Procedure for Using Enterprise Router to Migrate the Network Set Up Through Direct Connect

When creating the enterprise router, enable Default Route Table Association and Default Route Table Propagation. For details, see Table 4.

For details, see Creating an Enterprise Router.

Do not enable Auto Add Routes and manually add routes with destinations set to the large CIDR block in the VPC route table.

For details, see Creating VPC Attachments for the Enterprise Router.

In this example, Default Route Table Association and Default Route Table Propagation are enabled for the enterprise router, and routes with destinations set to VPC CIDR blocks are automatically added when you attach the VPCs to the enterprise router.

If Default Route Table Propagation is not enabled when creating the enterprise router, you need to manually add routes with destinations set to the VPC CIDR blocks to the enterprise router route table. For details, see Creating a Static Route.

For enterprise router route details, see Table 1 and Table 3.

To view enterprise routes, see Viewing Routes.

For VPC route details, see Table 1 and Table 2.

In this example, the large CIDR block is 172.16.0.0/15, and the next hop is the enterprise router.

For details, see Adding Routes to VPC Route Tables.

For details, see Creating a Global DC Gateway.

1. Log in to the on-premises network device and delete the configuration of VIF-A01.

   Before deleting VIF-A01 on the Direct Connect console, delete the configuration of VIF-A01 on the on-premises network device to ensure that traffic does not pass through this virtual interface.

2. Delete virtual interface VIF-A01 on the Direct Connect console.

   For details, see Deleting a Virtual Interface.

   After the virtual interface is deleted, the system route pointing to VGW-A and destined for the local and remote gateways of VIF-A01 will be deleted from the VPC route table. For VPC route details, see Table 2.

   In this example, the route whose destination is 10.0.0.0/30 and next hop is the virtual gateway will be automatically deleted.

1. On the Direct Connect console, perform the following operations:
   1. Create virtual interface VIF-B01.
   2. Attach the global DC gateway to the enterprise router.

   For details, see Creating a Global DC Gateway.

2. On the Enterprise Router console, view the global DC gateway attachment created for the enterprise router.

   If the status of the global DC gateway attachment is Normal, the attachment has been created.

   Default Route Table Association and Default Route Table Propagation are enabled when you create the enterprise router. After the global DC gateway is attached to the enterprise router, Enterprise Router will automatically:

   • Associate the global DC gateway attachment with the default route table of the enterprise router.
   • Propagate the global DC gateway attachment to the default route table of the enterprise router. The routes to the on-premises data center are propagated to the route table.

     You can view routes to the on-premises data center in the route table of the enterprise router only after taking the following steps.

• If virtual interface VIF-B01 uses BGP routing, the on-premises data center can access cloud resources through VIF-B01 after 3 is complete. In this case, skip this step.
• If virtual interface VIF-B01 uses static routing, the on-premises data center can access cloud resources through VIF-B01 only after the current step is complete.
• If you do not want the traffic from the on-premises data center to pass through virtual interface VIF-B01, take this step to configure a specified virtual interface.

For VPC route details, see Table 2.

In this example, the route destination is 172.16.0.12/32 and next hop is the enterprise router.

For details, see Adding Routes to VPC Route Tables.

For more resource details, see Table 4.

For details, see Methods of Purchasing ECSs.

Multiple methods are available for logging in to an ECS. For details, see Logging In to an ECS.

ping <IP-address-of-an-on-premises-server>

Add the IP address of an on-premises server to the VPC route table and run the following command:

ping 172.16.0.12

[root@ecs-X ~]# ping 172.16.0.12
PING 172.16.0.12 (172.16.0.12) 56(84) bytes of data.
64 bytes from 172.16.0.12: icmp_seq=1 ttl=64 time=0.849 ms
64 bytes from 172.16.0.12: icmp_seq=2 ttl=64 time=0.455 ms
64 bytes from 172.16.0.12: icmp_seq=3 ttl=64 time=0.385 ms
64 bytes from 172.16.0.12: icmp_seq=4 ttl=64 time=0.372 ms
...
--- 172.16.0.12 ping statistics ---

1. Delete the route from the VPC route table.

   To delete a route, refer to Deleting a Route.

2. Delete the ECS.

   To delete an ECS, refer to How Can I Delete or Restart an ECS?

For details, see Creating a Global DC Gateway.

1. Log in to the on-premises network device and delete the configuration of VIF-A02.

   Before deleting VIF-A02 on the Direct Connect console, delete the configuration of VIF-A02 on the on-premises network device to ensure that traffic does not pass through this virtual interface.

2. Delete virtual interface VIF-A02 on the Direct Connect console.

   For details, see Deleting a Virtual Interface.

   After the virtual interface is deleted, the two routes pointing to virtual gateway VGW-A are deleted from the VPC route table. For VPC route details, see Table 2.

   • The system route whose destination is the local and remote gateways of virtual interface VIF-A02.

     In this example, the route whose destination is 10.1.0.0/30 and next hop is the virtual gateway will be automatically deleted.

   • The system route destined for the on-premises data center.

     In this example, the route whose destination is 172.16.0.0/16 and next hop is the virtual gateway will be automatically deleted.

1. On the Direct Connect console, perform the following operations:
   1. Create virtual interface VIF-B02.
   2. Attach the global DC gateway to the enterprise router.

   For details, see Creating a Global DC Gateway.

2. On the Enterprise Router console, view the global DC gateway attachment created for the enterprise router.

   If the status of the global DC gateway attachment is Normal, the attachment has been created.

   Default Route Table Association and Default Route Table Propagation are enabled when you create the enterprise router. After the global DC gateway is attached to the enterprise router, Enterprise Router will automatically:

   • Associate the global DC gateway attachment with the default route table of the enterprise router.
   • Propagate the global DC gateway attachment to the default route table of the enterprise router. The routes to the on-premises data center are propagated to the route table.

     You can view routes to the on-premises data center in the route table of the enterprise router only after taking the following steps.

• If virtual interface VIF-B02 uses BGP routing, the on-premises data center can access cloud resources through VIF-B02 after 3 is complete. In this case, skip this step.
• If virtual interface VIF-B02 uses static routing, the on-premises data center can access cloud resources through VIF-B02 only after the current step is complete.
• If you do not want the traffic from the on-premises data center to pass through virtual interface VIF-B02, take this step to configure a specified virtual interface.

• Load balancing mode: For details, see Setting Up a Hybrid Cloud Network Using Enterprise Router and a Pair of Direct Connect Connections (Global DC Gateway).
• Active/Standby mode: For details, see Setting Up a Hybrid Cloud Network Using Enterprise Router and a Pair of Active/Standby Direct Connect Connections (Global DC Gateway).

For details, see Deleting a Virtual Gateway.