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33 lines
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:original_name: er_01_0035.html
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.. _er_01_0035:
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Propagation Overview
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====================
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You can create a propagation for each attachment to propagate routes to one or more route tables on an enterprise router.
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If you do not want to create a propagation, you can manually add static routes for attachments to the route tables.
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.. _er_01_0035__fig16423163124017:
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.. figure:: /_static/images/en-us_image_0000001347809009.png
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:alt: **Figure 1** Propagated routes and static routes
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**Figure 1** Propagated routes and static routes
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.. table:: **Table 1** Propagation description
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+-----------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Attachment Type | Propagated Info | Way to Create Propagation | Description |
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+=================+=================+===================================================================================================================================================================================================================+=================================================================================================================================================================================================================+
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| 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. | An attachment can be propagated to different route tables. You can create propagations for attachments in :ref:`Figure 1 <er_01_0035__fig16423163124017>` as follows: |
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| | | - If you want to enable this function when you create an enterprise router, refer to :ref:`Creating an Enterprise Router <er_01_0069>`. | - Auto creation: Propagations are automatically created for the attachments, such as VPC 1, VPC 2, and virtual gateway 1 attachments, in the default propagation route table of the enterprise router. |
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| | | - If you want to enable this function after an enterprise router is created, refer to :ref:`Modifying an Enterprise Router <er_01_0013>`. | - Manual creation: You need to manually create propagations in the custom route table of the enterprise router for attachments, such as VPC 1, virtual gateway 1, and virtual gateway 2 attachments. |
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| | | | - 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 3 and VPC 4 attachments. |
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| | | - Manual creation: You can select a route table and create a propagation for an attachment in the route table. For details, see :ref:`Creating a Propagation for an Attachment in the Route Table <er_01_0036>`. | |
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+-----------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Virtual gateway | All routes | | |
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+-----------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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