routing question

[Evgenii Davidov]

helo,
i had some servers with freebsd8.0/i386 and mpd5.4
when user tried to connect pppoe twice such an error appeared:
Jul 21 01:20:01 i2 mpd: [B-76] IFACE: Adding IPv4 address to ng75 failed: File exists
(because the route to this static ip already was received by ospf from other server)
then i added a new server with freebsd9.3/amd64 and mpd5.7
and i noticed that to this server users can connect even if they are already connected to the one of the old
on mikrotik connected to the same ospf area i can see 2 routes to that ip
what's the difference, and how i can tune a new server to the old behavior? thanks!

-- 
Evgenii V Davidov