玩转Openvwitch第六站：Port和Bond

有关Interface，就不得不提Bond

Bond将设备用多个连接在一起，形成一个虚拟的连接，从而实现高可用性以及高吞吐量

很多别名：LACP Trunk, Bond, Etherchannel

LACP (Link Aggregation Control Protocol)

bond_mode

• active-backup: 一个连接是active，其他的backup，当active失效的时候，backup顶上

• balance-slb: 流量安装源MAC和output VLAN进行负载均衡

• balance-tcp:必须在支持LACP协议的情况下才可以，可根据L2, L3, L4进行负载均衡

我们做个实验测试Bond

ovs-vsctl add-bond ubuntu_br bond0 first_br second_br

ovs-vsctl add-bond helloworld bond1 first_if second_if

ovs-vsctl set Port bond0 lacp=active

ovs-vsctl set Port bond1 lacp=active

查看Bond

查看LACP

root@popsuper1982:/home/openstack# ovs-appctl lacp/show

---- bond0 ----

        status: active negotiated

        sys_id: 2a:96:0e:c7:85:49

        sys_priority: 65534

        aggregation key: 7

        lacp_time: slow

slave: first_br: current attached

        port_id: 7

        port_priority: 65535

        may_enable: true

        actor sys_id: 2a:96:0e:c7:85:49

        actor sys_priority: 65534

        actor port_id: 7

        actor port_priority: 65535

        actor key: 7

        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 72:d2:d3:59:8c:41

        partner sys_priority: 65534

        partner port_id: 3

        partner port_priority: 65535

        partner key: 3

        partner state: activity aggregation synchronized collecting distributing

slave: second_br: current attached

        port_id: 8

        port_priority: 65535

        may_enable: true

        actor sys_id: 2a:96:0e:c7:85:49

        actor sys_priority: 65534

        actor port_id: 8

        actor port_priority: 65535

        actor key: 7

        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 72:d2:d3:59:8c:41

        partner sys_priority: 65534

        partner port_id: 4

        partner port_priority: 65535

        partner key: 3

        partner state: activity aggregation synchronized collecting distributing

---- bond1 ----

        status: active negotiated

        sys_id: 72:d2:d3:59:8c:41

        sys_priority: 65534

        aggregation key: 3

        lacp_time: slow

slave: first_if: current attached

        port_id: 3

        port_priority: 65535

        may_enable: true

        actor sys_id: 72:d2:d3:59:8c:41

        actor sys_priority: 65534

        actor port_id: 3

        actor port_priority: 65535

        actor key: 3

        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 2a:96:0e:c7:85:49

        partner sys_priority: 65534

        partner port_id: 7

        partner port_priority: 65535

        partner key: 7

        partner state: activity aggregation synchronized collecting distributing

slave: second_if: current attached

        port_id: 4

        port_priority: 65535

        may_enable: true

        actor sys_id: 72:d2:d3:59:8c:41

        actor sys_priority: 65534

        actor port_id: 4

        actor port_priority: 65535

        actor key: 3

        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 2a:96:0e:c7:85:49

        partner sys_priority: 65534

        partner port_id: 8

        partner port_priority: 65535

        partner key: 7

        partner state: activity aggregation synchronized collecting distributing

默认情况下bond_mode是active-backup模式，一开始active的是first_br和first_if

从192.168.100.100 ping 192.168.100.102，以及192.168.100.101 ping 192.168.100.103，都是从first_if通过

如果把first_if设成down，则包的走向会变

ip link set first_if down

发现second_if开始有流量，京first_if变成down, 192.168.100.100和192.168.100.101似乎没有收到影响

second_br和second_if变成active

重启first_if，但是second_br和second_if仍然是active

ip link set first_if up

把bond_mode设为balance-slb

• ovs-vsctl set Port bond0 bond_mode=balance-slb

• ovs-vsctl set Port bond1 bond_mode=balance-slb

• 同时192.168.100.100 ping 192.168.100.102,192.168.100.101 ping 192.168.100.103, 已经分流了

把bond_mode设为balance-tcp

• ovs-vsctl set Port bond0 bond_mode=balance-tcp

• ovs-vsctl set Port bond1 bond_mode=balance-tcp

• 同时在192.168.100.100上：netperf -H 192.168.100.102 -t UDP_STREAM -- -m 1024

• 在192.168.100.101上： netperf -H 192.168.100.103 -t UDP_STREAM -- -m 1024