Connect an ENS VPC to central cloud VPC through ENA - Edge Network Acceleration

Use Edge Network Acceleration (ENA) to establish private connectivity between an Edge Node Service (ENS) VPC and a central cloud VPC.

Example scenario

A company has a VPC with the CIDR block 192.168.200.0/24 in the Alibaba Cloud ENS Macao (China)-1 node and a VPC with the CIDR block 172.16.100.0/24 in the China (Hong Kong) node. The company uses ENA to enable private communication between the central cloud VPC and the ENS VPC over Border Gateway Protocol (BGP). BGP allows the Alibaba Cloud Express Connect Virtual Border Router (VBR) to exchange routing information with the Edge Virtual Border Router (EVBR). The required bandwidth is 100 Mbps.

The following table lists the CIDR blocks used in this example. Plan your own CIDR blocks as needed, but make sure they do not overlap.

Organization	CIDR block	Server or client address
ENS VPC	`192.168.200.0/24`	ENS instance address: `192.168.200.1`
Central cloud VPC	`172.16.100.0/24`	ECS instance address: `172.16.100.1`
EVBR	VLAN: 100 EVBR-side IPv4 address: `10.0.0.2/30` Client-side IPv4 address: `10.0.0.1/30`	Not applicable
Central cloud VBR	VLAN: 100 VBR-side IPv4 address: 10.0.0.1/30 Client-side IPv4 address: 10.0.0.2/30	Not applicable

Prerequisites

Your Alibaba Cloud account has passed verification. Complete the verification in the Account Center.
You have created a VPC and a vSwitch in the ENS Macao-1 (China) node and deployed services in the VPC such as ENS instances.
You have created an edge port and line and connected them to your on-premises data center.
You have reviewed the billing rules for ENA. In this topic, you must purchase a shared edge port instance for cloud connection and an EPN instance. For more information, see
- Edge shared port pricing
- Edge Multi-point Network pricing
For more information about the billing rules of Express Connect and Cloud Enterprise Network (CEN), see the following topics:
- Billing overview of Express Connect
- Billing of CEN

Procedure

Step 1: Create an EPN instance

Create and activate an EPN instance.

Log on to the Edge Network Acceleration (ENA) console and choose Business Instances > Create EPN Instance.

On the EPN Instances page, click Create EPN Instance and configure the parameters.

Item	Description
Name	The instance name.
Region	Select Global (Outside Chinese Mainland).
Description	The instance description.

After you configure the parameters, click OK.
After the instance is created, click OK in the dialog, then click Buy Now on the payment page.

Note
EPN is pay-as-you-go. No payment is required at this time. For billing details, see Edge Private Network pricing.
On the order confirmation page, click Activate Now.

Step 2: Create an EVBR on an edge port and configure routing

On the EPN Instances page, find the EPN instance that you created and click Details.

On the details page of the EPN instance, click Add EVBR and configure the following parameters.

Note

The parameter values in this topic are for reference only. Specify the values as needed. For more information about the parameters, see Create an access point.

Item	Description	Example value
Edge Access Port	The edge port on which to create the EVBR.	The edge port on which to create the EVBR. Note If no edge port instance is available, see Edge network resources to create one.
VLAN ID	The VLAN ID of the EVBR.	100
Bandwidth	The bandwidth of the EVBR, in Mbps.	100
Route Method	The routing method. Select BGP or static routing.	BGP
Edge Cloud Peer IP Address	The IPv4 address on the EVBR side.	`10.0.0.2/30`
Client Peer IP Address	The IPv4 address on the peer side of the EVBR.	`10.0.0.1/30`

Configure VBR routing.
- Configure this in the Alibaba Cloud Express Connect console. For more information, see Configure and manage BGP.
- When configuring VBR routing, enter 45103 as the peer AS number. This is the unified AS number for the ENA EVBR.

Step 3: Create an ENSGW and associate a vSwitch

On the EPN Instances page, find the EPN instance that you created and click Details.

On the details page of the EPN instance, click Add ENSGW and configure the following parameters.

Configuration	Description	Example value
Node	The ENS node where the ENSGW is created.	`mo-taipa-1`
Rate Limit (Mbit/s)	The rate limit for the ENSGW.	100

On the details page, verify that the ENSGW status is Running.

Click Associate vSwitch to the right of the ENSGW and configure the following parameter.

Note

After creating the ENSGW, you must associate it with an ENS vSwitch to add the corresponding VPC to the network.

Configuration	Description
vSwitch	The ENS vSwitch to add to the Edge Multipoint Connection Instance. Note You can view ENS vSwitches in the ENS console.

After confirming the information, select the I Have Confirmed the vSwitch Information check box and click OK.

Step 4: Test the connection

Test the network connection between the central cloud VPC and the ENS VPC.

On the host 172.16.100.1 in the central cloud VPC, open the command-line window.
Ping the IP address 192.168.200.1 of the ENS instance. A reply message indicates that the central cloud VPC can communicate with the ENS VPC 192.168.200.0/24 .