In a message written on Fri, Sep 30, 2011 at 10:51:58AM -0400, Christopher Morrow wrote: > the troubleshooting though with something like unique origin is > 'simpler' for them: "Oh, as27 is NYC, as37 is WDC... why is Newark > seeing WDC as the best path?"
I'm not sure I get it. Unique origin ASN output (simplified) 10.1.2.3/32 65000 65001 * 65002 (Best) 65003 65001 So we know it's coming from site 65002. Using the F-Root model, with an origin of 65999 for the Anycast routes: 10.1.2.3/32 65000 65999 65001 65999 * 65002 65999 (Best) 65003 65001 65999 We still know it's coming from site 65002 by just looking. I have a hard time calling one "simpler" than the other, indeed I would call them pretty darn equal. But here's the difference, let's say I have 20 Anycasted routes for different services, but I originate them all from 65999, I can see the status of all 20 with: show bgp ipv4 uni regexp _65999$ I'll get 20 lines, showing me how each virtual is routed. With a unique origin ASN configuration, to get the same info for 20 routes I would need 20 lines like: show bgp ipv4 uni 10.1.2.3/32 show bgp ipv4 uni 10.1.2.4/32 show bgp ipv4 uni 10.2.2.1/32 And so on, or have the discipline to keep them all in one netblock so: show bgp ipv4 uni 10.1.2.3/24 longer-prefixes produces useful output. Thus I think I can make a good argument that having a consistent origin ASN makes troubleshooting easier when you have multiple Anycast routes, because you can select the entire set of routes by origin ASN. -- Leo Bicknell; E-mail: bickn...@isc.org, Phone: +1 650 423 1358 INOC*DBA *3357*592; Internet Systems Consortium, Inc. www.isc.org _______________________________________________ GROW mailing list GROW@ietf.org https://www.ietf.org/mailman/listinfo/grow