前言

odl-neutron是与openstack对接的北向模块，通过抓包分析openstack下发至odl-neutron的北向数据，可以大致了解到neutron的北向模型，以及各种请求的基本数据，便于我们进一步学习odl-netvirt代码，同时对于neutron的业务创建逻辑有一个更清楚的理解,特别是网络、子网、虚拟机、路由器这些创建过程，openstack neutron到底做了什么？基于这个疑问，将总结如下。

1 抓包过滤条件

• 过滤ip和http
  http.request.method&& ip.src10.0.0.12 && ip.dst10.0.0.12

• 过滤非get rest接口
  http&&http.request.method!=GET && ip.src10.0.0.12 && ip.dst10.0.0.12

• 过滤uri—最优推荐
  http.request.uri matches “/controller/nb/v2/neutron/.*”
  http.request.uri contains “/controller/nb/v2/neutron”

  帮助信息：

  a-点击右侧过滤按键
  b-搜索search找到相关过滤规则名
  c-在Relation找到匹配条件表达式，
  这里通常包含“==”、“！=”、“>=”、“<=”、“contains”、“matches”等表达式条件；
  d-在vlaue栏目中填入具体匹配条件，这里支持正则表达式选项；
  e-点击ok则可以在相应位置生成相关信息；

2 抓包过程总体分析

包含流程：

a.创建网络--network POSTb.创建子网--subnet POSTc.dhcp端口添加--ports POST\\ports PUTd.vm创建--ports POST\\port PUT\\port PUTc.创建路由--router POSTd.创建路由接口--ports POST\\port PUT

3 网络创建

network抓包描述：

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/networks][HTTP request 1/2][Response in frame: 28214][Next request in frame: 28722]File Data: 801 bytes
JavaScript Object Notation: application/json
/*ObjectMember Key: networkObjectMember Key: provider:physical_networkNull valueKey: provider:physical_networkMember Key: ipv6_address_scopeNull valueKey: ipv6_address_scopeMember Key: revision_numberNumber value: 2Key: revision_numberMember Key: port_security_enabledTrue valueKey: port_security_enabledMember Key: provider:network_typeString value: vxlanKey: provider:network_typeMember Key: idString value: 25601711-79ca-46aa-9a95-fbb02676cb4dKey: idMember Key: router:externalFalse valueKey: router:externalMember Key: availability_zone_hintsArrayKey: availability_zone_hintsMember Key: availability_zonesArrayKey: availability_zonesMember Key: ipv4_address_scopeNull valueKey: ipv4_address_scopeMember Key: sharedFalse valueKey: sharedMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: updated_atString value: 2018-09-04T03:06:23ZKey: updated_atMember Key: is_defaultFalse valueKey: is_defaultMember Key: provider:segmentation_idNumber value: 59Key: provider:segmentation_idMember Key: nameString value: network2Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: created_atString value: 2018-09-04T03:06:23ZKey: created_atMember Key: mtuNumber value: 1450Key: mtuMember Key: vlan_transparentNull valueKey: vlan_transparentKey: network*/

4 子网创建+使能DHCP

4.1 subnet add

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/subnets][HTTP request 2/2][Prev request in frame: 28205][Response in frame: 29017]File Data: 807 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: subnetObjectMember Key: updated_atString value: 2018-09-04T03:06:24ZKey: updated_atMember Key: ipv6_ra_modeNull valueKey: ipv6_ra_modeMember Key: allocation_poolsArrayObjectMember Key: startString value: 192.168.222.10Key: startMember Key: endString value: 192.168.222.15Key: endKey: allocation_poolsMember Key: host_routesArrayKey: host_routesMember Key: revision_numberNumber value: 0Key: revision_numberMember Key: ipv6_address_modeNull valueKey: ipv6_address_modeMember Key: idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: idMember Key: dns_nameserversArrayKey: dns_nameserversMember Key: gateway_ipString value: 192.168.222.1Key: gateway_ipMember Key: sharedFalse valueKey: sharedMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: cidrString value: 192.168.222.0/24Key: cidrMember Key: service_typesArrayKey: service_typesMember Key: nameString value: sub2Key: nameMember Key: enable_dhcpTrue valueKey: enable_dhcpMember Key: network_idString value: 25601711-79ca-46aa-9a95-fbb02676cb4dKey: network_idMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: created_atString value: 2018-09-04T03:06:24ZKey: created_atMember Key: ip_versionNumber value: 4Key: ip_versionKey: subnet

4.2 dhcp port add

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports][HTTP request 1/2][Response in frame: 31441][Next request in frame: 31636]File Data: 868 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: binding:host_idString value: host-1Key: binding:host_idMember Key: nameString value: Key: nameMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: network_idString value: 25601711-79ca-46aa-9a95-fbb02676cb4dKey: network_idMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: device_ownerString value: network:dhcpKey: device_ownerMember Key: mac_addressString value: fa:16:3e:66:d4:bdKey: mac_addressMember Key: binding:profileObjectKey: binding:profileMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.10Key: ip_addressKey: fixed_ipsMember Key: idString value: 4ce3dff2-f710-4108-af92-48207a5ab42cKey: idMember Key: security_groupsArrayKey: security_groupsMember Key: device_idString value: dhcpf72400a4-a35a-5d17-b5ce-25036ebf0bbc-25601711-79ca-46aa-9a95-fbb02676cb4dKey: device_idKey: port

4.3 dhcp port update

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports/4ce3dff2-f710-4108-af92-48207a5ab42c][HTTP request 2/2][Prev request in frame: 31091][Response in frame: 31681]File Data: 858 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: extra_dhcp_optsArrayKey: extra_dhcp_optsMember Key: updated_atString value: 2018-09-04T03:06:25ZKey: updated_atMember Key: device_ownerString value: network:dhcpKey: device_ownerMember Key: revision_numberNumber value: 3Key: revision_numberMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: binding:profileObjectKey: binding:profileMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.10Key: ip_addressKey: fixed_ipsMember Key: security_groupsArrayKey: security_groupsMember Key: binding:vif_detailsObjectMember Key: port_filterTrue valueKey: port_filterKey: binding:vif_detailsMember Key: binding:vif_typeString value: ovsKey: binding:vif_typeMember Key: mac_addressString value: fa:16:3e:66:d4:bdKey: mac_addressMember Key: binding:host_idString value: host-1Key: binding:host_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: device_idString value: dhcpf72400a4-a35a-5d17-b5ce-25036ebf0bbc-25601711-79ca-46aa-9a95-fbb02676cb4dKey: device_idMember Key: nameString value: Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: created_atString value: 2018-09-04T03:06:24ZKey: created_atMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeKey: port

5 vm增加

第一次更新操作填入device_owner: compute:host-2

更新还加入vir_details\vif__type\mac_address\tags等信息

第二次更新主要为vif_type变化由unbound---->ovs

5.1 vm端口增加

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports][HTTP request 9/15][Prev request in frame: 12261][Response in frame: 50560][Next request in frame: 51786]File Data: 882 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: port_security_enabledTrue valueKey: port_security_enabledMember Key: binding:host_idString value: Key: binding:host_idMember Key: nameString value: Key: nameMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: network_idString value: 25601711-79ca-46aa-9a95-fbb02676cb4dKey: network_idMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: device_ownerString value: Key: device_ownerMember Key: mac_addressString value: fa:16:3e:2b:ff:a6Key: mac_addressMember Key: binding:profileObjectKey: binding:profileMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.11Key: ip_addressKey: fixed_ipsMember Key: idString value: 86f838a8-e224-404a-9858-8b2f1c2a4667Key: idMember Key: security_groupsArrayObjectMember Key: idString value: ffa53b72-48c3-4f0b-93da-ff9ee2f8e795Key: idKey: security_groupsMember Key: device_idString value: 125c628e-5885-431e-86f0-c3fa713e0aeaKey: device_idKey: port

5.2 vm端口更新1

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports/86f838a8-e224-404a-9858-8b2f1c2a4667][HTTP request 10/15][Prev request in frame: 50549][Response in frame: 51825][Next request in frame: 52764]File Data: 865 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: extra_dhcp_optsArrayKey: extra_dhcp_optsMember Key: updated_atString value: 2018-09-04T03:07:06ZKey: updated_atMember Key: device_ownerString value: compute:host-2Key: device_ownerMember Key: revision_numberNumber value: 4Key: revision_numberMember Key: binding:profileObjectKey: binding:profileMember Key: port_security_enabledTrue valueKey: port_security_enabledMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.11Key: ip_addressKey: fixed_ipsMember Key: security_groupsArrayObjectMember Key: idString value: ffa53b72-48c3-4f0b-93da-ff9ee2f8e795Key: idKey: security_groupsMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: mac_addressString value: fa:16:3e:2b:ff:a6Key: mac_addressMember Key: binding:host_idString value: host-2Key: binding:host_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: device_idString value: 125c628e-5885-431e-86f0-c3fa713e0aeaKey: device_idMember Key: nameString value: Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: created_atString value: 2018-09-04T03:07:05ZKey: created_atMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeKey: port

5.3 vm端口更新2

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports/86f838a8-e224-404a-9858-8b2f1c2a4667][HTTP request 11/15][Prev request in frame: 51786][Response in frame: 52781][Next request in frame: 61762]File Data: 892 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: extra_dhcp_optsArrayKey: extra_dhcp_optsMember Key: updated_atString value: 2018-09-04T03:07:06ZKey: updated_atMember Key: device_ownerString value: compute:host-2Key: device_ownerMember Key: revision_numberNumber value: 4Key: revision_numberMember Key: port_security_enabledTrue valueKey: port_security_enabledMember Key: binding:profileObjectKey: binding:profileMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.11Key: ip_addressKey: fixed_ipsMember Key: security_groupsArrayObjectMember Key: idString value: ffa53b72-48c3-4f0b-93da-ff9ee2f8e795Key: idKey: security_groupsMember Key: binding:vif_detailsObjectMember Key: port_filterTrue valueKey: port_filterKey: binding:vif_detailsMember Key: binding:vif_typeString value: ovsKey: binding:vif_typeMember Key: mac_addressString value: fa:16:3e:2b:ff:a6Key: mac_addressMember Key: binding:host_idString value: host-2Key: binding:host_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: device_idString value: 125c628e-5885-431e-86f0-c3fa713e0aeaKey: device_idMember Key: nameString value: Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: created_atString value: 2018-09-04T03:07:05ZKey: created_atMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeKey: port

6 路由增加

端口更新加入vir_details\vif__type\mac_address\tags等信息

接口加入时候填入:router_interface

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/routers][HTTP request 1/1][Response in frame: 55128]File Data: 592 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: routerObjectMember Key: statusString value: ACTIVEKey: statusMember Key: external_gateway_infoNull valueKey: external_gateway_infoMember Key: availability_zone_hintsArrayKey: availability_zone_hintsMember Key: haFalse valueKey: haMember Key: ha_vr_idNumber value: 0Key: ha_vr_idMember Key: descriptionString value: Key: descriptionMember Key: gw_port_idNull valueKey: gw_port_idMember Key: tagsArrayKey: tagsMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: created_atString value: 2018-09-04T03:07:13ZKey: created_atMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: distributedFalse valueKey: distributedMember Key: updated_atString value: 2018-09-04T03:07:13ZKey: updated_atMember Key: revision_numberNumber value: 0Key: revision_numberMember Key: routesArrayKey: routesMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: idString value: e785315f-965d-478e-9ca5-c7df70f73feeKey: idMember Key: nameString value: router1Key: nameKey: router

7 路由接口关联

端口更新加入vir_details\vif__type\mac_address\tags等信息

接口加入时候填入:router_interface

7.1 接口1增加

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports][HTTP request 12/15][Prev request in frame: 52764][Response in frame: 61792][Next request in frame: 62505]File Data: 832 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: binding:host_idString value: Key: binding:host_idMember Key: nameString value: Key: nameMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: network_idString value: 25601711-79ca-46aa-9a95-fbb02676cb4dKey: network_idMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: device_ownerString value: network:router_interfaceKey: device_ownerMember Key: mac_addressString value: fa:16:3e:d3:1e:8cKey: mac_addressMember Key: binding:profileObjectKey: binding:profileMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.1Key: ip_addressKey: fixed_ipsMember Key: idString value: b75ee163-5c54-4d1c-87b6-a7d7fa2d2214Key: idMember Key: security_groupsArrayKey: security_groupsMember Key: device_idString value: e785315f-965d-478e-9ca5-c7df70f73feeKey: device_idKey: port

7.2 接口1更新

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports/b75ee163-5c54-4d1c-87b6-a7d7fa2d2214][HTTP request 13/15][Prev request in frame: 61762][Response in frame: 62595][Next request in frame: 65846]File Data: 795 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: extra_dhcp_optsArrayKey: extra_dhcp_optsMember Key: updated_atString value: 2018-09-04T03:07:33ZKey: updated_atMember Key: device_ownerString value: network:router_interfaceKey: device_ownerMember Key: revision_numberNumber value: 4Key: revision_numberMember Key: binding:profileObjectKey: binding:profileMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 091a0a7c-60d8-4b55-be54-5d28e7cdfedbKey: subnet_idMember Key: ip_addressString value: 192.168.222.1Key: ip_addressKey: fixed_ipsMember Key: security_groupsArrayKey: security_groupsMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: mac_addressString value: fa:16:3e:d3:1e:8cKey: mac_addressMember Key: binding:host_idString value: Key: binding:host_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: device_idString value: e785315f-965d-478e-9ca5-c7df70f73feeKey: device_idMember Key: nameString value: Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: created_atString value: 2018-09-04T03:07:32ZKey: created_atMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeKey: port

接口2增加

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports][HTTP request 14/15][Prev request in frame: 62505][Response in frame: 65948][Next request in frame: 66623]File Data: 831 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: binding:host_idString value: Key: binding:host_idMember Key: nameString value: Key: nameMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: network_idString value: 96c95d81-cbef-442e-a1d3-bfd5f6266231Key: network_idMember Key: tenant_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: tenant_idMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: device_ownerString value: network:router_interfaceKey: device_ownerMember Key: mac_addressString value: fa:16:3e:3f:9b:f0Key: mac_addressMember Key: binding:profileObjectKey: binding:profileMember Key: project_idString value: b24f2b656ff24fd3aaab3a24a09dc3d6Key: project_idMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 96d6c365-6582-4dbf-a26b-74a0f3bf106fKey: subnet_idMember Key: ip_addressString value: 192.168.11.1Key: ip_addressKey: fixed_ipsMember Key: idString value: 40eb7085-2d3b-4c4e-8b00-cb658b6ce62eKey: idMember Key: security_groupsArrayKey: security_groupsMember Key: device_idString value: e785315f-965d-478e-9ca5-c7df70f73feeKey: device_idKey: port

接口2更新

    [Full request URI: http://10.0.0.12:8181/controller/nb/v2/neutron/ports/40eb7085-2d3b-4c4e-8b00-cb658b6ce62e][HTTP request 15/15][Prev request in frame: 65846][Response in frame: 66637]File Data: 794 bytes
/*
JavaScript Object Notation: application/jsonObjectMember Key: portObjectMember Key: allowed_address_pairsArrayKey: allowed_address_pairsMember Key: extra_dhcp_optsArrayKey: extra_dhcp_optsMember Key: updated_atString value: 2018-09-04T03:07:43ZKey: updated_atMember Key: device_ownerString value: network:router_interfaceKey: device_ownerMember Key: revision_numberNumber value: 4Key: revision_numberMember Key: binding:profileObjectKey: binding:profileMember Key: port_security_enabledFalse valueKey: port_security_enabledMember Key: fixed_ipsArrayObjectMember Key: subnet_idString value: 96d6c365-6582-4dbf-a26b-74a0f3bf106fKey: subnet_idMember Key: ip_addressString value: 192.168.11.1Key: ip_addressKey: fixed_ipsMember Key: security_groupsArrayKey: security_groupsMember Key: binding:vif_detailsObjectKey: binding:vif_detailsMember Key: binding:vif_typeString value: unboundKey: binding:vif_typeMember Key: mac_addressString value: fa:16:3e:3f:9b:f0Key: mac_addressMember Key: binding:host_idString value: Key: binding:host_idMember Key: descriptionString value: Key: descriptionMember Key: tagsArrayKey: tagsMember Key: device_idString value: e785315f-965d-478e-9ca5-c7df70f73feeKey: device_idMember Key: nameString value: Key: nameMember Key: admin_state_upTrue valueKey: admin_state_upMember Key: created_atString value: 2018-09-04T03:07:42ZKey: created_atMember Key: binding:vnic_typeString value: normalKey: binding:vnic_typeKey: port

8 总结

8.1 device-owner总结

network:dhcp

router_interface

compute:host-2

8.2 细节分析

• 创建网络子网，并不会产生端口，使能ｄｈｃｐ会增加相关dhcp接口，不管在openstack原生环境，还是odl环境都是如此；
• 创建虚机会在ｏｖｓ下发相关端口，从北向分析可知，会有两次更新端口更新事件，相关端口device-owner归属在更新事件中确定。

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