Merge pull request #288355 from duongau/patch-7

ExpressRoute - Configure route filter with PowerShell (fix command to use index)

Author: prmerger-automator[bot]

articles/expressroute/how-to-routefilter-powershell.md

@@ -96,7 +96,8 @@ Run the following command to attach the route filter to the ExpressRoute circuit
 
 ```azurepowershell-interactive
 $ckt = Get-AzExpressRouteCircuit -Name "ExpressRouteARMCircuit" -ResourceGroupName "MyResourceGroup"
-$ckt.Peerings[0].RouteFilter = $routefilter 
+$index = [array]::IndexOf(@($ckt.Peerings.PeeringType), "MicrosoftPeering")
+$ckt.Peerings[$index].RouteFilter = $routefilter
 Set-AzExpressRouteCircuit -ExpressRouteCircuit $ckt
 ```