Physical Express Route Link Migration

Question

Trying to migrate the Express route circuit from an 1G physical circuit to 10G physical circuit.

For migration, I'm trying to create a new circuit over the 10G link and create a new express route virtual network gateway.

However, I'm getting the error which states as below.

"The Virtual Network already has a gateway of this type or the existing gateway in the virtual network does not support coexistence"

Answer 1

Hello Bharaniraj Iyyamperumal,

Thanks for your question.

The error means that a VPN gateway might be in existence already which doesn’t support co-existence with the one that you are trying to configure. In an Azure Virtual Network, you can deploy only one VPN gateway, this is documented here.

Also please take a look at this doc "Configure ExpressRoute and site-to-site coexisting connections using PowerShell" https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-coexist-resource-manager?tabs=new-virtual-network#add

Please let me know if you have further questions

You can mark it 'Accept Answer' if this helped.

Answer 2

@Bharaniraj Iyyamperumal ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

I understand that you would like to deploy a new ExpressRoute Gateway in the GatewaySubnet already comprising of an ExpressRoute Gateway.

This is not supported, you cannot deploy a 2nd ExpressRoute Gateway in GatewaySubnet.

• Is there a specific reason why you are trying to do this?
• Is it because you would like to upgrade the SKU?
  • In that case, consider "Resize-AzVirtualNetworkGateway" to upgrade the SKU
  • See : Gateway SKUs

Also, note that you can connect a single ExpressRoute Gateway up to 4 ExpressRoute Connections.

• So you can link the existing Gateway to the new Circuit
• Migrate all the existing traffic to the new Circuit
• And delete the old Circuit without having to deploy a new Gateway in the first place

Cheers,

Kapil