第四部分
cisco nexus 1000v介绍
cisco nexus 1000v介绍
nexus 1000v是cisco出产的第三方虚拟分布式交换机,它由两大组件组成:
the virtual supervisor module(vsm)-the control plane of the switch and a virtual machine that runs nx-os(引擎模块)
the virtual ethernet module(vem)-a virtual line card embedded in each vmware vsphere(esx) host.the vem is partly inside the kernel of the hypervisor and partly in a user world process,called the vem agent.(以太网接口模块)
cisco nexus 1000v示意图
cisco nexus 1000v把流量分为3个vlan
mangement vlan
the management vlan is used for system login,configuration.and corresponds to the mgmt0 interface.the management interface appears as the mgmt0 port on a cisco switch,and is assigned an ip address.although the management interface is not used to exchange data between the vsm and vem,is not used to exchange data between the vsm and vem,it is used to establish and maintain the connection between the vsm and vmware vcenter server.
the management interface is always the second interface on the vsm and is usually labeled network adapter 2 in the virtual machine network properties.(为了系统登录和配置,管理接口叫mgmt0,配置管理ip地址,建立和维护连接vsm和vcenter连接,它往往是3个接口卡的第二个接口)
packet vlan
the control vlan and the packet vlan are used for communication between the vsm and the vems within a switch domain.the vlans are used as follows;
the packet vlan is used by protocols such as cdp,lacp,and igmp.
the third e1000 network adapter connects to a vlan created for nexus packet traffic(用来在vsm和vem之间通信cdp,lacp,igmp,它往往是3个接口的第三个)
control vlan(控制vlan)
the control vlan is used for the following:
vsm configuration commands to each vem,and their responses
vem notifications to the vsm,for example a vem notifies the vsm of the attachment or detachment of ports to the dvs
vem netflow exports are sent to the vsm,where they are then forwarded to a netflow collector.
the first e1000 network adapter connects to a vlan created for nexus packet traffic(vsm配置命令道vem,vem通告vsm增加port到分布式交换机,vem netflow导出会发送到vsm,这样它能够发送netflow到收集器,control vlan往往是3个接口的第一个)
