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Doc: Add documentation for BGP option 'allow as sets'

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Ondrej Zajicek (work) 2019-11-05 16:00:25 +01:00
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doc/bird.sgml
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@ -2395,6 +2395,16 @@ using the following configuration parameters:
completely disabled and you should ensure loop-free behavior by some
other means. Default: 0 (no local AS number allowed).
<tag><label id="bgp-allow-as-sets">allow as sets [<m/switch/]</tag>
AS path attribute received with BGP routes may contain not only
sequences of AS numbers, but also sets of AS numbers. These rarely used
artifacts are results of inter-AS route aggregation. AS sets are
deprecated (<rfc id="6472">), and likely to be rejected in the future,
as they complicate security features like RPKI validation. When this
option is disabled, then received AS paths with AS sets are rejected as
malformed and corresponding BGP updates are treated as withdraws.
Default: off.
<tag><label id="bgp-enable-route-refresh">enable route refresh <m/switch/</tag>
After the initial route exchange, BGP protocol uses incremental updates
to keep BGP speakers synchronized. Sometimes (e.g., if BGP speaker