Nexus1000v VSM/VEM communication over Layer3

Over Layer 3 (recommended): Communication between the VSM and the VEM is done through Layer 3, using the management interface of the VSM and a VMkernel interface of the VEM. Layer 3 connectivity mode is the recommended mode.

The Layer 3 mode encapsulates the control and packet frames through User Datagram Protocol (UDP). This process requires configuration of a VMware vmkernel interface on each VMware ESX host, ideally the service console of the VMware ESX server. Using the ESX/ESXi management interface alleviates the need to consume another vmkernel interface for Layer 3 communication and another IP address. Configure the VMware VMkernel interface and attach it to a port profile with the l3control option.

Nexus1000V(config)# port-profile type vethernet L3vmkernel

Nexus1000V(config-port-profile)# switchport mode access

Nexus1000V(config-port-profile)# switchport access vlan <X>

Nexus1000V(config-port-profile)# vmware port-group

Nexus1000V(config-port-profile)# no shutdown

Nexus1000V(config-port-profile)# capability l3control

Nexus1000V(config-port-profile)# system vlan <X>

Nexus1000V(config-port-profile)# state enable

Note: <X> is the VLAN number that will be used by the VMkernel interface.

The l3control configuration sets up the VEM to use this interface to send Layer 3 packets, so even if the Cisco Nexus 1000V Series is a Layer 2 switch, it can send IP packets.

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