/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
TYPE=Ethernet
HWADDR=XX:XX:XX:XX:XX:XX
ONBOOT=yes
BOOTPROTO="none"
BRIDGE=br0

/etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
IPADDR=192.168.10.100
NETMASK=255.255.255.0
NETWORK=192.168.10.0
ONBOOT=yes

# /etc/init.d/network restart

# ifconfig
# brctl show