I recommend posting to the ports@ mailing list, requesting guidance on quagga usage. As there may be a problem, I would treat your request like a problem report and include 1) your
dmesg, 2) your
rc.conf.local file, 3) your changes to the
/etc/sysctl.conf file, and 4) your quagga configuration settings.
http://www.openbsd.org/mail.html
http://www.openbsd.org/report.html