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BGP: Add option to enforce first AS in AS_PATH

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This is optional check described in RFC 4271. Although this can be also
done by filters, it is widely implemented option in BGP implementations.

Thanks to Eugene Bogomazov for the original patch.
This commit is contained in:
Ondrej Zajicek (work)
2019-11-10 02:06:07 +01:00
parent becda5638a
commit 0b228fca04
5 changed files with 35 additions and 6 deletions
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doc/bird.sgml
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@ -2405,6 +2405,15 @@ using the following configuration parameters:
malformed and corresponding BGP updates are treated as withdraws.
Default: on.
<tag><label id="bgp-enforce-first-as">enforce first as [<m/switch/]</tag>
Routes received from an EBGP neighbor are generally expected to have the
first (leftmost) AS number in their AS path equal to the neighbor AS
number. This is not enforced by default as there are legitimate cases
where it is not true, e.g. connections to route servers. When this
option is enabled, routes with non-matching first AS number are rejected
and corresponding updates are treated as withdraws. The option is valid
on EBGP sessions only. 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