ACI 模型图
bridge domain
范围
简称bd,一个bd范围可以是以下内容:
- public :可以被fabric外部访问;
- private :只能在本tenant使用;
- share:可以在tenent 内部不同VRF共享,也可以在不同tennat共享;
其他选项
- limit IP Learn To Subnets:只有地址在bd的范围内,才会学习endpoint的IP地址;
- Unicast Routing: fabric :如果使能,并且配置 了subnet ,fabric将会提供默认路由功能,并且会对流量进行路由;该功能同时会引导数据库去学习IP-VTEP的映射。
- Subnet Address:配置默认路由
contracts
定义EPG之间能够通信的流量。contract使用场景包括:
- ACI内部之间EGP通信;
- ACI 内部EGP和外部L2网络之间通信;
- ACI 内部EGP和外部L3网络之间通信;
- 带外管理和带内管理之间网络之间通信;
contract 元素包括label, subject ,filter ,. - label定义了需要通信的EPG,The label match attribute can be one of these values: at least one (the default), all, none, or exactly one.subjet 定义方向,filter定义内容。
选项
- Included EPGs: EPGs can freely communicate with each other without contracts, if they have membership in a contract preferred group. This is based on the source-any-destination-any-permit default rule.
Excluded EPGs: EPGs that are not members of preferred groups require contracts to communicate witheach other. Otherwise, the default source-any-destination-any-deny rule applies.(一般都选exclude)
outside network
通过outside network ,fabric和外部相连