Hi All At $Dayjob I have been working around an aggregation bug in our routers and manually specifying prefix’s at the three levels we operate (/22, /23, /24) and using prefix filters to advertise /24’s to APE / WIX, /23’s to our domestic transit, and only the /22’s to international transit as a method of Traffic Management / Traffic Engineering to utilise cheapest links available. I have been exploring the looking glass services of a number of entities to see what propagates to them (that they enter into the forwarding database) and I am seeing some entities (who announce peering at APE for example) having the /22 and /23 routes in the LG outputs and following the /23 path in trace route. I am asking for two fold information. Can someone / everyone point me at their best guide to BGP “Best Practice” regarding advertising prefixes? and also can I get people’s specific advice about what they accept / do to announcements before entering them into their routers as accepted routes and what they would expect to see advertised to ensure my goals are reached. I made these changes to help reduce my contribution to the ballooning of the global routing table but I also don’t want to go to extremes on polluting the APE routing table by advertising the 12 /24’s plus the 6 /23’s and the 3 /22’s. Also can I get consensus information (or peoples opinions) about am I abusing / dis respecting APE with my announcements and how I should structure my announcements to be a respectable citizen here while providing the best hints to my preferred handling of traffic? (and feel free to let me know if I should just announce the /22’s and accept that some people choose to prioritise other paths) Thank you in advance for any input, feel free to reply off list. Regards Alexander Alexander Neilson Neilson Productions Limited alexander(a)neilson.net.nz 021 329 681 022 456 2326