On Mon, 20 Feb 2023 01:29:40 +0100 Daniel Gröber <d...@darkboxed.org> wrote:
> Interesting, > > Did you notice this passage: > > > This problem could be solved by calculating the Babel metric based on the > > AS path length, but I am unsure if this is technically possible, on the > > other hand this may compromise the loop-free nature of Babel. This > > problem, but with no potential solution, also occurs with the Default > > Route. > > I think the answer should be that no matter how you mess with the metrics > babel should still remain loop-free, right? The metrics thing actually works. I use the following "formula" in bird: ``` babel_metric = 70 + (2 * bgp_path.len); ``` My understanding is that it should remain loop-free as long as each Babel hop increments the metric by at least one. > > On Sun, Feb 19, 2023 at 03:53:03PM +0100, Juliusz Chroboczek wrote: > > Interestingly, the two networks use overlapping prefixes, which requires > > enumerating hundreds of prefixes in their filters. This is a case where > > BIRD's support for Babel is likely to be useful: babeld's filtering > > engine is simply not designed for large numbers of filtering rules. > > I guess it would also help if babel could send some kind of metadata along > with the routes. Like BGP communities or some such. Has this been thought > about already? That's right. This would be very practical a kind of BGP communities for Babel. The only reason I personally prefer babeld over bird is that babeld can calculate latency on its own with the RTT extension. > > For example while debugging rtt based routing metrics I would have loved to > be able to send along the raw RTT value along with each route :) > > --Daniel > > _______________________________________________ > Babel-users mailing list > Babel-users@alioth-lists.debian.net > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/babel-users -- Marek Küthe m...@mk16.de er/ihm he/him
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