RFC 2467 (rfc2467) - Page 2 of 9

Transmission of IPv6 Packets over FDDI Networks

RFC 2467                     IPv6 over FDDI                December 1998


   which specifies a smaller MTU, or by manual configuration of each
   node.  If a Router Advertisement received on an FDDI interface has an
   MTU option specifying an MTU larger than 4352, or larger than a
   manually configured value, that MTU option may be logged to system
   management but must be otherwise ignored.

   For purposes of this document, information received from DHCP is
   considered "manually configured" and the term FDDI includes CDDI.

3.  Frame Format

   FDDI provides both synchronous and asynchronous transmission, with
   the latter class further subdivided by the use of restricted and
   unrestricted tokens.  Only asynchronous transmission with
   unrestricted tokens is required for FDDI interoperability.
   Accordingly, IPv6 packets shall be sent in asynchronous frames using
   unrestricted tokens.  The robustness principle dictates that nodes
   should be able to receive synchronous frames and asynchronous frames
   sent using restricted tokens.

   IPv6 packets are transmitted in LLC/SNAP frames, using long-format
   (48 bit) addresses.  The data field contains the IPv6 header and
   payload and is followed by the FDDI Frame Check Sequence, Ending
   Delimiter, and Frame Status symbols.



























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