NSX-T Installation Series: Step 14 – Create Overlay Segments

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The steps 1 to 12 of this NSX-T Installation series focused on the setup of the NSX-T Datacenter components i.e.  NSX-T Management Cluster, Host and Edge Transport Nodes. From, Step 13 onwards, the focus shifted to building the logical network topology that I alluded to in Step 0 – High Level Design.

Links to all the steps of the Second Phase for quick jump:

The previous step, discussed T1 (Tier-1) Gateway, its considerations, SR (Service Router), DR (Distributed Router), followed by step-by-step instructions on how to create one. This blog is part of the Second Phase i.e. building the logical network topology and “Step 14” of the NSX-T Installation series, where we will discuss Overlay Segments and step-by-step instructions on how to configure one.

The image below highlights the logical entity of the “Routing Design” this step focuses on:

But before we proceed, I would encourage you to briefly skim through my other blogs below, which you may find useful for this step:

  1. NSX-T Architecture (Revamped)for v2.4 and later
  2. Series Overview: Step 0 – High Level Design
  3. Preceding Step (Pre-requisites): Step 13 – Create T1 (Tier-1) Gateway

It is assumed that you have NSX-T Management Cluster deployed, Host and Edge Transport Nodes configured and ready to use. If not, please refer the steps 1 to 12 in this NSX-T Installation series for guidance.

If you are deploying this in your home lab or performing a PoC in a nested vSphere Environment, I would also suggest you have a quick glance of my blog Home Lab Setup – Nested ESXi Host’s networking for NSX-T.

A Segment performs the functions of a logical switch and connects to gateways and VMs. Like the Tier-1 Gateway, a Segment has different naming references: “Segment” in the Simplified UI (Policy UI) and logical switch in the Advance UI (Manager UI).

Depending upon the “Transport Zone” (selected while creating a segment), a vLAN or Overlay segment is instantiated.

Note: An N-VDS switch configured in the Enhanced Datapath mode supports IP Discovery, SpoofGuard and IPFIX profiles.

With that lets get started…

1. Click Networking -> Segments -> ADD SEGMENT:

2. Specify the name as Web-A-11, Uplink as T1-GW-A-11 (created in previous step), select the Transport Zone as TZ-STD-OVERLAY-11 (created in Step – 6) and click “Set-Subnets”:

3. Click ADD SUBNET -> Specify the Gateway as and click “ADD”:

4. Click “Apply”:

5. Click Save:

6. Click “No”, when prompted for continuing to configure the segment:

7. Confirm the status showing “Up”, as shown in the screenshot below:

Follow the same steps to create APP-A-11 and DB-A-11, as shown in the screenshot below:

You could also logon to the vCenter to visualize the segments just created:

This concludes this step of creating overlay segments successfully.

Let’s proceed ahead with the next blog in this series Step 15 (Option 1) – Migrate VM(s) from vDS to N-VDS.

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