SH> Date: Sat, 14 Feb 2004 18:00:51 +0000 SH> From: Sven Huster SH> The thing that happend was that the core believed that the SH> best path out is via R1, which R1 thought it was via R2. So a SH> little loop there. So core sends to R1, which sends to R2... where does R2 send the packets? Back to R1? What are you doing in your IGP? Are you using { iBGP | OSPF | IS-IS | ... }? How does R1 learn routes from Transit2? What about confederations? Used correctly, they're helpful. Used incorrectly in similar scenarios, an iBGP mesh becomes a constantly-oscillating iBGP mess. Are you using either router bgp xxxx bgp bestpath compare-routerid or router bgp xxxx no bgp bestpath compare-routerid on all routers? I'm wondering if R1 prefers Transit2 and R2 prefers Transit1 due to different path selection algorithms... Can you "sh route" or "sh ip bgp" for a route that loops? Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses : blacklist@brics.com -or- alfra@intc.net -or- curbjmp@intc.net Sending mail to spambait addresses is a great way to get blocked.