title: 'Azure ExpressRoute: Configure peering: classic' description: This article walks you through the steps for creating and provisioning the private, public and Microsoft peering of an ExpressRoute circuit. This article also shows you how to check the status, update, or delete peerings for your circuit. services: expressroute author: duongau
ms.service: expressroute ms.topic: how-to ms.date: 12/06/2019 ms.author: duau
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This article walks you through the steps to create and manage peering/routing configuration for an ExpressRoute circuit using PowerShell and the classic deployment model. The steps below will also show you how to check the status, update, or delete and deprovision peerings for an ExpressRoute circuit. You can configure one, two, or all three peerings (Azure private, Azure public, and Microsoft) for an ExpressRoute circuit. You can configure peerings in any order you choose. However, you must make sure that you complete the configuration of each peering one at a time.
These instructions only apply to circuits created with service providers that offer Layer 2 connectivity services. If you are using a service provider that offers managed Layer 3 services (typically an IPVPN, like MPLS), your connectivity provider will configure and manage routing for you.
[!INCLUDE expressroute-classic-end-include]
About Azure deployment models
[!INCLUDE vpn-gateway-classic-rm]
- Make sure that you have reviewed the prerequisites page, the routing requirements page, and the workflows page before you begin configuration.
- You must have an active ExpressRoute circuit. Follow the instructions to create an ExpressRoute circuit and have the circuit enabled by your connectivity provider before you proceed. The ExpressRoute circuit must be in a provisioned and enabled state for you to be able to run the cmdlets described below.
[!INCLUDE classic powershell install instructions]
This section provides instructions on how to create, get, update, and delete the Azure private peering configuration for an ExpressRoute circuit.
-
Create an ExpressRoute circuit.
Follow the instructions to create an ExpressRoute circuit and have it provisioned by the connectivity provider. If your connectivity provider offers managed Layer 3 services, you can request your connectivity provider to enable Azure private peering for you. In that case, you won't need to follow instructions listed in the next sections. However, if your connectivity provider does not manage routing for you, after creating your circuit, follow the instructions below.
-
Check the ExpressRoute circuit to make sure it is provisioned.
Check to see if the ExpressRoute circuit is Provisioned and also Enabled.
Get-AzureDedicatedCircuit -ServiceKey "*********************************"
Return:
Bandwidth : 200 CircuitName : MyTestCircuit Location : Silicon Valley ServiceKey : ********************************* ServiceProviderName : equinix ServiceProviderProvisioningState : Provisioned Sku : Standard Status : Enabled
Make sure that the circuit shows as Provisioned and Enabled. If it isn't, work with your connectivity provider to get your circuit to the required state and status.
ServiceProviderProvisioningState : Provisioned Status : Enabled
-
Configure Azure private peering for the circuit.
Make sure that you have the following items before you proceed with the next steps:
- A /30 subnet for the primary link. This must not be part of any address space reserved for virtual networks.
- A /30 subnet for the secondary link. This must not be part of any address space reserved for virtual networks.
- A valid VLAN ID to establish this peering on. Verify that no other peering in the circuit uses the same VLAN ID.
- AS number for peering. You can use both 2-byte and 4-byte AS numbers. You can use a private AS number for this peering. Verify that you are not using 65515.
- An MD5 hash if you choose to use one. Optional.
You can use the following example to configure Azure private peering for your circuit:
New-AzureBGPPeering -AccessType Private -ServiceKey "*********************************" -PrimaryPeerSubnet "10.0.0.0/30" -SecondaryPeerSubnet "10.0.0.4/30" -PeerAsn 1234 -VlanId 100
If you want to use an MD5 hash, use the following example to configure private peering for your circuit:
New-AzureBGPPeering -AccessType Private -ServiceKey "*********************************" -PrimaryPeerSubnet "10.0.0.0/30" -SecondaryPeerSubnet "10.0.0.4/30" -PeerAsn 1234 -VlanId 100 -SharedKey "A1B2C3D4"
[!IMPORTANT] Verify that you specify your AS number as peering ASN, not customer ASN.
You can view configuration details using the following cmdlet:
Get-AzureBGPPeering -AccessType Private -ServiceKey "*********************************"Return:
AdvertisedPublicPrefixes :
AdvertisedPublicPrefixesState : Configured
AzureAsn : 12076
CustomerAutonomousSystemNumber :
PeerAsn : 1234
PrimaryAzurePort :
PrimaryPeerSubnet : 10.0.0.0/30
RoutingRegistryName :
SecondaryAzurePort :
SecondaryPeerSubnet : 10.0.0.4/30
State : Enabled
VlanId : 100
You can update any part of the configuration using the following cmdlet. In the following example, the VLAN ID of the circuit is being updated from 100 to 500.
Set-AzureBGPPeering -AccessType Private -ServiceKey "*********************************" -PrimaryPeerSubnet "10.0.0.0/30" -SecondaryPeerSubnet "10.0.0.4/30" -PeerAsn 1234 -VlanId 500 -SharedKey "A1B2C3D4"You can remove your peering configuration by running the following cmdlet. You must make sure that all virtual networks are unlinked from the ExpressRoute circuit before running this cmdlet.
Remove-AzureBGPPeering -AccessType Private -ServiceKey "*********************************"This section provides instructions on how to create, get, update, and delete the Azure public peering configuration for an ExpressRoute circuit.
Note
Azure public peering is deprecated for new circuits.
-
Create an ExpressRoute circuit
Follow the instructions to create an ExpressRoute circuit and have it provisioned by the connectivity provider. If your connectivity provider offers managed Layer 3 services, you can request your connectivity provider to enable Azure public peering for you. In that case, you won't need to follow instructions listed in the next sections. However, if your connectivity provider does not manage routing for you, after creating your circuit, follow the instructions below.
-
Check ExpressRoute circuit to verify that it is provisioned
You must first check to see if the ExpressRoute circuit is Provisioned and also Enabled.
Get-AzureDedicatedCircuit -ServiceKey "*********************************"
Return:
Bandwidth : 200 CircuitName : MyTestCircuit Location : Silicon Valley ServiceKey : ********************************* ServiceProviderName : equinix ServiceProviderProvisioningState : Provisioned Sku : Standard Status : Enabled
Verify that the circuit shows as Provisioned and Enabled. If it isn't, work with your connectivity provider to get your circuit to the required state and status.
ServiceProviderProvisioningState : Provisioned Status : Enabled
-
Configure Azure public peering for the circuit
Make sure that you have the following information before you proceed:
- A /30 subnet for the primary link. This must be a valid public IPv4 prefix.
- A /30 subnet for the secondary link. This must be a valid public IPv4 prefix.
- A valid VLAN ID to establish this peering on. Verify that no other peering in the circuit uses the same VLAN ID.
- AS number for peering. You can use both 2-byte and 4-byte AS numbers.
- An MD5 hash if you choose to use one. Optional.
[!IMPORTANT] Make sure that you specify your AS number as peering ASN and not customer ASN.
You can use the following example to configure Azure public peering for your circuit:
New-AzureBGPPeering -AccessType Public -ServiceKey "*********************************" -PrimaryPeerSubnet "131.107.0.0/30" -SecondaryPeerSubnet "131.107.0.4/30" -PeerAsn 1234 -VlanId 200
If you want to use an MD5 hash, use the following example to configure your circuit:
New-AzureBGPPeering -AccessType Public -ServiceKey "*********************************" -PrimaryPeerSubnet "131.107.0.0/30" -SecondaryPeerSubnet "131.107.0.4/30" -PeerAsn 1234 -VlanId 200 -SharedKey "A1B2C3D4"
To view configuration details, use the following cmdlet:
Get-AzureBGPPeering -AccessType Public -ServiceKey "*********************************"Return:
AdvertisedPublicPrefixes :
AdvertisedPublicPrefixesState : Configured
AzureAsn : 12076
CustomerAutonomousSystemNumber :
PeerAsn : 1234
PrimaryAzurePort :
PrimaryPeerSubnet : 131.107.0.0/30
RoutingRegistryName :
SecondaryAzurePort :
SecondaryPeerSubnet : 131.107.0.4/30
State : Enabled
VlanId : 200You can update any part of the configuration using the following cmdlet. In this example, the VLAN ID of the circuit is being updated from 200 to 600.
Set-AzureBGPPeering -AccessType Public -ServiceKey "*********************************" -PrimaryPeerSubnet "131.107.0.0/30" -SecondaryPeerSubnet "131.107.0.4/30" -PeerAsn 1234 -VlanId 600 -SharedKey "A1B2C3D4"Verify that the circuit shows as Provisioned and Enabled.
You can remove your peering configuration by running the following cmdlet:
Remove-AzureBGPPeering -AccessType Public -ServiceKey "*********************************"This section provides instructions on how to create, get, update, and delete the Microsoft peering configuration for an ExpressRoute circuit.
-
Create an ExpressRoute circuit
Follow the instructions to create an ExpressRoute circuit and have it provisioned by the connectivity provider. If your connectivity provider offers managed Layer 3 services, you can request your connectivity provider to enable Azure private peering for you. In that case, you won't need to follow instructions listed in the next sections. However, if your connectivity provider does not manage routing for you, after creating your circuit, follow the instructions below.
-
Check ExpressRoute circuit to verify that it is provisioned
Verify that the circuit shows as Provisioned and Enabled.
Get-AzureDedicatedCircuit -ServiceKey "*********************************"
Return:
Bandwidth : 200 CircuitName : MyTestCircuit Location : Silicon Valley ServiceKey : ********************************* ServiceProviderName : equinix ServiceProviderProvisioningState : Provisioned Sku : Standard Status : Enabled
Verify that the circuit shows as Provisioned and Enabled. If it isn't, work with your connectivity provider to get your circuit to the required state and status.
ServiceProviderProvisioningState : Provisioned Status : Enabled
-
Configure Microsoft peering for the circuit
Make sure that you have the following information before you proceed.
- A /30 subnet for the primary link. This must be a valid public IPv4 prefix owned by you and registered in an RIR / IRR.
- A /30 subnet for the secondary link. This must be a valid public IPv4 prefix owned by you and registered in an RIR / IRR.
- A valid VLAN ID to establish this peering on. Verify that no other peering in the circuit uses the same VLAN ID.
- AS number for peering. You can use both 2-byte and 4-byte AS numbers.
- Advertised prefixes: You must provide a list of all prefixes you plan to advertise over the BGP session. Only public IP address prefixes are accepted. You can send a comma-separated list if you plan to send a set of prefixes. These prefixes must be registered to you in an RIR / IRR.
- Customer ASN: If you are advertising prefixes that are not registered to the peering AS number, you can specify the AS number to which they are registered. Optional.
- Routing Registry Name: You can specify the RIR / IRR against which the AS number and prefixes are registered.
- An MD5 hash, if you choose to use one. Optional.
Run the following cmdlet to configure Microsoft peering for your circuit:
New-AzureBGPPeering -AccessType Microsoft -ServiceKey "*********************************" -PrimaryPeerSubnet "131.107.0.0/30" -SecondaryPeerSubnet "131.107.0.4/30" -VlanId 300 -PeerAsn 1234 -CustomerAsn 2245 -AdvertisedPublicPrefixes "123.0.0.0/30" -RoutingRegistryName "ARIN" -SharedKey "A1B2C3D4"
You can view configuration details using the following cmdlet:
Get-AzureBGPPeering -AccessType Microsoft -ServiceKey "*********************************"Return:
AdvertisedPublicPrefixes : 123.0.0.0/30
AdvertisedPublicPrefixesState : Configured
AzureAsn : 12076
CustomerAutonomousSystemNumber : 2245
PeerAsn : 1234
PrimaryAzurePort :
PrimaryPeerSubnet : 10.0.0.0/30
RoutingRegistryName : ARIN
SecondaryAzurePort :
SecondaryPeerSubnet : 10.0.0.4/30
State : Enabled
VlanId : 300You can update any part of the configuration using the following cmdlet:
Set-AzureBGPPeering -AccessType Microsoft -ServiceKey "*********************************" -PrimaryPeerSubnet "131.107.0.0/30" -SecondaryPeerSubnet "131.107.0.4/30" -VlanId 300 -PeerAsn 1234 -CustomerAsn 2245 -AdvertisedPublicPrefixes "123.0.0.0/30" -RoutingRegistryName "ARIN" -SharedKey "A1B2C3D4"You can remove your peering configuration by running the following cmdlet:
Remove-AzureBGPPeering -AccessType Microsoft -ServiceKey "*********************************"Next, Link a VNet to an ExpressRoute circuit.
- For more information about workflows, see ExpressRoute workflows.
- For more information about circuit peering, see ExpressRoute circuits and routing domains.