NSX-T Installation Series: Step 20: Configure Route Distribution on T0 (Tier-0) Gateway

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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 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, we followed step-by-step instructions to connect a T1 (Tier-1) Gateway to a T0 (Tier-0) Gateway and validating the learnt routes via command line. This blog is part of the Second Phase i.e. building the logical network topology and the “Step 20” of the NSX-T Installation series, in which we will follow the step-by-step instructions to configure Route Distribution on T0 (Tier-0) Gateway, validate advertised routes and external connectivity via command line.

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

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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):

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.
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With that lets get started…

1. Logon to both Edge Nodes via “admin” credentials and run the commands highlighted in yellow in the image below:

Note: get bgp neighbor 192.168.110.1 advertised-routes shows only the default route and none of the overlay segment subnets.

2. Go to NSX-T Manager UI, Click Networking -> Tier-0 Gateways -> Click the three dots (and Edit), expand “ROUTE RE-DISTRIBUTION”, click “Set”:

3. Check the box next to “Static Routes”, “Connected Interfaces & Segments” under Tier-0 Subnets; “Connected Subnets” under Advertised Tier-1 Subnets, click Apply:

4. Click SAVE and CLOSE EDITING:

Ok, lets validate the configuration now:

1. Go back to the Edge Nodes, run the same commands as before (highlighted in yellow in the image below):

Note: get bgp neighbor 192.168.110.1 advertised-routes shows all of the overlay segment subnets.

2. Ping from an “External Client” which is on the physical network (connected to the ToR switch) as shown in the screenshot below, to the Overlay VMs:

3. If you get a response, that confirms the ingress connectivity i.e. External Client to Overlay VMs:

4. You could also confirm egress connectivity i.e. Overlay VMs to External Client:

That concludes the last step of the Second Phase.

Congratulations! you have now successfully completed the NSX-T Installation series. I commend your efforts of spending valuable time in getting your hands dirty with NSX-T Datacenter.

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