<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Generally, you’ll need an export and import policy for each peer AS.<div class=""><br class=""></div><div class="">Export should describe what you send to them.</div><div class="">Import should describe what you will accept from them.</div><div class=""><br class=""></div><div class="">In the case of upstreams, that’s usually “to X export MYAS[+customer_AS list]” and “from X import ANY”.</div><div class=""><br class=""></div><div class="">In the case of downstream customers, that’s usually “to Y export ANY” and “from Y import Y”.</div><div class=""><br class=""></div><div class="">Obviously, if your customer has downstream ASs, that import policy will expand.</div><div class=""><br class=""></div><div class="">Owen</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 20, 2021, at 17:06 , Mike Hammett <<a href="mailto:nanog@ics-il.net" class="">nanog@ics-il.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta charset="UTF-8" class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: arial, helvetica, sans-serif; font-size: 10pt;" class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 10pt;" class="">I'm trying to firm up my grasp of how I define my neighbor ASes in my IRR entries.</span></font><div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;" class=""><br class=""></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><a href="https://bgp.he.net/AS40764#_irr" class="">https://bgp.he.net/AS40764#_irr</a></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class="">In my aut-num, I've defined my two upstreams (Intercarrier and Cogent). I've used their AS-Set or just their AS and used that in the export lines.</span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class="">I'd assume I'd do the reverse in the import fields for any downstream customers.</span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class="">I realized after looking at this that I need to add an export to IX and other peering connections.</span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class="">What else do I need to change?</span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class=""><br class=""></span></font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><span style="font-size: 13.3333px;" class="">Yes, I realized that I just asked NANOG to criticize me. Hopefully, I get more help than flames. ;-)<br class=""></span></font><br class=""><div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;" class=""><span name="x" class=""></span><br class=""><br class="">-----<br class="">Mike Hammett<br class="">Intelligent Computing Solutions<br class=""><a href="http://www.ics-il.com/" class="">http://www.ics-il.com</a><br class=""><br class="">Midwest-IX<br class=""><a href="http://www.midwest-ix.com/" class="">http://www.midwest-ix.com</a></div></div></div></div></blockquote></div><br class=""></div></body></html>