OpenStack Tacker介绍 - 9.tacker VNFFGD模板介绍

1、说明

    本文描述VNFFGD模板的结构以及基于"V1.0 CSD 03"要求的各个组成部分的字段。
    V1.0 CSD 03:http://docs.oasis-open.org/tosca/tosca-nfv/v1.0/tosca-nfv-v1.0.html

    每一个VNFFGD的yaml文件模板都有以下部分:

tosca_definitions_version:
   This defines the TOSCA definition version on which the template is based.
   The current version being tosca_simple_profile_for_nfv_1_0_0.

tosca_default_namespace:
   This is optional. It mentions default namespace which includes schema,
   types version etc.

description:
   A short description about the template.

metadata:
   template_name: A name to be given to the template.

topology_template:
   Describes the topology of the VNFFG under node_template field.
   node_template:
       Describes node types of a VNFFG.
       FP:
           Describes properties and path of a Forwarding Path.
   groups:
       Describes groupings of nodes that have an implied relationship.
       VNFFG:
           Describes properties and members of a VNF Forwarding Graph.

2、Forwarding Path

    VNFFGD定义了一条链路中所有VNFs的流量转发图。
    type:       tosca.nodes.nfv.FP.Tacker
    properties: 定义FP的属性,包括 id(path id必须唯一),策略以及流量在每个端口的定义。

2.1 指定FP属性

    一个FP模板如下,当前只支持一条FP:

node_templates:

  Forwarding_path1:
    type: tosca.nodes.nfv.FP.Tacker
    description: creates path (CP11->CP12->CP32)
    properties:
      id: 51
      policy:
        type: ACL
        criteria:
          - network_src_port_id: 640dfd77-c92b-45a3-b8fc-22712de480e1
          - destination_port_range: 80-1024
          - ip_proto: 6
          - ip_dst_prefix: 192.168.1.2/24
      path:
        - forwarder: VNF1
          capability: CP1
        - forwarder: VNF2
          capability: CP2
id:用于唯一标识一条路径。
    这个ID后期将会用于通过设置SPI(Service Path Identifier)的属性
    NSH(Network Service Header)来实现唯一路径的确定。
policy: 定义流量的匹配规则
    当前只支持ACL(access control list)。
path:定义数据的流向
    当VNFD设置了多个CP的时候,第一个默认为入口,第二个默认为出口。
    当只有一个CP的时候,第一个网卡既为入口又为出口。

3、Group

    用于定义VNFFG,并且只能定义一个。

4、VNFFG

    VNFFG中定义着转发图中的资源。
    type:        tosca.groups.nfv.VNFFG
     properties: 定义VNFFG的属性,包括vendor, version, dependent_virtual_link, connection_points, constituent_vnfs.
     members:    定义当前VNFFG的FP. 当前只支持一个.
例子如下:

groups:
  VNFFG1:
    type: tosca.groups.nfv.VNFFG
    description: HTTP to Corporate Net
    properties:
      vendor: tacker
      version: 1.0
      number_of_endpoints: 2
      dependent_virtual_link: [VL1,VL2,VL3]
      connection_point: [CP1,CP2]
      constituent_vnfs: [VNF1,VNF2]
    members: [Forwarding_path1]
number_of_endpoints:CP的个数
dependent_virtual_link:VNFFG用到的VL列表
connection_point:VNFFG用到的CP列表
constituent_vnfs:VNFFG用到的VNFD列表

5、小结

    一个全量的VNFFGD定义如下:

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tosca_definitions_version: tosca_simple_profile_for_nfv_1_0_0

description: Sample VNFFG template

topology_template:
  description: Sample VNFFG template

  node_templates:

    Forwarding_path1:
      type: tosca.nodes.nfv.FP.Tacker
      description: creates path (CP12->CP22)
      properties:
        id: 51
        policy:
          type: ACL
          criteria:
            - network_src_port_id: 640dfd77-c92b-45a3-b8fc-22712de480e1
            - destination_port_range: 80-1024
            - ip_proto: 6
            - ip_dst_prefix: 192.168.1.2/24
        path:
          - forwarder: VNFD1
            capability: CP12
          - forwarder: VNFD2
            capability: CP22

  groups:
    VNFFG1:
      type: tosca.groups.nfv.VNFFG
      description: HTTP to Corporate Net
      properties:
        vendor: tacker
        version: 1.0
        number_of_endpoints: 2
        dependent_virtual_link: [VL12,VL22]
        connection_point: [CP12,CP22]
        constituent_vnfs: [VNFD1,VNFD2]
      members: [Forwarding_path1]

6、参考文档

https://docs.openstack.org/tacker/latest/contributor/vnffgd_template_description.html

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转载自blog.csdn.net/linshenyuan1213/article/details/78226241