The Advisory Attribute

                                                       David Kessens
                ____________________________________________________




                               The Advisory Attribute



                                   David Kessens
                                      RIPE NCC

                                 Document: ripe-130

                               Obsoleted-by: ripe-131


    Scope

                This  document  describes  the advisory attribute of
                the route object.


    Description

                Some autonomous systems may  benefit  from  specific
                private  information  stored in the routing registry
                on a per route basis.  The advisory attribute of the
                route  object  enables  this.   It simply provides a
                mechanism by which the maintainer of a route  object
                can  register  an arbitrary text string intended for
                the operator of  a  specific  AS.   The  syntax  and
                semantics  of  the  text  string  are defined by the
                operator of the AS  concerned  and  are  beyond  the
                scope of this document.

                It  is recommended to limit the use of advisories as
                much as possible and to  use  the  standard  routing
                registry  instead.  It should be considered that the
                use of this attribute requires additional effort  by
                the  maintainers of the route objects concerned.  It
                is important to establish their motivation to regis-
                ter and maintain this information properly.


    Definition


                advisory:
                     Advises  a  specific  AS to use the information
                     that is defined in this attribute.


                     Format:
                          <ASnnnn> <AS specific information>
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                ripe-130.txt                                  Page 1
                                              The Advisory Attribute

                                                       David Kessens
                ____________________________________________________

                          The  AS  specific  information is intended
                          for use by ASnnnn only.  The syntax of the
                          AS  specific  information  is  defined  by
                          ASnnnn and beyond the scope of this  docu-
                          ment.   It  can  be obtained by contacting
                          the  administrative  contacts  of   ASnnnn
                          which  can  be  found in the corresponding
                          aut-num object.

                     Status: optional, multiple lines allowed


    Acknowledgements

                This document is based on a draft by Dale Johnson of
                MERIT.





































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                ripe-130.txt                                  Page 2