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我们这一节来看Port

一般来说一个Port就是一个Interface，当然也有一个Port对应多个Interface的情况，成为Bond

VLAN Configuration

Port的一个重要的方面就是VLAN Configuration，有两种模式：

• trunk port，这个port不配置tag，配置trunks，如果trunks为空，则所有的VLAN都trunk，也就意味着对于所有的VLAN的包，本身带什么VLAN ID，就是携带者什么VLAN ID，如果没有设置VLAN，就属于VLAN 0，全部允许通过。如果trunks不为空，则仅仅带着这些VLAN ID的包通过。
• access port，这个port配置tag，从这个port进来的包会被打上这个tag，如果从其他的trunk port中进来的本身就带有VLAN ID的包，如果VLAN ID等于tag，则会从这个port发出，从其他的access port上来的包，如果tag相同，也会被forward到这个port。从access port发出的包不带VLAN ID。如果一个本身带VLAN ID的包到达access port，即便VLAN ID等于tag，也会被抛弃。

我们创建下面的拓扑来做一个实验：

sudo ovs-vsctl add-port helloworld first_br

sudo ovs-vsctl add-port helloworld second_br

sudo ovs-vsctl add-port helloworld third_br

sudo ovs-vsctl set Port vnet8 tag=101

sudo ovs-vsctl set Port vnet9 tag=102

sudo ovs-vsctl set Port vnet10 tag=103

sudo ovs-vsctl set Port first_br tag=103

sudo ovs-vsctl clear Port second_br tag

sudo ovs-vsctl set Port third_br trunks=101,102

sudo ovs-vsctl set bridge helloworld flood-vlans=101,102,103

sudo ovs-vsctl -- --id=@mirror get Mirror mirrorvnet9 -- remove Bridge helloworld mirrors @mirror

$ sudo ovs-vsctl show
c24322e6-8453-402a-afaf-64757ef231e9
    Bridge helloworld
        Port "vnet8"
            tag: 101
            Interface "vnet8"
        Port first_br
            tag: 103
            Interface first_br
        Port second_br
            Interface second_br
        Port "vnet10"
            tag: 103
            Interface "vnet10"
        Port helloworld
            Interface helloworld
                type: internal
        Port "vnet9"
            tag: 102
            Interface "vnet9"
        Port third_br
            trunks: [101, 102]
            Interface third_br
    ovs_version: "2.0.1"

我们首先从10.10.10.3来ping 10.10.10.4，应该first_if和second_if能够收到包。

first_if收到包了，从first_br出来的包头是没有VLAN ID的

$ sudo tcpdump  -n -e -i first_if arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on first_if, link-type EN10MB (Ethernet), capture size 65535 bytes
23:22:45.707470 ca:d4:fd:47:a6:ce > 52:54:00:9b:d5:be, ethertype ARP (0x0806), length 42: Request who-has 10.10.10.3 tell 10.10.10.4, length 28
23:22:45.708170 52:54:00:9b:d5:be > ca:d4:fd:47:a6:ce, ethertype ARP (0x0806), length 42: Reply 10.10.10.3 is-at 52:54:00:9b:d5:be, length 28

second_if也收到包了，由于second_br是trunk port，因而出来的包头是有VLAN ID的，103

$ sudo tcpdump  -n -e -i second_if arp
tcpdump: WARNING: second_br: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on second_br, link-type EN10MB (Ethernet), capture size 65535 bytes
23:22:45.707727 ca:d4:fd:47:a6:ce > 52:54:00:9b:d5:be, ethertype 802.1Q (0x8100), length 46: vlan 103, p 0, ethertype ARP, Request who-has 10.10.10.3 tell 10.10.10.4, length 28
23:22:45.708176 52:54:00:9b:d5:be > ca:d4:fd:47:a6:ce, ethertype 802.1Q (0x8100), length 46: vlan 103, p 0, ethertype ARP, Reply 10.10.10.3 is-at 52:54:00:9b:d5:be, length 28

third_if收不到包

$ sudo tcpdump  -n -e -i third_if arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on third_if, link-type EN10MB (Ethernet), capture size 65535 bytes

然后我们从10.10.10.1在ping 10.10.10.6，则second_if和third_if可以收到包

first_if收不到包

second_br能够收到包，而且包头里面是VLAN ID = 101

$ sudo tcpdump  -n -e -i second_br arp
tcpdump: WARNING: second_br: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on second_br, link-type EN10MB (Ethernet), capture size 65535 bytes
23:27:22.645546 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:23.644828 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:24.644837 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:25.651223 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:26.648770 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has

third_if也能收到包，而且包头里面是VLAN ID =101

$ sudo tcpdump  -n -e -i third_if arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on third_if, link-type EN10MB (Ethernet), capture size 65535 bytes
23:27:22.645561 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:23.644844 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:24.644853 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28
23:27:25.651238 52:54:00:9b:d5:bc > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 101, p 0, ethertype ARP, Request who-has 10.10.10.6 tell 10.10.10.1, length 28

最后我们从10.10.10.2来ping 10.10.10.5，则second_if和third_if可以收到包

first_if收不到包

second_br能够收到包，而且包头里面是VLAN ID = 102

$ sudo tcpdump  -n -e -i second_br arp
tcpdump: WARNING: second_br: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on second_br, link-type EN10MB (Ethernet), capture size 65535 bytes
23:31:17.641237 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:18.638875 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:19.638881 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:20.657189 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:21.654874 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28

third_if也能收到包，而且包头里面是VLAN ID =103

$ sudo tcpdump  -n -e -i third_if arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on third_if, link-type EN10MB (Ethernet), capture size 65535 bytes
23:31:22.654872 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:23.672558 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:24.670893 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28
23:31:25.670796 52:54:00:9b:d5:bd > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 102, p 0, ethertype ARP, Request who-has 10.10.10.5 tell 10.10.10.2, length 28

Bonding Configuration

bond_mode:

• balance-slb: Balances flows among slaves based on source MAC address and output VLAN
• active-backup:Assigns all flows to one slave, failing over to a backup slave when the active slave is disabled.

如果bridge的另一端支持LACP协议，则还有两种状态：

• balance?tcp：Balances flows among slaves based on L2, L3, and L4 protocol information such as destination MAC address, IP address, and TCP port.
• stable：Attempts to always assign a given flow to the same slave consistently.

other_config : bond-detect-mode:

• Defaults to carrier which uses each interface’s carrier to detect failures.
• When set to miimon, will check for failures by polling each interface’s MII. 仅仅check接口是否正常

LACP Configuration:

LACP：Link Aggregation Control Protocol

Link Aggregation

• Link aggregation allows you to bond multiple parallel links into a single virtual link (from the STP perspective).
• With parallel links being replaced by a single link, STP detects no loops and all the physical links can be fully utilized.
• Traditional LA : port channel, Etherchannel, link bonding or multi-link trunking

Traditional Link Aggregation

• A port channel bundles up to eight individual interfaces into a group to provide increased bandwidth and redundancy.
• Port channeling also load balances traffic across these physical interfaces.
• You create a port channel by bundling compatible interfaces.
• You can configure and run either static port channels or ports channels running the Link Aggregation Control Protocol (LACP).

LACP (Link Aggregation Control Protocol)

• individual links can be combined into LACP port channels and channel groups
  • Static LACP : creation of channel groups and addition of ports are manually configured. LACP is to determine the ports are selected or standby
  • Dynamic LACP : all above are negotiated via LACPDU between both sides

Multi-Chassis Link Aggregation

• In Multichassis EtherChannel (MCEC), the DHD is dual-homed to two upstream PoAs(points of attachment).
  • The DHD is incapable of running any loop prevention control protocol such as Multiple Spanning Tree (MST).
• One method is to place the DHD‘s uplinks in a LAG, commonly referred to as EtherChannel. (LACP enabled).
• LACP is a link-level control protocol that allows the dynamic negotiation and establishment of LAGs.
• Multichassis LACP: An extension of the LACP implementation to PoAs is required to convey to a DHD that it is connected to a single virtual
  LACP peer and not to two disjointed devices.

我们创建下面的拓扑结构：

$ sudo ovs-vsctl add-bond hello bond0 first_br second_br
$ sudo ovs-vsctl add-bond world bond1 first_if second_if
$ sudo ovs-vsctl show
c24322e6-8453-402a-afaf-64757ef231e9
    Bridge world
        Port world
            Interface world
                type: internal
        Port "bond1"
            Interface second_if
            Interface first_if
        Port "vnet10"
            Interface "vnet10"
        Port "vnet11"
            Interface "vnet11"
    Bridge hello
        Port "vnet8"
            Interface "vnet8"
        Port "vnet9"
            Interface "vnet9"
        Port hello
            Interface hello
                type: internal
        Port "bond0"
            Interface first_br
            Interface second_br
    ovs_version: "2.0.1"

$ sudo ovs-vsctl set Port bond0 lacp=active
$ sudo ovs-vsctl set Port bond1 lacp=active

$ sudo ovs-appctl bond/show
---- bond0 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_br: enabled
        active slave
        may_enable: true

slave second_br: enabled
        may_enable: true

---- bond1 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_if: enabled
        active slave
        may_enable: true

slave second_if: enabled
        may_enable: true

$ sudo ovs-appctl lacp/show
---- bond0 ----
        status: active negotiated
        sys_id: 4a:f5:ee:f2:40:40
        sys_priority: 65534
        aggregation key: 3
        lacp_time: slow

slave: first_br: current attached
        port_id: 3
        port_priority: 65535
        may_enable: true

        actor sys_id: 4a:f5:ee:f2:40:40
        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: 8a:7b:f0:8b:94:40
        partner sys_priority: 65534
        partner port_id: 4
        partner port_priority: 65535
        partner key: 4
        partner state: activity aggregation synchronized collecting distributing

slave: second_br: current attached
        port_id: 4
        port_priority: 65535
        may_enable: true

        actor sys_id: 4a:f5:ee:f2:40:40
        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: 8a:7b:f0:8b:94:40
        partner sys_priority: 65534
        partner port_id: 5
        partner port_priority: 65535
        partner key: 4
        partner state: activity aggregation synchronized collecting distributing
---- bond1 ----
        status: active negotiated
        sys_id: 8a:7b:f0:8b:94:40
        sys_priority: 65534
        aggregation key: 4
        lacp_time: slow

slave: first_if: current attached
        port_id: 4
        port_priority: 65535
        may_enable: true

        actor sys_id: 8a:7b:f0:8b:94:40
        actor sys_priority: 65534
        actor port_id: 4
        actor port_priority: 65535
        actor key: 4
        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 4a:f5:ee:f2:40:40
        partner sys_priority: 65534
        partner port_id: 3
        partner port_priority: 65535
        partner key: 3
        partner state: activity aggregation synchronized collecting distributing

slave: second_if: current attached
        port_id: 5
        port_priority: 65535
        may_enable: true

        actor sys_id: 8a:7b:f0:8b:94:40
        actor sys_priority: 65534
        actor port_id: 5
        actor port_priority: 65535
        actor key: 4
        actor state: activity aggregation synchronized collecting distributing

        partner sys_id: 4a:f5:ee:f2:40:40
        partner sys_priority: 65534
        partner port_id: 4
        partner port_priority: 65535
        partner key: 3
        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

这个时候我们从10.10.10.1 ping 10.10.10.3，以及10.10.10.2 ping 10.10.10.4，都是从first_if通过

$ sudo tcpdump  -n -e -i first_if
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on first_if, link-type EN10MB (Ethernet), capture size 65535 bytes
18:58:34.402793 f2:ac:70:72:49:61 > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
18:58:35.403821 ca:d4:fd:47:a6:ce > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
18:59:04.402847 f2:ac:70:72:49:61 > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
18:59:05.403779 ca:d4:fd:47:a6:ce > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
18:59:09.950809 52:54:00:9b:d5:bc > 52:54:00:9b:d5:be, ethertype IPv4 (0x0800), length 98: 10.10.10.1 > 10.10.10.3: ICMP echo request, id 1166, seq 1, length 64
18:59:09.951228 52:54:00:9b:d5:be > 52:54:00:9b:d5:bc, ethertype IPv4 (0x0800), length 98: 10.10.10.3 > 10.10.10.1: ICMP echo reply, id 1166, seq 1, length 64
18:59:33.294940 52:54:00:9b:d5:bd > 52:54:00:9b:d5:bf, ethertype IPv4 (0x0800), length 98: 10.10.10.2 > 10.10.10.4: ICMP echo request, id 1148, seq 1, length 64
18:59:33.295820 52:54:00:9b:d5:bf > 52:54:00:9b:d5:bd, ethertype IPv4 (0x0800), length 98: 10.10.10.4 > 10.10.10.2: ICMP echo reply, id 1148, seq 1, length 64

从上面我们也可以看到LACP包

如果把first_if设成down，则包的走向会变

sudo ip link set first_if down

我们发现second_if开始有流量，京first_if变成down，10.10.10.1和10.10.10.2似乎没有收到影响

$ sudo tcpdump  -n -e -i second_if
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on second_if, link-type EN10MB (Ethernet), capture size 65535 bytes
19:14:34.415216 66:63:74:a9:0e:f2 > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:14:35.411181 76:fa:16:61:d7:0e > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:16:01.162066 52:54:00:9b:d5:bc > 52:54:00:9b:d5:be, ethertype IPv4 (0x0800), length 98: 10.10.10.1 > 10.10.10.3: ICMP echo request, id 1167, seq 33, length 64
19:16:01.162298 52:54:00:9b:d5:be > 52:54:00:9b:d5:bc, ethertype IPv4 (0x0800), length 98: 10.10.10.3 > 10.10.10.1: ICMP echo reply, id 1167, seq 33, length 64
19:16:01.781051 52:54:00:9b:d5:bd > 52:54:00:9b:d5:bf, ethertype IPv4 (0x0800), length 98: 10.10.10.2 > 10.10.10.4: ICMP echo request, id 1149, seq 29, length 64
19:16:01.781565 52:54:00:9b:d5:bf > 52:54:00:9b:d5:bd, ethertype IPv4 (0x0800), length 98: 10.10.10.4 > 10.10.10.2: ICMP echo reply, id 1149, seq 29, length 64

second_br和second_if变成active

$ sudo ovs-appctl bond/show    
---- bond0 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_br: disabled
        may_enable: false

slave second_br: enabled
        active slave
        may_enable: true

---- bond1 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_if: disabled
        may_enable: false

slave second_if: enabled
        active slave
        may_enable: true

重启first_if，但是second_br和second_if仍然是active

$ sudo ip link set first_if up

$ sudo ovs-appctl bond/show
---- bond0 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_br: enabled
        may_enable: true

slave second_br: enabled
        active slave
        may_enable: true

---- bond1 ----
bond_mode: active-backup
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
lacp_status: negotiated

slave first_if: enabled
        may_enable: true

slave second_if: enabled
        active slave
        may_enable: true

如果我们把bond_mode设为balance

$ sudo ovs-vsctl set Port bond0 bond_mode=balance-slb
$ sudo ovs-vsctl set Port bond1 bond_mode=balance-slb

$ sudo ovs-appctl bond/show
---- bond0 ----
bond_mode: balance-slb
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
next rebalance: 3412 ms
lacp_status: negotiated

slave first_br: enabled
        active slave
        may_enable: true

slave second_br: enabled
        may_enable: true

---- bond1 ----
bond_mode: balance-slb
bond-hash-basis: 0
updelay: 0 ms
downdelay: 0 ms
next rebalance: 7415 ms
lacp_status: negotiated

slave first_if: enabled
        active slave
        may_enable: true

slave second_if: enabled
        may_enable: true

这个时候10.10.10.1 ping 10.10.10.3走first_br

$ sudo tcpdump  -n -e -i first_if
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on first_if, link-type EN10MB (Ethernet), capture size 65535 bytes
19:57:04.093878 ca:d4:fd:47:a6:ce > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:57:04.093992 f2:ac:70:72:49:61 > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:57:52.559762 52:54:00:9b:d5:bc > 52:54:00:9b:d5:be, ethertype IPv4 (0x0800), length 98: 10.10.10.1 > 10.10.10.3: ICMP echo request, id 1173, seq 22, length 64
19:57:52.560002 52:54:00:9b:d5:be > 52:54:00:9b:d5:bc, ethertype IPv4 (0x0800), length 98: 10.10.10.3 > 10.10.10.1: ICMP echo reply, id 1173, seq 22, length 64
19:57:53.560999 52:54:00:9b:d5:bc > 52:54:00:9b:d5:be, ethertype IPv4 (0x0800), length 98: 10.10.10.1 > 10.10.10.3: ICMP echo request, id 1173, seq 23, length 64
19:57:53.561278 52:54:00:9b:d5:be > 52:54:00:9b:d5:bc, ethertype IPv4 (0x0800), length 98: 10.10.10.3 > 10.10.10.1: ICMP echo reply, id 1173, seq 23, length 64

而10.10.10.2 ping 10.10.10.4走second_br

$ sudo tcpdump  -n -e -i second_if
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on second_if, link-type EN10MB (Ethernet), capture size 65535 bytes
19:57:03.719596 76:fa:16:61:d7:0e > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:57:03.723928 66:63:74:a9:0e:f2 > 01:80:c2:00:00:02, ethertype Slow Protocols (0x8809), length 124: LACPv1, length 110
19:57:49.695881 52:54:00:9b:d5:bf > 52:54:00:9b:d5:bd, ethertype IPv4 (0x0800), length 98: 10.10.10.4 > 10.10.10.2: ICMP echo reply, id 1154, seq 13, length 64
19:57:50.697434 52:54:00:9b:d5:bd > 52:54:00:9b:d5:bf, ethertype IPv4 (0x0800), length 98: 10.10.10.2 > 10.10.10.4: ICMP echo request, id 1154, seq 14, length 64
19:57:50.697581 52:54:00:9b:d5:bf > 52:54:00:9b:d5:bd, ethertype IPv4 (0x0800), length 98: 10.10.10.4 > 10.10.10.2: ICMP echo reply, id 1154, seq 14, length 64
19:57:51.699024 52:54:00:9b:d5:bd > 52:54:00:9b:d5:bf, ethertype IPv4 (0x0800), length 98: 10.10.10.2 > 10.10.10.4: ICMP echo request, id 1154, seq 15, length 64

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Openvswitch手册(5)

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原文地址：http://www.cnblogs.com/forfuture1978/p/3796744.html