Folks, As previously mentioned, ANS is moving to a new configuration system which will eliminate the need for registering AS690 advisories with RIPE-181 route objects. Our initial deployment described below has gone well, and as a result we will freeze our aut-num (currently still machine generated based on advisories) on Friday, 11/17, at midnight ET (Saturday, 11/18, 5am GMT). Tuesday morning's AS690 config run will use the frozen aut-num. After this time, AS690 advisories will be ignored. Policy toward routes registered in the IRR will be based solely on origin AS. The origin AS will be expanded to the set of route objects registered for that origin AS; the resulting list of prefixes will be used in generating router configurations, as today. Refinement of AS690 import policies will begin on a per AS basis next week, starting with large origin ASes. The human readable version of the 18,000 line AS690 aut-num is currently available at: ftp://ftp.ans.net/pub/info/routing-stats/aut-num-as-690 Steve -------- To: nanog@merit.edu Subject: AS690 policy configuration changes Date: Mon, 06 Nov 1995 18:43:22 -0500 From: Steve Heimlich <heimlich@kingbee.ans.net> All, Starting with Friday [11/10] 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