor Specific Extensions     February 2001


   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.

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 37

   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.







Dommety & Leung             Standards Track