Attaching a Tier-1 Gateway to Tier-0 Gateway in NSX-T 2.4

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When it comes to a multi-tier router architecture you will be connecting Tier-1 router(s) to an existing Tier-0 router. East-West routing is performed by the DR (distributed Router) in the Tier-1 router.  The Tier-0 provides services and external connectivity. 

Some things to be aware of:

  • When the service and distributed routers are created, they are interconnected through the router-link port between them.
  • Each tier-0-to-tier-1 peer connection is provided a /31 subnet within the 100.64.0.0/10 reserved address space (RFC6598).
  • When a Tier-1 Gateway is connected to Tier-0 Gateway the management plane configures a default route on T1 with next hop IP address as Routerlink IP of T0 (100.64.128.0/31)
  • To provide reachability to subnets connected to the T1 Gateway the Management Plane configures static routes on the T0 Gateway for all the LIFs connected to T1 with a next hop IP address as T1 Routerlink IP (100.64.128.1)

A tiered architecture has the following features and functions:

  • Supports tenant isolation
  • Includes separate controls for different admin domains
  • Eliminated physical dependency when new tenants are introduced.

Step 1.  Edit your existing T1 Router

Networking>Tier-1 Gateway

—Edit existing T1

Step 2. Click the drop down under Linked Tier-0 Gateway & select your existing T0 router.

Save>close editing

Step 3. Verify connectivity by performing ping tests

Summary
As you can see above the 3 segments tied to our T1 is now seen as linked allowing them access beyond their own T1.  Linking a T1 to a T2 is a simple process and isn’t very complicated.  I hope this article helps simplify the process.

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