Cloud Enterprise Network (CEN) is a highly-available network built on the global private network of Alibaba Cloud, which offers high performance with low latency.

CEN can implement network communication in the same region or across regions by establishing private connections between virtual private clouds (VPCs) or between VPCs and data centers. In addition, CEN supports custom communication, isolation, and redirect policies within a region. This allows you to establish a global enterprise-class private network that is also flexible, reliable, and large-scale.

Transit routers introduction

Components

CEN consists of the following components:

  • CEN instances

    CEN instances are basic network resources that you can use to create and manage your networks.

    The network instances attached to a CEN instance can belong to one or more regions. After you create a CEN instance, you can attach network instances to the CEN instance. To connect the network instances, you must purchase a bandwidth plan and set cross-region bandwidth. This way, network resources deployed in different regions can communicate with each other.

  • Transit router instances

    Transit routers are core components of CEN. 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 other network instances deployed in the same region or other regions. This way, the network instances can communicate with each other. Transit routers support regional route tables, route maps, and cross-region connections. You can also use transit routers to create custom traffic communication, isolation, and redirect policies to meet your business requirements.

    A transit router consists of the following two components:
    • Transit router connections

      Transit router connections refer to the connections between a transit router and related networks, including VPCs, virtual border routers (VBRs), and Cloud Connect Network (CCN) instances. You can also use transit routers to establish cross-region connections.

    • 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. A transit router has a default route table. You can create custom route tables and custom communication, isolation, and isolation policies to meet your business requirements.

    Transit routers provide the Basic edition and Enterprise edition based on the specified region. The Basic edition and Enterprise edition provide different features. For more information, see Transit routers.

  • Bandwidth plans

    You do not need to purchase a bandwidth plan when you connect network instances that are deployed in the same region. To connect network instances deployed in different regions, you must purchase a bandwidth plan for the regions to be connected and set cross-region bandwidth. Each area contains one or more Alibaba Cloud regions. You can view the areas that can be connected in the CEN console.

    For example, if you want to connect network instances deployed in the China (Beijing) region and in the China (Hangzhou) region, you must purchase a bandwidth plan and select mainland China and mainland China as connected areas. Then, set cross-region bandwidth between the China (Beijing) region and the China (Hangzhou) region.

    Note By default, CEN provides bandwidth of 1 Kbit/s for you to test network connectivity. To ensure that your workloads run as expected, purchase a bandwidth plan and set cross-region bandwidth.
    The following table describes the correlation between regions and areas.
    Area Region
    Mainland China China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Hangzhou), China (Shanghai), and China (Chengdu)
    North America US (Silicon Valley) and US (Virginia)
    Asia Pacific China (Hong Kong), Singapore (Singapore), Malaysia (Kuala Lumpur), Japan (Tokyo), Indonesia (Jakarta), and India (Mumbai)
    Europe Germany (Frankfurt) and UK (London)
    Australia Australia (Sydney)

About network transmission

Alibaba Cloud offers a private network with high performance and low latency. This private network provides a secure cloud computing environment to meet your networking needs. Packet loss during network transmission may be caused by many factors. These factors include network stream collisions, Layer 2 network errors, and other network malfunctions. Alibaba Cloud optimizes and maintains its transmission network to ensure a 99th percentile (P99) of per-hour packet loss lower than 0.0001% in cross-region data transmission.

When you use CEN, take note of the following items:

  • Only network traffic transmitted over CEN passes through the Alibaba Cloud transmission network. CEN can minimize packet loss in cross-region data transmission when you have purchased sufficient bandwidth resources.
  • The leased lines that connect mainland China to regions outside mainland China are provided by China Unicom. These leased lines are optimized and maintained in the same way as the Alibaba Cloud transmission network to minimize packet loss.