Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I am not sure what is expected from your OnPrem Router/Device,
But from Azure end you can use
For Circuit :
- Use Get-AzExpressRouteCircuitRouteTable command
- More details can be found in : Validate BGP and routes on the MSEE
For Gateway :
- Use Get-AzVirtualNetworkGatewayLearnedRoute to list the routes learned by ExpressRoute Gateway
- And use Get-AzVirtualNetworkGatewayAdvertisedRoute to list the routes advertised by ExpressRoute Gateway
Please let us know if we can be of any further assistance here.
Thanks,
Kapil
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