This topic describes how to create a custom route table. A route table consists of one or more route entries. Each route entry specifies the destination network to which traffic is routed. You can create a custom route table to manage the inbound and outbound network traffic of subnets in the VPC network.

Procedure

  1. Log on to the VPC console.
  2. In the left-side navigation pane, click Route Tables.
  3. Select the region where you want to create the route table.
    Note Custom route tables are applicable in all regions except China (Beijing), China (Shenzhen), and China (Hangzhou).
  4. On the Route Tables page, click Create Route Table.
  5. In the Create Route Table dialog box that appears, set the following parameters and click OK.
    Parameter Description
    Resource Group Select the resource group to which the route table belongs.
    VPC Select the VPC network to which the route table belongs.

    If a VPC network contains an ECS instance that belongs to one of the following instance families, you cannot create a custom route table for the VPC network.

    ecs.c1, ecs.c2, ecs.c4, ecs.c5, ecs.ce4, ecs.cm4, ecs.d1, ecs.e3, ecs.e4, ecs.ga1, ecs.gn4, ecs.gn5, ecs.i1, ecs.m1, ecs.m2, ecs.mn4, ecs.n1, ecs.n2, ecs.n4, ecs.s1, ecs.s2, ecs.s3, ecs.se1, ecs.sn1, ecs.sn2, ecs.t1, and ecs.xn4.

    To create a custom route table, you must upgrade or release ECS instances that do not support VPC advanced features.
    Note If your VPC network contains ECS instances of the preceding instance families and uses a custom route table, you must upgrade or release the instance. Otherwise, the custom route table cannot work as expected. For more information, see VPC advanced features.
    Name Enter a name for the route table.

    The name must be 2 to 128 characters in length and can contain letters, digits, underscores (_), and hyphens (-). It must start with a letter or a Chinese character.

    Description Enter a description for the route table.

    The description must be 2 to 256 characters in length and cannot start with http:// or https://.

    After you create a custom route table, you can go to the Route Tables page to see the custom route table. The type of the route table is displayed as Custom in the Route Table Type column.Custom route tableThe following system route entries are automatically added to the custom route table:
    • A route entry destined for the CIDR block 100.64.0.0/10. This route entry is used for communication among cloud resources over the VPC network.
    • A route entry destined for the CIDR block of a VSwitch in the VPC network to which the route table belongs. This route entry is used for communications among resources in the VSwitch.
    For example, you have created two VSwitches whose CIDR blocks are 192.168.1.0/24 and 192.168.0.0/24. These VSwitches are deployed in the VPC network whose CIDR block is 192.168.0.0/16. The custom route table that you have created for your VPC network includes the following route entries:
    Destination CIDR block Next hop Type
    100.64.0.0/10 - System route
    192.168.1.0/24 - System route
    192.168.0.0/24 - System route