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
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