This topic highlights new CEN features and provides links to related documentation.
February 2026
Feature name | Change type | Description | Release date | Related documentation |
Seamless payer change for cross-account network instances | New | For cross-account network instances, you can change the payer for TR connection and traffic fees without disrupting traffic. | 2026-02-03 |
November 2025
Feature | Change type | Description | Release date | Related documentation |
TR flow log delivery to the NIS traffic analyzer | New | You can now send flow logs from a transit router (TR) to the NIS traffic analyzer. | 2025-11-25 | |
Resource reservation for transit routers | New | In latency-sensitive scenarios, resource reservation for transit routers (TRs) reduces communication latency between TRs and ECS instances and minimizes network jitter. | 2025-11-11 | Resource reservation for transit routers To enable this feature, contact your account manager. |
October 2025
Feature | Type | Description | Release date | Related documents |
TR route table limit increased to 50 | Enhancement | Each Transit Router now supports up to 50 route tables. | 2025-10-14 |
August 2025
Feature name | Change type | Description | Release date | References |
MED | New | ECR route entries now support the MED attribute. When TRs from multiple regions are connected to an ECR, you can set a default MED value on the ECR for a specific TR. This setting lets you designate a preferred path to prevent suboptimal traffic detours between the TRs. Important To enable this feature for pre-existing network environments where TRs from multiple regions connect to an ECR, contact Alibaba Cloud. | 2025-08-19 |
November 2024
Feature | Change type | Description | Release date | Related documents |
Flow logs | Improvement | Flow logs now capture traffic for Enterprise Edition Transit Router instances, VPC connections, VPN connections, and VBR connections. | 2024-11-14 | |
Dual-tunnel mode for VPN connections | Improvement | VPN connections now use dual-tunnel mode. Each IPsec-VPN connection consists of two tunnels that automatically form an Equal-Cost Multipath Routing (ECMP) link. If one tunnel fails, traffic is automatically routed through the other, ensuring high availability for the IPsec-VPN connection. In regions with multiple availability zones, the two tunnels are distributed across different availability zones, providing zone-level disaster recovery. | 2024-11-26 |
October 2024
Feature | Change type | Description | Release date | Related documentation |
IGMP | New | Transit Router now supports Internet Group Management Protocol (IGMP). When you establish a multicast network using a Transit Router, you no longer need to manually specify multicast sources and members. The Transit Router dynamically adds and removes them based on IGMP. This lets you quickly add resources in multiple VPCs to the multicast network or remove them, improving management and deployment efficiency. | 2024-10-11 |
September 2024
Feature name | Change type | Description | Release date | Related documentation |
IPv6 | New | Enterprise Edition Transit Router instances now forward IPv6 traffic and can learn and propagate IPv6 routes by default. To enable IPv6 communication between Virtual Private Cloud (VPC) instances or between cloud and on-premises environments, connect your VPC, Express Connect Router (ECR), and Virtual Border Router (VBR) instances to an Enterprise Edition Transit Router. This connection enables intra-region and cross-region IPv6 communication among the connected VPCs and the local networks of the ECR and VBR instances. | 2024-09-10 |
July 2024
Feature name | Change type | Description | Release date | Related documentation |
Monitor CEN resources | Enhancement |
| 2024-07-02 |
June 2024
Feature name | Change type | Description | Release date | Related documentation |
Route quota for Enterprise Edition Transit Router | Optimization | An Enterprise Edition Transit Router now supports up to 10,000 routes per route table. An Enterprise Edition Transit Router instance supports a maximum of 40,000 routes across all its route tables. | 2024-06-25 |
February 2024
Feature name | Change type | Description | Release date | Related documentation |
ECR connection | New | You can now connect an Express Connect Router (ECR) instance to an Enterprise Edition Transit Router. This connection enables the associated data center to communicate with other networks through the Enterprise Edition Transit Router. | 2024-02-21 |
December 2023
Feature | Change type | Description | Date | Documentation |
Line types | New | Inter-region connections now support Platinum and Gold line types. The Gold line type is ideal for less network-sensitive workloads, such as data synchronization and data migration. The Platinum line type is better suited for workloads that are highly sensitive to network jitter and latency, such as securities trading, online voice, and video conferencing. | 2023-12-06 |
September 2023
Feature | Type | Description | Release date | References |
Transit Router Savings Plan | New | A Transit Router Savings Plan is a discount plan that offers lower data transfer fees in exchange for a spending commitment over a fixed term. Once active, the plan automatically offsets the data transfer fees for Enterprise Edition Transit Routers. | 2023-09-04 |
May 2023
Feature | Type | Description | Release date | References |
Quick configuration of traffic marking policies | Enhancement | You can now quickly add traffic classification rules when configuring a traffic marking policy. | 2023-05-17 |
March 2023
Feature | Type | Description | Release date | References |
route synchronization | New | Route synchronization lets you control how an Enterprise Edition transit router propagates routes from its route tables to attached network instances. | 2023-03-30 | |
aggregate route | New | Enterprise Edition transit routers now support aggregate routes. You can combine multiple routes with similar destination CIDR blocks and the same next hop into a single aggregate route. When route synchronization is enabled for a VPC, the transit router propagates only the aggregate route, not the more specific routes. This reduces route entries in the VPC's route table and improves routing efficiency. | 2023-03-30 | |
transit router diagnostics | New | CEN integrates with Network Intelligence Service (NIS) to provide transit router diagnostics. This feature lets you diagnose transit router instances, identify issues, and receive resolution recommendations to independently troubleshoot related network problems. | 2023-03-22 | |
reachability analyzer | New | CEN now integrates with Network Intelligence Service (NIS) to support the reachability analyzer. The reachability analyzer lets you diagnose network connectivity between your resources. | 2023-03-22 | |
Monitor transit router instances | New | The integration with CloudMonitor lets you view monitoring data for your transit router instances and create threshold-based alerts for traffic anomalies. | 2023-03-17 | |
multi-region ECMP routing for VBRs | New | By default, when an Enterprise Edition transit router learns routes to the same destination CIDR block from multiple VBRs, it prioritizes the route from the region whose ID comes first alphabetically, assuming all other route attributes are identical. You can now enable multi-region ECMP routing for VBRs. When enabled, these routes form an ECMP group that load-balances traffic across them. | 2023-03-15 |
November 2022
Feature | Type | Description | Release date | References |
Transit router CIDR block | New | A transit router CIDR block is a custom CIDR block that you can assign to a transit router. It functions similarly to the CIDR block assigned to a router's loopback interface. The transit router uses this CIDR block to allocate IP addresses for IPsec connections and Connect Peers. | 2022-11-22 |
August 2022
Feature | Type | Description | Release date | References |
IPsec-VPN connections | New | Enterprise Edition transit routers now support IPsec-VPN connections, which allow on-premises data centers to connect directly to a transit router to communicate with other networks. | 2022-08-05 | |
Prefix lists | New | When you associate a prefix list from a VPC with the route table of an Enterprise Edition transit router, the system automatically adds routes for all CIDR blocks in the prefix list to the transit router's route table. | 2022-08-04 |
June 2022
Feature | Type | Description | Release date | References |
Flow logs | New | Flow logs can now capture traffic from VBR connections. | 2022-06-17 | |
Multicast | New | Transit Router (Enterprise Edition) now supports multicast. After you attach network instances to a Transit Router (Enterprise Edition), you can create and manage multicast networks. The Transit Router forwards multicast traffic between the network instances. | 2022-06-07 |
May 2022
Feature | Type | Description | Release date | References |
VPC connections | Optimization | CEN has optimized VPC connections for Enterprise Edition transit routers. This update enables shortest path forwarding for traffic between the routers and connected VPC instances. | 2022-05-31 | Announcement: Optimization of VPC Connections for Enterprise Edition Transit Routers |
December 2021
Feature | Type | Description | Release date | References |
billing by payer account | New | When an Enterprise Edition transit router connects to a cross-account VPC or VBR, the connection fee and data transfer fee can be charged to either the Alibaba Cloud account that owns the Enterprise Edition transit router or the one that owns the network instance. | 2021-12-24 |
November 2021
Feature | Type | Description | Release date | References |
Flow logs | New | Flow logs now capture information about inter-region traffic between Transit Routers. Use this data to analyze inter-region traffic patterns, troubleshoot network issues, and optimize data transfer costs. | 2021-11-08 |
April 2021
Feature | Type | Description | Release date | References |
quality of service (QoS) policy | New | A quality of service (QoS) policy lets you mark traffic from different services and apply bandwidth throttling. This prevents non-core services from consuming the bandwidth of core services, which ensures sufficient bandwidth for your key operations and improves overall network efficiency. | 2021-04-30 | |
CCN bandwidth multiplexing | New | With CCN bandwidth multiplexing, a CCN transit router and a regional transit router in the same region can share inter-region bandwidth in real time. This eliminates the need for manual configuration adjustments and increases bandwidth flexibility. | 2021-04-30 |
February 2021
Feature | Type | Description | Release date | References |
Enterprise Edition transit router | New | The Enterprise Edition transit router provides extensive network interconnection and route management capabilities, such as custom route tables, route entries, and routing policies to help you build flexible and interconnected cloud networks. | 2021-02-20 | |
Transit router | New | A transit router is a regional network hub that connects network instances within and across regions, enabling communication throughout your entire network. | 2021-02-20 | |
CEN console | New | The CEN console includes all features from the previous version and uses transit routers to connect network instances within and across regions. It also provides enhanced routing features to help you build a flexible, reliable, and scalable enterprise-grade global network. | 2021-02-20 |
May 2019
Feature | Type | Description | Release date | References |
PrivateZone | New | PrivateZone provides private domain name resolution and management within a VPC. CCN and VBR instances attached to a CEN can access PrivateZone over CEN. | 2019-05-16 |
October 2018
Feature | Type | Description | Release date | References |
Overlapping routing | New | CEN can now learn routes with the same prefix but different mask lengths, improving network flexibility. | 2018-10-12 | This feature is enabled by default in the console and cannot be disabled. |
Delete health check configurations | New | CEN now supports deleting health check configurations. | 2018-10-12 | |
Alert rules | New | The CEN console now provides a shortcut to CloudMonitor, allowing you to quickly set alert rules for your network resources and improve operational efficiency. | 2018-10-12 | |
Detach network instances | New | CEN now supports detaching network instances, including VPC, VBR, and CCN instances. | 2018-10-12 | |
Attach cross-account CCN instances | New | CEN now supports attaching cross-account CCN instances to connect your on-premises networks. | 2018-10-12 | Grant permissions on a network instance that belongs to another account and Associate a CCN instance with a transit router |
July 2018
Feature | Type | Description | Release date | References |
Route advertising | New | You can now advertise VPC routes to CEN via the CEN console. | 2018-07-30 |