vDCA550-Objective 2.1-1-Create and Manage vSS components -(Part 1)

There are four major components of the Virtual Standard Switch (vSS)

Virtual Switch

A virtual switch (vSwitch) is a software application that allows communication between virtual machines and with the outside world. It’s embedded at hypervisor layer. By default, each ESXi host has a single virtual switch called “vSwitch0”.The default number of logical ports for a vSwitch is “120” but it can have more ports. Each port can connect to a network adapter of a virtual machine, or an uplink adapter on the physical machine.

You can see all the virtual Switch of an ESXi host from “WebClient-> ESXi host -> Manage-> Networking-> Virtual Switch



A ‘Port Group’ is a group of ports on a vSwitch. Every port group has name which is called as network label.it is unique to the current host. Network labels make virtual machine configuration portable across hosts you can use a VLAN ID to restrict port group traffic to a logical Ethernet segment within the physical network. Each ESXi host must have a PG assign to it. The default PG with the default vSwitch0 is with name “VM Network”.

There are two type of port groups

  1. Virtual Machine traffic port group
  2. vKernel port group

1-VM traffic PortGroup.

Use for virtual machine traffic and connectivity.

You can see all the VM Portgroup of a Virtual Switch. From WebClient-> Select the ESXi hosts -> Manage-> Networking-> Virtual Switch -> Select a Virtual Switch. A topology diagram will show and VM port group are highlighted in the diagram as shown below.


2-vKernel PortGroup

The VMkernel TCP/IP stack handles traffic for ESXi services such as vSphere vMotion, iSCSI, NFS, FCoE, Fault Tolerance, Virtual SAN and host management.

You can see all the vKernel Port of defined on an ESXi host at Virtual Switch Level. From “WebClient->Select the ESXi hosts -> Manage -> Networking-> vMKernel Adapters”


3-Virtual Network adapter (vmnic)

The virtual network adapter is an object that is linked to the physical NIC and used to provide connectivity between the vSwitch and the physical switch via the physical NIC. Virtual network adapter (vmnic) also provides connectivity between the virtual guest operating system and the vSwitch.

You can find all the virtual adapter associated to a Virtual Machine by going into the “VM Settings” -> In “Virtual Machine” Tab as highlighted below.


4-Physical Network Adapter (pnic)

Every virtual switch has one or more physical network adapters which is used as uplink to connect the virtual network with the physical network. Uplink adapters use virtual objects called vmnics, or virtual network adapters, to interface with the vSwitch.

You can find all of the physical adapter that is available to an ESXi hosts. “From Web Client-> ESXi Manage-> Networking-> Physical adapters” list.



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