Procedure for Migrating a Network from Direct Connect to Enterprise Router

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.

Figure 1 Enterprise router details

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

For details, see Creating VPC Attachments to 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 larger 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.

VGW-B is used to replace VGW-A after the migration.

1. On the Direct Connect console, create a virtual gateway.

   For details, see Step 2: Create a Virtual Gateway.

2. On the Enterprise Router console, check whether the virtual gateway attachment has been added to the enterprise router.

   If the status of the virtual gateway attachment is Normal, the attachment has been added.

   Default Route Table Association and Default Route Table Propagation are enabled when you create the enterprise router. After you attach the virtual gateway to the enterprise router, the system will automatically:

   • Associate the virtual gateway attachment with the default route table of the enterprise router.
   • Propagate the virtual gateway attachment to the default route table of the enterprise router. The routes destined for the on-premises CIDR block are propagated to the route table.

     You can view routes destined for the on-premises CIDR block in the route table of the enterprise router only after creating a virtual interface by performing 3.

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

   Before deleting virtual interface VIF-A02 on the Direct Connect console, complete configuration 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 system route pointing to VGW-A and destined for the local and remote gateways of VIF-A02 will be deleted from the VPC route table. For VPC route details, see Table 2.

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

VIF-B02 is used to replace VIF-A02 after the migration.

Create a virtual interface to connect the virtual gateway with the on-premises data center. For details, see Step 3: Create a Virtual Interface.

In the enterprise router route table, two routes pointing to VGW-B are automatically added. One route is destined for the on-premises CIDR block, and the other route for the local and remote gateways of VIF-B02. For enterprise router route details, see Table 3.

In this example, the route destinations are 172.16.0.0/16 and 10.1.0.0/30 and next hops are the virtual gateway.

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?

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, complete configuration 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 two routes pointing to virtual gateway VGW-A are deleted from the VPC route table. For VPC route details, Table 2.

   • The system route whose destination is the local and remote gateways of virtual interface VIF-A01.

     In this example, the route whose destination is 10.0.0.0/30 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.

VIF-B01 is used to replace VIF-A01 after the migration.

Create a virtual interface to connect the virtual gateway with the on-premises data center. For details, see Step 3: Create a Virtual Interface.

In the enterprise router route table, a route pointing to VGW-B is automatically added. The route destination is the local and remote gateways of virtual interface VIF-B02. For enterprise router route details, see Table 3.

In this example, the route destination is 10.0.0.0/30 and next hop is the virtual gateway attachment.

For details, see Deleting a Virtual Gateway.