eno1 en2分别为服务器两个物理网卡，聚合成bond0跟交换机连接。
auto lo
iface lo inet loopback
auto eno1
iface eno1 inet manual
auto eno2
iface eno2 inet manual
auto bond0
iface bond0 inet manual
bond-slaves eno1 eno2
bond-miimon 100
bond-mode 802.3ad
bond-xmit-hash-policy layer2+3
#Switch3 port 11+12
auto vmbr0
iface vmbr0 inet static
address 192.168.8.2/24
gateway 192.168.8.1
bridge-ports bond0
bridge-stp off
bridge-fd 0