I would like to ask How to implement Microsoft Azure Express route active / active or active / standby with 2 provider, 2 Circuit ID

@zay yar

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 create a dual Azure Express route Circuits with different service providers.

• Generally, Azure ExpressRoute Gateways are deployed in the Hub VNET
• And other VNETs in Azure (called Spoke VNETs) are peered to this HubVNET
• You can link this Hub VNET to both of the ExpressRoute Circuits.

See : Link a virtual network to an ExpressRoute

Depending on the Gateway SKU of your VNET, please note that you can only link it to a certain number of circuits.

• See : Feature support by gateway SKU
• 

Using Active-Active Set up is not recommended

• As this would lead to traffic originating from One Circuit and leaving via another circuit leading to asymmetric routing.
• So, instead use Active-Passive set up.
• To prefer one circuit over other, you can either use connection weight
  • See : Modify a virtual network connection
    
• or You can achieve this using AS PATH prepending
  • See : https://video2.skills-academy.com/en-us/azure/expressroute/expressroute-optimize-routing#suboptimal-routing-from-microsoft-to-customer

Thanks,

Kapil

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