To setup the VXLAN in the Nexus 1000v, just follow this Cisco guide.

Configuration steps as follows:

Step 1. Enable the VXLAN Feature

feature segmentation

Note that don’t be confused with the Cisco’s example. Though it just mentions to turn on the segmentation feature, the show feature output also display the network-segmentation feature. So I also turn the later on, that is a MISTAKE! As I find out that if the network-segmentation feature is on, the VEM will never send out multicast packets. It waste me almost a day to figure out the problem.

Step 2. Configure the Default Mode
no segment mode unicast-only

Step 3. Configure the VTEP Port-Profile

For the VTEP VLAN, as I will configure the VTEP address (10.10.1.68) inside the subnet of my local PC, and recall that my ESX’s NIC actually bridge to my local PC, thus I use VLAN 1 (which is the native VLAN).
The VNID (VXLAN ID) to be used is 5000 with multicast group 225.1.1.1 (default Cisco UDP port 8472).

port-profile type vethernet VTEP
  vmware port-group
  switchport mode access
  switchport access vlan 1
  capability vxlan
  no shutdown
  state enabled

Step 4. Create the VTEP VMKernel Interfaces (under vCenter)

Note that in my environment, it requires to "shut" and "no shut" the corresponding VTEP interface in the VSM to make it works.

Step 5. Create the Bridge Domain

bridge-domain 10.20.1..x
  segment id 5000
  group 225.1.1.1

Step 6. Create the VXLAN Port-Profile for VMs
Port-profile type vethernet vxlan-10.20.1.x
  vmware port-group
  switchport mode access
  switchport access bridge-domain 10.20.1.x
  no shutdown
  state enabled

Step 7. Assign the VXLAN Port-Profile to VMs (under vCenter)

The NICs of the 2 different DSL VMs (with IP address 10.20.1.101 and 10.20.1.102 respectively) are changed to use the VXLAN portgroup.

Now I can ping between the 2 different VMs.

Now to bridge my loopback interface (with IP address 10.20.1.63) of my local PC to the VXLAN, I need to execute the Ubridge tool. (The next blog entry explains more detail about the UBridge configuration). My PC’s local NIC card uses IP address 10.10.1.63 which will be the VTEP address, execute the Ubridge as follow:

c:\> ubdg.bat 5000#W:E 5000#V:E@10.10.1.63:225.1.1.1

Now I can ping between my loopback interface and the 2 VM’s IP address.  

In this blog entry, I want to discuss how to use the open source tool UBridge to directly bridge the Windows PC to the VXLAN without using any VXLAN gateway.

UBridge is like the vSwitch inside the ESX, but UBridge is open source and can directly execute under the Windows command prompt. It’s now available inside the IPtools package, click here to download.You don’t need to even install it, all you need is to install the Winpcap.

To setup the VXLAN testing environment, you need to have at least one ESX server, vCenter server (while I use the Linux version) and vCenter client software.
I use the Cisco Nexus 1000v to configure the vDS for the VXLAN. Yes, I use Nexus instead of NSX. Honestly, I’m not a VMware guy, I am more familiar with the Cisco technology, also I’ve already have the N1K environment for testing.

The followings are software versions that being used:

•     ESXi: 5.5.0 (VMkernel release build 1623387)
•     vCenter: Server Appliance 5.5.0.10000-1624811
•     VSM:nexus-1000v.4.2.1.SV2.2.2.bin
•     VEM: Cisco_bootbank_cisco-vem-v160-esx_4.2.1.2.2.2.0-3.2.1.vib

For the minimal hardware requirement, I used VMware workstation in my local PC, and install the ESX as a guest VM, bridge the ESX NIC as my local PC’s NIC. Likewise, the vCenter server is also a guest VM of the VMware workstation.
I created 2 smallest VMs inside the ESX by using the DSL linux image.
Then setup the Nexus 1000v into the VMware infrastructure, which is a long journey and not the focus of this blog, please refer to the corresponding documentation (or can hire me!).
Following figures shows the ESX configuration:

You don't actutally needs the VSG which is for my other testing.

Now, to setup the VXLAN in the Nexus 1000v, please following this next blog entry.