AS690 policy configuration changes

Mon Nov 6 23:43:22 UTC 1995

All,

Starting with Friday morning's config run, AS690 will pick up any
route listed in various routing registries, including both those
routes with advisories and those routes without advisories.

ANS customers will not be affected by this change.

Routes without advisories will be examined for origin AS and will
inherit the most popular policy currently used for that AS.  For
example, if a route for 147.225/16 (origin AS1660) were listed
without an advisory, we would configure ourselves to listen for
147.225/16 in the same way that we listen to most other AS1660
routes (only from AS 1324 in this case).

If a route is registered in an AS for which we don't have existing
policy, it will not be routed.  In the example above, if 147.225/16
were registered without an aggregate, and it were the only route
registered with origin 1660, then we will not route it.  We have
a tool which flags such new ASes, and policy toward them will be
created regularly.  The rate of growth in number of ASes is not
high, particularly relative to the rate of growth in number of
routes.

For now, we will continue to build our policy dynamically from the
advisory attributes.  Assuming that this hybrid deployment goes
well, we intend to freeze our policy and convert to a system which
ignores advisories altogether.  With this system, the mechanics of
shifting policy will be quite easy (essentially involving only
ANS).  I expect to announce that freeze and shift in the next week
or so.  At that point, those folks who want to strip AS690 advisories
from any database may do so without a problem; as mentioned above,
any advisories registered after that time will be ignored.

Steve