[lisp] Fwd: I-D Action:draft-iannone-lisp-mapping-versioning-00.txt

Hi All,

A new draft is available proposing a modification of the current lisp  
header format.

Comments are welcome.

Cheers

Luigi

Note: The draft is not meant to be considered for interoperability  
test concerning lisp implementation.
For that purpose the reference is still the original lisp draft (now  
at version 12).

Begin forwarded message:

> From: Internet-Drafts@ietf.org
> Date: March 3, 2009 7:15:02 PM GMT+01:00
> To: i-d-announce@ietf.org
> Subject: I-D Action:draft-iannone-lisp-mapping-versioning-00.txt
> Reply-To: internet-drafts@ietf.org
>
> A New Internet-Draft is available from the on-line Internet-Drafts  
> directories.
>
> 	Title           : LISP Mapping Versioning
> 	Author(s)       : L. Iannone, et al.
> 	Filename        : draft-iannone-lisp-mapping-versioning-00.txt
> 	Pages           : 22
> 	Date            : 2009-03-03
>
> The present document sketches an alternative approach to provide
> information about changes to EID-to-RLOC mappings in the context of
> LISP.  The proposed approach is based on a versioning system for the
> EID-to-RLOC mapping itself.  When there is a change in the mapping
> (where change could mean adding/removing an RLOC or just a
> modification in the priority or weight of one or more RLOCs) a new
> version number is generated and propagated in the LISP data packet.
> In the LISP context, ETRs do not keep state that allows to know when
> an ITR changes a mapping.  The versioning system is a data-driven
> mechanism to annonce those changes.
>
> In order to support such an approach, the LISP encapsulation need to
> be modified.  In particular LISP-encapsulated data packets have to
> contain the version number of the mapings used to select the RLOCs in
> the outer header.  These version numbers are contained in a "new"
> LISP header.
>
> The mappings are distributed as usual through the mapping
> distribution system (e.g., CONS, ALT); versioning is only a mean to
> announce that something has changed in the mapping.  The
> infrastructure built by each specific mapping protocol does not
> change anyhow.  Nevertheless, two modifications are needed.  The
> first modification consist in including version number in the Map-
> Reply messages.  The second modification consist in the introduction
> of a new message, the "Map-Update-Notification" message used by ETRs
> to notify ITRs that the mapping used to encapsulate the packet is old
> and needs to be updated.  This message does not contain the mapping,
> it just suggests ITRs to perform a Map-Request in order to retrieve
> the updated mapping.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-iannone-lisp-mapping-versioning-00.txt
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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> Internet-Draft.
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