Layer 3 Mode; Data Virtual Machine Cluster; Management, Live Migration, And Cluster Traffic - Cisco Nexus 1000V Deployment Manual

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You should use Cisco NX-OS high-availability mode to help ensure availability of the VSM virtual machine. When

the active VSM or the Microsoft Hyper-V host that is running the active VSM goes down, the standby VSM

becomes active. For additional information about VSM high availability, please refer to Cisco Nexus 1000V high-

availability and redundancy documentation.

Because Cisco NX-OS high-availability mode is used to help ensure high availability of the VSM, deployment of

the VSM virtual machine on standalone Microsoft Hyper-V hosts is preferred. If the VSM virtual machine is

deployed in a failover cluster, then the VSM virtual machines must not be made highly available; otherwise, VSM

failover may not occur smoothly.

Layer 3 Mode

Cisco Nexus 1000V supports on Layer 3 communication between the VSM and the VEMs (Cisco Nexus 1000V

Switches for Microsoft Hyper-V on Microsoft Hyper-V hosts): that is, IP traffic is used for VSM-to-VEM

communication. VSM-to-VEM communication flows between the management interface on the Cisco Nexus

1000V VSM and the Microsoft Hyper-V host management interfaces. Because the control traffic between the VSM

and the VEM is based on Layer 3 IP packets, the VEM and the VSMs can be in different IP subnets. VLANs and

IP routing must be configured correctly on the physical routers and switches to help ensure VSM-to-VEM

communication.

The Cisco Nexus 1000V Logical Switch must be created only on Microsoft Hyper-V hosts that run workload virtual

machines. As shown earlier in Figure 29, the Cisco Nexus 1000V Logical Switch (VEM) is not created on

infrastructure hosts and is created only on workload hosts.

Microsoft recommends that critical traffic such as host management, storage (Small Computer System Interface

over IP [iSCSI]), live migration, and cluster traffic use the pNIC on a Microsoft Hyper-V host for reliability and

performance. On the basis of this recommendation, use the Cisco Nexus 1000V Logical Switch only for workload

virtual machines, and flowing infrastructure traffic directly to the pNIC.

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