RFC 1397 (rfc1397) - Page 2 of 2

Default Route Advertisement In BGP2 and BGP3 Version of The Border Gateway Protocol

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RFC 1397               Default Routes in Old BGPs           January 1993


   gateway that can be used as a default next hop to destinations that
   are not listed in the BGP peer's routing table.  The value of the
   ORIGIN attribute should be 2 (INCOMPLETE).  The AS_PATH attribute
   should be constructed according to the same rules that apply to a
   conventional network advertisement.

   If multiple default routes are advertised by a BGP speaker,  the
   INTER-AS-METRIC path attribute can be included in the corresponding
   UPDATE messages to express  preference levels for entry points to the
   same AS.

   The UNREACHABLE path attribute is used to indicate that a previously
   advertised default route has become unreachable.

   UPDATE messages containing the default route advertisements should be
   handled according to the rules that apply to all other UPDATE
   messages.  If multiple default route are acquired by a BGP speaker, a
   route is selected according to the local policies adopted by this BGP
   speaker.

References

   [1] Lougheed, K., and Y. Rekhter, "A Border Gateway Protocol (BGP)",
       RFC 1163, cisco Systems, T.J. Watson Research Center, IBM Corp.,
       June 1990.

   [2] Lougheed, K., and Y. Rekhter, "A Border Gateway Protocol 3 (BGP-
       3)", RFC 1267, cisco Systems, T.J. Watson Research Center, IBM
       Corp., October 1991.

   [3] Rekhter, Y., and T. Li, "A Border Gateway Protocol 4 (BGP-4)",
       Work in Progress, T.J. Watson Research Center, IBM Corp., cisco
       Systems, December 1992.

Security Considerations

   Security issues are not discussed in this memo.

Author's Address

   Dimitry Haskin
   Bolt, Beranek & Newman
   150 Cambridge Park Drive
   Cambridge, MA 02140

   Phone: 617-873-8609
   Email: 




Haskin
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