RFC 2546 (rfc2546) - Page 2 of 10

6Bone Routing Practice

RFC 2546                 6Bone Routing Practice               March 1999


   pTLA sites MUST use BGP4+ [RFC 2283] as the mandatory routing
   protocol for exchanging routing information among them.

   Multi-homed sites or pNLAs SHOULD also use BGP4+. Regular sites MAY
   use a simple default route to their ISP.

3.  Common Rules

   This section details common rules governing the routing on the 6Bone.
   They are derived from issues encountered on the 6Bone, with respect
   to the routes advertised, handling of special addresses, and
   aggregation:

    1) link local prefixes

    2) site local prefixes

    3) loopback prefix & unspecified prefix

    4) multicast prefixes

    5) IPv4-compatible prefixes

    6) IPv4-mapped prefixes

    7) default routes

    8) Yet undefined unicast prefixes (from a different /3 prefix)

    9) Inter site links issues

    10) aggregation & advertisement issues

3.1  Link-local prefix

   The link-local prefix (FE80::/10) MUST NOT be advertised through
   either an IGP or an EGP.

   By definition, the link-local prefix has a scope limited to a
   specific link. Since the prefix is the same on all IPv6 links,
   advertising it in any routing protocol does not make sense and,
   worse, may introduce nasty error conditions.

   Well known cases where link local prefixes could be advertised by
   mistake include:






Durand & Buclin              Informational