Hello, and welcome!
The discussion of quagga on the ports@ mailing list you cited, from January 1-3 in 2013, resulted in changes to the net/quagga port on January 4 of that year. This change was included in OpenBSD 5.3. If you are using 5.3 or a later release, and its matching quagga package, you have this change in your system.
Double check that you've enabled multicast routing. It is not enabled by default. You need to set multicast_router=YES in /etc/rc.conf.local to enable the appropriate sysctl values.
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