Thanks Saku and Gert for the kind replies , well received. ________________________________ From: cisco-nsp <cisco-nsp-boun...@puck.nether.net> on behalf of Gert Doering via cisco-nsp <cisco-nsp@puck.nether.net> Sent: Sunday, March 12, 2023 9:58 PM To: Saku Ytti <s...@ytti.fi> Cc: cisco-nsp@puck.nether.net <cisco-nsp@puck.nether.net> Subject: Re: [c-nsp] BGP Routes
Hi, On Sun, Mar 12, 2023 at 08:51:36PM +0200, Saku Ytti via cisco-nsp wrote: > You might want add-path or best-external for predictability and > improved convergence time. Last time we did best-external with ASR9k it only worked in a useful way if you are using labeled-unicast. That was many years ago, so it might have been fixed, but "test and expect surprises". In our case, the effect was that the local router that exported best-external to its peers was also installing the best-external path into its local FIB, as a load-shared path(!). So we had packets come in from uplink, the "good" path was "send internal over our network", but half the packets got balanced via the "best-external" path. Intereresting isseus ensued. To me this never made sense but TAC claimed "this is the way it is, we're not considering this a bug, use labeled-unicast, then it will work fine". As we didn't use LU, I could not verify this. gert -- "If was one thing all people took for granted, was conviction that if you feed honest figures into a computer, honest figures come out. Never doubted it myself till I met a computer with a sense of humor." Robert A. Heinlein, The Moon is a Harsh Mistress Gert Doering - Munich, Germany g...@greenie.muc.de _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/