centos7双网卡绑定

# 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

来源： http://www.centoscn.com/CentOS/Intermediate/2016/0130/6726.html