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Transit Router

Route tables

Enabling or disabling auto publishing

Scenarios

The auto publishing feature automatically publishes routes in the Transit Router (TR) route table to the route table of the network instance. The default status of the auto publishing feature depends on the TR attachment type, as shown in the table below.

Attachment type	Routing propagation mode	Auto publishing status
VPC attachment	--	This feature is related to the settings during creation and can be enabled/disabled as needed.
VPN attachment	Static routes	This feature is disabled by default and cannot be enabled.
VPN attachment		Dynamic	This feature is enabled by default and cannot be disabled.
DC Gateway attachment	--	This feature is enabled by default and cannot be disabled.
Inter-region attachment	--	This feature is enabled by default and cannot be disabled.

Enable auto publishing

Limits

When a single Virtual Private Cloud (VPC) is attached to multiple TR instances, each TR can have auto publishing enabled for up to 5 VPC attachments.

Auto publishing for a cross-account VPC attachment can only be enabled by the VPC owner. The TR owner cannot perform this action.

Instructions

When you enable auto publishing, the system automatically retrieves routes from the TR associated forwarding route table for the target attachment. It then publishes these routes into the route table of that network instance. For details, see Route synchronization.

If you have manually configured a route pointing to the TR on the VPC side and want to use the auto publishing feature, first enable auto publishing, then delete the manually configured route on the VPC side.

warning

This action may cause about 1 second of service interruption. Assess its impact carefully and perform it during off-peak hours.

Procedure

Click the name of the target TR instance.

In the area under Basic information, select the Intra-region attachments tab.

Click the switch in the Auto Publish Route column of the target network instance attachment.

Click Enable to complete the action.

Disable auto publishing

Instructions

If you disable auto publishing, the system automatically deletes the route entries published from TR to VPC. This may affect communication between the VPC and other networks. Proceed with caution.

Auto publishing for a cross-account VPC attachment can only be disabled by the VPC owner. The TR owner cannot perform this action.

Procedure

Click the name of the target TR instance.

In the area under Basic information, select the Intra-region attachments tab.

Click the switch in the Auto Publish Route column of the target network instance attachment.

Click Disable to complete the action.