point to powershell docs

Author: Tanu Balla

articles/expressroute/expressroute-howto-add-ipv6-portal.md

@@ -71,7 +71,7 @@ Follow the steps below if you plan to connect to a new set of Azure resources us
 
 1. [Create the dual-stack gateway subnet](expressroute-howto-add-gateway-portal-resource-manager.md#create-the-gateway-subnet).
 
-1. [Create the virtual network gateway](expressroute-howto-add-gateway-portal-resource-manager.md#create-the-virtual-network-gateway) using any SKU and a Standard, Static public IP address. If you plan to use FastPath, use UltraPerformance or ErGw3AZ (note that this option is only available for circuits using ExpressRoute Direct).
+1. [Create the virtual network gateway](https://docs.microsoft.com/azure/expressroute/expressroute-howto-add-gateway-resource-manager) using any SKU and a Standard, Static public IP address. If you plan to use FastPath, use UltraPerformance or ErGw3AZ (note that this option is only available for circuits using ExpressRoute Direct). **NOTE:** Please use the PowerShell instructions for this step as the Azure portal experience is still under development.
 
 1. [Link your virtual network to your ExpressRoute circuit](expressroute-howto-linkvnet-portal-resource-manager.md).