Cloud Enterprise Network:What is CEN?

Component

Description

CEN instance

CEN instances are the basic resources that are used to create and manage cloud networks. Transit routers are deployed on CEN instances.

A CEN instance can contain one or more transit routers. You can purchase bandwidth plans and create inter-region connections on transit routers to enable communication between network instances in different regions.

Transit router

Transit routers are the core network element that forwards network traffic within or across regions. Transit routers are region-specific and support custom routing policies. For a CEN instance, you can create only one transit router in each region.

Network instance

Network instance attachment

Transit router route table

Network instances that are connected through a transit router forward traffic by using the route tables of the transit router. Each transit router has a default route table. You can create custom route tables and configure communication, isolation, and traffic redirection policies by using the associated forwarding and route learning features.

• Default route table

  The system automatically creates a default route table for each transit router.

• Custom route table

  You can manually create custom route tables. Custom route tables are similar to virtual routing and forwarding (VRF) used by traditional routers. A custom route table is isolated from the default route table and other custom route tables.

• Associated forwarding

  You can create an associated forwarding correlation between a network instance attachment and a route table of a transit router. After you enable associated forwarding, the transit router forwards traffic based on the route table that is associated with the network instance.

• Route learning

  You can enable route learning between a network instance attachment and a route table of a transit router. After you create a route learning correlation, the route table can automatically learn routes from the network instance.

Bandwidth plan

A bandwidth plan provides bandwidth resources to enable inter-region communication. You can purchase bandwidth plans and create inter-region connections on transit routers to enable communication between network instances in different regions. For more information, see Work with a bandwidth plan.

Worldwide Network Communication

Low Latency and High Speed

High Reliability and High Quality

You can use transit routers and bandwidth plans to connect VPCs in different regions to data centers. This allows networks to communicate on a global scale. Each Enterprise Edition transit router supports up to 1,000 VPCs that are deployed in the same region. You can expand your network by adding VPCs.

CEN provides low-latency and high-speed network transmission. In the same region, the data transfer rate can reach the maximum rate supported by the device port. Resources can communicate with each other on a global scale. Compared with data transmission over the Internet, network latency is greatly reduced.

Transit routers can be deployed in active/standby mode. Network traffic is automatically switched between the active and standby transit routers to ensure service availability. Multiple sets of high-quality connections exist between any two nodes in the network established by CEN. When Layer 2 connections are interrupted, the network automatically converges to prevent your workloads from being interrupted.

Secure and Flexible Enterprise-class Networking

Convenience with Pay-As-You-Go

One-stop O&M

Transit routers support custom routing policies to meet the requirements for enterprise-class networking. For example, you can create a network topology that supports security zones, demilitarized zones, and service chaining.

Transit routers support the pay-as-you-go billing method. For network communication within the same region, you are charged only for the connected network instances and data transfer processed by the transit routers. You can also create inter-region connections without device or ISP line deployment, and adjust connection settings as needed. This reduces networking costs.

The CEN console displays your network resources in different regions. You can query intra-region and inter-region network typologies and check network status in the console. The CEN console supports visualized management that improves O&M efficiency.