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-rw-r--r--doc/bird.sgml10
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml
index 384af835..e0f4fb76 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -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