# 概念
服务器存在多块网卡时，可以通过bond来实现多块网卡并在一起使用；
# 模式
mode 0：load balancing (round-robin)
Support：需要Switch支持 <H3C5510支持>
负载均衡<IN/OUT>：是
冗余：是
bond MAC: 所有slave MAC相同
工作模式：Transmit packets in sequential order from the first available slave through the last.
mode 1: fault-tolerance (active-backup)
Support：无
负载均衡<IN/OUT>：否
冗余：是
bond MAC: 所有slave MAC相同
工作模式：同时只有一块网卡被激活，另一块网卡为backup，不工作
active抢夺：否
工作模式：Only one slave in the bond is active.
mode 4: lacp
802.3ad模式是IEEE标准 。
交换机端配置： interface AggregatePort 1 配置聚合口 interface GigabitEthernet 0/23 port- group 1 mode active 接口下开启lacp
主动模式 interface GigabitEthernet 0/24 port-group 1
mode active
mode 5: transmit load balancing
Support：Ethtool
ingoing：active-backup
outgoing：一块网卡用完，另一块网卡开始
mode 6: adaptive load balancing
IN/OUT:一块网卡用完，另一块网卡开始
这里配置了 bond4 模式 ，交换机开启 lacp, 配置聚合
# 配置
1. 网卡配置
# cat /etc/sysconfig/network-scripts/ifcfg-em1
DEVICE=em1
NAME=em1
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond4
SLAVE=yes
# cat /etc/sysconfig/network-scripts/ifcfg-em2
DEVICE=em2
NAME=em2
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond4
SLAVE=yes
# cat /etc/sysconfig/network-scripts/ifcfg-em3
DEVICE=em3
NAME=em3
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
MASTER=bond4
SLAVE=yes
# cat /etc/sysconfig/network-scripts/ifcfg-bond4
DEVICE=bond4
NAME=bond4
TYPE=Bond
BONDING_MASTER=yes
IPADDR=172.16.32.51
GATEWAY=172.16.32.1
NETMASK=255.255.255.0
DNS1=172.16.32.241
DNS2=172.16.32.243
PEERDNS=yes
ONBOOT=yes
BOOTPROTO=static
BONDING_OPTS="mode=802.3ad miimon=100 lacp_rate=fast"
# bonding生效
方法1：重启系统
# bonding状态查看
# cat /proc/net/bonding/bond4
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2 (0)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
802.3ad info
LACP rate: fast
Min links: 0
Aggregator selection policy (ad_select): stable
Active Aggregator Info:
Aggregator ID: 3
Number of ports: 3
Actor Key: 17
Partner Key: 7985
Partner Mac Address: e4:c2:d1:e5:29:40
Slave Interface: em1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 44:a8:42:21:87:ec
Aggregator ID: 3
Slave queue ID: 0
Slave Interface: em2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 44:a8:42:21:87:ed
Aggregator ID: 3
Slave queue ID: 0
Slave Interface: em3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 44:a8:42:21:87:ee
Aggregator ID: 3
Slave queue ID: 0
2. USB网卡不能加入bonding，不生效