Cisco Nexus 1000v
I am writing this blog to mention below key components/terms/definitions related to Nexus 1000v
What is a hypervisor?
Hypervisor is a program that allows multiple OS to share single hardware host
Basic Building Blocks
– It is the control/management plane of 1000v
– Data Plane
Traffic flow with VSM and VEM:
Traffic flow from VEM northbound does not go through VSM.
VEM Virtual Ports
Three types of vNIC in VMWare
1. Virtual NIC
2. vEth port
Represent a port on Nexus 1000v virtual switch.
These ports are assigned to port group.
3. lvEth port
Dynamically selected for vEth ports on the host.
Further, there are 3 types of Virtual NICs.
Part of the VM and represents the physical port of the host which is plugged into the switch
Used by the hypervisor for management,VMotion,iSCSI,NFS and other network access needed by kernel.
VMWare service console network interface, the Service Console network interface.
The vswif interface is used as VMWare management port; these interface types map to a veth port within Nexus 1000v
VSM to VEM Communication
1. Layer 3 Control Mode
VEMs can be in different subnet than the VSM and also from each other in Layer 3 control mode.
Each VEM needs a designated VMkernel NIC interface that is attached to the VEM that communicates with the VSM.
This interface which is called Layer 3 Control vmknic must have a system profile applied to it so the VEM can enable it before contacting the VSM.
2. Layer 2 Control Mode
VEM and VSM are in the same subnet in the Layer 2 control mode.