Transit routers are core components of Cloud Enterprise Network (CEN). Transit routers provide multiple network communication and route management features. For example, you can use transit routers to connect network instances, create custom route tables, add route entries, and add route maps. This topic describes the features supported by transit routers.
Transit routers and related resources
A CEN instance creates a transit router instance in each region. Each transit router instance represents a transit router. You can use a transit router to connect network instances deployed in the current region to network instances that are deployed in the same region or different regions. Transit routers support intra-region route tables, route maps, and cross-region connections to meet your business requirements.
The following content describes the related resources when you use a transit router.
|CEN instances||A CEN instance represents a network that covers one or multiple regions.
Each CEN instance contains two or more transit routers. You can purchase bandwidth plans to allow transit routers in different regions to communicate with each other. This builds a cross-region network.
|Transit router instances||Each transit router instance represents a transit router.
You can create a transit router for a CEN instance in each region.
|Transit router connections||Transit router connections refer to the connections between transit routers and network
instances. You can create a connection between a transit router and a network instance
that are deployed in the same or different regions.
|Route tables of a transit router||Network instances that are attached to a CEN instance forward traffic by querying
the route tables of the transit router in the current region.
Each transit router has a default route table. You can also create custom route tables for each transit router.
The default route table of a transit router is isolated from its custom route tables.
Transit routers provide multiple network communication and route management features. For example, you can use transit routers to connect network instances, create custom route tables, add route entries, and add route maps.
Transit routers are provided with two editions based on regions: the basic edition and the enterprise edition. Basic Edition transit routers and Enterprise Edition transit routers have different features. For more information, see the following table. For more information about the regions that support Enterprise Edition transit routers, see Regions and zones that support Enterprise Edition transit routers.
|Feature type||Feature||Basic Edition||Enterprise Edition||References|
|Basic features||Create transit router instances||Not supported
When you create a transit router connection in a region, the system automatically creates a transit router instance in the region. You cannot manually create transit router instances.
|Supported||Create a transit router|
|Create transit router connections||Supported||Supported|
|Routing||Create custom route tables||Not supported
Each Basic Edition transit router has only one default route table. All network instances that are associated with the transit router forward traffic by querying the default route table.
|Add route entries||Not supported||Supported|
|Configure associated forwarding||Not supported||Supported|
|Configure route learning||Not supported||Supported|
|Add route maps||Supported||Supported|
|Cloud services||Configure access to cloud services||Supported||Supported||Enable access to cloud services|
|Configure PrivateZone||Supported||Supported||Configure PrivateZone|
Regions and zones that support Enterprise Edition transit routers
Transit routers are provided with two editions based on regions: the basic edition and the enterprise edition. The following table describes the regions and zones that support Enterprise Edition transit routers. By default, regions and zones that are not included in the following table support Basic Edition transit routers.
|Mainland China||China (Hangzhou)||Zone H and Zone I|
|China (Shenzhen)||Zone D and Zone E|
|China (Beijing)||Zone H and Zone G|
|China (Shanghai)||Zone F and Zone G|
|Asia Pacific||Singapore (Singapore)||Zone B and Zone C|
|China (Hong Kong)||Zone B and Zone C|
|North America||US (Virginia)||Zone A and Zone B|
|US (Silicon Valley)||Zone A and Zone B|