enforce-first-as disable

[firas73737 at yahoo.com]

Hello BIRD Users,
"enforce-first-as disable" is a BGP option that can be configured for a BGP neighbor on a Cisco router. It is usually configured when the neighbor is a route server as route servers do not add their AS to the AS path of the prefixes they advertise. If I configure BIRD to BGP peer with a route server, how can I configure this option please? I do not find it in BIRD user guide.
Thanks in advance!Firas
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