Questions about setting bridge

[dave jones]

Hello,

I want to setup a bridge in a ring topology since a break at any point
along the ring would
still leave all stations connected. My machine has two nics. In
/etc/rc.conf, I have:

ifconfig_em0="inet 192.168.1.0  netmask 255.255.255.0"
cloned_interfaces="bridge0"
ifconfig_em0="up"
ifconfig_em1="up"
ifconfig_bridge0="addm em0 addm em1 up"
ifconfig_bridge0_alias0="192.168.1.0 netmask 255.255.255.0 up"

I tried to boot my clients using tftpd, but it seems doesn't work if I unpluged
em0. If I run "ifconfig em1 inet 192.168.1.0 netmask 255.255.255.0" then
my clients can boot via tftpd. But it's not a bridge, right?
I mean should I configure the same ip for em0, em1, and bridge0?

Thanks.

Dave.