Track new and updated CEN features with links to detailed documentation.
May 2026
|
Feature |
Change type |
Description |
Release date |
Documentation |
|
Priority scheduling QoS |
New |
Transit Router (TR) introduces a hybrid QoS scheduling mechanism on cross-region connections that combines strict priority preemption and weighted fair sharing. This feature lets you assign different link qualities to various business services. |
2026-05-19 |
|
|
Policy-based routing |
New |
Policy-based routing (PBR) applies policies to traffic entering an attachment, matching on source IP, destination IP, protocol, port, or DSCP and forwarding matched traffic to a specified route table. |
2026-05-19 |
February 2026
|
Feature |
Type |
Description |
Release date |
References |
|
TR enables seamless payer changes for network instances. |
New |
For cross-account network instances connected to TR, you can change the payer for TR connection and traffic fees without disrupting traffic. |
2026-02-03 |
November 2025
|
Feature |
Type |
Description |
Release date |
References |
|
TR flow log delivery to the NIS traffic analyzer |
New |
TR flow logs can now be delivered 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 and minimizes network jitter. |
2025-11-11 |
Transit router resource reservation To use this feature, contact your account manager for access. |
October 2025
|
Feature |
Type |
Description |
Release date |
References |
|
TR route table limit raised to 50 |
Enhancement |
Each Transit Router now supports up to 50 route tables. |
2025-10-14 |
August 2025
|
Feature |
Type |
Description |
Release date |
References |
|
MED |
New |
ECR route entries now support the MED attribute. When you connect TRs from multiple regions to an ECR, you can set a default MED value on the ECR for a specific TR to designate a preferred path and prevent suboptimal traffic detours. Important
To enable this feature for an existing ECR connected to TRs from multiple regions, contact Alibaba Cloud. |
2025-08-19 |
November 2024
|
Feature |
Type |
Description |
Release date |
References |
|
Flow logs |
Update |
Flow logs can now capture traffic data across Enterprise Edition transit router instances, VPC connections, VPN connections, and ECR connections. |
2024-11-14 |
|
|
VPN connections in dual-tunnel mode |
Update |
VPN connections now support dual-tunnel mode. Each IPsec-VPN connection includes two tunnels forming an ECMP link. If one tunnel fails, traffic automatically fails over to the other. In multi-AZ regions, tunnels are deployed across availability zones for zone-level disaster recovery. |
2024-11-26 |
October 2024
|
Feature name |
Change type |
Description |
Release date |
Related documents |
|
IGMP |
New |
Transit Router now supports IGMP (Internet Group Management Protocol). IGMP dynamically adds and removes multicast sources and members, eliminating manual configuration when managing multicast networks across multiple VPCs. |
2024-10-11 |
September 2024
|
Feature |
Change type |
Description |
Release date |
References |
|
IPv6 |
New feature |
Enterprise Edition transit routers forward IPv6 traffic and learn IPv6 routes by default. Connect your VPC, ECR, and VBR instances to an Enterprise Edition transit router to enable same-region and cross-region IPv6 communication among VPCs and on-premises networks. |
2024-09-10 |
July 2024
|
Feature |
Type |
Description |
Release date |
References |
|
Monitor CEN resources |
Update |
|
2024-07-02 |
June 2024
|
Feature |
Type |
Description |
Release date |
References |
|
Route quota for Enterprise Edition transit routers |
Update |
Each Enterprise Edition TR route table now supports up to 10,000 routes. Each Enterprise Edition TR supports up to 40,000 routes across all its route tables. |
2024-06-25 |
February 2024
|
Feature |
Type |
Description |
Release date |
References |
|
ECR connection |
New |
You can connect an ECR instance to an Enterprise Edition transit router, allowing the associated on-premises data center to communicate with other networks. |
2024-02-21 |
December 2023
|
Feature |
Type |
Description |
Release date |
References |
|
Line type |
New |
Inter-region connections now support two new line types: Platinum and Gold. Gold suits traffic that is not sensitive to link quality, such as data synchronization and migration. Platinum targets traffic that is highly sensitive to network jitter and latency, such as securities trading, real-time voice, and video conferencing. |
2023-12-06 |
September 2023
|
Feature |
Type |
Description |
Release date |
References |
|
Transit router savings plan |
New |
Transit router savings plans offer discounts on data transfer fees in exchange for a spending commitment over a set period. The plan automatically applies to Enterprise Edition TR data transfer fees. |
2023-09-04 |
May 2023
|
Feature |
Type |
Description |
Release date |
References |
|
Quick configuration for traffic marking policies |
Update |
You can now quickly add traffic classification rules while configuring a traffic marking policy. |
2023-05-17 |
March 2023
|
Feature |
Type |
Description |
Release date |
References |
|
Route synchronization |
New |
Route synchronization lets you control which routes an Enterprise Edition transit router advertises from its route tables to connected network instances. |
2023-03-30 |
|
|
Aggregate route |
New |
Enterprise Edition transit routers now support aggregate routes. You can summarize multiple routes with similar destination CIDR blocks and the same next hop into a single aggregate route. With route synchronization enabled, the TR advertises only the aggregate route, not the more specific routes it contains, simplifying VPC route tables. |
2023-03-30 |
|
|
Transit router diagnostics |
New |
CEN integrates with NIS to provide TR diagnostics. You can diagnose TR instances, identify issues, and receive repair suggestions. |
2023-03-22 |
|
|
Reachability Analyzer |
New |
CEN now offers the Reachability Analyzer through NIS integration, enabling you to diagnose network connectivity between resources. |
2023-03-22 |
|
|
Transit router monitoring |
New |
CEN integrates with CloudMonitor for TR monitoring. You can view monitoring data, create threshold-based alert rules, and receive notifications when anomalies are detected. |
2023-03-17 |
|
|
Multi-region VBR ECMP routing |
New |
By default, an Enterprise Edition transit router selects a single path based on the alphabetically first region ID when it learns routes to the same destination from different VBRs. With multi-region VBR ECMP enabled, these routes form an ECMP group for concurrent forwarding. |
2023-03-15 |
November 2022
|
Feature |
Type |
Description |
Release date |
References |
|
Transit router CIDR block |
New |
You can now define a custom CIDR block for a transit router, similar to a loopback interface address range. The TR uses this CIDR block to assign IP addresses to 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, enabling you to link on-premises data centers to a TR for communication with other networks. |
2022-08-05 |
|
|
Prefix lists |
New |
You can now associate an Enterprise Edition TR route table with a VPC prefix list. The system automatically adds all CIDR blocks from the prefix list to the route table. |
2022-08-04 |
June 2022
|
Feature |
Type |
Description |
Release date |
References |
|
Flow logs |
New |
Flow logs can now capture traffic information over VBR connections. |
2022-06-17 |
|
|
Multicast |
New |
Enterprise Edition transit routers now support multicast. After connecting network instances to a TR, you can create and manage multicast networks. The TR forwards multicast traffic between connected instances. |
2022-06-07 |
May 2022
|
Feature |
Type |
Description |
Release date |
References |
|
VPC connection |
Optimization |
CEN has optimized the VPC connection model for Enterprise Edition transit routers. Enterprise Edition TRs now forward traffic from connected VPCs over the shortest path. |
2022-05-31 |
Announcement: Optimization of the VPC Connection Model for Enterprise Edition Transit Routers |
December 2021
|
Feature |
Type |
Description |
Release date |
References |
|
Payer account billing |
New |
When connecting an Enterprise Edition TR to a cross-account VPC or VBR, you can bill connection and data transfer fees to either the TR owner or the network instance owner. |
2021-12-24 |
Grant permissions on a network instance that belongs to another account |
November 2021
|
Feature |
Type |
Description |
Release date |
References |
|
Flow logs |
New |
Flow logs can now capture inter-region traffic between TRs, enabling traffic analysis, error troubleshooting, and data transfer cost optimization. |
2021-11-08 |
April 2021
|
Feature |
Type |
Description |
Release date |
References |
|
QoS policy |
New |
QoS policies let you mark traffic and apply bandwidth limits per service, preventing non-critical services from consuming bandwidth needed by core services. |
2021-04-30 |
|
|
CCN bandwidth multiplexing |
New |
CCN now supports bandwidth multiplexing. A CCN transit router and a regional transit router in the same region can share inter-region bandwidth in real time, improving 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 and routing management features including custom route tables, route entries, and routing policies for building flexible, interconnected cloud networks. |
2021-02-20 |
|
|
transit router |
New |
A transit router is a core forwarding component that connects network instances within and across regions, enabling communication among all network resources. |
2021-02-20 |
|
|
Console |
New |
The console introduces the transit router for connecting network instances within and across regions, with enhanced routing capabilities for building enterprise-grade global networks. |
2021-02-20 |
May 2019
|
Feature |
Type |
Description |
Release date |
References |
|
PrivateZone |
New |
PrivateZone provides private DNS resolution and management for VPCs. CCN and VBR instances attached to a CEN instance can also access the service. |
2019-05-16 |
October 2018
|
Feature |
Type |
Description |
Release date |
References |
|
Overlapping route |
New |
When the overlapping route feature is enabled, CEN can learn routes with the same prefix but different mask lengths, increasing network flexibility. |
2018-10-12 |
This feature is enabled by default in the console and cannot be disabled. |
|
Delete health check |
New |
CEN now allows you to delete health check configurations. |
2018-10-12 |
|
|
Alert rules |
New |
The CEN console now provides a shortcut to CloudMonitor for creating alert rules on network resources. |
2018-10-12 |
|
|
Detach network instance |
New |
CEN now allows you to detach network instances, such as VPC, VBR, and CCN instances, from a CEN instance. |
2018-10-12 |
|
|
Attach a cross-account CCN instance |
New |
CEN now allows you to attach a cross-account CCN instance to connect to your on-premises network. |
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 |
|
Advertise routes to CEN |
New |
You can advertise routes from a VPC instance to CEN in the CEN console. |
2018-07-30 |