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AndrewCirel
Enthusiast
Enthusiast

VCF Edge Cluster Deployment requires two separate VLANs for the internet uplinks

Can someone please explain the design decision why the VCF Edge Cluster Deployment requires two separate VLANs/subnets for the internet uplinks?

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shank89
Expert
Expert

The Edge cluster deployment in SDDC Manager / VCF deploys two NSX-T Edge VMs, creates an Edge cluster, Tier-0 and Tier-1 gateway.

Two uplink VLANs to the physical network allows for multipathing to the physical fabric (ECMP) from the Tier-0 / Edge nodes.  The first image in this post may assist you https://www.lab2prod.com.au/2022/05/nsx-t-deterministic-traffic-on-vlan-backed-segments.html.  Essentially you can see the Edge node depicted has two uplinks, one to each ToR.

Shashank Mohan

VCIX-NV 2022 | VCP-DCV2019 | CCNP Specialist

https://lab2prod.com.au
LinkedIn https://www.linkedin.com/in/shankmohan/
Twitter @ShankMohan
Author of NSX-T Logical Routing: https://link.springer.com/book/10.1007/978-1-4842-7458-3
AndrewCirel
Enthusiast
Enthusiast

Hi Shashank,

Thanks for the quick reply.

You can also multipath over a single public VLAN when you have multiple BGP peers setup which works natively in NSX-T, so it is a shame VCF enforces it.

Thanks, Andrew.

 

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shank89
Expert
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Whilst that approach may work, it is not the general recommended approach.

Shashank Mohan

VCIX-NV 2022 | VCP-DCV2019 | CCNP Specialist

https://lab2prod.com.au
LinkedIn https://www.linkedin.com/in/shankmohan/
Twitter @ShankMohan
Author of NSX-T Logical Routing: https://link.springer.com/book/10.1007/978-1-4842-7458-3