Updated on 2024-01-16 GMT+08:00

Propagation Overview

You can create a propagation for each attachment to propagate routes to one or more route tables on an enterprise router.

If you do not want to create a propagation, you can manually add static routes for attachments to the route tables.

Figure 1 Propagated routes and static routes
Table 1 Propagation description

Attachment Type

Propagated Info

Way to Create Propagation

Description

VPC

VPC CIDR blocks

  • Auto creation: If Default Route Table Propagation is enabled and the default propagation route table is specified, attachments automatically propagate routes to the default propagation route table.
  • Manual creation: You can select a route table and create a propagation for an attachment in the route table. For details, see Creating a Propagation for an Attachment in the Route Table.

An attachment can be propagated to different route tables. You can create propagations for attachments in Figure 1 as follows:

  • Auto creation: Propagations are automatically created for the attachments, such as virtual gateway 1, VPN gateway 1, and VPC 1 attachments, in the default propagation route table of the enterprise router.
  • Manual creation: You need to manually create propagations in the custom route table of the enterprise router for attachments, such as virtual gateway 1, VPC 1, VPN gateway 2, and virtual gateway 2 attachments.
  • No propagation: If you do not want to use propagated routes, you need to manually add static routes to the custom route table of the enterprise router for attachments, such as VPC 2 attachment.

Virtual gateway

All routes

VPN gateway

All routes