ifcfg
[root@co network-scripts]# cat ifcfg-eth0
DEVICE="eth0"
BOOTPROTO="static"
#BROADCAST="192.168.1.255"
#DNS1="192.168.1.1"
#GATEWAY="192.168.1.1"
HWADDR="00:25:22:9C:F2:BE"
#IPADDR="192.168.1.30"
#NETMASK="255.255.255.0"
NM_CONTROLLED="no"
BRIDGE="br0"
ONBOOT="yes"
TYPE="Ethernet"
UUID="4cb6bec4-d848-4ef0-945e-8a6e45bd5516"
ETHTOOL_OPTS="speed 100 duplex full autoneg off"
[root@co network-scripts]# cat ifcfg-br0
DEVICE="br0"
TYPE="Bridge"
BOOTPROTO="static"
BROADCAST="192.168.1.255"
DNS1="192.168.1.1"
GATEWAY="192.168.1.1"
HWADDR="00:25:22:9C:F2:BE"
IPADDR="192.168.1.30"
NETMASK="255.255.255.0"
NM_CONTROLLED="no"
ONBOOT="yes"
STP="on"