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add docs for babeld maxlen filter 

Signed-off-by: Marek Küthe <m.k@mk16.de>
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Marek Küthe 2023-01-07 20:34:54 +01:00
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# Implement max-len filter
To implement a max-length filter, we need a rule/policy/filter file that contains the corresponding prefixes with their maximum length. The entitydb contains a bash script `build_maxlen_filter.sh` for this purpose. If you run this script with the argument `babeld`, you will get a babeld-compatible list.
This list can now be inserted into the configuration file instead of `in ip fd00::/8 le 64 ge 44 allow`. It is recommended to automate this process.