centos7物理机网桥配置

yum provides brctl #查询工具所需安装的软件包

[root@localhost ~]# yum provides brctl
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * extras: mirrors.cn99.com
 * updates: mirrors.cn99.com
base/7/x86_64/filelists_db                                      | 7.2 MB  00:00:00    
extras/7/x86_64/filelists_db                                    | 277 kB  00:00:00    
updates/7/x86_64/filelists_db                                   | 8.2 MB  00:00:00    
bridge-utils-1.5-9.el7.x86_64 : Utilities for configuring the linux ethernet bridge
Repo        : base
Matched from:
Filename    : /usr/sbin/brctl
 
 
 
bridge-utils-1.5-9.el7.x86_64 : Utilities for configuring the linux ethernet bridge
Repo        : @anaconda
Matched from:
Filename    : /sbin/brctl
 
 
 
bridge-utils-1.5-9.el7.x86_64 : Utilities for configuring the linux ethernet bridge
Repo        : @anaconda
Matched from:
Filename    : /usr/sbin/brctl
 
 
 
[root@localhost ~]# brctl -h
Usage: brctl [commands]
commands:
    addbr             add bridge
    delbr             delete bridge
    addif           add interface to bridge
    delif           delete interface from bridge
    hairpin       {on|off}    turn hairpin on/off
    setageing         set ageing time
    setbridgeprio         set bridge priority
    setfd             set bridge forward delay
    sethello          set hello time
    setmaxage         set max message age
    setpathcost       set path cost
    setportprio       set port priority
    show        [  ]      show a list of bridges
    showmacs          show a list of mac addrs
    showstp           show bridge stp info
    stp          {on|off} turn stp on/off
[root@localhost ~]#

yum install bridge-utils -y #安装网桥工具

brctl show #展示网桥
brctl addbr br100 #添加网桥

网桥及网卡配置文件：

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-em1
TYPE=Ethernet
BOOTPROTO=none
NAME=em1
DEVICE=em1
ONBOOT=yes
BRIDGE="br100"
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-br100
TYPE=Bridge
BOOTPROTO=static
NAME=br100
DEVICE=br100
GATEWAY=192.168.3.1
DNS1=119.29.29.29
ONBOOT=yes
IPADDR=192.168.3.225
PREFIX=24
[root@localhost ~]#

brctl addif br100 em1 #添加网卡到网桥

systemctl stop NetworkManager

systemctl disable NetworkManager #禁用此服务

systemctl restart network #重启网络

配置完成效果：

[root@localhost ~]# ifconfig
br100: flags=4163  mtu 1500
        inet 192.168.3.225  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 fe80::928d:6eff:fec0:946c  prefixlen 64  scopeid 0x20
        ether 90:8d:6e:c0:94:6c  txqueuelen 1000  (Ethernet)
        RX packets 42297  bytes 3766761 (3.5 MiB)
        RX errors 0  dropped 1913  overruns 0  frame 0
        TX packets 242  bytes 32037 (31.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
em1: flags=4163  mtu 1500
        inet6 fe80::928d:6eff:fec0:946c  prefixlen 64  scopeid 0x20
        ether 90:8d:6e:c0:94:6c  txqueuelen 1000  (Ethernet)
        RX packets 42494  bytes 4573816 (4.3 MiB)
        RX errors 0  dropped 95  overruns 0  frame 0
        TX packets 249  bytes 34555 (33.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 30 
 
lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2  bytes 200 (200.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2  bytes 200 (200.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0